CN111253111A - Preparation method and use method of normal-temperature rapid repair material for asphalt pavement - Google Patents

Abstract

The invention belongs to the technical field of asphalt road repair, and particularly relates to a preparation method and a use method of a normal temperature quick repair material for an asphalt road. The preparation method of the repairing material of the present invention includes the following steps: S1: preparing asphalt; transporting the base asphalt into the asphalt tank, cooling the temperature, first turning on the stirring motor, then pumping the normal temperature modifier into the asphalt tank, stirring, placing , After testing its uniformity, mix the asphalt pavement rapid repair material at room temperature; S2: Mix the asphalt pavement rapid repair material at room temperature, heat each grade of aggregate in advance, and the mineral powder is not heated. Dry mix, then add asphalt and mix again, and mix evenly to control no white material and no segregation to obtain finished products. The asphalt pavement rapid repair material at room temperature prepared by the method of the invention is suitable for repairing various pavement repair pots and grooves, and has good repair effect, strong pressure bearing capacity and low probability of re-cracking of the asphalt pavement.

Description

Preparation method and application method of normal temperature quick repair material for asphalt pavement

technical field

The invention belongs to the technical field of asphalt road repair, and in particular relates to a preparation method of an asphalt pavement rapid repair material at room temperature, and also relates to a use method of the repair material.

Background technique

With the increase of road traffic, the increase of vehicle axle load and the increase of driving speed on high-grade highways, the roads built in accordance with traditional asphalt specifications have suffered serious initial damage. Waves, packs, cracks, potholes, looseness, etc. The early road disease has always been one of the road diseases that the highway management and maintenance department pays attention to. Among many early diseases, the road surface potholes are the top priority, especially for heavy traffic roads. Real-time management, standardization, mechanization and information automation are realized, and the timeliness and durability of daily maintenance must be reflected, which requires continuous updating of maintenance technology and maintenance materials, so that road surface diseases will not occur again in a short period of time after repairing.

At present, the materials used for pavement repair are mainly hot mix asphalt, penetrating asphalt crushed stone and cold patch, which are traditional materials in the road maintenance department. Among them, hot mix asphalt can only be used in high temperature seasons. Most of the asphalt mixing buildings that do not meet the environmental protection requirements cannot be produced normally, which seriously restricts the repairing task of the road surface. Although the quality of the hot mix asphalt mixture is guaranteed, it cannot reflect the timeliness of the daily maintenance of the road.

The penetrating asphalt crushed stone and cold refill are also slow to form the strength of the mixture due to the unstable gradation of the mixture and the long volatilization time of the cold rehydration. disease.

CN109401519A discloses a kind of asphalt pavement repairing material, which is characterized in that it is composed of A-type components and B-type components, and the A-type components are composed of the following components in parts by mass:

1-80 parts of thermosetting polymer monomer and/or thermosetting polymer prepolymer;

5-40 parts of admixture;

The B-type component is composed of the following components in parts by mass:

1-80 parts of thermoplastic polymer;

The monomer of the thermosetting polymer and/or the prepolymer of the thermosetting polymer are polymerized to obtain a thermosetting polymer; the prepolymer of the thermosetting polymer comprises a thermosetting polyurethane prepolymer, a thermosetting phenolic resin prepolymer, an unsaturated polymer One or more of ester prepolymer, furan resin prepolymer, liquid polysulfide rubber prepolymer, epoxy resin prepolymer, polyurea prepolymer, thermosetting melamine formaldehyde resin, thermosetting acrylic resin;

The monomer of the thermosetting polymer is one or more of reactive monofunctional monomers, difunctional monomers, trifunctional monomers and multifunctional monomers;

The thermoplastic polymer includes natural rubber, styrene-butadiene rubber, nitrile rubber, butadiene rubber, ethylene propylene rubber, neoprene rubber, styrene-butadiene thermoplastic elastomer, thermoplastic polyurethane elastomer, polypropylene glycol and road asphalt one or more of.

The defects of the above-mentioned patent application documents are: 1. When the storage time exceeds 3 months, the repair material becomes hard under normal temperature conditions, and the repair material needs to be heated by a heating device before it can be used, which affects the timeliness of repair; 2. Storage requirements, the bagged repair materials are required to be placed in a room with a room temperature above 10 °C, and the temperature of the repair materials is maintained, which cannot be achieved in some places in the northern region or in the humid and rainy areas.

Therefore, inventing a new material that can not only realize the timeliness of daily maintenance but also increase the durability of the road surface has always been an urgent problem to be solved in the field of highway maintenance.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problem, the present invention provides a preparation method of an asphalt pavement rapid repair material at room temperature; the method solves the problem in the existing method that the repair material becomes hard due to storage and affects the repair timeliness;

The present invention also provides a method for using the above-mentioned quick repairing material for asphalt pavement at room temperature;

In view of the problems mentioned in the background art, on the basis of the analysis and summary of the previous daily maintenance materials, the inventors carried out different dosage tests of the normal temperature modifier in the normal temperature modified asphalt mixture, and finally determined the normal temperature of the asphalt pavement. The optimum amount of modifier for quick repair materials, so that the mixture can be stored at room temperature for more than 3 months and still has good workability, and the repaired pavement potholes have no new diseases for 2-3 years. Increase the durability of the road surface and save about 15% of the road maintenance funds.

The preparation method of the normal temperature quick repair material for asphalt pavement provided by the present invention comprises the following steps:

S1: Preparation of Asphalt

Transfer the base asphalt into the asphalt tank, cool it down, turn on the stirring motor first, then pump the normal temperature modifier into the asphalt tank, stir, place, and after testing its uniformity is qualified, mix the asphalt pavement rapid repair material at room temperature;

S2: mixing

Mixing asphalt pavement rapid repair material at room temperature, heating each grade of aggregate in advance, and not heating mineral powder. When mixing, dry-mix each grade of aggregate and mineral powder first, then add asphalt and mix, and mix evenly to control no white material and no segregation. , to get the finished product.

Preferably, in S1, the base asphalt is transported into the asphalt tank to reduce the temperature to 100-120 °C, the stirring motor is turned on first, and then the normal temperature modifier is pumped into the asphalt tank, and stirred for 60-120 minutes, keeping the asphalt temperature at 110 ~ 120 ℃, placed for 40 ~ 60min, after testing the uniformity, mix the asphalt pavement rapid repair material at room temperature;

Store finished products in packaging bags;

Preferably, the packaging bag in which the finished product is placed is a plastic cloth inner bag, a layer of woven bag and a layer of kraft paper outer bag, each bag is filled with 24-26kg, and the mouth is tightly sealed to isolate the air; when stacking, it is controlled within two layers, and the packaging is The surface of the bag is tightly covered with waterproof insulating cotton cloth.

In S1, the temperature of the base asphalt is less than or equal to 120°C when adding the modifier at room temperature.

The bitumen stored in the bitumen tank is less than or equal to 2/3 of its volume.

Asphalt tanks are located away from sources of ignition or smoking.

In S2, an asphalt mixing building or a cement mixer is used to mix the asphalt pavement rapid repair material at room temperature.

Mixing asphalt pavement rapid repair materials at room temperature, heat each grade of aggregate to above 50℃ in advance, and do not heat the mineral powder. When mixing, dry each grade of aggregate and mineral powder with a temperature greater than or equal to 50℃ for 10s, and then add asphalt For re-mixing, the total mixing time shall not be less than 120s. When using asphalt mixing floor for mixing, the total mixing time shall not be less than 60s. The mixing shall be uniformly controlled with no white material and no segregation, and the finished product shall be obtained. The temperature of the mixed repair material of the finished product shall be 30～ 50°C.

Preferably, in S1, when adding the modifier, avoid open fire or smoke around, and prepare fire prevention facilities;

Preferably, the temperature of the stone is greater than or equal to 80°C, the temperature of the asphalt is greater than or equal to 100°C, the finished material is greater than or equal to 50°C and there is no whitening material therein;

Preferably, the finished mixed repair material is bagged immediately after the mixing is completed, and the bag is made of one layer of inner film and two layers of woven bag, and the inner film and the woven bag are respectively tied;

Preferably, when the finished mixed repair material is stored, it is stored indoors at a temperature greater than or equal to 20°C;

Preferably, when the finished mixed repair material is used, it is used after heating for 15-25 minutes to eliminate;

Preferably, the dosage of the modifier is 13% of the mass of the asphalt, and the dosage of the modifier during long-term storage is 25% of the mass of the bitumen.

The use method of the above-mentioned asphalt pavement rapid repair material at room temperature is characterized in that:

The loose paving coefficient of the mixed repair material is 1.3 to 1.4. When using, the mixed material should be taken out of the storage room in advance and dried for 1 to 2 hours;

Cut the pavement potholes into squares or rectangles, thoroughly clean up the sundries in the potholes, use a blower to blow the potholes to a dry state, spread the emulsified asphalt, and fill the mixture after the emulsified asphalt breaks. When it is larger than 4cm, it is filled in layers, and the thickness of each layer is not more than 4cm;

After the filling is completed, immediately level and compact, and after compaction, it is 2-3mm higher than the original road surface;

After forming, clean the gaps on the four sides of the pit, pour emulsified asphalt, leave 1-2cm on the top of the gap, fill in machine-made sand or stone chips, and open for traffic.

The beneficial effect of the present invention lies in that the asphalt pavement rapid repairing material at room temperature prepared by the method of the present invention is suitable for repairing various pavement repair pots and grooves, and has good repairing effect, strong bearing capacity, and the probability of cracking of the asphalt pavement again. Low.

Detailed ways

In order to further illustrate the present invention, the present inventor will describe the present invention in detail through the following specific examples, but the present invention is not limited thereto.

Example 1

The preparation method of the normal temperature quick repair material for asphalt pavement comprises the following steps:

In S1, the base asphalt is transported into the asphalt tank to reduce the temperature to about 110 °C, the stirring motor is turned on first, and then the normal temperature modifier is pumped into the asphalt tank (when adding the normal temperature modifier, the temperature of the asphalt should not exceed 120 °C ℃), stir for 90min, keep the asphalt temperature at 115℃, and leave it for 50min. After testing its uniformity, mix the asphalt pavement rapid repair material at room temperature; keep the asphalt stored in the asphalt tank should not exceed 2/3 of its volume, the operator It should be kept away from the mouth of the asphalt tank to avoid the asphalt spraying out of the tank and scalding the operator; it is strictly forbidden to set fire sources near the asphalt tank during operation, and smoking is prohibited.

S2: mixing

Mixing asphalt pavement rapid repair materials at room temperature, heat each grade of aggregate to above 50℃ in advance, and do not heat the mineral powder. When mixing, dry each grade of aggregate and mineral powder with a temperature greater than or equal to 50℃ for 10s, and then add asphalt For re-mixing, the total mixing time shall not be less than 120s. When using asphalt mixing floor mixing, the total mixing time shall not be less than 60s. The mixing shall be uniformly controlled with no white material and no segregation, and the finished product shall be obtained. The temperature of the mixed repair material for the finished product shall be 40°C. about.

store:

After the asphalt pavement rapid repair material is mixed at room temperature, it should be stored in a bag in time, and cannot be placed in the air for a long time, so as to prevent the chemical substances in the modifier from reacting with CO ₂ in the air and affecting the workability of the mixture. When stored indoors, the indoor temperature should not be lower than 20°C. The packaging bags used to package the asphalt pavement rapid repair materials at room temperature must use 1 plastic cloth inner bag, 1 layer of woven bag and 1 layer of kraft paper outer bag, and each bag is filled with 25kg Left and right, the seal should be tight, try to isolate the air. The packaged asphalt pavement quick repair materials at room temperature should be stored in the house, and should not be stacked in more than 2 layers to avoid the difficulty of compaction and paving. The surface of the packaging bag should be tightly covered with waterproof and thermal insulation cotton cloth.

The usage method of the normal temperature quick repair material for asphalt pavement is as follows:

Asphalt pavement rapid repair material at room temperature is suitable for repairing various pavement pits and grooves. The construction process is basically the same as that of traditional hot mix asphalt mixture. The difference is that the loose paving coefficient is different. When using, take out the mixture from the storage room in advance, let it dry for 1-2 hours, cut the pavement pits into squares or rectangles, clean the sundries in the pits thoroughly, and use a hair dryer to blow the pits to a dry state. , sprinkle emulsified asphalt until the emulsified asphalt breaks, and then fill the mixture. When the depth of the pit is greater than 4cm, it should be filled in layers, and the thickness of each layer should not be greater than 4cm. The original pavement is 2-3mm. After forming, clean the gaps on the four sides of the pothole and pour in emulsified asphalt. Leave 1-2cm on the top surface of the gap. When machine-made sand or stone chips are filled, traffic can be opened.

In the process of preparation and use of the repair material of the present invention, it should be carried out according to the requirements:

The aggregate strength, soft emulsion particle content, single-grade gradation, rotating flake content, and passing rate of less than 0.075mm used in the rapid repairing materials for asphalt pavement at room temperature are the source of quality control. When selecting aggregates, the above technical indicators should be monitored. , to ensure that the technical indicators are qualified before use.

(1) Add the modifier at room temperature in strict accordance with the set mixing ratio, and check whether the mixing ratio of the mixture is correct when mixing. If the aggregate changes, the mixing ratio should be re-adjusted;

(2) During mixing, various temperatures and material weighing should be controlled accurately, and the deviation should be controlled within the minimum range to ensure the workability of the mixture;

(3) The uniformity of the mixture should be observed at any time during mixing, and there should be no white material, and the mixture should be immediately bagged and stored when the temperature of the mixture is suitable;

(4) When repairing potholes, strictly follow the requirements of asphalt pavement construction technical specifications. When tamping, manual finishing of surface gaps should be used to ensure compactness.

The long-term monitoring system should be established for the road sections and potholes repaired by the quick repairing materials of the asphalt pavement at room temperature.

Also during preparation and use, it should also ensure that:

(1) The heating temperature of ordinary asphalt should not be higher than 120℃, add modifier and stir evenly;

(2) When adding modifier, there should be no open fire or smoking around, and fire prevention facilities (fire sand, fire extinguisher, quilt, etc.) should be prepared;

(3) All kinds of stone materials are heated to about 100 ℃ in advance for use;

(4) During mixing, the temperature of the stone material shall not be lower than 80℃, the temperature of the asphalt shall not be lower than 100℃, and the finished material shall not be lower than 50℃, and there shall be no white material;

(5) Immediately after the mixing of the finished materials is completed, the bag is packed with one layer of inner film and two layers of woven bag, and the inner film and the woven bag are respectively tied.

(6) When using, if there is agglomeration, it can be heated in the heater for 20 minutes, and then it can be used; for example, the mixing amount of the modifier is 13% of the asphalt mass, and the modifier is mixed with the modifier during long-term storage. The amount is 25% of the asphalt mass.

Example 2

In S1, the base asphalt is transported into the asphalt tank to reduce the temperature to 100 °C, firstly turn on the stirring motor, then pump the normal temperature modifier into the asphalt tank, stir for 60 minutes, keep the asphalt temperature at 110 °C, leave it for about 40 minutes, After testing its uniformity, mix the asphalt pavement quickly repairing materials at room temperature;

S2: Mixing asphalt pavement rapid repair materials at room temperature, heat each grade of aggregate to above 50°C in advance, and do not heat the mineral powder. When mixing, dry each grade of aggregate and mineral powder with a temperature greater than or equal to 50°C for 10s first, and then Add asphalt and then mix, the total mixing time should not be less than 120s, when using asphalt mixing floor mixing, the total mixing time should not be less than 60s, mixing uniformly control no white material, no segregation, to obtain the finished product, the temperature of the finished product mixed repair material is around 40°C.

The packaging bag for the finished product is a plastic cloth inner bag, a layer of woven bag and a layer of kraft paper outer bag, each bag is about 25kg, tightly sealed to isolate the air; when stacking, it is controlled within two layers, and the surface of the packaging bag is waterproof Insulation cotton cover tightly.

The use method in embodiment 2 is the same as that in embodiment 1.

Example 3

In S1, the base asphalt is transported into the asphalt tank to reduce the temperature to 120°C, firstly turn on the stirring motor, then pump the normal temperature modifier into the asphalt tank, stir for 60min, keep the asphalt temperature at about 120°C, and leave it for about 40min , After testing its uniformity, mix the asphalt pavement quickly repairing materials at room temperature;

S2: Mixing asphalt pavement rapid repair materials at room temperature, heat each grade of aggregate to above 50°C in advance, and do not heat the mineral powder. When mixing, dry each grade of aggregate and mineral powder with a temperature greater than or equal to 50°C for 10s first, and then Add asphalt and then mix, the total mixing time should not be less than 120s, when using asphalt mixing floor mixing, the total mixing time should not be less than 60s, mixing uniformly control no white material, no segregation, to obtain the finished product, the temperature of the finished product mixed repair material is around 40°C.

When the finished mixed repair material is stored, it should be stored indoors, and the temperature is greater than or equal to 20 °C; Tightly seal the mouth to isolate the air; control it within two layers when stacking, and cover the surface of the packaging bag tightly with waterproof and thermal insulation cotton.

The use method in embodiment 3 is the same as that in embodiment 1.

On-site repairing time, after the excavation of the diseased pits and grooves is completed, after calculating the number, the repairing materials are directly placed into the diseased places by hand, and they are compacted and edged immediately after simple leveling. Generally, the repair work of about 5 square meters can be completed within 20 minutes.

Table 1 Test results of storable normal temperature modified asphalt mixture

It can be seen from the data in the above table that the repair material in the present invention is ideal in terms of compactness, water permeability coefficient, flatness and friction coefficient.

Claims (10)

1. The preparation method of the normal-temperature rapid repair material for the asphalt pavement comprises the following steps:

s1: preparation of bitumen

Conveying the matrix asphalt into an asphalt tank, cooling, starting a stirring motor, pumping a normal-temperature modifier into the asphalt tank, stirring, placing, and mixing the asphalt pavement normal-temperature quick repair material after detecting that the uniformity of the asphalt is qualified;

s2: mixing of

Mixing the aggregates of different grades and the mineral powder, dry-mixing the aggregates of different grades and the mineral powder, adding asphalt, mixing, and uniformly mixing to control no white material and no segregation to obtain the finished product.

2. The preparation method of the normal-temperature rapid asphalt pavement patching material as claimed in claim 1, which is characterized by comprising the following steps:

s1, conveying the matrix asphalt into an asphalt tank, reducing the temperature to 100-120 ℃, starting a stirring motor, pumping a normal-temperature modifier into the asphalt tank, stirring for 60-120 min, keeping the temperature of the asphalt at 110-120 ℃, standing for 40-60 min, detecting that the uniformity is qualified, and then mixing the normal-temperature rapid repair material for the asphalt pavement.

3. The preparation method of the normal-temperature rapid asphalt pavement patching material as claimed in claim 1, which is characterized by comprising the following steps:

packaging the finished product into a packaging bag for storage;

preferably, the packaging bags for containing the finished products are an inner plastic cloth bag, a layer of woven bag and a layer of kraft paper outer bag, each bag is filled with 24-26 kg of materials, and the bags are tightly sealed to isolate air; the stacking is controlled within two layers, and the surface of the packaging bag is tightly covered by waterproof heat-insulating cotton cloth.

4. The preparation method of the normal-temperature rapid asphalt pavement patching material as claimed in claim 1, which is characterized by comprising the following steps:

in S1, the temperature of the base asphalt is less than or equal to 120 ℃ when the normal temperature modifier is added.

5. The preparation method of the normal-temperature rapid asphalt pavement patching material as claimed in claim 1, which is characterized by comprising the following steps:

the asphalt tank stores less than or equal to 2/3 of its volume.

6. The preparation method of the normal-temperature rapid asphalt pavement patching material as claimed in claim 1, which is characterized by comprising the following steps:

the asphalt tank is located at a location remote from the fire source or the location where the smoke is drawn.

7. The preparation method of the normal-temperature rapid asphalt pavement patching material as claimed in claim 1, which is characterized by comprising the following steps:

and S2, mixing the normal-temperature quick repair material with asphalt mixture plant or cement mixer.

8. The preparation method of the normal-temperature rapid asphalt pavement patching material as claimed in claim 1, which is characterized by comprising the following steps:

s2: the method comprises the steps of mixing the aggregates at a normal temperature to 50 ℃ in advance, heating the aggregates at all grades to 50 ℃ in advance, not heating mineral powder, mixing the aggregates at the temperature of 50 ℃ and the mineral powder for 10 seconds in a dry mode, adding asphalt, mixing, wherein the total mixing time is not less than 120 seconds, mixing by using an asphalt mixing plant, the total mixing time is not less than 60 seconds, uniformly mixing, controlling no white material and no segregation, and obtaining a finished product, wherein the temperature of the finished product mixed repairing material is 30-50 ℃.

9. The preparation method of the normal-temperature rapid asphalt pavement patching material as claimed in claim 1, which is characterized by comprising the following steps:

in S1, when a modifier is added, open fire or smoke is avoided around, and fireproof facilities are prepared;

preferably, the stone temperature is greater than or equal to 80 ℃, the asphalt temperature is greater than or equal to 100 ℃, the finished material is greater than or equal to 50 ℃ and no white material exists;

preferably, the finished mixed repairing material is bagged immediately after being stirred, the bag is formed by a layer of inner film and two layers of woven bags, and the inner film and the woven bags are respectively tied;

preferably, the finished mixed repairing material is stored indoors at the temperature of more than or equal to 20 ℃ when being stored;

preferably, the finished product mixed repairing material is heated for 15-25 min to be eliminated when in use;

preferably, the mixing amount of the modifier is 13% of the mass of the asphalt, and the mixing amount of the modifier is 25% of the mass of the asphalt during long-term storage.

10. The use method of the normal-temperature rapid asphalt pavement patching material as claimed in claim 1, is characterized in that:

the loose coefficient of the mixed repairing material is 1.3-1.4, and when the mixed repairing material is used, the mixed material is taken out from a storage chamber in advance and aired for 1-2 hours;

cutting pavement pits into squares or rectangles, thoroughly cleaning up sundries in the pits, blowing the pit area to a dry state by using a blower, spreading emulsified asphalt until the emulsified asphalt is demulsified and then filling the mixture, filling the mixture in layers when the depth of the pits is more than 4cm, and keeping the thickness of each layer to be not more than 4 cm;

after filling, immediately leveling and tamping, wherein the height of the tamped;

and after forming, cleaning gaps on four sides of the pit groove, pouring emulsified asphalt, reserving 1-2 cm of gaps on the top surface of the gaps, filling machine-made sand or stone chips, and opening traffic.