CN108975760B - Reinforcing agent for modifying acidic aggregate asphalt mixture and application - Google Patents
Reinforcing agent for modifying acidic aggregate asphalt mixture and application Download PDFInfo
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- CN108975760B CN108975760B CN201810975654.4A CN201810975654A CN108975760B CN 108975760 B CN108975760 B CN 108975760B CN 201810975654 A CN201810975654 A CN 201810975654A CN 108975760 B CN108975760 B CN 108975760B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
Abstract
The invention relates to the technical field of road building materials, in particular to a reinforcing agent for modifying an acidic aggregate asphalt mixture and application thereof. The reinforcing agent for modifying the acidic aggregate asphalt mixture comprises a modifier A and a modifier B which are used in a matching way; the mass of the modifier A is 0.2-2% of the mass of the matrix asphalt in the acid aggregate asphalt mixture, and the mass of the modifier B is 0.4-1% of the total mass of the acid aggregate asphalt mixture. When the reinforcing agent for modifying the acidic aggregate asphalt mixture is applied to pavement paving, the mixing temperature and the forming temperature are reduced by dozens of degrees compared with the common hot-mixed asphalt mixture, the energy consumption is saved, the aging degree of asphalt is effectively weakened, meanwhile, the reduction of the mixing temperature can reduce the emission of toxic gases, the harm to people and the environment is reduced to the maximum extent, and the reinforcing agent has ideal social benefit, economic benefit and environmental benefit.
Description
Technical Field
The invention relates to the technical field of road building materials, in particular to a reinforcing agent for modifying an acidic aggregate asphalt mixture and application thereof.
Background
The building stones commonly used for asphalt concrete pavements are alkaline limestone and neutral basalt, which are widely used because of their good adhesion to asphalt. Due to the limitation of natural resources and the rapid development speed of highways, a large amount of used high-quality aggregates reach the situation of short supply and short demand, great pressure is brought to the mining and supply of the aggregates, and basalt and limestone are becoming more and more in shortage as ideal coarse aggregates of asphalt concrete. However, the adhesion between the acidic aggregate and the asphalt is often not satisfactory, and the asphalt and the mineral aggregate are separated from each other by repeated loading under the action of water erosion after the pavement adopting the acidic aggregate is formed until the asphalt is loosened to cause pit grooves, so that the pavement is damaged, and further the transportation is influenced.
Disclosure of Invention
The invention provides a reinforcing agent for modifying an acidic aggregate asphalt mixture and application thereof, and solves the problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a reinforcing agent for modifying an acidic aggregate asphalt mixture comprises a modifier A and a modifier B which are used in a matching way; the mass of the modifier A is 0.2-2% of the mass of the matrix asphalt in the acid aggregate asphalt mixture, and the mass of the modifier B is 0.4-1% of the total mass of the acid aggregate asphalt mixture;
the modifier A is a silane coupling agent; the modifier B is natural asphalt solid powder.
The particle size of the natural asphalt solid powder of the modifier B is 300-600 meshes.
The silane coupling agent is KH550 or KH 570.
The natural asphalt is natural asphalt containing asphaltene and colloid components.
The application of the reinforcing agent for modifying the acid aggregate asphalt mixture in the acid aggregate asphalt mixture comprises the following operation steps:
(1) determining the quality of the modifier A and the modifier B according to the total amount of the acidic aggregate asphalt mixture to be prepared and the quality of the matrix asphalt for preparing the acidic aggregate asphalt mixture; preparing matrix asphalt, acidic aggregate, mineral powder, a modifier A and a modifier B for later use;
(2) heating the matrix asphalt to 140-160 ℃, and then adding the modifier A obtained in the step (1) into the matrix asphalt for mixing for 20-60min to obtain modified asphalt;
(3) heating and controlling the temperature of the acidic aggregate to 160-200 ℃, adding the modified asphalt obtained in the step (2) into the acidic aggregate, and mixing for 90s to obtain a product 1;
(4) and (4) adding the modifier B and the mineral powder into the product 1 obtained in the step (3), and mixing for 90 seconds at the temperature of 150-.
The invention has the beneficial effects that:
compared with other common modifiers, the main component of the reinforcing agent for modifying the acid aggregate asphalt mixture is natural asphalt, so that the cost is more advantageous; the natural asphalt adopts 300-mesh 600-mesh asphalt and colloid components, has good compatibility with the matrix asphalt and low requirement on the quality of the matrix asphalt; the problems of segregation, poor stability and the like commonly existing in the wet modified asphalt can be effectively avoided by adopting dry mixing.
Compared with asphalt mixture modified by rock asphalt, minerals and the like, the invention adopts silane coupling agent to modify the matrix asphalt, then mixes the acidic aggregate and the modified asphalt, and then mixes the natural asphalt and the materials by adopting dry method, thus fully playing respective performance advantages of the natural asphalt and the coupling agent, forming performance complementation and solving the problem that the acidic aggregate can not be used as asphalt mixture aggregate. The silane coupling agent can enable asphalt and acidic aggregates such as granite and the like to be connected by chemical bonds, and particularly, the asphalt component doped with the silane coupling agent contains Si-OH, HO-Si exists on the surface of granite, and the two are combined to form Si-O-Si chemical bonds; the natural asphalt contains a large amount of asphaltene components, and can improve the high-temperature performance of the asphalt.
The mixing temperature of the conventional asphalt mixture reinforcing agent is higher, so that the cost of fuel consumption is increased; in addition, the thermal aging reaction of asphalt, the discharge of toxic gases and exhaust gases cause environmental pollution. When the reinforcing agent for modifying the acidic aggregate asphalt mixture is applied to pavement paving, the mixing temperature and the forming temperature are reduced by dozens of degrees compared with the common hot-mixed asphalt mixture, the energy consumption is saved, the aging degree of asphalt is effectively weakened, meanwhile, the reduction of the mixing temperature can reduce the emission of toxic gases, the harm to people and the environment is reduced to the maximum extent, and the reinforcing agent has ideal social benefit, economic benefit and environmental benefit.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments.
Example 1
The reinforcing agent for modifying the acidic aggregate asphalt mixture comprises a modifier A and a modifier B which are matched; the mass of the modifier A is 0.2 percent of that of the matrix asphalt, and the mass of the modifier B is 1 percent of the total mass of the acid aggregate asphalt mixture;
the modifier A is a silane coupling agent KH550, and the modifier B is natural asphalt solid powder with 300 meshes.
The specific formulation of the acidic aggregate asphalt mixture suitable for the pavement lower layer is as follows 1:
TABLE 1
The amount of the matrix asphalt in table 1 above is by an internal doping method.
The reinforcing agent of the embodiment is added on the basis of the acid aggregate asphalt mixture for the pavement lower surface layer for modification, and the modified asphalt mixture for the acid aggregate is obtained.
The application of the reinforcing agent for modifying the acid aggregate asphalt mixture in the acid aggregate asphalt mixture for the pavement lower surface layer comprises the following operation steps:
(1) firstly, adding a modifier A which accounts for 0.2 percent of the mass of the matrix asphalt in the table 1 into the matrix asphalt, wherein the heating temperature of the matrix asphalt is 160 ℃, and the mixing time is 60min to obtain modified asphalt;
(2) then adding the acid aggregate with the temperature of 180 ℃ and the modified asphalt obtained in the step (1) into a mixing pot, and stirring for 90 seconds, wherein the stirring temperature is 150 ℃;
(3) finally, adding the modifier B accounting for 1% of the total mass of the acidic aggregate asphalt mixture and the mineral powder in the table 1 into a mixing pot, and stirring for 90 seconds to obtain an asphalt mixture; the obtained asphalt mixture can be paved and formed at 130 ℃.
The following table 2 shows the mixing parameters and the rutting dynamic stability test results of the acidic aggregate asphalt mixture modified by adding the reinforcing agent of the embodiment. The blank group is an acidic aggregate asphalt mixture which is not doped with the reinforcing agent and is used for the pavement lower layer, and the SBS modifier group is formed by doping an SBS modifier which accounts for 5 percent of matrix asphalt on the basis of the acidic aggregate asphalt mixture which is suitable for the pavement lower layer in the table 1. The dynamic stability of the asphalt mixture of the test group in the example 1 is far higher than that of the asphalt mixture of the blank group, the heating temperature of the matrix asphalt, the mixing temperature of the mixture and the compaction temperature in the test group in the example 1 are reduced by about 20-40 ℃ compared with those of the SBS modifier group, and the performances of the asphalt mixture are slightly higher than those of the SBS modifier group, and are specifically shown in the following table 2:
TABLE 2 Rut stability test results for acid aggregate bituminous mixture
Example 2
The reinforcing agent for modifying the acidic aggregate asphalt mixture comprises a modifier A and a modifier B which are matched; the mass of the modifier A is 2 percent of that of the matrix asphalt, and the mass of the modifier B is 0.4 percent of the total mass of the acid aggregate asphalt mixture;
the modifier A is a silane coupling agent KH570, and the modifier B is natural asphalt solid powder with 600 meshes.
The acid aggregate asphalt mixture suitable for the road middle surface layer is specifically prepared as the following table 3:
TABLE 3
The amount of the matrix asphalt in table 3 above is by an internal doping method.
The reinforcing agent of the embodiment is added on the basis of the acid aggregate asphalt mixture for the surface layer in the road for modification, so as to obtain the modified asphalt mixture for the acid aggregate.
The application of the reinforcing agent for modifying the acid aggregate asphalt mixture in the acid aggregate asphalt mixture for the surface layer in the road comprises the following operation steps:
(1) firstly, adding a modifier A accounting for 2% of the mass of the matrix asphalt in the table 3 into the matrix asphalt, wherein the heating temperature of the matrix asphalt is 140 ℃, and the mixing time is 20min to obtain modified asphalt;
(2) then adding the acidic aggregate with the temperature of 160 ℃ and the modified asphalt obtained in the step (1) into a mixing pot, and stirring for 90 seconds, wherein the stirring temperature is 170 ℃;
(3) finally, adding the modifier B accounting for 0.4 percent of the total mass of the acidic aggregate asphalt mixture and the mineral powder in the table 3 into a mixing pot and stirring for 90 seconds to obtain an asphalt mixture; the obtained asphalt mixture can be spread and molded at 150 ℃.
Table 4 below shows the blending parameters of the acidic aggregate asphalt mixture and the results of the rutting stability test obtained in example 2 of the present invention, wherein the blank group is the acidic aggregate asphalt mixture suitable for the underlying road layer without the reinforcing agent of the present invention, and the SBS modifier group is the acidic aggregate asphalt mixture suitable for the underlying road layer in table 3 with 4.5% SBS modifiers based on the matrix asphalt; the dynamic stability of the asphalt mixture of the test group in example 2 is much higher than that of the asphalt mixture of the blank group, the heating temperature of the matrix asphalt, the mixing temperature of the mixture and the compacting temperature of the matrix asphalt in the test group in example 2 are reduced by about 20-40 ℃ compared with those of the SBS modifier group, and the performances of the asphalt mixture are slightly higher than those of the SBS modifier group, which is specifically shown in the following table 4.
TABLE 4 Rut stability test results for acidic aggregate bituminous mixture
Example 3
The reinforcing agent for modifying the acidic aggregate asphalt mixture comprises a modifier A and a modifier B which are matched; the mass of the modifier A is 1 percent of that of the matrix asphalt, and the mass of the modifier B is 0.7 percent of the total mass of the acid aggregate asphalt mixture;
the modifier A is a silane coupling agent KH550, and the modifier B is natural asphalt solid powder of 400 meshes.
The acid aggregate asphalt mixture suitable for the pavement upper surface layer comprises the following specific components in percentage by weight:
TABLE 5
The amounts of pitch and fiber in table 5 above were used by the incorporation method.
The reinforcing agent of the embodiment is added on the basis of the acid aggregate asphalt mixture for the pavement upper layer for modification, so as to obtain the modified asphalt mixture for the acid aggregate.
The application of the reinforcing agent for modifying the acid aggregate asphalt mixture in the acid aggregate asphalt mixture suitable for the pavement upper surface comprises the following operation steps:
(1) firstly, adding a modifier A accounting for 1% of the mass of the matrix asphalt in the table 5 into the matrix asphalt, wherein the heating temperature of the matrix asphalt is 150 ℃, and the mixing time is 40min to obtain modified asphalt;
(2) then adding the acidic aggregate with the temperature of 200 ℃ and the modified asphalt obtained in the step (1) into a mixing pot, and stirring for 90 seconds, wherein the stirring temperature is 160 ℃;
(3) finally, adding the modifier B accounting for 0.7 percent of the total mass of the acidic aggregate asphalt mixture and the mineral powder in the table 5 into a mixing pot and stirring for 90 seconds to obtain an asphalt mixture; the obtained asphalt mixture can be paved and molded at 140 ℃.
Table 6 below shows the blending parameters of the acidic aggregate asphalt mixture and the results of the dynamic rutting stability test obtained in example 3 of the present invention, wherein the blank group is the acidic aggregate asphalt mixture suitable for the upper pavement layer without the reinforcing agent of the present invention, and the SBS modifier group is the SBS modifier which is 5.5% of the matrix asphalt added to the acidic aggregate asphalt mixture suitable for the upper pavement layer in table 5; the dynamic stability of the asphalt mixture of the test group in example 3 is much higher than that of the asphalt mixture of the blank group, the heating temperature of the matrix asphalt, the mixing temperature of the mixture and the compacting temperature of the matrix asphalt in the test group in example 3 are reduced by about 20-40 ℃ compared with those of the SBS modifier group, and the performances of the asphalt mixture are slightly higher than those of the SBS modifier group, which is specifically shown in the following table 6.
TABLE 6 rut stability test results for acidic aggregate bituminous mixtures
| Categories | Temperature (. degree.C.) for heating asphalt | Mixing temperature (. degree.C.) | Compacting temperature (. degree. C.) | Dynamic stability DS (sub/mm) |
| Blank group | 160 | 155 | 130 | 6987 |
| Example 3 test group | 160 | 150 | 130 | 11052 |
| SBS modifier group | 180 | 185 | 170 | 10690 |
The acidic aggregate is granite, basalt or other acidic aggregates; the mineral powder is limestone mineral powder; the matrix asphalt is 70# matrix asphalt, and in addition, asphalt such as 70#, 90#, 110# and the like which meet JTG F40-2004 technical requirements for road petroleum asphalt of Ministry of transportation are all suitable for the invention.
Comparative example 1
The same as the acidic aggregate asphalt mixture suitable for the pavement lower surface course in the table 1 in the example 1, the acidic aggregate asphalt mixture is modified by a modifier A accounting for 2.5 percent of the mass of the matrix asphalt and a modifier B accounting for 0.3 percent of the total mass of the asphalt mixture, and the specific steps are as follows:
(1) firstly, adding a modifier A accounting for 2.5 percent of the mass of the matrix asphalt into the matrix asphalt, wherein the heating temperature of the matrix asphalt is 150 ℃, and the mixing time is 40min to obtain modified asphalt;
(2) then adding the acidic aggregate with the temperature of 200 ℃ and the modified asphalt obtained in the step (1) into a mixing pot, and stirring for 90 seconds, wherein the stirring temperature is 160 ℃;
(3) finally, adding the modifier B accounting for 0.3 percent of the total mass of the acidic aggregate asphalt mixture and the mineral powder in the table 1 into a mixing pot, and stirring for 90 seconds to obtain an asphalt mixture; the obtained asphalt mixture can be paved and molded at 140 ℃.
Table 7 below shows the results of the rutting stability test for the asphalt mixture of the acidic aggregate of this comparative example, wherein the blank was the same as that of example 1.
TABLE 7
| Categories | Dynamic stability DS (sub/mm) |
| Blank group | 4630 |
| Comparative example 1 test group | 4238 |
As can be seen from Table 7, when the amounts of modifier A and modifier B are outside the range of the present invention, the resulting modified asphalt mixture has poor dynamic stability.
Comparative example 2
The same as the acidic aggregate asphalt mixture suitable for the pavement lower surface course in the table 1 in the example 1, the acidic aggregate asphalt mixture is modified by a modifier A accounting for 1.2 percent of the mass of the matrix asphalt and a modifier B accounting for 0.5 percent of the total mass of the asphalt mixture, and the specific steps are as follows:
(1) adding the modifier A and the modifier B into matrix asphalt together, wherein the heating temperature of the matrix asphalt is 150 ℃, and the mixing time is 40min to obtain modified asphalt;
(2) adding the acid aggregate with the temperature of 190 ℃ and the modified asphalt in the step (1) into a mixing pot, and stirring for 90 seconds at the stirring temperature of 160 ℃;
(3) and (3) adding the mineral powder into a mixing pot, stirring for 90 seconds to obtain an asphalt mixture of the acidic aggregate, and spreading and molding at 150 ℃.
Table 8 below shows the results of the rutting stability test for the asphalt mixture of the acidic aggregate of this comparative example, wherein the blank was the same as that of example 1.
TABLE 8
As can be seen from Table 8, the rutting dynamic stability results for the asphalt mixture of acidic aggregates obtained after modification procedure changes were poor.
The above-described embodiments should not be construed as limiting the scope of the invention, and any alternative modifications or alterations to the embodiments of the present invention will be apparent to those skilled in the art.
The present invention is not described in detail, but is known to those skilled in the art.
Claims (3)
1. The application of the reinforcing agent for modifying the acid aggregate asphalt mixture is characterized in that: the reinforcing agent is prepared from a modifier A and a modifier B which are used in a matching way; the mass of the modifier A is 0.2-2% of the mass of the matrix asphalt in the acid aggregate asphalt mixture, and the mass of the modifier B is 0.4-1% of the total mass of the acid aggregate asphalt mixture;
the modifier A is a silane coupling agent; the modifier B is natural asphalt solid powder;
the particle size of the natural asphalt solid powder of the modifier B is 400-600 meshes;
the reinforcing agent is used by adopting the following operation steps:
(1) determining the quality of the modifier A and the modifier B according to the total amount of the acidic aggregate asphalt mixture to be prepared and the quality of the matrix asphalt for preparing the acidic aggregate asphalt mixture; preparing matrix asphalt, acidic aggregate, mineral powder, a modifier A and a modifier B for later use;
(2) heating the matrix asphalt to 140-160 ℃, and then adding the modifier A obtained in the step (1) into the matrix asphalt for mixing for 20-60min to obtain modified asphalt;
(3) heating and controlling the temperature of the acidic aggregate to 160-200 ℃, adding the modified asphalt obtained in the step (2) into the acidic aggregate, and mixing for 90s to obtain a product 1;
(4) and (4) adding the modifier B and the mineral powder into the product 1 obtained in the step (3), and mixing for 90 seconds at the temperature of 150-.
2. Use of a reinforcing agent for the modification of an acidic aggregate asphalt mixture according to claim 1, characterized in that: the silane coupling agent is KH550 or KH 570.
3. Use of a reinforcing agent for the modification of an acidic aggregate asphalt mixture according to claim 1, characterized in that: the natural asphalt is natural asphalt containing asphaltene and colloid components.
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| CN110451848A (en) * | 2019-08-29 | 2019-11-15 | 沈阳建筑大学 | The modified pitch and its preparation method that gather materials towards poor quality and application |
| CN112408856A (en) * | 2020-11-12 | 2021-02-26 | 马鞍山十七冶工程科技有限责任公司 | Environment-friendly pavement rapid repairing material and preparation method thereof |
| CN114133154B (en) * | 2021-12-02 | 2023-02-07 | 山东省交通科学研究院 | Micron-sized anti-stripping agent for acidic aggregate asphalt mixture and use method thereof |
| CN114179219B (en) * | 2021-12-02 | 2023-03-21 | 山东省交通科学研究院 | Preparation method of acidic aggregate asphalt concrete in plateau area and asphalt concrete |
| CN114477826A (en) * | 2022-01-17 | 2022-05-13 | 西安理工大学 | Preparation device and preparation method of asphalt concrete containing modified acid aggregate |
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| KR100753854B1 (en) * | 2007-04-30 | 2007-08-30 | (주)일우피피씨 | Powder type asphalt modifier and asphalt concrete usingasphalt pavement and porous pavement |
| CN101941817A (en) * | 2010-11-05 | 2011-01-12 | 吉林大学 | Hydrophobic and lipophilic modified asphalt and production method thereof |
| CN102260412A (en) * | 2011-06-20 | 2011-11-30 | 山东交通学院 | Preparation method of silane coupling agent modified road petroleum asphalt |
| CN103708772A (en) * | 2013-12-10 | 2014-04-09 | 柳州博泽科技有限公司 | Preparation method of mixture of modified asphalt modified by applying petroleum asphalt |
| CN106398243B (en) * | 2016-08-29 | 2019-03-15 | 山东高速路用新材料技术有限公司 | A kind of asphalt reinforcing agent and preparation method thereof |
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