CN112375327A - Cementing material modifier for ultrathin overlay asphalt mixture - Google Patents
Cementing material modifier for ultrathin overlay asphalt mixture Download PDFInfo
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- CN112375327A CN112375327A CN202011120878.0A CN202011120878A CN112375327A CN 112375327 A CN112375327 A CN 112375327A CN 202011120878 A CN202011120878 A CN 202011120878A CN 112375327 A CN112375327 A CN 112375327A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 128
- 239000000203 mixture Substances 0.000 title claims abstract description 115
- 239000000463 material Substances 0.000 title claims abstract description 60
- 239000003607 modifier Substances 0.000 title claims abstract description 58
- 229920001971 elastomer Polymers 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 18
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 claims abstract description 16
- 235000010489 acacia gum Nutrition 0.000 claims abstract description 15
- 239000011159 matrix material Substances 0.000 claims abstract description 15
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 14
- 229920006122 polyamide resin Polymers 0.000 claims abstract description 13
- 239000003381 stabilizer Substances 0.000 claims abstract description 13
- ZCBIFHNDZBSCEP-UHFFFAOYSA-N 1H-indol-5-amine Chemical compound NC1=CC=C2NC=CC2=C1 ZCBIFHNDZBSCEP-UHFFFAOYSA-N 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229920000084 Gum arabic Polymers 0.000 claims abstract description 5
- 241000978776 Senegalia senegal Species 0.000 claims abstract description 5
- 239000000205 acacia gum Substances 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 31
- 239000002245 particle Substances 0.000 claims description 17
- 239000004568 cement Substances 0.000 claims description 13
- 239000006229 carbon black Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 239000005995 Aluminium silicate Substances 0.000 claims description 9
- 235000012211 aluminium silicate Nutrition 0.000 claims description 9
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 4
- 229920002292 Nylon 6 Polymers 0.000 claims description 3
- 229920002302 Nylon 6,6 Polymers 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- 229920000305 Nylon 6,10 Polymers 0.000 claims description 2
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 2
- 229920001519 homopolymer Polymers 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- 150000002430 hydrocarbons Chemical class 0.000 claims description 2
- 229920001195 polyisoprene Polymers 0.000 claims description 2
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 15
- 238000010008 shearing Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 239000001785 acacia senegal l. willd gum Substances 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 4
- 230000001804 emulsifying effect Effects 0.000 description 4
- 238000010561 standard procedure Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 238000010364 biochemical engineering Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- YWJUZWOHLHBWQY-UHFFFAOYSA-N decanedioic acid;hexane-1,6-diamine Chemical compound NCCCCCCN.OC(=O)CCCCCCCCC(O)=O YWJUZWOHLHBWQY-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- QDBQXOAICGSACD-UHFFFAOYSA-N n'-hexylhexanediamide Chemical compound CCCCCCNC(=O)CCCCC(N)=O QDBQXOAICGSACD-UHFFFAOYSA-N 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 108090000765 processed proteins & peptides Proteins 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
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- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a cementing material modifier of an ultrathin overlay asphalt mixture; the cementing material modifier is prepared from the following raw materials in parts by weight: matrix asphalt: 11-22 parts of a styrene-butadiene-styrene block copolymer: 39-47 parts of polyamide resin: 12-17 parts of rubber powder: 10-15 parts of gum arabic: 6-9 parts of 5-aminoindole: 2 parts, stabilizer: 2 parts, a crosslinking agent: and 2 parts. The cementing material modifier is used for producing asphalt mixture, and the obtained asphalt mixture for the ultrathin overlay has excellent adhesion performance, high-temperature performance, water damage resistance and fatigue resistance, can obviously improve the comprehensive pavement performance of the asphalt mixture for the ultrathin overlay, and enhances the durability of roads.
Description
Technical Field
The invention belongs to the technical field of asphalt mixtures for pavements, and particularly relates to a cementing material modifier for an ultrathin overlay asphalt mixture.
Background
Asphalt pavement is an important pavement form in the construction of highways and urban roads. The ultrathin overlay asphalt mixture is mainly used for preventive maintenance of roads and urban asphalt pavements and corrective maintenance of slight diseases, can also be used as a surface wearing layer of a newly-built road, has the characteristics of skid resistance, noise reduction, wear resistance, environmental protection and the like, and can effectively improve the pavement evenness and improve the road running conditions. The ultra-thin overlay asphalt mixture appears in France in the eighties of the 20 th century at the earliest, and the technology is gradually applied in the countries of England, Poland, Switzerland, America and the like, so that good effects are achieved. The ultra-thin cover technology is introduced in 2002 in China, but cannot be well popularized and used until now. There are two main difficulties: firstly, because the thickness of the ultrathin cover surface is thin and is only 1-2 cm generally, the development of reflection cracks is fast; secondly, the adhesion between the ultrathin overlay and the original pavement layer and the adhesion of the ultrathin overlay per se are both insufficient, so that interlayer slippage and massive surface layer stripping are easy to occur.
In order to improve the fatigue resistance, self-adhesive force and interlayer adhesive effect of the ultrathin overlay, some researchers propose to adopt high-performance polymer modified asphalt (high-viscosity modified asphalt) and chemically treated polymer modified emulsified asphalt as a hot-mix asphalt mixture and an adhesive layer respectively, but the actual effect is still more difficult to satisfy. The main body is as follows: 1. after the construction of the ultrathin overlay, reflection cracks of the ultrathin overlay basically penetrate through the original pavement where cracks exist within 2 years; 2. once a vehicle load is generated, most of the existing ultrathin cover surface technologies are difficult to resist wheel rolling and kneading of heavy-duty vehicles, and the interlayer adhesion is weak, so that peeling, loosening and pushing occur; 3. the existing ultrathin cover surface technology cannot resist scouring when meeting water, and the damage forms such as peeling, loosening and the like can be accelerated under the action of hydrodynamic pressure.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a cementing material modifier of an ultrathin overlay asphalt mixture and a preparation method thereof, so as to overcome the defects of insufficient fatigue resistance and easy generation of emission cracks in the prior art; the self-adhesive force is insufficient, the falling is easy, the loosening is easy when meeting water, and the like.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the cementing material modifier for the ultrathin overlay asphalt mixture is characterized by being prepared from the following raw materials in parts by weight: matrix asphalt: 11-22 parts of polyamide resin: 12-17 parts of a styrene-butadiene-styrene block copolymer: 39-47 parts of rubber powder: 10-15 parts of gum arabic: 6-9 parts of 5-aminoindole: 2 parts, stabilizer: 2 parts, a crosslinking agent: 2 parts of (1);
the base asphalt is one or two mixtures of ESSO70# base asphalt or Zhehai 70# base asphalt, and the solubility of the base asphalt in trichloroethylene is not less than 99.9%;
the polyamide resin is white or light yellow solid particles of one or more than two of polyamide-6, polyamide-66 and polyamide-610 which are homopolymers, and the molecular weight of the solid particles is 300-900, such as a Nylon6 product produced by Shanghai Dingfen chemical technology company or Shanghai future industry GmbH, or a NYLON-66 product produced by Beijing Huameili biochemical engineering, or a NYLON6/10 product produced by Jinjinle chemical company;
the styrene-butadiene-styrene block copolymer is in a solid star shape and has a molecular formula of (C)8H8)x(C4H6)yWherein x ranges from 530 to 800, y ranges from 27530 to 35000, for example: SBS products produced by Hubei giant peptide science and technology limited company or Hangzhou Yuhao chemical science and technology limited company;
the rubber powder is polyisoprene rubber, the rubber hydrocarbon content is more than or equal to 50%, and the powder granularity is 30-80 meshes, for example: isoprene rubber products produced by Mingri chemical technology, Inc. in Wuxi city;
the Arabic gum is granular or powdery Arabic gum, white to light yellow granules or powder, the solubility of the Arabic gum in water is 40% -60%, and the Arabic gum can be gradually dissolved into acidic viscous liquid;
the CAS number of the 5-aminoindole is 5192-03-0; the stabilizer is kaolin, and loose powder with the particle size of 1000-3000 meshes is used; the crosslinking agent is carbon black.
The cementing material modifier is used for preparing ultrathin overlay asphalt mixture: adding the cementing material modifier into the asphalt mixed aggregate in a dry method, and prolonging the stirring time for 15-30 s when the asphalt mixed aggregate is stirred originally, so as to obtain an ultrathin overlay asphalt mixture which can be used for asphalt pavement pre-curing, corrective curing or paving an ultrathin wearing layer of a newly-built asphalt pavement; the dosage of the cementing material modifier is 8 to 15 percent of the dosage of the asphalt in the asphalt mixed aggregate, and the optimal dosage is 10 percent of the dosage of the asphalt in the asphalt mixed aggregate;
the aggregate gradation of the ultrathin overlay asphalt mixture is as follows: the aggregate percentage passing through a 9.5mm mesh is 100%, the percentage passing through a 4.75mm mesh is 42-60%, the percentage passing through a 2.36mm mesh is 21-32%, the percentage passing through a 1.18mm mesh is 10-17%, and the percentage passing through a 0.075mm mesh is 0-7%.
The preparation method of the cementing material modifier of the ultrathin overlay asphalt mixture is characterized by comprising the following steps of:
(1) heating the matrix asphalt to 155-165 ℃, adding the polyamide resin, and reacting for 20-60 min under stirring at the rotating speed of 200-400 r/min to obtain a mixture A;
(2) adding the styrene-butadiene-styrene block copolymer, rubber powder and Arabic gum into the mixture A, raising the temperature of the mixture A to 175-185 ℃, and shearing at a shearing rate of 3000-6000 rpm for 30-60 min to obtain a mixture B;
(3) and adding the 5-aminoindole, the stabilizer and the cross-linking agent into the mixture B at 175-185 ℃, and stirring and reacting for 150-360 min at a rotating speed of 100-250 r/min until the material is uniform and has no particles, thus obtaining the cementing material modifier.
Preferably, in the step (1), the mixture A is obtained by reacting for 25-45 min under the stirring of 250-300 r/min
Preferably, in the step (3), the stirring reaction is carried out for 200-300 min at a rotating speed of 140-180 r/min.
At present, no application report of Arabic gum and 5-aminoindole in road asphalt exists. The applicant found that: the proper amount of Arabic gum is introduced to improve the adhesiveness and the flexibility of the asphalt, and also improve the self adhesive property, the high-temperature property and the fatigue resistance of the ultrathin overlay asphalt mixture; the 5-amino indole can enhance the dispersibility of the asphaltene in the light component, and a stable space network structure is formed among the dispersed asphaltene elements, so that the internal modifier component of the cementing material is more uniform, and the performance of the cementing material is more stable. Meanwhile, the amino group in the polyamide resin can improve the surface tension of the cementing material, and an amido bond (-NHCO-) forms a linear macromolecule in the curing process, wherein-CO-, -NH-groups can form hydrogen bond bonding between molecules or between molecules, and the macroscopic flexibility and the fluidity of the linear macromolecule and the hydrogen bond bonded molecules are good, so that the polyamide has the performance of an anti-stripping agent in asphalt, and the adhesion performance of the cementing material can be improved; the addition of the kaolin as the stabilizer is beneficial to improving the dynamic rheological property of the SBS and rubber powder composite modified asphalt, reducing the density difference of the SBS, the rubber powder and the asphalt and further improving the high-temperature storage stability of the cementing material; the addition of the crosslinking agent carbon black has better modification effect on the rheological property and the aging property of the asphalt, and the crosslinking agent carbon black is a cementing material which forms a space network structure and increases the wear resistance and the fatigue resistance of the mixture.
The invention has the beneficial effects that:
the modifier for the ultra-thin overlay asphalt mixture cementing material can greatly improve the self-bonding capability of the mixture and is not easy to scatter and peel off after being used for producing the ultra-thin asphalt mixture; meanwhile, the high-temperature performance, the adhesion performance and the water damage resistance performance, especially the fatigue resistance performance, of the asphalt mixture are obviously improved, so that the pavement performance and the durability of the ultrathin overlay asphalt mixture are obviously improved.
Detailed Description
It should be understood by those skilled in the art that the present embodiment is only for illustrating the present invention and is not to be used as a limitation of the present invention, and changes and modifications of the embodiment can be made within the scope of the claims of the present invention.
Example 1
The cement modifier of the invention was prepared as follows:
(1) heating 22 parts by weight of ESSO70# matrix asphalt to 165 ℃, adding 15 parts of polyamide resin, and reacting for 30min under the stirring at the rotating speed of 250 revolutions per minute to obtain a mixture A;
(2) adding 45 parts of styrene-butadiene-styrene block copolymer (Hubei Jusheng), 12 parts of rubber powder and 6 parts of Arabic gum into the mixture A, simultaneously raising the temperature of the mixture A to 180 ℃, and shearing for 50min at 4000 revolutions per minute by adopting a high-speed shearing emulsifying machine to obtain a mixture B;
(3) and (2) adding 2 parts of 5-aminoindole, 2 parts of kaolin (with the particle size of 1000 meshes) serving as a stabilizer and 2 parts of carbon black serving as a crosslinking agent into the mixture B at 180 ℃, and stirring and reacting for 200min at the rotating speed of 180 revolutions per minute until the materials are uniform and have no particles, so that the cementing material modifier G1 is obtained.
The cementing material modifier is used for preparing ultrathin overlay asphalt mixture: adding the obtained cementing material modifier G1 into the well-mixed asphalt mixed aggregate in a dry method manner, and prolonging the stirring time for 15s on the basis of the original stirring time of the asphalt mixed aggregate to obtain an ultrathin overlay asphalt mixture, wherein the dosage of the cementing material modifier is 10% of the asphalt dosage in the asphalt mixture; the aggregate grade of the ultrathin overlay asphalt mixture is shown in table 1.
Table 1 aggregate grading used in example 1
| Mesh size/mm | 9.5 | 4.75 | 2.36 | 1.18 | 0.075 |
| Through rate/%) | 100 | 45 | 22 | 12 | 3 |
Example 2
The cement modifier of the invention was prepared as follows:
(1) heating 11 parts by weight (the same below) of Zhehai No. 70 matrix asphalt to 160 ℃, adding 17 parts of polyamide resin, and reacting for 30min under stirring at the rotating speed of 300 revolutions per minute to obtain a mixture A;
(2) adding 42 parts of styrene-butadiene-styrene block copolymer (Hubei Jusheng), 15 parts of rubber powder and 9 parts of Arabic gum into the mixture A, simultaneously raising the temperature of the mixture A to 185 ℃, and shearing for 40min at 5500 revolutions/min by adopting a high-speed shearing emulsifying machine to obtain a mixture B;
(3) and (2) adding 2 parts of 5-aminoindole, 2 parts of kaolin (with the particle size of 1800 meshes) serving as a stabilizer and 2 parts of carbon black serving as a crosslinking agent into the mixture B at 185 ℃, and stirring and reacting for 250min at the rotating speed of 170 revolutions per minute until the materials are uniform and have no particles, so that the cementing material modifier G2 is obtained.
The cementing material modifier is used for preparing ultrathin overlay asphalt mixture: putting the obtained cementing material modifier G2 into the well-mixed asphalt mixed aggregate in a dry method mode, and prolonging the stirring time for 20s on the basis of the original stirring time of the asphalt mixed aggregate to obtain the ultrathin overlay asphalt mixture, wherein the feeding amount of the cementing material modifier is 13 percent of the asphalt using amount in the asphalt mixture; the aggregate grade of the ultra-thin overlay asphalt mixture is shown in table 2.
Table 2 grading used in example 2
| Mesh size/mm | 9.5 | 4.75 | 2.36 | 1.18 | 0.075 |
| Through rate/%) | 100 | 50 | 21 | 11 | 0 |
Example 3
The cement modifier of the invention was prepared as follows:
(1) heating 15 parts by weight of ESSO70# matrix asphalt to 155 ℃, adding 14 parts of polyamide resin, and reacting for 40min under stirring at the rotating speed of 280 revolutions per minute to obtain a mixture A;
(2) adding 44 parts of styrene-butadiene-styrene block copolymer (Hubei Jusheng), 14 parts of rubber powder and 7 parts of Arabic gum into the mixture A, simultaneously raising the temperature of the mixture A to 175 ℃, and shearing for 60min at 3000 revolutions per minute by using a colloid mill to obtain a mixture B;
(3) and (2) adding 2 parts of 5-aminoindole, 2 parts of kaolin (with the particle size of 2200 meshes) serving as a stabilizer and 2 parts of carbon black serving as a crosslinking agent into the mixture B at 175 ℃, and stirring and reacting for 300min at the rotating speed of 150 revolutions per minute until the materials are uniform and have no particles, so that the cementing material modifier G3 is obtained.
The cementing material modifier is used for preparing ultrathin overlay asphalt mixture: adding the obtained cementing material modifier G3 into the well-mixed asphalt mixed aggregate in a dry method manner, and prolonging the stirring time for 18s on the basis of the original stirring time of the asphalt mixed aggregate to obtain an ultrathin overlay asphalt mixture, wherein the dosage of the cementing material modifier is 10% of the asphalt dosage in the asphalt mixture; the aggregate grade of the ultra-thin overlay asphalt mixture is shown in table 3.
Table 3 grading used in example 3
| Mesh size/mm | 9.5 | 4.75 | 2.36 | 1.18 | 0.075 |
| Through rate/%) | 100 | 60 | 21 | 10 | 0 |
Comparative example 1
The cement modifier was prepared as follows:
(1) heating 22 parts by weight of ESSO70# matrix asphalt to 165 ℃, adding 14 parts of polyamide resin, and reacting for 30min under the stirring at the rotating speed of 250 revolutions per minute to obtain a mixture A;
(2) adding 46 parts of styrene-butadiene-styrene block copolymer (Hubei Jusheng) and 14 parts of rubber powder into the mixture A, simultaneously raising the temperature of the mixture A to 180 ℃, and shearing for 50min at 4000 revolutions per min by using a high-speed shearing emulsifying machine to obtain a mixture B;
(3) and (3) adding 2 parts of stabilizing agent kaolin (with the particle size of 1000 meshes) and 2 parts of crosslinking agent carbon black into the mixture B at 180 ℃, and stirring and reacting for 250min at the rotating speed of 180 revolutions per minute until the material is uniform and has no particles to obtain the cementing material modifier D1.
Preparing an ultrathin overlay asphalt mixture: putting the obtained cementing material modifier D1 into the well-mixed asphalt mixed aggregate in a dry method mode, and prolonging the stirring time for 15s on the basis of the original stirring time of the asphalt mixed aggregate to obtain the ultrathin overlay asphalt mixture, wherein the feeding amount of the cementing material modifier is 10% of the asphalt using amount in the asphalt mixture; the aggregate grade of the ultrathin overlay asphalt mixture is shown in table 1.
Comparative example 2
The cement modifier was prepared as follows:
(1) heating 20 parts by weight of Zhehai No. 70 matrix asphalt (the same below) to 165 ℃, adding 17 parts of polyamide resin, and reacting for 30min under stirring at the rotating speed of 300 revolutions per minute to obtain a mixture A;
(2) adding 42 parts of styrene-butadiene-styrene block copolymer (Hubei Jusheng) and 15 parts of rubber powder into the mixture A, simultaneously raising the temperature of the mixture A to 185 ℃, and shearing for 40min at 5500 revolutions per min by using a high-speed shearing emulsifying machine to obtain a mixture B;
(3) adding 3 parts of stabilizing agent kaolin (with the particle size of 1800 meshes) and 3 parts of crosslinking agent carbon black into the mixture B at 185 ℃, stirring and reacting for 300min at the rotating speed of 180 r/min until the materials are uniform and have no particles, and obtaining the cementing material modifier D2.
Preparing an ultrathin overlay asphalt mixture: putting the obtained cementing material modifier D2 into the well-mixed asphalt mixed aggregate in a dry method mode, and prolonging the stirring time for 20s on the basis of the original stirring time of the asphalt mixed aggregate to obtain the ultrathin overlay asphalt mixture, wherein the feeding amount of the cementing material modifier is 13% of the asphalt using amount in the asphalt mixture; the aggregate grade of the ultra-thin overlay asphalt mixture is shown in table 2.
Comparative example 3
The cement modifier of the invention was prepared as follows:
(1) heating 22 parts by weight of ESSO70# matrix asphalt to 155 ℃, adding 14 parts of polyamide resin, and reacting for 40min under stirring at the rotating speed of 280 revolutions per minute to obtain a mixture A;
(2) adding 46 parts of styrene-butadiene-styrene block copolymer (Hubei Jusheng) and 14 parts of rubber powder into the mixture A, simultaneously raising the temperature of the mixture A to 175 ℃, and shearing by using a colloid mill at 3000 revolutions per minute for 60min to obtain a mixture B;
(3) and (2) adding 2 parts of stabilizing agent kaolin (with the particle size of 2200 meshes) and 2 parts of crosslinking agent carbon black into the mixture B at 175 ℃, and stirring and reacting for 350min at the rotating speed of 150 r/min until the materials are uniform and have no particles, thus obtaining the cementing material modifier D3.
Preparing an ultrathin overlay asphalt mixture: putting the obtained cementing material modifier D3 into the well-mixed asphalt mixed aggregate in a dry method mode, and prolonging the stirring time for 18s on the basis of the original stirring time of the asphalt mixed aggregate to obtain the ultrathin overlay asphalt mixture, wherein the dosage of the cementing material modifier is 10% of the asphalt dosage in the asphalt mixture; the aggregate grade of the ultra-thin overlay asphalt mixture is shown in table 3.
Comparative example 4
Preparing a common AC-13 asphalt mixture: the cementing material adopts ESSO70# matrix asphalt, the aggregate adopts basalt and limestone, and partial mixture tests are completed according to the standard method specified in road engineering asphalt and asphalt mixture test regulation JTG E20-2011 and the requirements of road asphalt pavement construction technical Specification JTG F40-2004 of China department of transportation.
Comparative example 5
Preparing a common SBS modified asphalt SMA-13 asphalt mixture: according to the standard method specified in the test regulation of road engineering asphalt and asphalt mixture of the China department of transportation Standard JTG E20-2011 and the requirements of the technical Specification of road asphalt pavement construction JTG F40-2004, partial mixture tests are completed.
The ultra-thin overlay asphalt mixture obtained in the examples 1 to 3 and the comparative examples 1 to 5 is used for manufacturing a formed mixture rut test piece and a marshall test piece, and the forming method of the mixture is carried out according to a standard method specified in the test procedure of road engineering asphalt and asphalt mixture of China Ministry of transportation (JTG E20-2011), wherein the mixing temperature of the mixture is 160 ℃ except AC-13, the forming temperature is 145 ℃, the mixing temperature of the rest is 180 ℃, and the forming temperature is 160 ℃; the rolling forming times of the rutting test piece are 12 times (24 times), the dynamic stability of the asphalt mixture rutting test, the residual strength ratio of the asphalt mixture freeze-thaw splitting test and the four-point bending fatigue life test of the asphalt mixture are tested according to the standard method specified in the test regulation JTG E20-2011 of road engineering asphalt and asphalt mixture of China department of transportation, and the test results are shown in Table 4.
TABLE 4 comparison of test results of examples 1 to 3 and comparative examples 1 to 5
As can be seen from table 4: the scattering values of Kentunberg in the examples 1-3 are all smaller than those of the corresponding comparative examples 1-5, which shows that the caking property of the binding material is improved by adopting the cementing material modifier disclosed by the invention, and the produced mixture has strong self-bonding property; similarly, the dynamic stability of the mixture in the examples 1 to 3 is higher than that in the comparative examples 1 to 5, which shows that the mixture produced by using the cementing material modifier of the invention has better high-temperature performance; the residual strength ratios of the mixtures in the freeze-thaw splitting tests in the embodiments 1 to 3 are higher than those in the comparative examples 1 to 5, which shows that the mixtures produced by using the cementing material modifier of the invention have better adhesion performance and water damage resistance; when the strain of 1000 epsilon mu is reached in a fatigue trabecula test of NF50, the fatigue times of examples 1-3 are larger than those of comparative examples 1-5, which shows that the mixture after the cementing material modifier is used for producing the mixture has better fatigue resistance. In conclusion, the cementing material modifier adopting the technology of the invention can improve the self-adhesive property, the high-temperature property, the water damage resistance and the fatigue resistance of the ultrathin overlay asphalt mixture after being used for the mixture production.
Claims (9)
1. The cementing material modifier for the ultrathin overlay asphalt mixture is characterized by being prepared from the following raw materials in parts by weight: matrix asphalt: 11-22 parts of polyamide resin: 12-17 parts of a styrene-butadiene-styrene block copolymer: 39-47 parts of rubber powder: 10-15 parts of gum arabic: 6-9 parts of 5-aminoindole: 2 parts, stabilizer: 2 parts, a crosslinking agent: and 2 parts.
2. The cement modifier of claim 1, wherein the matrix asphalt is one or a mixture of ESSO70# matrix asphalt and Zhenhai 70# matrix asphalt, and the solubility of the matrix asphalt in trichloroethylene is not less than 99.9%.
3. The cement modifier of claim 1, wherein the polyamide resin is one or more of polyamide-6, polyamide-66, and polyamide-610, which are homopolymers.
4. The cement modifier of claim 1, wherein the styrene-butadiene-styrene block copolymer is a solid star with the molecular formula (C)8H8)x(C4H6)yWherein x ranges from 530 to 800, and y ranges from 27530 to 35000.
5. The cement modifier of claim 1, wherein the rubber powder is polyisoprene rubber, the rubber hydrocarbon content is not less than 50%, and the powder particle size is 30-80 mesh.
6. The cement modifier according to claim 1, wherein the gum arabic is a granular or powdery gum arabic, and has a solubility in water of 40% to 60%.
7. The cement modifier of claim 1, wherein the stabilizer is powdered kaolin; the crosslinking agent is carbon black.
8. The cementing material modifier according to any one of claims 1 to 7, which is used for preparing an ultrathin overlay asphalt mixture: adding the cementing material modifier into the asphalt mixed aggregate in a dry method, and stirring for 15-30 s in a way that the original time length for stirring the asphalt mixed aggregate is prolonged to obtain an ultrathin overlay asphalt mixture; the material dosage of the cementing material modifier is 8 to 15 percent of the asphalt dosage in the asphalt mixed aggregate.
9. The cement modifier of claim 8, wherein the ultra-thin overlay asphalt mixture has an aggregate grading of: the aggregate percentage passing through a 9.5mm mesh is 100%, the percentage passing through a 4.75mm mesh is 42-60%, the percentage passing through a 2.36mm mesh is 21-32%, the percentage passing through a 1.18mm mesh is 10-17%, and the percentage passing through a 0.075mm mesh is 0-7%.
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| CN115710100A (en) * | 2022-12-10 | 2023-02-24 | 厦门市政沥青工程有限公司 | Micro-overlay asphalt mixture and preparation method thereof |
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