CN102718438B - Bridge floor seamless expansion joint material with large expansion amount and preparation method thereof - Google Patents

Abstract

The invention relates to a bridge seamless expansion joint material and its preparation. A bridge deck seamless expansion joint material with a large amount of expansion is characterized in that it is prepared from 1# mineral material, 2# mineral material, rubber particles, mineral powder filler and cementing material, and the mass percentage of each raw material is: 1# mineral material 60.0%～70.0%, 2# mineral material 4.0%～14.0%, rubber particles 4.0%～8.5%, mineral powder filler 4.0%～7.0%, cementing material 9.0%～17.5%; The components and their mass percentages are: base asphalt 65.0-75.0%, rubber powder 20.0%-25.0%, SBS modifier 5.0-10.0%. It is characterized by greater deformation ability at low temperature without cracking, and better anti-rutting ability at high temperature. The large expansion capacity bridge deck seamless expansion joint material prepared by the above method has a expansion capacity of ≥ 50mm, which breaks through the expansion and displacement limitation of conventional seamless expansion joints, and can be popularized and applied in medium-span bridges.

Description

A large amount of expansion bridge deck seamless expansion joint material and its preparation method

technical field

The invention belongs to the field of road building materials and engineering, in particular to a bridge deck seamless expansion joint material and its preparation.

technical background

Expansion joints are a very important part of the bridge structure. Its main function is to adapt to the deformation caused by temperature and humidity changes, concrete shrinkage and creep, bridge pier settlement and beam end rotation, etc., and to ensure smooth bridge deck and traffic comfortable. Compared with other types of bridge deck seamless expansion joints, seamless expansion joints can provide a complete surface for concrete bridge structures, resist damage to the structure by water or harmful components, and can adapt to shrinkage caused by temperature, with good performance Integrity, durability, waterproof and drainage performance, easy maintenance and repair, low noise and other advantages, and are widely used at home and abroad.

The key to the service performance of bridge deck seamless expansion joints lies in the performance of the mixture, and the performance of the mixture is composed of special asphalt binder and aggregate. Low-temperature cracking, high-temperature passage, and insufficient bonding with the original pavement structure are typical defects of seamless expansion joint materials. Some expansion joint materials have been independently developed in China, but compared with imported materials, the actual use effect is not ideal, so the domestic seamless expansion joint material market is more dependent on imported products. At present, the technical problem faced by seamless expansion joint materials is that the amount of expansion is small, which is only suitable for small-span bridges, and the scope of use is limited. In addition, under the extreme low temperature conditions in the alpine region, the adaptability of the seamless expansion joint material is poor, and a greater breakthrough is required in the low temperature performance and expansion capacity of the material.

Asphalt materials are commonly used cementing materials for seamless expansion joints, but the main problems they face are low-temperature brittleness and insufficient high-temperature stability, which must be highly modified to obtain elastomeric materials with excellent performance. Petroleum asphalt is difficult to meet the requirements. Since the seamless expansion joint filling material is rich in asphalt materials, its low-temperature elongation deformation and high-temperature traffic bearing capacity depend on the performance of asphalt binder, which puts forward higher requirements for the low-temperature and high-temperature compatibility of asphalt materials.

The filling material of traditional seamless expansion joints is mainly composed of asphalt binder and stone. Compared with cementing material, stone is a rigid material, which only acts as a filler and does not participate in the overall deformation of the filling material. In addition, the proportion of stone used is higher than that of asphalt cement, which makes the expansion and contraction of the seamless expansion device Depends entirely on the properties of the binder. In order to prepare seamless expansion joint materials with a large amount of expansion and contraction, it is necessary to break through the limitations of the existing filling materials in terms of composition, and focus on solving the problem that the filling materials do not participate in the deformation energy, so that the components of each material can be deformed synergistically to adapt to the complex deformation of the bridge.

my country's traffic and environmental conditions are harsh, and seamless expansion joint materials are prone to rutting at high temperatures, excess adhesive causes flow, cracking at low temperatures, and bond failure with the original road surface.

Contents of the invention

The object of the present invention is to provide a bridge deck seamless expansion joint material with a large amount of expansion and its preparation method. The bridge deck seamless expansion joint material prepared by the method has good high temperature stability and excellent low temperature crack resistance.

In order to achieve the above object, the technical solution adopted in the present invention is: a kind of seamless expansion joint material for bridge deck with large amount of expansion, characterized in that it consists of 1# mineral material, 2# mineral material, rubber particles, mineral powder filler and The mass percentage of each raw material is: 1# mineral material 60.0%～70.0%, 2# mineral material 4.0%～14.0%, rubber particles 4.0%～8.5%, mineral powder filler 4.0%～7.0% , cementing material 9.0% ~ 17.5%;

Among them, the particle size of 1# mineral material is 4.75mm～9.5mm (excluding 4.75mm, that is, the particle size of 1# mineral material is >4.75mm and ≤9.5mm), the particle size of 2# mineral material is ≤4.75mm, rubber Particle size ≤ 4.75mm (0.3mm ~ 4.75mm);

The components of the cementitious material and their mass percentages are: base asphalt 65.0-75.0%, rubber powder 20.0%-25.0%, SBS modifier 5.0-10.0%.

The mineral material (1# mineral material, 2# mineral material) is basalt, limestone or andesite, etc. (1# mineral material, 2# mineral material can be basalt, limestone, andesite, etc.), and has sufficient strength (compression Broken value ≤ 20%), and strictly control the needle flakes in the aggregate (needle flake content ≤ 10%).

Mineral powder filler (mineral powder) is limestone mineral powder, particle size ≤ 0.075mm.

The base asphalt is high-grade road petroleum asphalt, the penetration range is 80-120, the softening point is not lower than 41°C, and the ductility at 15°C is not less than 100cm, such as 90# road petroleum asphalt, 110# road petroleum asphalt or 130# road Petroleum asphalt; the particle size of rubber powder is 60 mesh to 200 mesh, and it is produced by crushing at room temperature (it can be crushed from waste tires at normal temperature); the SBS modifier is a star-shaped SBS modifier (full name is styrene-butylene). Diene-styrene triblock copolymer, or liquid star SBS asphalt modifier).

The present invention is characterized in that: the cement used is compounded and modified by matrix asphalt, rubber powder and SBS modifier, and the rubber particles are used to replace part of the mineral materials.

A method for preparing a bridge deck seamless expansion joint material with a large amount of expansion, is characterized in that it comprises the following steps:

1) Preparation of binder:

①According to each component and its mass percentage: base asphalt 65.0-75.0%, rubber powder 20.0%-25.0%, SBS modifier 5.0-10.0%, select base asphalt, rubber powder and SBS modifier;

②First, heat the base asphalt to a temperature of 140-150°C and add it to the container. When the temperature rises to a set temperature of 180-220°C, add rubber powder and SBS modifier to the container containing the base asphalt , stir with a low-speed mixer while heating, and the stirring speed is controlled within the range of 100r/min to 400r/min;

③ When the rubber powder starts to swell, the viscosity rises, and the stirring is difficult, slow down the adding speed of the SBS modifier and continue stirring;

④Repeat the operation of step ③ until all the SBS modifier is added, then increase the speed of the low-speed mixer and maintain it at 400r/min~750r/min until the ingredients are basically uniform;

⑤ Use a high-speed shearing mixer for stirring, the speed of the shearing rotor is 3000r/min-5000r/min, and the temperature is controlled within the range of 180°C-220°C, and the stirring time is 60min to obtain the cementitious material;

2) According to 60.0%～70.0% of 1# mineral material, 4.0%～14.0% of 2# mineral material, 4.0%～8.5% of rubber particle, 4.0%～7.0% of mineral powder filler, 9.0%～17.5% of cementing material, select 1 # Mineral material, 2# mineral material, rubber particles, mineral powder filler and cementing material;

Among them, the particle size of 1# mineral material is 4.75mm～9.5mm (excluding 4.75mm, that is, the particle size of 1# mineral material is >4.75mm and ≤9.5mm), the particle size of 2# mineral material is ≤4.75mm, rubber Particle size ≤ 4.75mm (0.3mm ~ 4.75mm);

The mineral material (1# mineral material, 2# mineral material) is basalt, limestone or andesite, etc. (1# mineral material, 2# mineral material can be basalt, limestone, andesite, etc.), and has sufficient strength (compression crushing value≤20%), and strictly control the needle flakes in the aggregate (needle flake content≤10%); the mineral powder filler (mineral powder) is limestone mineral powder, particle size ≤0.075mm;

3) Pouring:

① Heat 1# ore and 2# to 280±20°C, pour them into a mixing pot with a temperature of 220°C, then pour rubber particles at room temperature into the mixing pot, and pre-stir for 90s;

②Pour the cement at 200°C into the mixing pot and stir for 90s;

③Finally, add mineral powder filler (or called mineral powder) into the mixing pot and stir for 90 seconds to obtain the seamless expansion joint material of the bridge deck with a large amount of expansion, and then cast (directly pour into the mold, just level the surface, without rolling ).

Rubber granules can also be crushed from waste tires at normal temperature and used to replace part of the mineral materials in the gradation, and the size distribution should meet the requirements of Table 1;

Table 1 Size distribution of rubber particles

In order to avoid the interference effect of rubber particles on the skeleton of the prepared material of the present invention, the rubber particles only replace the finer 2# mineral material, and are formed by step-by-step matching, the nominal maximum particle size is 9.5mm, and the mineral material interstitial rate is 20-40%. It has good rheological properties during construction and is easy to form; the synthetic gradation is shown in Table 2;

Table 2 Composite gradation design of bridge deck seamless expansion joint materials

After the preliminary research on the modification of the cementitious material, it was found that the cementitious material prepared by compound modification of rubber powder and SBS was better than the matrix asphalt, and the softening point and penetration were greatly improved. The rubber powder and SBS modifier can be uniformly dispersed in the asphalt phase, and the heat resistance and thermal stability of the rubber powder and SBS modifier are higher than that of asphalt, and they can absorb a large amount of water in asphalt. The light component has a swelling effect, so it is not easy to flow in the asphalt structure, the softening point will increase significantly, and the penetration will also decrease. From the results of frequency sweep, temperature sweep, high-temperature creep, and low-temperature stress relaxation, it can be concluded that the modification of rubber powder and SBS modifier improves the temperature sensitivity of matrix asphalt, and greatly improves the high-temperature anti-rutting ability of asphalt and Low temperature crack resistance and aging resistance are also enhanced.

Two kinds of binder modified implementations are preferred, respectively A (ie the binder in Example 1, 2 or 3) and B (ie the binder in Example 4, 5 or 6), and in scheme A press The weight ratio of each component is 90# road petroleum asphalt: rubber powder: SBS modifier=70:25:5; in the scheme B, the weight ratio of each component is 90# road petroleum asphalt: rubber powder: SBS modified Agent = 70:20:10. Table 3 shows the test results of the three conventional indicators of the cement under the two schemes. It can be seen that the performance of the binder in embodiment B is better than that of embodiment A.

Table 3 The test results of the three major indicators of the cement under different implementation schemes

Ratio design of rubber particles instead of mineral materials: Since the ratio of rubber particles is less than that of ordinary mineral materials, the design of mass ratio will completely affect the skeleton structure of the mixture, so the volume method is used to design, and then converted to mass ratio for batching. When the ratio of rubber particles replacing mineral aggregates is small, the rubber particles completely fill in the voids of the mixture, as shown in Figure 1. At this time, the high-temperature anti-rutting performance is excellent, and the low-temperature strain is small; when the rubber particle replacement ratio is large, The rubber particles are partially filled in the voids of the mixture and partially in the skeleton gap, as shown in Figure 2. At this time, the high-temperature stability of the mixture is reduced, but the low-temperature strain increases, which improves the low-temperature cracking resistance. As for the determination of the amount of cementing material, it is considered that the rubber particles will absorb the oil in the asphalt and cause swelling. As a result of swelling, on the one hand, a certain degree of coalescence occurs on the surface of rubber particles, which is conducive to the consolidation of rubber particles, cementing materials and stone materials, and on the other hand, the amount of cementing materials increases. Therefore, the amount of binder increases with the increase of the replacement ratio of rubber particles.

The advantage of the high-expansion bridge deck seamless expansion joint material provided by the present invention is that it can adapt to the displacement of the seamless expansion joint device at low temperature by adjusting the ratio of rubber particles instead of mineral materials, while taking into account the high temperature performance. It has a large strain level at low temperature and a small permanent deformation capacity at high temperature. The invention not only makes full use of waste tires, reduces environmental pollution and low cost, but also has high elasticity and high ductility at low temperature, has better anti-rutting ability at high temperature, and achieves the effect of noise reduction and breaks through the no Joint expansion joint materials can only be used in small-span bridges, and can be applied to medium-span bridges.

The beneficial effect of the present invention is: the rubber powder is used to modify the asphalt binder, and at the same time, rubber particles are used to replace part of the mineral material, combined with the principle of gradation design, a large expansion and contraction bridge deck seamless expansion joint material is prepared, which is characterized in that it can be used at low temperature It has greater deformation ability without cracking, and has better anti-rutting ability at high temperature, which shows that the bridge deck seamless expansion joint material obtained by the present invention has good high temperature stability and excellent low temperature crack resistance. The expansion capacity of the large expansion capacity bridge deck seamless expansion joint material prepared by the above method is greater than or equal to 50 mm, which breaks through the expansion and displacement limitation of conventional seamless expansion joints, and can be popularized and applied in medium-span bridges.

Description of drawings

Fig. 1 is a cross-sectional scan diagram when rubber particles replace 5.0% of the mass of some ore in the mixture in Example 4 of the present invention.

Fig. 2 is a cross-sectional scan diagram when rubber particles in Example 6 of the present invention replace 7.5% of the mass of some ore in the mixture.

Detailed ways

In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples.

Example 1

A preparation method of a bridge deck seamless expansion joint material with a large amount of expansion, which comprises the following steps:

1) Preparation of binder:

① According to the components and their mass percentages: base asphalt (90# road petroleum asphalt) 70.0%, rubber powder 25.0%, SBS modifier 5.0%, select base asphalt, rubber powder and SBS modifier;

②First, heat the base asphalt to a temperature of 140-150°C and add it to a metal container. When the temperature rises to a set temperature of 180°C, slowly add rubber powder and SBS modifier into the metal container containing the base asphalt (The slow addition means that the addition rate is 0.2-0.3mL/s), and stir with a low-speed mixer while heating on the heating furnace, and the stirring speed is controlled within the range of 100r/min-400r/min;

③ When the rubber powder starts to swell, the viscosity rises, and the stirring is difficult, slow down the adding speed of the SBS modifier and continue to stir slowly (the slow adding refers to the adding speed of 0.1-0.2mL/s);

④Repeat the operation of step ③ until all the SBS modifier is added. The time for adding all the SBS modifier is about 10 minutes; The composition is basically uniform;

⑤ Use a high-speed shearing mixer for stirring, the speed of the shearing rotor is 3000r/min-5000r/min, and the asphalt temperature is controlled within the range of 180°C-220°C, and the stirring time is 60min to obtain the cementitious material (or modified asphalt binder);

The three major indicators of the cementing material are: softening point 88°C, penetration (25°C) 41, ductility (5°C) 33.

2) According to 65.4% of 1# mineral material, 12.1% of 2# mineral material, 5.0% of rubber particles, 6.8% of mineral powder filler, and 10.7% of cementing material, select 1# mineral material, 2# mineral material, rubber particles, and mineral powder filler and cement;

Among them, the particle size of 1# mineral material is 4.75mm～9.5mm (excluding 4.75mm, that is, the particle size of 1# mineral material is >4.75mm and ≤9.5mm), the particle size of 2# mineral material is ≤4.75mm, rubber Particle size ≤ 4.75mm (0.3mm ~ 4.75mm);

The mineral material (1# mineral material, 2# mineral material) is andesite (1# mineral material, 2# mineral material are all andesite), its crushing value is 12%, and the needle flake content is 6%; Powder filler (mineral powder) is limestone mineral powder, particle size ≤ 0.075mm;

The rubber granules are crushed from waste tires of trucks at constant temperature, and are used to replace part of the 2# mineral material in the gradation.

The material for the seamless expansion joint of the bridge deck with a large amount of expansion is discontinuously graded, the nominal maximum particle size is 9.5mm, and the mineral gap ratio is 20-40%.

3) Pouring:

① Heat 1# ore and 2# to 280±20°C, pour them into a mixing pot with a temperature of 220°C, then pour rubber particles at room temperature into the mixing pot, and pre-stir for 90s;

②Pour the cement at 200°C into the mixing pot and stir for 90s;

③Finally, add mineral powder filler (or called mineral powder) into the mixing pot and stir for 90 seconds to obtain the seamless expansion joint material of the bridge deck with a large amount of expansion, and then cast (directly pour into the mold, just level the surface, without rolling ).

According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ E20-2011), the high-temperature stability and low-temperature crack resistance of bridge deck seamless expansion joint materials in the examples were studied, and the high-temperature rutting test and low-temperature Three-point bending test is used as an important index to control the performance of expansion joint materials. The test results are shown in Table 4, which shows that the bridge deck seamless expansion joint material obtained in the embodiment of the present invention has good high temperature stability and excellent low temperature crack resistance. .

Example 2

A preparation method of a bridge deck seamless expansion joint material with a large amount of expansion, which comprises the following steps:

1) Preparation of binder:

① According to the components and their mass percentages: base asphalt (90# road petroleum asphalt) 70.0%, rubber powder 25.0%, SBS modifier 5.0%, select base asphalt, rubber powder and SBS modifier;

②First, heat the base asphalt to a temperature of 140-150°C and add it to a metal container. When the temperature rises to a set temperature of 180°C, slowly add rubber powder and SBS modifier into the metal container containing the base asphalt (The slow addition means that the addition rate is 0.2-0.3mL/s), and stir with a low-speed mixer while heating on the heating furnace, and the stirring speed is controlled within the range of 100r/min-400r/min;

③ When the rubber powder starts to swell, the viscosity rises, and the stirring is difficult, slow down the adding speed of the SBS modifier and continue to stir slowly (the slow adding refers to the adding speed of 0.1-0.2mL/s);

④Repeat the operation of step ③ until all the SBS modifier is added. The time for adding all the SBS modifier is about 10 minutes; The composition is basically uniform;

⑤ Use a high-speed shearing mixer for stirring, the speed of the shearing rotor is 3000r/min-5000r/min, and the asphalt temperature is controlled within the range of 180°C-220°C, and the stirring time is 60min to obtain the cementitious material (or modified asphalt binder);

The three major indicators of the cementing material are: softening point 88°C, penetration (25°C) 41, ductility (5°C) 33.

2) According to 66.3% of 1# mineral material, 8.4% of 2# mineral material, 6.8% of rubber particles, 5.7% of mineral powder filler, and 12.8% of cementing material, select 1# mineral material, 2# mineral material, rubber particles, and mineral powder filler and cement;

Among them, the particle size of 1# mineral material is 4.75mm～9.5mm (excluding 4.75mm, that is, the particle size of 1# mineral material is >4.75mm and ≤9.5mm), the particle size of 2# mineral material is ≤4.75mm, rubber Particle size ≤ 4.75mm (0.3mm ~ 4.75mm);

The mineral material (1# mineral material, 2# mineral material) adopts andesite, and its crushing value is 12%, and the needle flake content is 6%; It is used to replace part of the 2# mineral material in the gradation.

The mineral powder is limestone powder with a particle size of ≤0.075mm.

The material for the seamless expansion joint of the bridge deck with a large amount of expansion is discontinuously graded, the nominal maximum particle size is 9.5mm, and the mineral gap ratio is 20-40%.

3) Pouring:

① Heat 1# ore and 2# to 280±20°C, pour them into a mixing pot with a temperature of 220°C, then pour rubber particles at room temperature into the mixing pot, and pre-stir for 90s;

②Pour the cement at 200°C into the mixing pot and stir for 90s;

③Finally, add mineral powder filler (or called mineral powder) into the mixing pot and stir for 90 seconds to obtain the seamless expansion joint material of the bridge deck with a large amount of expansion, and then cast (directly pour into the mold, just level the surface, without rolling ).

According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ E20-2011), the high-temperature stability and low-temperature crack resistance of bridge deck seamless expansion joint materials in the examples were studied, and the high-temperature rutting test and low-temperature Three-point bending test is used as an important index to control the performance of expansion joint materials. The test results are shown in Table 4, which shows that the bridge deck seamless expansion joint material obtained in the embodiment of the present invention has good high temperature stability and excellent low temperature crack resistance. .

Example 3

A preparation method of a bridge deck seamless expansion joint material with a large amount of expansion, which comprises the following steps:

1) Preparation of binder:

① According to the components and their mass percentages: base asphalt (90# road petroleum asphalt) 70.0%, rubber powder 25.0%, SBS modifier 5.0%, select base asphalt, rubber powder and SBS modifier;

②First, heat the base asphalt to a temperature of 140-150°C and add it to a metal container. When the temperature rises to a set temperature of 180°C, slowly add rubber powder and SBS modifier into the metal container containing the base asphalt (The slow addition means that the addition rate is 0.2-0.3mL/s), and stir with a low-speed mixer while heating on the heating furnace, and the stirring speed is controlled within the range of 100r/min-400r/min;

③ When the rubber powder starts to swell, the viscosity rises, and the stirring is difficult, slow down the adding speed of the SBS modifier and continue to stir slowly (the slow adding refers to the adding speed of 0.1-0.2mL/s);

④Repeat the operation of step ③ until all the SBS modifier is added. The time for adding all the SBS modifier is about 10 minutes; The composition is basically uniform;

⑤ Use a high-speed shearing mixer for stirring, the speed of the shearing rotor is 3000r/min-5000r/min, and the asphalt temperature is controlled within the range of 180°C-220°C, and the stirring time is 60min to obtain the cementitious material (or modified asphalt binder);

The three major indicators of the cementing material are: softening point 88°C, penetration (25°C) 41, ductility (5°C) 33.

2) According to 67.9% of 1# mineral material, 5.2% of 2# mineral material, 7.5% of rubber particles, 5.2% of mineral powder filler, and 14.2% of cementing material, select 1# mineral material, 2# mineral material, rubber particles, and mineral powder filler and cement;

Among them, the particle size of 1# mineral material is 4.75mm～9.5mm (excluding 4.75mm, that is, the particle size of 1# mineral material is >4.75mm and ≤9.5mm), the particle size of 2# mineral material is ≤4.75mm, rubber Particle size ≤ 4.75mm (0.3mm ~ 4.75mm);

The mineral material (1# mineral material, 2# mineral material) is made of andesite, its crushing value is 12%, and the needle flake content is 6%; the mineral powder filler (mineral powder) is limestone mineral powder, and its particle size is ≤ 0.075mm;

The rubber granules are crushed from waste tires of trucks at constant temperature, and are used to replace part of the 2# mineral material in the gradation.

The material for the seamless expansion joint of the bridge deck with a large amount of expansion is discontinuously graded, the nominal maximum particle size is 9.5mm, and the mineral gap ratio is 20-40%.

3) Pouring:

① Heat 1# ore and 2# to 280±20°C, pour them into a mixing pot with a temperature of 220°C, then pour rubber particles at room temperature into the mixing pot, and pre-stir for 90s;

②Pour the cement at 200°C into the mixing pot and stir for 90s;

③Finally, add mineral powder filler (or called mineral powder) into the mixing pot and stir for 90 seconds to obtain the seamless expansion joint material of the bridge deck with a large amount of expansion, and then cast (directly pour into the mold, just level the surface, without rolling ).

According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ E20-2011), the high-temperature stability and low-temperature crack resistance of bridge deck seamless expansion joint materials in the examples were studied, and the high-temperature rutting test and low-temperature Three-point bending test is used as an important index to control the performance of expansion joint materials. The test results are shown in Table 4, which shows that the bridge deck seamless expansion joint material obtained in the embodiment of the present invention has good high temperature stability and excellent low temperature crack resistance. .

Example 4

A preparation method of a bridge deck seamless expansion joint material with a large amount of expansion, which comprises the following steps:

1) Preparation of binder:

① According to the components and their mass percentages: base asphalt (90# road petroleum asphalt) 70.0%, rubber powder 20.0%, SBS modifier 10.0%, select base asphalt, rubber powder and SBS modifier;

②First, heat the base asphalt to a temperature of 140-150°C and add it to a metal container. When the temperature rises to a set temperature of 180°C, slowly add rubber powder and SBS modifier into the metal container containing the base asphalt (The slow addition means that the addition rate is 0.2-0.3mL/s), and stir with a low-speed mixer while heating on the heating furnace, and the stirring speed is controlled within the range of 100r/min-400r/min;

③ When the rubber powder starts to swell, the viscosity rises, and the stirring is difficult, slow down the adding speed of the SBS modifier and continue to stir slowly (the slow adding refers to the adding speed of 0.1-0.2mL/s);

④Repeat the operation of step ③ until all the SBS modifier is added. The time for adding all the SBS modifier is about 10 minutes; The composition is basically uniform;

⑤ Use a high-speed shearing mixer for stirring, the speed of the shearing rotor is 3000r/min-5000r/min, and the asphalt temperature is controlled within the range of 180°C-220°C, and the stirring time is 60min to obtain the cementitious material (or modified asphalt binder);

The three major indexes of the cementing material are: softening point 91°C, penetration (25°C) 40, ductility (5°C) 52.

2) According to 65.4% of 1# mineral material, 12.1% of 2# mineral material, 5.0% of rubber particles, 6.8% of mineral powder filler, and 10.7% of cementing material, select 1# mineral material, 2# mineral material, rubber particles, and mineral powder filler and cement;

Among them, the particle size of 1# mineral material is 4.75mm～9.5mm (excluding 4.75mm, that is, the particle size of 1# mineral material is >4.75mm and ≤9.5mm), the particle size of 2# mineral material is ≤4.75mm, rubber Particle size ≤ 4.75mm (0.3mm ~ 4.75mm);

The mineral material (1# mineral material, 2# mineral material) is made of andesite, its crushing value is 12%, and the needle flake content is 6%; the mineral powder filler (mineral powder) is limestone mineral powder, and its particle size is ≤ 0.075mm;

The rubber granules are crushed from waste tires of trucks at constant temperature, and are used to replace part of the 2# mineral material in the gradation.

The material for the seamless expansion joint of the bridge deck with a large amount of expansion is discontinuously graded, the nominal maximum particle size is 9.5mm, and the mineral gap ratio is 20-40%.

3) Pouring:

① Heat 1# ore and 2# to 280±20°C, pour them into a mixing pot with a temperature of 220°C, then pour rubber particles at room temperature into the mixing pot, and pre-stir for 90s;

②Pour the cement at 200°C into the mixing pot and stir for 90s;

③Finally, add mineral powder filler (or called mineral powder) into the mixing pot and stir for 90 seconds to obtain the seamless expansion joint material of the bridge deck with a large amount of expansion, and then cast (directly pour into the mold, just level the surface, without rolling ).

According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ E20-2011), the high-temperature stability and low-temperature crack resistance of bridge deck seamless expansion joint materials in the examples were studied, and the high-temperature rutting test and low-temperature Three-point bending test is used as an important index to control the performance of expansion joint materials. The test results are shown in Table 4, which shows that the bridge deck seamless expansion joint material obtained in the embodiment of the present invention has good high temperature stability and excellent low temperature crack resistance. .

Example 5

A preparation method of a bridge deck seamless expansion joint material with a large amount of expansion, which comprises the following steps:

1) Preparation of binder:

① According to the components and their mass percentages: base asphalt (90# road petroleum asphalt) 70.0%, rubber powder 20.0%, SBS modifier 10.0%, select base asphalt, rubber powder and SBS modifier;

②First, heat the base asphalt to a temperature of 140-150°C and add it to the metal container. When the temperature rises to the set temperature of 190°C, slowly add the rubber powder and SBS modifier into the metal container containing the base asphalt (The slow addition means that the addition rate is 0.2-0.3mL/s), and stir with a low-speed mixer while heating on the heating furnace, and the stirring speed is controlled within the range of 100r/min-400r/min;

③ When the rubber powder starts to swell, the viscosity rises, and the stirring is difficult, slow down the adding speed of the SBS modifier and continue to stir slowly (the slow adding refers to the adding speed of 0.1-0.2mL/s);

④Repeat the operation of step ③ until all the SBS modifier is added. The time for adding all the SBS modifier is about 10 minutes; The composition is basically uniform;

⑤ Use a high-speed shearing mixer for stirring, the speed of the shearing rotor is 3000r/min-5000r/min, and the asphalt temperature is controlled within the range of 180°C-220°C, and the stirring time is 60min to obtain the cementitious material (or modified asphalt binder);

The three major indexes of the cementing material are: softening point 91°C, penetration (25°C) 40, ductility (5°C) 52.

2) According to 66.3% of 1# mineral material, 8.4% of 2# mineral material, 6.8% of rubber particles, 5.7% of mineral powder filler, and 12.8% of cementing material, select 1# mineral material, 2# mineral material, rubber particles, and mineral powder filler and cement;

Among them, the particle size of 1# mineral material is 4.75mm～9.5mm (excluding 4.75mm, that is, the particle size of 1# mineral material is >4.75mm and ≤9.5mm), the particle size of 2# mineral material is ≤4.75mm, rubber Particle size ≤ 4.75mm (0.3mm ~ 4.75mm);

The mineral material (1# mineral material, 2# mineral material) is made of andesite, its crushing value is 12%, and the needle flake content is 6%; the mineral powder filler (mineral powder) is limestone mineral powder, and its particle size is ≤ 0.075mm;

The rubber granules are crushed from waste tires of trucks at constant temperature, and are used to replace part of the 2# mineral material in the gradation.

The material for the seamless expansion joint of the bridge deck with a large amount of expansion is discontinuously graded, the nominal maximum particle size is 9.5mm, and the mineral gap ratio is 20-40%.

3) Pouring:

① Heat 1# ore and 2# to 280±20°C, pour them into a mixing pot with a temperature of 220°C, then pour rubber particles at room temperature into the mixing pot, and pre-stir for 90s;

②Pour the cement at 200°C into the mixing pot and stir for 90s;

③Finally, add mineral powder filler (or called mineral powder) into the mixing pot and stir for 90 seconds to obtain the seamless expansion joint material of the bridge deck with a large amount of expansion, and then cast (directly pour into the mold, just level the surface, without rolling ).

According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ E20-2011), the high-temperature stability and low-temperature crack resistance of bridge deck seamless expansion joint materials in the examples were studied, and the high-temperature rutting test and low-temperature Three-point bending test is used as an important index to control the performance of expansion joint materials. The test results are shown in Table 4, which shows that the bridge deck seamless expansion joint material obtained in the embodiment of the present invention has good high temperature stability and excellent low temperature crack resistance. .

Example 6

A preparation method of a bridge deck seamless expansion joint material with a large amount of expansion, which comprises the following steps:

1) Preparation of binder:

① According to the components and their mass percentages: base asphalt (90# road petroleum asphalt) 70.0%, rubber powder 20.0%, SBS modifier 10.0%, select base asphalt, rubber powder and SBS modifier;

②First, heat the base asphalt to a temperature of 140-150°C and add it to a metal container. When the temperature rises to a set temperature of 180°C, slowly add rubber powder and SBS modifier into the metal container containing the base asphalt (The slow addition means that the addition rate is 0.2-0.3mL/s), and stir with a low-speed mixer while heating on the heating furnace, and the stirring speed is controlled within the range of 100r/min-400r/min;

③ When the rubber powder starts to swell, the viscosity rises, and the stirring is difficult, slow down the adding speed of the SBS modifier and continue to stir slowly (the slow adding refers to the adding speed of 0.1-0.2mL/s);

④Repeat the operation of step ③ until all the SBS modifier is added. The time for adding all the SBS modifier is about 10 minutes; The composition is basically uniform;

⑤ Use a high-speed shearing mixer for stirring, the speed of the shearing rotor is 3000r/min-5000r/min, and the asphalt temperature is controlled within the range of 180°C-220°C, and the stirring time is 60min to obtain the cementitious material (or modified asphalt binder);

The three major indexes of the cementing material are: softening point 91°C, penetration (25°C) 40, ductility (5°C) 52.

2) According to 67.9% of 1# mineral material, 5.2% of 2# mineral material, 7.5% of rubber particles, 5.2% of mineral powder filler, and 14.2% of cementing material, select 1# mineral material, 2# mineral material, rubber particles, and mineral powder filler and cement;

Among them, the particle size of 1# mineral material is 4.75mm～9.5mm (excluding 4.75mm, that is, the particle size of 1# mineral material is >4.75mm and ≤9.5mm), the particle size of 2# mineral material is ≤4.75mm, rubber Particle size ≤ 4.75mm (0.3mm ~ 4.75mm);

The mineral material (1# mineral material, 2# mineral material) is made of andesite, its crushing value is 12%, and the needle flake content is 6%; the mineral powder filler (mineral powder) is limestone mineral powder, and its particle size is ≤ 0.075mm;

The rubber granules are crushed from waste tires of trucks at constant temperature, and are used to replace part of the 2# mineral material in the gradation.

The material for the seamless expansion joint of the bridge deck with a large amount of expansion is discontinuously graded, the nominal maximum particle size is 9.5mm, and the mineral gap ratio is 20-40%.

3) Pouring:

① Heat 1# ore and 2# to 280±20°C, pour them into a mixing pot with a temperature of 220°C, then pour rubber particles at room temperature into the mixing pot, and pre-stir for 90s;

②Pour the cement at 200°C into the mixing pot and stir for 90s;

③Finally, add mineral powder filler (or called mineral powder) into the mixing pot and stir for 90 seconds to obtain the seamless expansion joint material of the bridge deck with a large amount of expansion, and then cast (directly pour into the mold, just level the surface, without rolling ).

According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ E20-2011), the high-temperature stability and low-temperature crack resistance of bridge deck seamless expansion joint materials in the examples were studied, and the high-temperature rutting test and low-temperature Three-point bending test is used as an important index to control the performance of expansion joint materials. The test results are shown in Table 4, which shows that the bridge deck seamless expansion joint material obtained in the embodiment of the present invention has good high temperature stability and excellent low temperature crack resistance. .

Table 4 Test results of seamless expansion joint materials for large expansion bridge decks at high and low temperatures

Table 4 shows that the present invention has greater deformation ability without cracking at low temperature (-10°C), and better anti-rutting ability at high temperature (at 60°C).

Example 7

A preparation method of a bridge deck seamless expansion joint material with a large amount of expansion, which comprises the following steps:

1) Preparation of binder:

①According to each component and its mass percentage: 110# road petroleum asphalt 65.0%, rubber powder 25.0%, SBS modifier 10.0%, select base asphalt, rubber powder and SBS modifier;

②First, heat the base asphalt to a temperature of 140-150°C and add it to a metal container. When the temperature rises to a set temperature of 180°C, slowly add rubber powder and SBS modifier into the metal container containing the base asphalt (The slow addition means that the addition rate is 0.2-0.3mL/s), and stir with a low-speed mixer while heating on the heating furnace, and the stirring speed is controlled within the range of 100r/min-400r/min;

③ When the rubber powder starts to swell, the viscosity rises, and the stirring is difficult, slow down the adding speed of the SBS modifier and continue to stir slowly (the slow adding refers to the adding speed of 0.1-0.2mL/s);

④Repeat the operation of step ③ until all the SBS modifier is added. The time for adding all the SBS modifier is about 10 minutes; The composition is basically uniform;

⑤ Use a high-speed shearing mixer for stirring, the speed of the shearing rotor is 3000r/min-5000r/min, and the asphalt temperature is controlled within the range of 180°C-220°C, and the stirring time is 60min to obtain the cementitious material (or modified asphalt binder);

2) According to 1# mineral material 60.0%, 2# mineral material 7.0%, rubber particles 8.5%, mineral powder filler 7.0%, cementing material 17.5%, select 1# mineral material, 2# mineral material, rubber particles, mineral powder filler and cement;

Among them, the particle size of 1# mineral material is 4.75mm～9.5mm (excluding 4.75mm, that is, the particle size of 1# mineral material is >4.75mm and ≤9.5mm), the particle size of 2# mineral material is ≤4.75mm, rubber Particle size ≤ 4.75mm (0.3mm ~ 4.75mm);

The mineral materials (1# mineral material, 2# mineral material) are basalt (1# mineral material, 2# mineral material are all basalt), have sufficient strength (crushing value ≤ 20%), and strictly control the set Needle flakes in the material (needle flake content ≤ 10%); mineral powder filler (mineral powder) is limestone mineral powder, particle size ≤ 0.075mm;

3) Pouring:

① Heat 1# ore and 2# to 280±20°C, pour them into a mixing pot with a temperature of 220°C, then pour rubber particles at room temperature into the mixing pot, and pre-stir for 90s;

②Pour the cement at 200°C into the mixing pot and stir for 90s;

③Finally, add mineral powder filler (or called mineral powder) into the mixing pot and stir for 90 seconds to obtain the seamless expansion joint material of the bridge deck with a large amount of expansion, and then cast (directly pour into the mold, just level the surface, without rolling ).

According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ E20-2011), the high-temperature stability and low-temperature crack resistance of bridge deck seamless expansion joint materials in the examples were studied, and the high-temperature rutting test and low-temperature The three-point bending test is an important indicator for controlling the performance of the expansion joint material. The test results are shown in Table 5, which shows that the bridge deck seamless expansion joint material obtained in the embodiment of the present invention has good high temperature stability and excellent low temperature crack resistance. .

Example 8

A preparation method of a bridge deck seamless expansion joint material with a large amount of expansion, which comprises the following steps:

1) Preparation of binder:

①According to each component and its mass percentage: 110# road petroleum asphalt 75.0%, rubber powder 20.0%, SBS modifier 5.0%, select base asphalt, rubber powder and SBS modifier;

②First, heat the base asphalt to a temperature of 140-150°C and add it to the metal container. When the temperature rises to the set temperature of 220°C, slowly add the rubber powder and SBS modifier into the metal container containing the base asphalt (The slow addition means that the addition rate is 0.2-0.3mL/s), and stir with a low-speed mixer while heating on the heating furnace, and the stirring speed is controlled within the range of 100r/min-400r/min;

③ When the rubber powder starts to swell, the viscosity rises, and the stirring is difficult, slow down the adding speed of the SBS modifier and continue to stir slowly (the slow adding refers to the adding speed of 0.1-0.2mL/s);

④Repeat the operation of step ③ until all the SBS modifier is added. The time for adding all the SBS modifier is about 10 minutes; The composition is basically uniform;

⑤ Use a high-speed shearing mixer for stirring, the speed of the shearing rotor is 3000r/min-5000r/min, and the asphalt temperature is controlled within the range of 180°C-220°C, and the stirring time is 60min to obtain the cementitious material (or modified asphalt binder);

2) According to 1# mineral material 70.0%, 2# mineral material 4.0%, rubber particles 8.0%, mineral powder filler 4.5%, cementing material 13.5%, select 1# mineral material, 2# mineral material, rubber particles, mineral powder filler and cement;

Among them, the particle size of 1# mineral material is 4.75mm～9.5mm (excluding 4.75mm, that is, the particle size of 1# mineral material is >4.75mm and ≤9.5mm), the particle size of 2# mineral material is ≤4.75mm, rubber Particle size ≤ 4.75mm (0.3mm ~ 4.75mm);

The mineral materials (1# mineral material, 2# mineral material) are limestone (1# mineral material, 2# mineral material are all limestone), have sufficient strength (crushing value ≤ 20%), and strictly control the set Needle flakes in the material (needle flake content ≤ 10%); mineral powder filler (mineral powder) is limestone mineral powder, particle size ≤ 0.075mm;

The rubber granules are crushed from waste tires of trucks at constant temperature, and are used to replace part of the 2# mineral material in the gradation.

3) Pouring:

① Heat 1# ore and 2# to 280±20°C, pour them into a mixing pot with a temperature of 220°C, then pour rubber particles at room temperature into the mixing pot, and pre-stir for 90s;

②Pour the cement at 200°C into the mixing pot and stir for 90s;

③Finally, add mineral powder filler (or called mineral powder) into the mixing pot and stir for 90 seconds to obtain the seamless expansion joint material of the bridge deck with a large amount of expansion, and then cast (directly pour into the mold, just level the surface, without rolling ).

According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ E20-2011), the high-temperature stability and low-temperature crack resistance of bridge deck seamless expansion joint materials in the examples were studied, and the high-temperature rutting test and low-temperature The three-point bending test is an important indicator for controlling the performance of the expansion joint material. The test results are shown in Table 5, which shows that the bridge deck seamless expansion joint material obtained in the embodiment of the present invention has good high temperature stability and excellent low temperature crack resistance. .

Example 9

A preparation method of a bridge deck seamless expansion joint material with a large amount of expansion, which comprises the following steps:

1) Preparation of binder:

①According to each component and its mass percentage: 130# road petroleum asphalt 70.0%, rubber powder 22.0%, SBS modifier 8.0%, select base asphalt, rubber powder and SBS modifier;

②First, heat the base asphalt to a temperature of 140-150°C and add it to a metal container. When the temperature rises to a set temperature of 180°C, slowly add rubber powder and SBS modifier into the metal container containing the base asphalt (The slow addition means that the addition rate is 0.2-0.3mL/s), and stir with a low-speed mixer while heating on the heating furnace, and the stirring speed is controlled within the range of 100r/min-400r/min;

③ When the rubber powder starts to swell, the viscosity rises, and the stirring is difficult, slow down the adding speed of the SBS modifier and continue to stir slowly (the slow adding refers to the adding speed of 0.1-0.2mL/s);

④Repeat the operation of step ③ until all the SBS modifier is added. The time for adding all the SBS modifier is about 10 minutes; The composition is basically uniform;

⑤ Use a high-speed shearing mixer for stirring, the speed of the shearing rotor is 3000r/min-5000r/min, and the asphalt temperature is controlled within the range of 180°C-220°C, and the stirring time is 60min to obtain the cementitious material (or modified asphalt binder);

2) According to 1# mineral material 69.0%, 2# mineral material 14.0%, rubber particles 4.0%, mineral powder filler 4.0%, cementing material 9.0%, select 1# mineral material, 2# mineral material, rubber particles, mineral powder filler and cement;

Among them, the particle size of 1# mineral material is 4.75mm～9.5mm (excluding 4.75mm, that is, the particle size of 1# mineral material is >4.75mm and ≤9.5mm), the particle size of 2# mineral material is ≤4.75mm, rubber Particle size ≤ 4.75mm (0.3mm ~ 4.75mm, the size distribution of rubber particles is shown in Table 1);

The mineral material (1# mineral material, 2# mineral material) is basalt (both 1# mineral material and 2# mineral material can be basalt), with sufficient strength (crushing value ≤ 20%), and strictly controlled Needle flakes in the aggregate (needle flake content ≤ 10%); mineral powder filler (mineral powder) is limestone mineral powder, particle size ≤ 0.075mm;

3) Pouring:

① Heat 1# ore and 2# to 280±20°C, pour them into a mixing pot with a temperature of 220°C, then pour rubber particles at room temperature into the mixing pot, and pre-stir for 90s;

②Pour the cement at 200°C into the mixing pot and stir for 90s;

③Finally, add mineral powder filler (or called mineral powder) into the mixing pot and stir for 90 seconds to obtain the seamless expansion joint material of the bridge deck with a large amount of expansion, and then cast (directly pour into the mold, just level the surface, without rolling ). Its related properties are shown in Table 5.

According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ E20-2011), the high-temperature stability and low-temperature crack resistance of bridge deck seamless expansion joint materials in the examples were studied, and the high-temperature rutting test and low-temperature The three-point bending test is an important indicator for controlling the performance of the expansion joint material. The test results are shown in Table 5, which shows that the bridge deck seamless expansion joint material obtained in the embodiment of the present invention has good high temperature stability and excellent low temperature crack resistance. .

Table 5 Experimental results of large expansion bridge deck seamless expansion joint materials at high and low temperatures

Table 5 shows that the present invention has greater deformation ability at low temperature (-10°C) without cracking, and better anti-rutting ability at high temperature (at 60°C).

Each raw material listed in the present invention, as well as the upper and lower limits and interval values of each raw material in the present invention, and the upper and lower limits and interval values of process parameters (such as temperature, time, etc.) can all realize the present invention, and are not listed one by one here. Example.

Claims (9)

1. A large amount of expansion bridge deck seamless expansion joint material is characterized in that it is prepared from 1# ore, 2# ore, rubber particles, mineral powder filler and cementing material, and the mass percentage of each raw material For: 1# mineral material 60.0%～70.0%, 2# mineral material 4.0%～14.0%, rubber particles 4.0%～8.5%, mineral powder filler 4.0%～7.0%, cementing material 9.0%～17.5%; Among them, the particle size of 1# mineral material is >4.75mm and ≤9.5mm, the particle size of 2# mineral material is ≤4.75mm, and the particle size of rubber particles is ≤4.75mm; The components of the cementitious material and their mass percentages are: base asphalt 65.0-75.0%, rubber powder 20.0%-25.0%, SBS modifier 5.0-10.0%. 2. The material for a bridge deck seamless expansion joint with a large amount of expansion according to claim 1, wherein the mineral material is basalt, limestone or andesite. 3. The material for seamless expansion joints of a bridge deck with a large amount of expansion according to claim 1, characterized in that the mineral powder filler is limestone mineral powder with a particle size of ≤0.075mm. 4. A large expansion capacity bridge deck seamless expansion joint material according to claim 1, characterized in that the base asphalt is high-grade road petroleum asphalt, the penetration range is 80-120, and the softening point is not lower than 41 ℃, 15℃ ductility not less than 100cm. 5 . The material for a bridge deck seamless expansion joint with a large amount of expansion according to claim 1 , wherein the particle size of the rubber powder is 60 mesh to 200 mesh. 6 . 6. A kind of bridge deck seamless expansion joint material with large amount of expansion according to claim 1, characterized in that the SBS modifier is a star-shaped SBS modifier. 7. a kind of preparation method of bridge deck seamless expansion joint material with large amount of expansion as claimed in claim 1, is characterized in that it comprises the steps: 1) Preparation of binder: ①According to each component and its mass percentage: base asphalt 65.0-75.0%, rubber powder 20.0%-25.0%, SBS modifier 5.0-10.0%, select base asphalt, rubber powder and SBS modifier; ②First, heat the base asphalt to a temperature of 140-150°C and add it to the container. When the temperature rises to a set temperature of 180-220°C, add rubber powder and SBS modifier to the container containing the base asphalt , stir with a low-speed mixer while heating, and the stirring speed is controlled within the range of 100r/min to 400r/min; ③ When the rubber powder starts to swell, the viscosity rises, and the stirring is difficult, slow down the adding speed of the SBS modifier and continue stirring; ④Repeat the operation of step ③ until all the SBS modifier is added, then increase the speed of the low-speed mixer and maintain it at 400r/min~750r/min until the ingredients are basically uniform; ⑤ Use a high-speed shearing mixer for stirring, the speed of the shearing rotor is 3000r/min-5000r/min, and the temperature is controlled within the range of 180°C-220°C, and the stirring time is 60min to obtain the cementitious material; 2) According to 60.0%～70.0% of 1# mineral material, 4.0%～14.0% of 2# mineral material, 4.0%～8.5% of rubber particle, 4.0%～7.0% of mineral powder filler, 9.0%～17.5% of cementing material, select 1 # Mineral material, 2# mineral material, rubber particles, mineral powder filler and cementing material; Among them, the particle size of 1# mineral material is >4.75mm and ≤9.5mm, the particle size of 2# mineral material is ≤4.75mm, and the particle size of rubber particles is ≤4.75mm; 3) Pouring: ① Heat 1# ore and 2# to 280±20°C, pour it into a mixing pot with a temperature of 220°C, then pour rubber particles at room temperature into the mixing pot, and pre-stir for 90s; ②Pour the cement at 200°C into the mixing pot and stir for 90s; ③Finally, add the mineral powder filler into the mixing pot and stir for 90s to obtain the seamless expansion joint material of the bridge deck with large expansion capacity, and then pour it. 8. The preparation method of a large-scale expansion bridge deck seamless expansion joint material according to claim 7, wherein the rubber particles are crushed from waste tires at normal temperature, and the size distribution will meet the requirements of Table 1. Table 1 Size distribution of rubber particles . 9. a kind of preparation method of bridge deck seamless expansion joint material according to claim 7, is characterized in that, described mineral material is basalt, limestone or andesite; Mineral powder filler is limestone mineral powder, grain Diameter≤0.075mm.