CN108863200A - Cement-based material, fabric concrete for repairing bridge expanssion joint and preparation method thereof and bridge expanssion joint method for repairing and mending - Google Patents

Abstract

The invention provides a cement-based material for repairing bridge expansion joints, the cement-based material is composed of the following components: 60-75 parts of cement, 25-40 parts of modified materials; the modified materials include the following components: The component is 50-80 parts, the setting component is 20-40 parts, the anti-corrosion component is 0.5-5 parts, and the expansion component is 0.5-5 parts. The invention also provides fabric concrete for repairing bridge expansion joints, a preparation method of the fabric concrete and a bridge expansion joint repair method. The fabric concrete provided by the invention can be conveniently constructed, and can be opened to traffic within 0.5h-1h after the construction is completed, and also has the advantages of high strength, high toughness, good durability, easy maintenance, flame retardancy, etc., and can realize no car jumping and low noise , wear resistance, while ensuring comfortable and safe driving, the construction scheme of watering and curing is simple and efficient, and can adapt to various engineering application requirements.

Description

Cement-based material, fabric concrete and its preparation method for repairing bridge expansion joints Method and bridge expansion joint repair method

technical field

The invention relates to a cement-based material for repairing bridge expansion joints, fabric concrete and a preparation method thereof, and a repair method for bridge expansion joints, belonging to the technical field of fabric concrete.

Background technique

Domestic standard bridges are suffering from increasing traffic damage, especially the bridge deck expansion joints that directly bear the repeated loads of vehicles. Expansion joints are usually set between two girder ends, between girder ends and abutments, or at the hinged position of bridges. Damage to bridge expansion joints not only affects the normal use of the bridge, but also causes adverse social impacts. Exploration and research have accumulated a lot of experience, and the construction technology has gradually matured. However, due to the limitations of construction technical requirements and repair material technology, there are still technical problems in the repair of expansion joints, such as high cost, large amount of work, poor durability, and long construction period. Bridge expansion joints have many repair procedures and are difficult to repair. At present, the most commonly used material for domestic expansion joint maintenance is ultra-fast hardening concrete. Although its opening time for traffic is relatively short, there are still problems such as brittleness and hardness of ordinary concrete, poor interface bonding, and serious secondary damage. Therefore, in order to solve the above technical problems and make expansion joint repair meet the technical requirements of simplicity, rapidity and durability, it is of great significance to study a new type of ductile fabric concrete with excellent properties.

Contents of the invention

The problem to be solved by the present invention is to provide a cement-based material for repairing bridge expansion joints, fabric concrete and its preparation method for the existing technical problems of high maintenance cost, large engineering quantity, poor durability and long construction period. Bridge expansion joint repair method.

In order to solve the above technical problems, the technical solution adopted in the present invention is: a cement-based material for repairing bridge expansion joints, the cement-based material is composed of the following components: 60-75 parts of cement, 25-40 parts of modified materials The modified material includes the following components: 50-80 parts of reinforcing components, 20-40 parts of coagulation regulating components, 0.5-5 parts of anti-corrosion components, and 0.5-5 parts of expansion components. In the present invention, in the present invention, the strengthening component is used to adjust the flexural strength, compressive strength, wear resistance, and frost resistance of the cement-based material, and the setting-adjusting component is used to adjust the setting time of the cement-based material to prevent corrosion. The components are used to prevent cement-based materials from being corroded, and the expansion components are used to adjust the expansion properties of cement-based materials. Reinforcement components, coagulation adjustment components, anti-corrosion components, and expansion components can improve the bending strength, compressive strength, wear resistance parameters, frost resistance grade and other parameters of fabric concrete, and can also adjust the setting time of fabric concrete to ensure Open to traffic quickly after repair. The cement is low alkalinity sulfoaluminate cement.

Further, the reinforcing component is one or more of nano-SiO2, silica fume, rubber powder, metakaolin, nano-calcium, and sodium sulfate.

Further, the setting adjusting component is one or more of lithium carbonate, CaCl2, boric acid, and gypsum.

Further, the anti-corrosion component is one or more of boron nitride, silicon phosphate, and calcium nitrite.

Further, the expansion component is one or more of calcium sulfoaluminate, calcium oxide and calcium sulfoaluminate-calcium oxide.

The present invention also provides a fabric concrete for repairing expansion joints of bridges, comprising a first fabric structure comprising two first fabric layers oppositely arranged and a plurality of threads connecting the two first fabric layers piles, each line pile is filled with the cement-based material as described in any one of the above. In the present invention, the fabric concrete has the toughness of the first fabric structure and the strength of the cement-based material at the same time, and the first fabric structure improves the toughness and crack resistance of the fabric concrete and improves the strength. The first fabric structure may also act as a carrier for cementitious materials.

Further, the number of the first fabric structures is at least two, and each first fabric structure is stacked; preferably, the first fabric layer is a mesh structure. The two ends of each line pile are respectively connected with two first fabric layers, so that the first fabric structure forms a firm whole. The stacked at least two first fabric structures make the forming thickness (height) of the fabric concrete of the present invention adjustable, thereby adapting to the repair of different expansion joints. By setting the first fabric layer as a mesh structure, the cement-based material can pass through the first fabric layer, so that the contact between the cement-based material and the first fabric structure is closer.

Further, the fabric concrete also includes a second fabric structure for sealing and containing the first fabric structure; preferably, a repair groove for adhering the second fabric structure to the expansion joint is arranged on the outside of the second fabric structure the adhesive layer. Preferably said second textile structure is formed from a top encapsulation layer, a bottom encapsulation layer and a side encapsulation layer forming a unitary structure. Preferably, the second fabric structure is a water-permeable synthetic material in which synthetic fibers are needled or woven. Preferably, the adhesive layer is disposed under the bottom encapsulation layer or on the side encapsulation layer. By setting the second fabric structure, the second fabric structure can wrap the first fabric structure and the cement-based material, which can prevent the cement-based material from leaking out of the fabric structure and facilitate adding cement-based material into the second fabric structure. The first fabric structure and the second fabric structure are fixedly connected. The two form an integral structure to ensure the integrity of the fabric. By arranging the adhesive layer, the fabric concrete of the present invention can be firmly bonded to the construction work surface without slipping, achieving the purpose of fixed-point construction, and having the functions of preventing seepage, waterproofing and falling off.

The present invention also provides a method for preparing fabric concrete for repairing bridge expansion joints as described above, wherein the second fabric structure is encapsulated by a top surface encapsulation layer, a bottom surface encapsulation layer and a side encapsulation forming an integral structure. Layer constitution, described preparation method comprises the steps:

(a-1) sealing the first fabric layer of the first fabric structure with the bottom surface encapsulation layer and the side surface encapsulation layer of the second fabric structure respectively, and not sealing the first fabric structure and the top surface encapsulation layer;

(b-1) uniformly mixing cement, reinforcing components, setting-adjusting components, anti-corrosion components, and expansion components under dry conditions to obtain a dry cement-based material;

(c-1) filling the cement-based material dried in the step (b-1) between each line pile;

(d-1) After the cement-based material is filled, seal the first fabric structure and the top surface encapsulation layer to obtain uncured fabric concrete;

The order of the step (a-1) and the step (b-1) can be exchanged.

Since the cement-based material is obtained under dry conditions, and after the cement-based material is filled, the fabric concrete is not cured, so the shape of the fabric concrete can be adjusted, and it can be applied to the repair of different expansion joints, just put the fabric concrete into the bridge expansion joint The bridge expansion joints can be repaired by pouring water into the repair tank, and then solidifying into a fixed shape. The method is simple. Compared with the traditional repair of bridge expansion joints, it greatly simplifies the repair process and saves time. In the step (a-1), since the first fabric structure and the top surface encapsulation layer are not sealed, it is convenient to spread the cement-based material from the top surface of the fabric in the step (b-1). In step (d-1), after the cement-based material is filled, the first fabric structure is sealed with the top surface encapsulation layer, which also prevents the cement-based material from leaking out of the fabric. Since the cement-based material is in a dry condition, it needs to be mixed at a low speed in a dry mixer to avoid waste of the cement-based material from splashing.

The present invention also provides a method for repairing bridge expansion joints using the fabric concrete described in any one of the above, and the repair method includes the following steps:

(a-2) Put the uncured fabric concrete into the repair groove of the expansion joint to be repaired;

(b-2) watering the fabric concrete to solidify the fabric concrete;

(c-2) After watering, the repair can be completed after curing for 0.5h-1h.

The fabric concrete of the invention is convenient to use, good in mechanical properties, good in durability, quick in traffic and easy in maintenance. The performance of the fabric concrete satisfies: the fabric concrete has high toughness and a frost resistance grade ≥ F25, the compressive strength of the fabric concrete ≥ 40Mpa 1 hour after the fabric concrete is formed, and the compressive strength ≥ 90Mpa 28 days after the fabric concrete is formed. The fabric concrete of the present invention can be conveniently constructed, and can be opened to traffic within 0.5h-1h after construction, and also has the advantages of high strength, high toughness, good durability, easy maintenance, flame retardancy, etc., and can realize no jumping, low noise, and durability Wear and tear, while ensuring driving comfort and safety. Its construction scheme of watering and solidification is simple and efficient, and can adapt to the application requirements of various disposal engineering applications such as bridge expansion joint maintenance, road surface reflection crack treatment, and pothole repair. It provides an effective method for engineering problems such as large quantity, poor durability and long construction period, and has important practical significance for maintaining ecological balance and achieving sustainable development. The fabric concrete manufactured by the present invention is not cured, so the shape of the fabric concrete can be adjusted, and it can be applied to the repair of different expansion joints. It only needs to put the fabric concrete into the expansion joint repair tank, and then water it to solidify into a fixed shape. The repair of expansion joints can be realized, and the method is simple. Compared with the repair of traditional expansion joints, the repair process is greatly simplified and time is saved.

Compared with prior art, the beneficial effect of the present invention is:

(1) The raw materials and mix ratio design used in the present invention are different from ordinary concrete. In contrast, the raw materials and mix ratio method theory of fabric concrete cement-based materials are more mature and perfect, the operation is simple, the cost is controllable, and the performance is better;

(2) The fabric concrete of the present invention adopts aggregate-free cement-based materials, which can avoid the occurrence of air bubbles and pores after the concrete is formed, reduce the erosion caused by leakage, thereby improving the mechanical properties and durability of the fabric concrete;

(3) The fabric concrete prepared by the present invention has both the toughness of the fabric and the mechanical properties of cement-based materials, and is better than ordinary concrete in mechanical properties, better in durability, and less prone to brittle failure; adopting the method of rapid curing and molding by watering, it can Effectively solve a series of problems such as difficult maintenance, poor maintenance effect and high maintenance cost;

(4) The present invention aims at engineering problems such as high maintenance cost, large amount of work, poor durability and long construction period, which are ubiquitous in current bridge expansion joint maintenance, and improves the comprehensive performance, service quality, service life and promotion of bridge expansion joint maintenance materials A solution and a maintenance technical plan are proposed for problems that have a greater impact such as application. This technology can ensure the high toughness of the fabric concrete and the frost resistance level ≥ F25, and meet the requirements of rapid traffic opening (0.5h-1h after the fabric concrete is formed). At the same time, the compressive strength of the fabric concrete is ≥40Mpa 1 hour after the fabric concrete is formed, and the compressive strength of the fabric concrete is ≥90Mpa 28 days after the fabric concrete is formed, which can effectively solve the problem of long construction period and poor durability of ordinary concrete due to its poor performance. It can be widely used in the maintenance of bridge expansion joints, the repair of white-to-black reflective cracks on the road surface, the repair of road potholes, and can be applied to complex conditions such as heavy-duty traffic and heavy traffic.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is the longitudinal section schematic diagram of the fabric concrete of the embodiment of the present invention;

Fig. 2 is a schematic longitudinal section of the first fabric structure of fabric concrete not filled with cement-based materials according to an embodiment of the present invention;

Fig. 3 is a schematic top view of the first fabric layer of the first fabric structure of fabric concrete according to an embodiment of the present invention;

Fig. 4 is a schematic longitudinal sectional view of fabric concrete not filled with cement-based materials and stacked with two first fabric layers according to an embodiment of the present invention;

Fig. 5 is a cross-sectional schematic diagram of a first fabric structure not filled with cement-based materials according to an embodiment of the present invention;

Fig. 6 is a cross-sectional schematic view of the first fabric structure filled with cement-based material according to the embodiment of the present invention.

In the figure, 11, the first fabric layer, 12, wire stakes, 21, the top surface encapsulation layer, 22, the bottom surface encapsulation layer, 23, the side encapsulation layer, 3, the cement-based material, 4, the adhesion layer.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings of the present application. Apparently, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

The present invention provides a cement-based material for repairing bridge expansion joints. The cement-based material 3 is composed of the following components: 60-75 parts of cement, 25-40 parts of modified materials; the modified materials include the following components Divide: 50-80 parts of strengthening component, 20-40 parts of coagulation regulating component, 0.5-5 parts of anti-corrosion component, 0.5-5 parts of expansion component.

The modified material includes a strengthening component, a coagulation regulating component, an anti-corrosion component and an expansion component. The reinforcing components are used to adjust the flexural strength, compressive strength, wear resistance, and frost resistance of the cement-based material 3 . The setting adjusting component is used to adjust the setting time of the cement-based material 3 . The anti-corrosion component serves to prevent the cement-based material 3 from corrosion. The expansion component serves to adjust the expansion properties of the cementitious material 3 . The cement-based material 3 can be solidified to form strength after watering.

The cement is sulphoaluminate cement. The sulphoaluminate cement is preferably a low alkalinity sulphoaluminate cement.

The reinforcing component is one or more of nano-SiO2, silica fume, rubber powder, metakaolin, nano-calcium, and sodium sulfate. The reinforcing component is used to adjust the workability and/or flexural and compressive strength and/or cohesiveness and/or mechanical properties and/or toughness and/or impermeability, wear resistance, and anti-permeability of the cement-based material 3. freezing performance. The main functions of reinforcing components include improving the workability of fabric concrete, increasing the flexural and compressive strength of various ages, increasing the bonding of cement-based materials, enhancing mechanical properties, improving toughness, improving impermeability and wear resistance .

The coagulation adjusting component is one or more of lithium carbonate, CaCl2, boric acid and gypsum. The setting adjusting component is used to adjust the initial setting time and final setting time of the cement-based material 3 . The main function of the setting adjusting component material includes adjusting the initial setting and final setting time of the cement-based material 3 by controlling the dosage, so that the fabric concrete of the present invention can adapt to different climate environments.

The anti-corrosion component is one or more of boron nitride, silicon phosphate and calcium nitrite. The anti-corrosion component serves to prevent the cement-based material 3 from corrosion. The main functions of the anti-corrosion component materials include making the fabric concrete have good properties such as resistance to salt ion erosion, resistance to freeze-thaw cycle damage, and high resistance to penetration.

The expansion component is one or more of calcium sulfoaluminate, calcium oxide and calcium sulfoaluminate-calcium oxide. The expansion component serves to adjust the expansion properties of the cementitious material 3 . The main functions of the expansion component include stabilizing the expansion performance of the cement-based material 3, good durability, and continuous increase in strength, thereby preventing cracks in the fabric concrete due to temperature differences.

In the present invention, the reinforcement component, the setting adjustment component, the anti-corrosion component, and the expansion component all have effects on the repair of bridge expansion joints: if no reinforcement component is used, the fabric concrete may not be able to reach the traffic opening in a short period of time. Mechanical performance requirements, thus affecting the scope of application of fabric concrete; if no coagulation-adjusting components are used, the fabric concrete may take a long time to form, thus failing to achieve the purpose of quick repair and short-term opening to traffic; if no anti-corrosion components are used, it may As a result, the anti-salt ion erosion performance of the fabric concrete is reduced, making the overall corrosion resistance insufficient, and it is difficult to adapt to the harsh construction environment; if the expansion component is not used, the volume shrinkage of the cement-based material may be too large after hydration, making the overall fabric concrete Structural deformation reduces overall performance. In the present invention, fabric concrete is made of cement-based materials that contain a combination of reinforcing components, setting-adjusting components, anti-corrosion components and expansion components, so that the fabric concrete can achieve high strength, rapid hardening, strong erosion resistance and The purpose of overall structural stability.

As shown in Fig. 1, the present invention provides a fabric concrete for repairing expansion joints of bridges, including fabric and cement-based material 3 filled in the fabric. The cement-based material 3 is densely filled in the fabric. The fabric concrete uses high-performance fabric as a carrier and cement-based material 3 as a filler for dense filling to form the fabric concrete. The fabric is a three-dimensional spacer fabric. The fabric includes a first fabric structure and a second fabric structure encasing the first fabric structure.

The fabric concrete used for repairing bridge expansion joints includes a first fabric structure, a second fabric structure and the above-mentioned cement-based material 3 .

The first fabric structure and the second fabric structure are sealed together, and the cement-based material 3 is filled in the first fabric structure. The first fabric structure and the second fabric structure are sealed through a needling process. The thickness of the fabric is 5mm-40mm, which can form multi-purpose fabric concrete with different performance levels, which greatly increases the applicable engineering range of the fabric concrete of the present invention. The first fabric structure and the second fabric structure are wrapped and wrapped. The second fabric structure comprises a top surface encapsulation layer 21, a bottom surface encapsulation layer 22, and a side encapsulation layer 23, and the first fabric structure is covered and packaged in all directions. The first fabric structure and the second fabric structure are closely attached. Fig. 5 is a cross-sectional schematic diagram of the first fabric structure not filled with cement-based material according to the embodiment of the present invention. Fig. 6 is a cross-sectional schematic diagram of the first fabric structure filled with cement-based material according to the embodiment of the present invention. For simplicity, the specific structure of the first fabric layer 11 is not shown in Fig. 5 and Fig. 6 . For omission, the same structure in Fig. 5 and Fig. 6 is not drawn.

As shown in Figures 2-3, the first fabric structure includes two first fabric layers 11 oppositely arranged and a plurality of wire piles 12 connecting the two first fabric layers 11, and cement is filled between each wire pile 12 base material3. The first fabric layer 11 is a mesh fiber fabric layer. Preferably the reticulated fiber fabric layer is a reticulated fiber mesh. The two first fabric layers 11 of the first fabric structure are located above and below respectively, with wire stakes 12 connected in the middle.

As shown in FIG. 4 , if the thickness of the fabric concrete needs to be adjusted, the number of the first fabric structures can be adjusted. The number of the first fabric structures is at least two, and each first fabric structure is stacked. Cement-based material 3 is filled between the upper surface and the lower surface of the first fabric layer 11 . Preferably, the first fabric layer 11 is a mesh structure. The stacked at least two first fabric structures make the forming thickness (height) of the fabric concrete of the present invention adjustable, thereby adapting to the repair of different expansion joints. By setting the first fabric layer as a mesh structure, the cement-based material can pass through the first fabric layer, so that the contact between the cement-based material and the first fabric structure is closer. The upper first textile layer 11 of the first textile structure is referred to as the upper textile layer, and the lower first textile layer 11 of the first textile structure is referred to as the lower textile layer. When each first fabric structure is stacked and set, the cement-based material leaks from between the mesh structure of the upper fabric layer of the first fabric structure located at the top to between the wire piles 12, then to the lower fabric layer, and then to the The first fabric structure located below leaks from the upper fabric layer of the first fabric structure located below to between the wire piles 12, so as to realize the filling of the cement-based material 3 between the wire piles 12 of each first fabric structure, thereby Ensure the filling density of the overall fabric concrete. The first fabric structure can be woven by a warp knitting machine through automatic control of a microcomputer.

In the first fabric structure, the two ends of each wire stake 12 are respectively connected with two first fabric layers 11, so that the first fabric structure forms a firm whole.

The second fabric structure is used to hermetically contain the first fabric structure. The second fabric structure is composed of a top sealing layer 21 , a bottom sealing layer 22 and a side sealing layer 23 forming an integral structure; preferably the second fabric structure is a water-permeable synthetic material made of synthetic fibers through needle punching or weaving.

The outside of the second fabric structure is also provided with an adhesive layer 4 for adhering the second fabric structure in the repair groove of the expansion joint. The adhesive layer 4 is disposed under the bottom encapsulation layer or on the side encapsulation layer. The main function of the adhesive layer 4 is to enable the fabric concrete of the present invention to be firmly bonded to the construction work surface without sliding, to achieve the purpose of fixed-point construction, and to play the role of anti-seepage, waterproof, and anti-shedding. Adhesive layer 4 can adopt one or more of reactive normal-temperature asphalt, high-viscosity and high-elasticity asphalt, pressure-sensitive adhesive, heat-sensitive adhesive, epoxy resin, thermosetting resin, and synthetic resin polymer.

In the present invention, the first fabric structure and the second fabric structure are cut to a suitable size, and then the bottom surface and the side surface of the two are sealed through a needle punching process, and the top surface filler is reserved; the ratio of the cement-based material 3 is calculated and mixed Evenly; vibrate the filler until it is dense; encapsulate the top surface to form fabric concrete; after the production is completed, put the fabric concrete into the expansion joint repair tank and water it to solidify and shape it, and the repair can be completed after curing for 0.5h-1h.

The present invention provides a kind of preparation method of above-mentioned fabric concrete, it is characterized in that, the preparation method of described fabric concrete comprises the steps:

(a-1) Preparation of fabric:

The first fabric structure and the second fabric structure are cut to a suitable size, and the first fabric structure is needle-punched and sealed with the top surface encapsulation layer 21 and the bottom surface encapsulation layer 22 of the second fabric structure respectively through a needle punching process, without sealing Combine the first fabric structure and the top surface encapsulation layer 21, leaving the top surface encapsulation layer 21 filler for standby. After the sealing in this step is completed, heat-treat the fiber threads produced by the acupuncture process and placed on the outer surface of the bottom encapsulation layer 22 to form several heat-shrinkable spherical knots, which are closely attached to the bottom encapsulation layer 22 of the outer surface. By heat-treating the fiber threads, the compactness of the fiber fabric can be further improved, and the beauty of the fabric concrete can also be ensured. In this embodiment, the first fabric layer 11 is a mesh fiber fabric layer. Preferably the reticulated fiber fabric layer is a reticulated fiber mesh. The shape of the holes on the top surface of the mesh fiber mesh cloth is preferably circular, and the holes on the top surface are arranged in a rectangular array. The diameter of the hole on the top surface can be determined according to the actual situation, which can be understood by those skilled in the art. In the present invention, the sealing can be performed by needle punching or by other methods, which can be understood by those skilled in the art.

(b-1) Preparation of cement-based material:

Calculate the ratio of each component in the cement-based material 3, weigh the cement, reinforcing component, coagulation adjusting component, anti-corrosion component, and expansion component, and carry out manual preliminary mixing under dry conditions, and then the preliminary mixing The homogeneous material is added to a dry mixer and stirred at a low speed for 2-3 minutes to obtain a dry, uniformly mixed cement-based material 3 . The required volume of the cement-based material and the fabric is calculated on the basis of the filling saturation (compactness) ≥ 98.6%. The stirring time of the mixer can be determined according to the actual situation, and those skilled in the art can understand. The parts by weight of each component in the fabric concrete are 60-75 parts of cement, 25-40 parts of modified material, and the parts by weight of each component in the modified material are 50-80 parts of reinforcing component, adjusted The condensation component is 20-40 parts, the anti-corrosion component is 0.5-5 parts, and the expansion component is 0.5-5 parts. The cement is preferably low alkalinity sulphoaluminate cement.

(c-1) Cement-based material filling

Fix the fabric as the filling carrier at the corresponding position on the vibrating table, turn on the vibrating table while the vibrating table is vibrating, take out the cement-based material 3 mixed uniformly in step (b-1), and spread it evenly on the fabric several times The reserved top surface, that is, spread on the top surface of the first fabric structure until all the cement-based materials 3 are filled. The filling of the cement-based material 3 is complete until it is dense.

(d-1) Needle-punched top surface filled with cement-based material:

After the cement-based material 3 is filled, the vibrating table is turned off and the fabric concrete is taken out, and the first fabric structure and the top surface encapsulation layer 21 are needle-punched and sealed to obtain an uncured finished fabric concrete.

In the above method for preparing fabric concrete, the order of the step (a-1) and the step (b-1) can be changed.

The present invention also provides a bridge expansion joint repair method using the above-mentioned fabric concrete, and the expansion joint repair method includes the following steps:

(a-2) Put the uncured fabric concrete into the repair groove of the expansion joint that needs to be repaired, and bond the adhesive layer 4 in the repair groove of the expansion joint, wherein the repair groove of the expansion joint is processed in advance;

(b-2) Watering the fabric concrete with a tap water pipe to form the fabric concrete to solidify;

(c-2) After the watering is completed, the repair can be completed after 0.5h-1h of maintenance, and the traffic can be opened.

The expansion joint repair method of the present invention is mainly used for the maintenance of bridge expansion joints.

Embodiment one

In this embodiment, according to the calculation and weighing of filling saturation (compactness) ≥ 98.6%, the parts by weight of each component in the fabric concrete are respectively: 65 parts by weight of low-alkalinity sulphoaluminate cement, 23 parts by weight of reinforcing components parts, 10 parts by weight of the setting component, 1 part by weight of the anti-corrosion component, and 1 part by weight of the expansion component. The uncured fabric concrete is prepared by using the above fabric concrete preparation method.

In this embodiment, after the uncured fabric concrete is obtained, the fabric concrete is placed on the test bench, watered and molded with a tap water pipe, and maintained for 40 minutes until the strength becomes stable after watering. After curing for 40 minutes, the shape, mechanical strength, wear resistance, and toughness of the fabric concrete were detected and analyzed through appearance observation and performance experiments.

The performance test results of the fabric concrete obtained according to Example 1 are shown in Table 1.

Embodiment two:

In this embodiment, according to the calculation and weighing of filling saturation (compactness) ≥ 98.6%, the parts by weight of each component in the fabric concrete are respectively: 65 parts by weight of low-alkalinity sulphoaluminate cement, 23 parts by weight of reinforcing components parts, 10 parts by weight of the setting component, 1 part by weight of the anti-corrosion component, and 1 part by weight of the expansion component. Uncured fabric concrete was prepared using the same fabric concrete preparation method as in Example 1.

In this embodiment, after the uncured fabric concrete is obtained, the fabric concrete is put into the pre-treated expansion joints, watered and formed with a tap water pipe, and repaired after 0.5h-1h of curing after watering.

The test results of fabric concrete obtained according to Example 2 are shown in Table 1.

Embodiment three

In this embodiment, according to the calculation and weighing of filling saturation (compactness) ≥ 98.6%, the parts by weight of each component in the fabric concrete are: 85 parts by weight of low-alkalinity sulphoaluminate cement, 10 parts by weight of reinforcing components parts, 3 parts by weight of the setting component, 1 part by weight of the anti-corrosion component, and 1 part by weight of the expansion component. Uncured fabric concrete was prepared using the same fabric concrete preparation method as in Example 1.

The test results of the fabric concrete obtained according to Example 3 are shown in Table 1.

Embodiment Four

In this embodiment, according to the calculation and weighing of filling saturation (compactness) ≥ 98.6%, the parts by weight of each component in the fabric concrete are respectively: 73 parts by weight of low-alkalinity sulphoaluminate cement, 18 parts by weight of reinforcing components parts, 7 parts by weight of the setting component, 1 part by weight of the anti-corrosion component, and 1 part by weight of the expansion component. Uncured fabric concrete was prepared using the same fabric concrete preparation method as in Example 1.

The test results of the fabric concrete obtained according to Example 4 are shown in Table 1.

Embodiment five

In this embodiment, according to the calculation and weighing of filling saturation (compactness) ≥ 98.6%, the parts by weight of each component in the fabric concrete are: 60 parts by weight of low-alkalinity sulphoaluminate cement, 26 parts by weight of reinforcing components parts, 12 parts by weight of the setting component, 1 part by weight of the anti-corrosion component, and 1 part by weight of the expansion component. Uncured fabric concrete was prepared using the same fabric concrete preparation method as in Example 1.

The test results of the fabric concrete obtained according to Example 5 are shown in Table 1.

Embodiment six:

In the present embodiment, according to filling saturation (compactness) ≥ 98.6%, calculate and weigh, the parts by weight of each component in the fabric concrete are respectively: 43 parts by weight of low-alkalinity sulphoaluminate cement, 35 parts by weight of reinforcing components parts, 20 parts by weight of the setting component, 1 part by weight of the anti-corrosion component, and 1 part by weight of the expansion component. Uncured fabric concrete was prepared using the same fabric concrete preparation method as in Example 1.

The test results of the fabric concrete obtained according to Example 6 are shown in Table 1.

Table 1 Test results of fabric concrete

In the present application, the weight portion of cement in the cement-based material is preferably 60-75 parts, and the weight portion of the reinforcing component and the setting adjustment component in the modified material are preferably 50-80 parts and 20-40 parts respectively, so The parts by weight of the reinforcing component and the setting-adjusting component in the cement-based material are respectively 12.5-32 parts and 5-16 parts, so in the third embodiment and the sixth embodiment, the cement, the reinforcing component and the setting-adjusting component are in None of the parts by weight in the cement-based material is within this range. In Embodiment 1 and Embodiment 2, the weight parts of cement, reinforcing component, and setting adjusting component in the cement-based material are all within the preferred range of the present application. In Example 4 and Example 5, the weight parts of cement, reinforcing component, and setting-adjusting component in the cement-based material are all within the preferred range of the present application and close to the end point of the range.

It can be seen from Table 1 that:

(1) The flexural strength, compressive strength, abrasion resistance parameters, and frost resistance grades of the fabric concrete in Examples 1, 2, 4, and 5 are all significantly better than the corresponding measurement results in Examples 3 and 6.

(2) in embodiment one, two, four, five, the initial setting time of fabric concrete is all less than 20min, and final setting time is all less than 35min; Therefore required setting time is shorter; In embodiment three, initial setting time reaches 30min, The final setting time reaches 50min, and the required setting time is longer; in Example 6, although the initial setting time and the final setting time are shorter, the impact toughness is poor and the cracking is serious.

(3) Although the parts by weight of each component in the first and second examples are the same, due to the difference in test conditions, there will be slight differences in practice, so it is a normal phenomenon.

Through the above results, it can be proved that the preferred ranges of the weight parts of cement, reinforcing components and setting-regulating components in the cement-based material given by the present invention are the optimal proportioning range.

The finished product of the fabric concrete of the invention has the characteristics of light weight, high tensile strength, good permeability, high temperature resistance, freezing resistance, aging resistance and corrosion resistance, and has excellent drainage, isolation, reinforcement, seepage prevention and protection functions.

Compared with ordinary concrete, the performance of the fabric concrete in the present invention is greatly improved, wherein the coagulation time is greatly shortened, the tensile strength and bending strength are also greatly enhanced, the impact toughness is good, and there is no delamination and no cracking phenomenon.

In the existing ultra-fast hardening concrete, it takes 2-3 hours to resume traffic. Compared with the existing expansion joint repair, the fabric concrete of the present invention can be conveniently constructed, and can be opened to traffic within 0.5h-1h after construction, and also has the advantages of high strength, high toughness, good durability, easy maintenance, flame retardancy, etc. , can achieve no jumping, low noise, wear resistance, while ensuring comfortable and safe driving. The construction scheme of watering and solidification is simple and efficient, and can meet the application requirements of various disposal projects such as bridge expansion joint maintenance, road reflection crack treatment, and pothole repair, and has important practical significance for maintaining ecological balance and achieving sustainable development.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can.

The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention, and cannot be considered as limiting the implementation scope of the present invention. All equivalent changes and improvements made according to the scope of the present invention should still belong to the scope of this patent.

Claims (10)

1. A cement-based material for repairing bridge expansion joints, characterized in that: the cement-based material (3) consists of the following components: 60-75 parts of cement, 25-40 parts of modified materials; The permanent material includes the following components: 50-80 parts of reinforcing components, 20-40 parts of coagulation regulating components, 0.5-5 parts of anti-corrosion components, and 0.5-5 parts of expansion components. 2. The cement-based material according to claim 1, characterized in that: the reinforcing component is one or more of nano-SiO2, silica fume, rubber powder, metakaolin, nano-calcium, and sodium sulfate. 3. The cement-based material according to claim 1, characterized in that: the set-adjusting component is one or more of lithium carbonate, CaCl2, boric acid, and gypsum. 4. The cement-based material according to claim 1, characterized in that: the anti-corrosion component is one or more of boron nitride, silicon phosphate, and calcium nitrite. 5. The cement-based material according to claim 1, wherein the expansion component is one or more of calcium sulfoaluminate, calcium oxide and calcium sulfoaluminate-calcium oxide. 6. A fabric concrete for repairing expansion joints of bridges, characterized in that it comprises a first fabric structure, the first fabric structure comprising two first fabric layers (11) oppositely arranged and connecting two first fabric layers A plurality of line piles (12) of the layer (11), each line pile (12) is filled with the cement-based material (3) according to any one of claims 1-5. 7. The fabric concrete according to claim 6, characterized in that: the number of the first fabric structures is at least two, and each first fabric structure is stacked; preferably, the first fabric layer (11) is mesh-shaped structure. 8. The fabric concrete according to claim 6 or 7, characterized in that: it also includes a second fabric structure for sealing and containing the first fabric structure; The fabric structure is adhered to the adhesive layer (4) in the repair groove of the expansion joint. 9. A preparation method for fabric concrete for repairing bridge expansion joints as claimed in claim 8, characterized in that, the second fabric structure consists of a top surface encapsulation layer (21) forming an integral structure, a bottom surface encapsulation layer (22) and a side encapsulation layer (23), the preparation method includes the following steps: (a-1) Seal the first fabric layer (11) of the first fabric structure with the bottom surface sealing layer (22) and the side sealing layer (23) of the second fabric structure respectively, without sealing the first fabric structure and the top encapsulation layer (21); (b-1) Cement, reinforcing components, setting-adjusting components, anti-corrosion components, and expansion components are uniformly mixed under dry conditions to obtain a dry cement-based material (3); (c-1) filling the cement-based material (3) dried in step (b-1) between each line pile (12); (d-1) After the cement-based material (3) is filled, seal the first fabric structure and the top surface encapsulation layer (21) to obtain uncured fabric concrete; The order of the step (a-1) and the step (b-1) may be reversed. 10. A method for repairing bridge expansion joints utilizing the fabric concrete described in any one of claims 6-8, characterized in that the repair method comprises the steps of: (a-2) Put the uncured fabric concrete into the repair groove of the expansion joint to be repaired; (b-2) watering the fabric concrete to cure the fabric concrete; (c-2) After watering, repair can be completed after curing for 0.5h-1h.