CN111334248B - Asphalt pavement crack repairing pretreatment liquid and preparation method and application thereof - Google Patents

Asphalt pavement crack repairing pretreatment liquid and preparation method and application thereof Download PDF

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CN111334248B
CN111334248B CN202010321871.9A CN202010321871A CN111334248B CN 111334248 B CN111334248 B CN 111334248B CN 202010321871 A CN202010321871 A CN 202010321871A CN 111334248 B CN111334248 B CN 111334248B
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coupling agent
crack
asphalt
stirring
parts
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CN111334248A (en
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王向刚
贾坚
辛星
周鑫鑫
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China National Chemical Communications Construction Group Coltd
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China National Chemical Communications Construction Group Coltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J191/00—Adhesives based on oils, fats or waxes; Adhesives based on derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/02—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving pretreatment of the surfaces to be joined
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/09—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges
    • E01C23/0966—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for filling or priming, with or without working the surface of the filling or applying particulate material thereto, e.g. for filling the joints of stone-sett paving
    • E01C23/0973—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for filling or priming, with or without working the surface of the filling or applying particulate material thereto, e.g. for filling the joints of stone-sett paving with liquid or semi-liquid materials, e.g. crack sealants

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Repair (AREA)
  • Road Paving Structures (AREA)

Abstract

The invention relates to a pretreatment liquid for repairing asphalt pavement cracks, a preparation method and application thereof, which are mainly applied to longitudinal or transverse cracks generated in the use process of asphalt pavements and are also suitable for the joint treatment of newly paved pavements and original pavements in the reconstruction and expansion process of asphalt pavements. The pretreatment liquid comprises coupling agent hydrolysate and an organic solvent containing furfural extract oil. The interface binding power of the asphalt pavement is greatly improved by pretreating the cracks of the asphalt pavement. The application of the pretreatment liquid in repairing the cracks of the asphalt pavement comprises the following steps: (1) performing joint cutting treatment and cleaning on the crack; (2) spraying the cracks cleaned in the step (1) with a pretreatment solution, and performing crack pouring construction by using an asphalt crack pouring material; and (5) carrying out molding maintenance after the crack pouring is finished. The invention has important significance for reducing the secondary damage of the asphalt pavement, reducing the maintenance cost and prolonging the service life, and has guiding effect on the maintenance of the asphalt pavement.

Description

Asphalt pavement crack repairing pretreatment liquid and preparation method and application thereof
Technical Field
The invention relates to asphalt pavement crack repair, belongs to the technical field of road maintenance construction, and particularly relates to asphalt pavement crack repair pretreatment liquid as well as a preparation method and application thereof.
Background
The cracks of the asphalt pavement are one of the most easily-generated and most common diseases in the highway, if the cracks are not treated in time, surface water can seep downwards along the cracks to damage the overall structure of the pavement, the cracks are repaired by using crack pouring glue in a commonly-used maintenance mode at present, and the crack pouring materials mainly comprise the following three types: hot asphalt crack pouring glue, emulsified asphalt crack pouring glue and special crack pouring materials, but the existing crack pouring materials have poor binding power with the original asphalt mixture, and usually crack occurs after the crack pouring materials are used for a period of time.
The reason why the asphalt pavement cracks and cracks easily after crack pouring is mainly that the crack pouring material is organic material, and the stone material interface exposed by cracking is inorganic material, so that the organic-inorganic interface effect causes insufficient binding power. Particularly for granite asphalt pavement, the aggregate is acidic, which results in poor cementation at the cementation of fissures and cracks again after a period of repair. Although the special crack repairing material has good pavement performance, the special crack repairing material is expensive and is not suitable for large-area application.
Chinese patent 103758009a (201310748076.8) discloses a method for rapidly repairing an asphalt pavement crack, in which emulsified asphalt is coated on the wall of a crack groove to increase the adhesion between a repair material and the crack in the process of repairing the asphalt pavement crack, and in this way, only the adhesion between the asphalt and the repair material is increased, i.e., an organic-organic interface is increased, but the adhesion between the repair material and aggregate (i.e., an organic-inorganic interface) exposed in the crack is not increased, and is particularly obvious for a granite pavement.
Chinese patent 103758008A (201310720054.0) discloses a method for repairing cracks in asphalt pavement by using asphalt rubber, which comprises cleaning cracks, heating the surface of the cracks, and extruding asphalt rubber strips into crack-filling grooves. The repairing method does not directly adopt measures to enhance the bonding force between the new interface and the old interface, and the construction difficulty is higher when the crack is heated. The overall repair method is also not conducive to long-term service performance after asphalt pavement.
Therefore, in the existing pavement repair construction method, the repair material is basically directly constructed and poured into the pavement crack, and the direct interface treatment mode of the crack pouring material and the inner wall of the pavement crack is less considered.
Disclosure of Invention
The invention provides a pretreatment liquid and a preparation method and application thereof, aiming at solving the problem of weak binding force between a crack pouring material and original asphalt due to the existence of an organic-inorganic interface between an aggregate interface and the crack pouring material in the prior art. According to the asphalt pavement treated by the pretreatment liquid and then subjected to crack pouring, the bonding force between the asphalt crack pouring material and the original asphalt crack interface can be obviously enhanced, and the service life of the asphalt pavement is prolonged; the preparation and construction process of the pretreatment liquid is simple, and the pretreatment liquid is suitable for field maintenance and repair of asphalt pavements; the pretreatment liquid material has low production cost, reduces the construction maintenance cost, and is suitable for large-scale popularization and use.
In order to achieve the purpose, the invention adopts the following technical scheme:
the pretreatment liquid for repairing the cracks of the asphalt pavement is characterized by comprising coupling agent hydrolysate and an organic solvent containing furfural extract oil.
Preferably, the mass percentage of the coupling agent in the coupling agent hydrolysate is 10-25%; the mass percentage of the furfural extract oil in the organic solvent is 60-75%.
Further preferably, the mass ratio of the coupling agent hydrolysate to the organic solvent is 1.5-4: 98.5-96.
Preferably, the coupling agent hydrolysate is silane coupling agent hydrolysate, and preferably silane coupling agent KH550 hydrolysate.
Further preferably, the coupling agent hydrolysate comprises the following components in parts by mass: 15-30 parts of silane coupling agent KH550, 15-30 parts of water and 85-75 parts of ethanol.
The ethanol is used for promoting the hydrolysis of the silane coupling agent KH 550; other kinds of silane coupling agents can also be used to prepare the pretreatment liquid of the present invention, but due to their high pH requirement for hydrolysis conditions, such as KH 570: when the pH value is 3-5, the hydrolysis is more complete, and the process difficulty and the cost are increased.
Further preferably, the organic solvent comprises the following components in parts by mass: 75-60 parts of furfural extract oil and 25-40 parts of ethanol.
Preferably, the organic solvent further comprises 0.1-1 part of a defoaming agent, wherein the defoaming agent is a modified polyether defoaming agent and has the function of eliminating bubbles generated in the stirring process.
Further preferably, the purity of the coupling agent KH550 is more than 98%; the concentration of ethanol is more than 90 percent; the water is deionized water.
Further preferably, the mass ratio of the coupling agent hydrolysate to the organic solvent is 2: 98.
One end of the hydrolyzed silane coupling agent can form a chemical bond with limestone or granite, and the other end of the hydrolyzed silane coupling agent is combined with asphalt to generate a reactive group, so that the adhesive force of an inorganic-organic interface is increased to a certain extent; the furfural extract oil can increase the binding power between the organic contact surfaces of the original asphalt and the crack pouring material and the continuity of a transverse interface to a certain extent, and relieve the stress and strain generated when a vehicle runs on the upper surface. According to the invention, the pretreatment liquid is compounded with the silane coupling agent hydrolysate and the furfural extract oil diluent, so that the binding power of the pretreatment liquid is obviously improved in a specific proportion, and the asphalt crack pouring material can be well bound with the original asphalt.
The invention also provides a preparation method of the pretreatment liquid, which is characterized by comprising the following steps:
(1) preparation of coupling agent hydrolysate: mixing a silane coupling agent KH550, deionized water and ethanol according to a formula ratio, stirring and hydrolyzing;
(2) preparation of organic solvent: adding ethanol into the furfural extract oil according to a formula ratio, stirring to uniformly mix the ethanol and the furfural extract oil, adding a defoaming agent, and continuously stirring to eliminate bubbles generated in the stirring process;
(3) adding the coupling agent hydrolysate into the organic solvent according to the formula proportion, and stirring and mixing to obtain the pretreatment solution.
Preferably, magnetic stirring is adopted in the step (1), and the stirring time is 30-40 min; stirring by using a stirrer in the step (2), wherein the stirring time is 120-180 s; the continuous stirring time is 60-120 s.
Preferably, a stirrer is adopted for stirring in the step (3), and the stirring time is 60-120 s.
The invention also provides application of the pretreatment liquid in repairing asphalt pavement cracks, which is characterized by comprising the following steps:
(1) performing joint cutting treatment and cleaning on the crack;
(2) spraying the cracks cleaned in the step (1) with a pretreatment solution, and performing crack pouring construction by using an asphalt crack pouring material; and (5) carrying out molding maintenance after the crack pouring is finished.
The pitch is subjected to joint cutting treatment, so that the original pitch interface is regular in shape and convenient to clean.
Preferably, the spraying slit of the pretreatment liquid is a position where the side and bottom surfaces of the spraying slit can be contacted by the potting material.
Preferably, the amount of the pretreatment liquid sprayed per square meter of the sprayed surface (the side surface and the bottom surface of the crack) is 0.5 to 0.7kg/m2. More preferably 0.6kg/m2。
The time for forming and curing can be selected by those skilled in the art according to the type of the crack pouring material. For example, the curing time of the heating type asphalt crack pouring material is 2-3 hours.
A method for repairing the crack of asphalt pavement features that before the crack is filled, a pre-treating liquid for promoting the adhesion between the crack interface of asphalt and the material for filling the crack is sprayed to the crack.
The invention mainly increases the binding force between organic-inorganic interfaces through the pretreatment liquid. Because the common aggregate of the mixture is limestone and granite is only in the regions with large granite content such as coastal areas, the principle that the coupling agent KH550 enhances the organic-inorganic interfaces of the limestone asphalt mixture and the granite asphalt mixture is respectively explained as follows:
(1) hydrolysis principle of silane coupling agent KH 550:
H2N(CH2)3Si(OCH3)3+H2O＝H2N(CH2)3Si(OH)3+CH3OH；
(2) the principle of the pretreatment liquid for enhancing the interface bonding force of the crack pouring material-the original limestone asphalt mixture is as follows: the limestone comprises CaCO as main ingredient3Having OH on the surface-Hydrolysis of one end of the silane coupling agent (Si- (OH)3) Can form chemical bond with limestone surface, and the other end R group (H)2N(CH2)3) The reactive groups are generated by combining with the asphalt, so that the interfacial adhesion is increased, and the asphalt potting material and the limestone can be better bonded. The principle is shown in fig. 1.
The principle of the pretreatment liquid for enhancing the interfacial bonding force of the crack pouring material-the original granite asphalt mixture is as follows: granite SiO2The hydrolyzed silane coupling agent can form Si-O-Si bonds on the surface of the asphalt and can be combined with asphalt to generate reactive groups, so that the interfaces of the asphalt and granite with larger performance difference can be improved, the binding power of the asphalt and granite is enhanced, and the pavement performance of the granite asphalt pavement is improved. The schematic diagram is shown in fig. 2.
One or more technical solutions provided by the embodiments of the present invention have at least the following technical effects:
the invention provides a pretreatment liquid for repairing asphalt pavement cracks and a construction method thereof, which increase the direct interface bonding force of a repairing material and original cracks thereof and prolong the service life of roads. The asphalt pavement which is treated by the pretreatment liquid and then subjected to crack pouring treatment can obviously enhance the bonding force between the asphalt crack pouring material and the original asphalt crack interface and improve the service life of the asphalt pavement; the preparation and construction process of the pretreatment liquid is simple, and the pretreatment liquid is suitable for field maintenance and repair of asphalt pavements; the pretreatment liquid material has low production cost, reduces the construction cost of engineering maintenance and is suitable for large-scale popularization and use. The pretreatment liquid of the invention does not need to be prepared on site, and can be stored and transported more conveniently.
Drawings
FIG. 1 is a schematic diagram of a coupling agent pretreatment fluid enhanced limestone interface mechanism;
FIG. 2 is a schematic diagram of a coupling agent pretreatment fluid for enhancing granite interface mechanism.
Detailed Description
The invention is further illustrated by the following examples:
example 1:
preparing coupling agent hydrolysate: mixing 25 parts of silane coupling agent KH550, 75 parts of ethanol and 25 parts of deionized water, and magnetically stirring for 35 min.
Preparing an organic mixed solvent of furfural extract oil: adding 35 parts of ethanol into 65 parts of furfural extract oil, and stirring for 160s by using a stirrer; then, 0.5 part of an antifoaming agent was added, and stirring was continued for 90 seconds.
Finally, 2 parts of coupling agent hydrolysate is added into 98 parts of organic diluent solvent, and the mixture is stirred for 90 seconds to obtain the asphalt pavementA crack repairing pretreatment liquid. Spraying on the surface of the crack before crack pouring, wherein the spraying amount is 0.6kg/m2。
The crack pouring material is No. 70 road petroleum asphalt, and the indexes of the crack pouring material meet the specification requirements of technical Specifications for road asphalt pavement construction (JTG F40-2004).
Example 2:
preparing coupling agent hydrolysate: mixing 15 parts of silane coupling agent KH550, 85 parts of ethanol and 15 parts of deionized water, and magnetically stirring for 35 min.
Preparing an organic solvent: adding 25 parts of ethanol into 75 parts of furfural extract oil, and stirring for 160s by using a stirrer; then, 0.1 part of an antifoaming agent was added, and stirring was continued for 90 seconds.
The other steps are the same as in example 1.
Example 3:
preparing coupling agent hydrolysate: 30 parts of silane coupling agent KH550, 75 parts of ethanol and 30 parts of deionized water are mixed, and the mixture is magnetically stirred for 35 min.
Preparing an organic solvent: adding 40 parts of ethanol into 60 parts of furfural extract oil, and stirring for 160s by using a stirrer; then, 1 part of an antifoaming agent was added, and stirring was continued for 120 seconds.
The other steps are the same as in example 1.
Example 4:
preparing coupling agent hydrolysate: 30 parts of silane coupling agent KH550, 75 parts of ethanol and 30 parts of deionized water are mixed, and the mixture is magnetically stirred for 35 min.
Preparing an organic solvent: adding 40 parts of ethanol into 60 parts of furfural extract oil, and stirring for 160s by using a stirrer; then, 1 part of an antifoaming agent was added, and stirring was continued for 120 seconds.
And finally, adding 4 parts of coupling agent hydrolysate into 96 parts of organic diluent solvent. The other steps are the same as in example 1.
Example 5:
the ethanol in the organic solvent was replaced with diesel oil, and the rest was the same as in example 1.
Comparative example 1:
preparing coupling agent hydrolysate: 30 parts of silane coupling agent KH550, 75 parts of ethanol and 30 parts of deionized water are mixed, and the mixture is magnetically stirred for 35 min.
Preparing an organic solvent: adding 40 parts of ethanol into 60 parts of furfural extract oil, and stirring for 160s by using a stirrer; then, 1 part of an antifoaming agent was added, and stirring was continued for 120 seconds.
And finally, adding 5 parts of coupling agent hydrolysate into 95 parts of organic diluent solvent. The other steps are the same as in example 1.
Comparative example 2:
preparing coupling agent hydrolysate: 5 parts of silane coupling agent KH550, 95 parts of ethanol and 5 parts of deionized water are mixed, and the mixture is magnetically stirred for 35 min.
The organic solvent and asphalt pavement crack repair pretreatment steps are the same as in example 1.
Comparative example 3:
preparing coupling agent hydrolysate: 50 parts of silane coupling agent KH550, 50 parts of ethanol and 50 parts of deionized water are mixed, and the mixture is magnetically stirred for 35 min.
The organic solvent and asphalt pavement crack repair pretreatment steps are the same as in example 1.
Comparative example 4:
the preparation of the organic solvent comprises the following steps: the organic solvent is selected from furfural extract oil, 0.5 part of antifoaming agent is added into 100 parts of furfural extract oil, and stirring is carried out for 160 s.
The steps of the coupling agent aqueous solution and the asphalt pavement crack repairing pretreatment are the same as those of the example 1.
Comparative example 5:
the raw materials used in mass fraction and the asphalt pavement crack repair pretreatment steps were the same as in example 1, except that all the raw materials were mixed together and stirred for 39min when the pretreatment liquid was prepared.
Comparative example 6:
the proportions of the aqueous coupling agent solution and the organic solvent were the same as in example 1. The difference is that: the spraying amount of the pretreatment liquid was 0.3kg/m2。
Comparative example 7:
preparing coupling agent hydrolysate: mixing 25 parts of silane coupling agent KH550, 75 parts of ethanol and 25 parts of deionized water, and magnetically stirring for 35 min.
And finally, adding 2 parts of coupling agent hydrolysate into 98 parts of ethanol solvent, and stirring for 90 seconds to obtain the asphalt pavement crack repairing pretreatment liquid. Spraying on the surface of the crack before crack pouring, wherein the spraying amount of the pretreatment liquid is 0.6kg/m2。
The crack pouring material is No. 70 road petroleum asphalt, and the indexes of the crack pouring material meet the specification requirements of technical Specifications for road asphalt pavement construction (JTG F40-2004).
Comparative example 8:
preparing an organic solvent: adding 35 parts of ethanol into 65 parts of furfural extract oil, and stirring for 160s by using a stirrer; then, 0.5 part of an antifoaming agent was added, and stirring was continued for 90 seconds.
Spraying the organic solvent on the crack surface before crack pouring with a spraying amount of 0.6kg/m2。
The crack pouring material is No. 70 road petroleum asphalt, and the indexes of the crack pouring material meet the specification requirements of technical Specifications for road asphalt pavement construction (JTG F40-2004).
Comparative example 9: the crack pouring is directly carried out by using a crack pouring material without using any pretreatment liquid, and the crack pouring conditions are the same as those of the example 1.
Test example:
1. cementation test of crack pouring material
The crack repairing effect is detected by adopting the low-temperature tensile property in pavement heating type sealant JT/T740-2015, the difference is that a test block adopts a cut asphalt mixture test block (mixture SMA-13), a tensile device adopts an MTS universal tester, and the performance of a test piece is measured as follows:
after 3 stretching circulation processes, the test piece is taken out of the tensile testing machine within 30min, whether cracks appear on the test piece, the interface of the test piece and the asphalt mixture test block or not is immediately checked, and the length of the cracks is measured. The test results are shown in table 1.
TABLE 1 cementation force test results of crack sealing materials
Serial number Crack length (mm)
Example 1 ＜1.0
Example 2 2.5
Example 3 2.1
Example 4 2.4
Example 5 2.4
Comparative example 1 3.2
Comparative example 2 6.1
Comparative example 3 10.6
Comparative example 4 3.0
Comparative example 5 6.9
Comparative example 6 6.7
Comparative example 7 3.4
Comparative example 8 8.1
Comparative example 9 8.4
2. Repairing road conditions one year after pavement cracks
The pretreatment liquid is applied to pavement crack repair, and the condition of the asphalt pavement for crack repair by using the pretreatment method is as follows: the operation time is 8-10 years; the pavement material is SMA-13 type asphalt mixture; the width of the crack is 2-3.5 cm, and the depth is 2-4 cm; the traffic volume is 1600-1900 vehicles/hour, and heavy-duty vehicles pass through the system; the highest air temperature in summer is 36.8 ℃, and the lowest air temperature in winter is-4.1 ℃. The pavement cracks are distributed within 1 km.
The pavement patching material is as follows: the three major indexes of No. 70 road petroleum asphalt are shown in Table 2. The crack re-cracking length of the road surface repaired one year after the vehicle is started is shown in table 3. (the crack re-cracking length refers to the length of the crack which is re-cracked after the crack pouring material and the crack wall are loaded by vehicles).
Technical indexes of petroleum asphalt for road No. 270 in table
Detecting items Unit of Technical requirements The result of the detection
Penetration (25 ℃, 5s, 100g) 0.1mm 60～80 62
Softening point (TR)&B) ℃ ≥46 47.2
Ductility (15 ℃, 5cm/min) cm ≥100 >100
TABLE 3 cracking after one year of asphalt pavement crack repair
Serial number Crack length (cm) after one year of crack repair general car
Example 1 No cracking phenomenon
Example 2 No cracking phenomenon
Example 3 No cracking phenomenon
Example 4 No cracking phenomenon
Example 5 No cracking phenomenon
Comparative example 1 No cracking phenomenon
Comparative example 2 8.3
Comparative example 3 28.3
Comparative example 4 13.4
Comparative example 5 11.7
Comparative example 6 8.6
Comparative example 7 18.7
Comparative example 8 23.0
Comparative example 9 24.1
As can be seen from tables 1 to 3, examples 1 to 5 all satisfy the requirement that the crack length is less than 3mm in pavement heating type sealant JT/T740-2015, wherein the effect is the best in example 1, and the crack length is less than 1 mm.
The concentration of the coupling agent hydrolysate in the pretreatment solution of the comparative example 1 is higher than that in examples 1 to 5, but the binding power is reduced to a certain extent. The comparative example 2 does not meet the specification requirements, and the reason is that the concentration of the coupling agent hydrolysate is low, so that the number of direct bonds between the crack pouring material and the original interface is small, the adhesive force is reduced, and the crack length is large when an adhesive force test is carried out. The reason why the comparative example 3 does not meet the requirements is that as the concentration of the coupling agent hydrolysate increases, a multi-molecular layer is formed on the crack pouring material and the original crack interface by the hydrolysate of the silane coupling agent KH550, so that the crack pouring material is bonded with a physical adsorption layer formed by the crack pouring material, the number of direct chemical bonds between the pouring material and the interface is reduced, and the bonding force is reduced.
The reason that the crack length in the comparative example 4 does not meet the standard requirements may be that the concentration of the furfural extract oil is high, and the silane coupling agent cannot be completely and uniformly distributed after stirring, so that the bonding force is reduced due to too low or too high local concentration; in addition, the organic solvent only uses furfural extract oil, and the solution has high viscosity, is not easy to spray and is not beneficial to construction. Comparative example 5 the specification was not satisfied because the silane coupling agent KH550 was not sufficiently hydrolyzed to result in a small number of bonds at the interface due to direct mixing of the raw materials. The comparative example 6 has a large crack length because the adhesive force is decreased due to a small amount of scattering.
Comparative example 7 and comparative example 8 respectively adopt coupling agent hydrolysate and organic solvent containing furfural extract oil as pretreating agents, firstly pretreat cracks, and then perform crack pouring treatment by using No. 70 road petroleum asphalt; comparative example 9 No. 70 road petroleum asphalt was used directly for crack sealing treatment without any pretreatment with a treating agent. The result shows that the pretreatment liquid of the invention adopts the joint action of the coupling agent hydrolysate and the organic solvent containing the furfural extract oil with a certain proportion, and has remarkable effect on improving the adhesive force between the crack pouring material and the original asphalt by pretreating the crack.

Claims (8)

1. A pre-treatment liquid for repairing asphalt pavement cracks is characterized in that,
the furfural extract oil-containing organic solvent-based coupling agent comprises a coupling agent hydrolysate and an organic solvent containing furfural extract oil, wherein the mass ratio of the coupling agent hydrolysate to the organic solvent is 1.5-4: 98.5-96;
the mass percentage of the coupling agent in the coupling agent hydrolysate is 10-25%; the mass percentage of the furfural extract oil in the organic solvent is 60-75%;
the preparation method of the pretreatment solution comprises the following steps:
(1) preparation of coupling agent hydrolysate: mixing a silane coupling agent KH550, deionized water and ethanol according to a formula ratio, stirring and hydrolyzing;
(2) preparation of organic solvent: adding ethanol into the furfural extract oil according to the formula ratio, stirring to uniformly mix the ethanol and the furfural extract oil, adding a defoaming agent, and continuously stirring to eliminate bubbles generated in the stirring process;
(3) adding the coupling agent hydrolysate into the organic solvent according to the formula proportion, and stirring and mixing to obtain a pretreatment solution;
the spraying amount of the pretreatment liquid is 0.5-0.7 kg/m2。
2. The pretreatment liquid according to claim 1, wherein the mass ratio of the coupling agent hydrolysate to the organic solvent is 2: 98.
3. The pretreatment solution of claim 2, wherein the coupling agent hydrolysate comprises the following components in parts by mass: 15-30 parts of a silane coupling agent KH550, 15-30 parts of deionized water and 85-75 parts of ethanol; the organic solvent comprises the following components in parts by mass: 75-60 parts of furfural extract oil and 25-40 parts of ethanol.
4. The pretreatment liquid according to claim 3, wherein the organic solvent further comprises 0.1 to 1 part of an antifoaming agent.
5. The pretreatment solution according to claim 1, wherein magnetic stirring is adopted in the step (1), and the stirring time is 30-40 min; stirring by using a stirrer in the step (2), wherein the stirring time is 120-180 s, and the continuous stirring time is 60-120 s; and (4) stirring by adopting a stirrer in the step (3), wherein the stirring time is 60-120 s.
6. A method for repairing cracks of an asphalt pavement by using the pretreatment liquid as claimed in any one of claims 1 to 5, characterized in that before crack pouring, cracks are sprayed by using the pretreatment liquid capable of promoting the adhesion between an asphalt crack interface and a crack pouring material.
7. The method of claim 6, comprising the steps of:
(1) performing joint cutting treatment and cleaning on the crack;
(2) spraying the cracks cleaned in the step (1) with a pretreatment solution, and performing crack pouring construction by using an asphalt crack pouring material; and (5) carrying out molding maintenance after the crack pouring is finished.
8. The method according to claim 7, wherein the spraying amount of the pretreatment liquid to spray the cracks in the step (2) is 0.5 to 0.76kg/m2。
CN202010321871.9A 2020-04-22 2020-04-22 Asphalt pavement crack repairing pretreatment liquid and preparation method and application thereof Active CN111334248B (en)

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