CN109265075A - A kind of water resistant damage composite modified asphalt mixture and preparation method thereof - Google Patents
A kind of water resistant damage composite modified asphalt mixture and preparation method thereof Download PDFInfo
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- CN109265075A CN109265075A CN201810842112.XA CN201810842112A CN109265075A CN 109265075 A CN109265075 A CN 109265075A CN 201810842112 A CN201810842112 A CN 201810842112A CN 109265075 A CN109265075 A CN 109265075A
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- silane
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- asphalt mixture
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Classifications
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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
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
Abstract
The invention discloses a kind of water resistant damage composite modified asphalt mixtures and preparation method thereof, and the composite modified asphalt mixture, its composition includes: 4-7 parts of modified pitch, 1-2 parts of silane coupling agent hydrating solution, 93-96 parts of building stones in parts by weight.The modified pitch is in parts by weight consisting of: 94-97 parts of matrix pitch, silane surface modified SiO22-4 parts and silane surface modified TiO2It 1-2 parts, is made using high speed shear method.Preparation method is that building stones are carried out surface with silane coupling agent hydrating solution first to be modified, then it is mixed with modified pitch, the modified asphalt mixture of this method preparation its high and low temperature performance, water stabilizing are enhanced in various degree, meanwhile also having the effect of certain degradation vehicle exhaust;And prepared by modifying agent that the present invention selects convenient, and raw material cost is low, obtains that composite modified asphalt mixture per ton cost is only higher than conventional substrate asphalt by about 10%, and great superiority of effectiveness embodies good market popularization value.
Description
Technical field
The present invention relates to asphalt modification technical fields, and in particular to a kind of water resistant damage composite modified asphalt mixture and its system
Preparation Method.
Background technique
While being widely used in high-grade highway along with asphalt pavement structure, the morning of durability and pavement structure
Phase destroys problem and becomes increasingly conspicuous.Though achieving many interim research achievements for the research of Water Damage of Asphalt Pavement phenomenon.But
The factor as involved in Water Damage of Asphalt Pavement is extremely complex, and many problems are not all well solved so far, research
Achievement is not significant, and especially in terms of the application study of prevention and treatment seasonal frost region Water Damage, depth and range all have with actual demand
Sizable distance.
Mainly improve the adhesiveness between pitch and building stones, tradition using antistripping agent in highway construction construction at present
Antistripping agent such as calcium hydroxide, cement, amine antistripping agent etc., the mechanism of action is all to form physical absorption in stone surface, is changed
The electrical property of alexandrite material, to realize the effect to increase adherence, but for acid stone, traditional antistripping agent function and effect have
Limit, and amine antistripping agent is easy thermal decomposition, and the readily volatilized ammonia in storage and application pollutes environment.It is anti-compared to tradition
Exfoliant, silane coupling agent has be more good thermal stability, and can chemically react with stone surface, to building stones
Acid-base property is not also significantly using limitation, while the organo-functional group on coupling agent also has good compatibility with pitch, from
And can more efficiently change the interface improved between pitch and building stones and connect, coupling agent has as a kind of novel antistripping agent
Good application prospect.
But it is often unilateral, antistripping agent that the steady ability of mixture water is only improved in terms of improving oilstone interface consolidation strength
Application may have an adverse effect to other pavement performances, especially cryogenic property.It is necessary to reinforce oilstone from simultaneously as a result,
The angle of interface consolidation strength and mixture overall performance is set out, and is developed water resistant and is damaged modified material.Current most widely used drip
Green modifying agent is SBS, can improve the overall performance of pitch well, but SBS modified pitch is at high price, only in high grade pavement
Middle application.Therefore, it is badly in need of a kind of water resistant damage asphalt for having both price advantage and performance advantage now.
Patent of invention " a kind of asphalt mixed material modifier and its system of high anti-water damage of application number 201210317944.2
For and applied to road surfacing method ", it specifically discloses the modifying agent and comprises the following raw materials by weight percent: polyethylene 60%
~85%, magnesium hydroxide 10%~35%, lubricant 3%~12%, antioxidant 0.1%~0.8%, maleic anhydride grafted polyethylene
0%~10%, carbon black 0.3%~1.5%.But the raw material that the modifying agent is related to is more, at high cost, and complex process, bad control.
Summary of the invention
For status, the purpose of the present invention is to provide a kind of water resistants to damage composite modified asphalt mixture, and the mixture is anti-
Water damage ability it is strong, other aspect pavement performances also improve to a certain extent.
To achieve the above object, the technical solution of the present invention is as follows:
A kind of water resistant damage composite modified asphalt mixture, its composition includes: 4-7 parts of modified pitch, silane in parts by weight
1-2 parts of coupling agent hydrating solution, 93-96 parts of building stones.
In above-mentioned water resistant damage composite modified asphalt mixture, the modified pitch is in parts by weight consisting of: matrix drips
It is 94-97 parts green, silane surface modified SiO22-4 parts and silane surface modified TiO21-2 parts.
Specifically, the silane surface modified SiO2For the hydrophobic nano SiO of the silane modified grafting in surface2Particle, institute
State silane surface modified TiO2For the hydrophobic nano TiO of the silane modified grafting in surface2Particle.
Preferably, in above-mentioned water resistant damage composite modified asphalt mixture, the silane coupling agent hydrating solution is according to silicon
Alkane coupling agent: water: ethyl alcohol=5-8:38-45:50-55 ratio prepares solution, and the solution left standstill of preparation 60 minutes makes it abundant
It hydrolyzes and obtains.
Wherein, the silane coupling agent be KH550, KH560, KH570 any one.
The invention also discloses the preparation methods of above-mentioned water resistant damage composite modified asphalt mixture, specifically comprise the following steps:
(1) stone surface is handled: silane coupling agent hydrating solution is sprayed at stone surface by the ratio uniform first,
Then building stones are placed 4 hours in 160 DEG C of baking ovens, solidifies silane coupling agent sufficiently and obtains silane surface modified building stones;
(2) it prepares modified pitch: matrix pitch being heated to 170 DEG C, proportionally puts into silane surface modified SiO2With
Silane surface modified TiO2, after tentatively mixing and stirring, using high-speed shearing machine with 6000r/min rate high speed shear 1 hour, then exist
1 hour is stood at a temperature of 160 DEG C, infiltrates modified material and pitch sufficiently up to modified pitch;
(3) by dry mixing in the building stones investment blender by step (1) processing, whipping temp is 185 DEG C ± 5 DEG C, dry mixing
Time 10-20s;
(4) finally modified pitch is added through wet-mixing in step (3) treated building stones, the wet-mixing time is 25s ± 5s, is obtained
To composite modified asphalt mixture.
The gradation types for the mixture being prepared can be any types such as AC, SMA, OGFC, with specific reference to engineering reality
Demand is selected, and is not limited by modifying agent and method of modifying.
The present invention has the advantage that
1) present invention passes through while improving the Adhesion property between the adhesive property and pitch and building stones of pitch, can be realized
Greatly improve the water stability of asphalt;
2) high temperature performance of modified asphalt mixture is enhanced in various degree, meanwhile, also there is certain degradation
The effect of vehicle exhaust;
3) modifying agent preparation is convenient, and raw material cost is low, and the composite modified asphalt mixture per ton cost of exploitation is only than normal
Rule matrix pitch compound is high by about 10%, and great superiority of effectiveness embodies good market popularization value.
Detailed description of the invention
Fig. 1 is the comparison of different type mixture residual stability;
Fig. 2 is the comparison of different type mixture dynamic stability;
The comparison of Fig. 3 different type mixture tensile splitting strength;
Fig. 4 is that different type mixture destroys elongation strain comparison.
Specific embodiment
The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention..
Embodiment 1
A kind of modified pitch, in parts by weight consisting of: 96 parts of matrix pitch, silane surface modified SiO22 parts and silicon
Alkane surface is modified TiO22 parts.Wherein, silane surface modified SiO2For the hydrophobic nano SiO of the silane modified grafting in surface2?
Grain, silane surface modified TiO2For the hydrophobic nano TiO of the silane modified grafting in surface2Particle.
Above-mentioned modified pitch the preparation method comprises the following steps: matrix pitch is heated to 170 DEG C, proportionally put into silane surfaces and change
Property SiO2With silane surface modified TiO2, small with 6000r/min rate high speed shear 1 using high-speed shearing machine after tentatively mixing and stirring
When, 1 hour then is stood at a temperature of 160 DEG C, infiltrates modified material and pitch sufficiently up to modified pitch.
Embodiment 2
A kind of modified pitch, in parts by weight consisting of: 95 parts of matrix pitch, silane surface modified SiO24 parts and silicon
Alkane surface is modified TiO21 part.Wherein, silane surface modified SiO2For the hydrophobic nano SiO of the silane modified grafting in surface2?
Grain, silane surface modified TiO2For the hydrophobic nano TiO of the silane modified grafting in surface2Particle.
Above-mentioned modified pitch the preparation method comprises the following steps: matrix pitch is heated to 170 DEG C, proportionally put into silane surfaces and change
Property SiO2With silane surface modified TiO2, small with 6000r/min rate high speed shear 1 using high-speed shearing machine after tentatively mixing and stirring
When, 1 hour then is stood at a temperature of 160 DEG C, infiltrates modified material and pitch sufficiently up to modified pitch.
Embodiment 3
A kind of modified pitch, in parts by weight consisting of: 95.5 parts of matrix pitch, silane surface modified SiO23 parts and
Silane surface modified TiO21.5 part.Wherein, silane surface modified SiO2For the hydrophobic nano of the silane modified grafting in surface
SiO2Particle, silane surface modified TiO2For the hydrophobic nano TiO of the silane modified grafting in surface2Particle.
Above-mentioned modified pitch the preparation method comprises the following steps: matrix pitch is heated to 170 DEG C, proportionally put into silane surfaces and change
Property SiO2With silane surface modified TiO2, small with 6000r/min rate high speed shear 1 using high-speed shearing machine after tentatively mixing and stirring
When, 1 hour then is stood at a temperature of 160 DEG C, infiltrates modified material and pitch sufficiently up to modified pitch.
Embodiment 4
A kind of water resistant damages composite modified asphalt mixture, in parts by weight consisting of: 4 parts of modified pitch, silane coupled
2 parts of agent hydrating solution, 95.9 parts of building stones.
The composition of the modified pitch is the same as embodiment 1.
The silane coupling agent hydrating solution is according to silane coupling agent: water: ethyl alcohol=5:45:50 ratio is prepared molten
Liquid, the solution left standstill of preparation 60 minutes, allows it to be fully hydrolyzed and obtain.The silane coupling agent is KH560.
The preparation method of above-mentioned water resistant damage composite modified asphalt mixture, specifically comprises the following steps:
(1) stone surface is handled: silane coupling agent hydrating solution is sprayed at stone surface by the ratio uniform first,
Then building stones are placed 4 hours in 160 DEG C of baking ovens, solidifies silane coupling agent sufficiently and obtains silane surface modified building stones;
(2) it prepares modified pitch: matrix pitch being heated to 170 DEG C, proportionally puts into silane surface modified SiO2With
Silane surface modified TiO2, after tentatively mixing and stirring, using high-speed shearing machine with 6000r/min rate high speed shear 1 hour, then exist
1 hour is stood at a temperature of 160 DEG C, infiltrates modified material and pitch sufficiently up to modified pitch;
(3) by dry mixing in the building stones investment blender by step (1) processing, whipping temp is 185 DEG C ± 5 DEG C, dry mixing
Time 10s;
(4) finally modified pitch is added through wet-mixing in step (3) treated building stones, the wet-mixing time is 25s, is answered
Close modified asphalt mixture.
Embodiment 5
A kind of water resistant damages composite modified asphalt mixture, in parts by weight consisting of: 5 parts of modified pitch, silane coupled
1.5 parts of agent hydrating solution, 94.9 parts of building stones.
The composition of the modified pitch is the same as embodiment 2.
The silane coupling agent hydrating solution is according to silane coupling agent: water: ethyl alcohol=6:46:48 ratio is prepared molten
Liquid, the solution left standstill of preparation 60 minutes, allows it to be fully hydrolyzed and obtain.The silane coupling agent is KH550.
The preparation method of above-mentioned water resistant damage composite modified asphalt mixture, specifically comprises the following steps:
(1) stone surface is handled: silane coupling agent hydrating solution is sprayed at stone surface by the ratio uniform first,
Then building stones are placed 4 hours in 160 DEG C of baking ovens, solidifies silane coupling agent sufficiently and obtains silane surface modified building stones;
(2) it prepares modified pitch: matrix pitch being heated to 170 DEG C, proportionally puts into silane surface modified SiO2With
Silane surface modified TiO2, after tentatively mixing and stirring, using high-speed shearing machine with 6000r/min rate high speed shear 1 hour, then exist
1 hour is stood at a temperature of 160 DEG C, infiltrates modified material and pitch sufficiently up to modified pitch;
(3) by dry mixing in the building stones investment blender by step (1) processing, whipping temp is 185 DEG C ± 5 DEG C, dry mixing
Time 15s;
(4) finally modified pitch is added through wet-mixing in step (3) treated building stones, the wet-mixing time is 20s, is answered
Close modified asphalt mixture.
Embodiment 6
A kind of water resistant damages composite modified asphalt mixture, in parts by weight consisting of: 7 parts of modified pitch, silane coupled
1 part of agent hydrating solution, 92.9 parts of building stones.
The composition of the modified pitch is the same as embodiment 3.
The silane coupling agent hydrating solution is according to silane coupling agent: water: ethyl alcohol=8:40:52 ratio is prepared molten
Liquid, the solution left standstill of preparation 60 minutes, allows it to be fully hydrolyzed and obtain.The silane coupling agent is KH570.
The preparation method of above-mentioned water resistant damage composite modified asphalt mixture, specifically comprises the following steps:
(1) stone surface is handled: silane coupling agent hydrating solution is sprayed at stone surface by the ratio uniform first,
Then building stones are placed 4 hours in 160 DEG C of baking ovens, solidifies silane coupling agent sufficiently and obtains silane surface modified building stones;
(2) it prepares modified pitch: matrix pitch being heated to 170 DEG C, proportionally puts into silane surface modified SiO2With
Silane surface modified TiO2, after tentatively mixing and stirring, using high-speed shearing machine with 6000r/min rate high speed shear 1 hour, then exist
1 hour is stood at a temperature of 160 DEG C, infiltrates modified material and pitch sufficiently up to modified pitch;
(3) by dry mixing in the building stones investment blender by step (1) processing, whipping temp is 185 DEG C ± 5 DEG C, dry mixing
Time 20s;
(4) finally modified pitch is added through wet-mixing in step (3) treated building stones, the wet-mixing time is 30s, is answered
Close modified asphalt mixture.
In order to further verify beneficial effects of the present invention, applicant has also carried out following test, specific as follows:
In order to determine the pavement performance of researched and developed modified pitch, six kinds of different mixtures are prepared, design parameter situation is shown in
Table 1, and by multinomial pavement performance test, judge the performance advantage of institute's invention modified asphalt mixture.
1 mixture sample of table prepares situation statistical form
1, water stability testing
According to the regulation of " highway asphalt and Asphalt Mixture Experiment regulation ", using immersion Marshall test and the full water of vacuum
Two methods of Marshall Test evaluate the water stability of asphalt.The test knot obtained after each group sample stability test
Fruit such as Fig. 1.It will be seen from figure 1 that SAM modified asphalt mixture and SSAM modified asphalt mixture water stability are relative to matrix
Asphalt CAM improves a lot, and wherein the immersion residual stability of SSAM modified material is 85.18%, can be effective
Improve the immersion residual stability of mixture, on the whole, SiO2+TiO2With silane SiO2+ silane TiO2Modified pitch is for mentioning
High mixture water stability has certain positive effect.After further mixing silane coupling agent on the basis of three kinds of asphalt materials,
Its water stability integrally has the raising of significantly different degree, the reason is that improving pitch after since silane coupling agent is added
The adhesion property of itself enhances the consolidation strength at oilstone interface, to be integrally improved the water stabilizing of mixture.Especially
It is SSAKM modified material, contrast media asphalt CAM, immersion residual stability improves 19.2%, and vacuum is satisfied water residual
Stabilization improves 18.2%, shows very superior water stabilizing.2, high-temperature rutting test
According to the high temperature rutting resistance of the wheel tracking test method measurement asphalt of specification T0719-2011.Each group examination
The test result that sample wheel tracking test obtains is shown in Fig. 2.It can be seen that SiO2+TiO2With silane SiO2(silane surface modified SiO2)+
Silane TiO2(silane surface modified TiO2) modified material can improve the dynamic stability of matrix pitch compound well, in addition,
Modified asphalt mixture after addition silane coupling agent has more apparent raising relative to the dynamic stability for being not added with group,
The dynamic stability of SSAKM reaches 3087 times/mm, the 1175 times/mm much higher than CAM, shows using silane SiO2, silane TiO2With
Asphalt after silane coupling agent is composite modified can significantly improve high-temperature stability.
3, low temperature cracking test
The cryogenic property of each mixture is evaluated using low temperature cracking test, test result is as shown in Figure 3, Figure 4.
The SiO it can be seen from Fig. 3 and Fig. 42+TiO2With silane SiO2+ silane TiO2With can preferably improve mixture
Tensile splitting strength and destroy elongation strain, modified Nano-meter SiO_22、TiO2Function and effect more preferably, illustrate nanofiller pair
There is good effect in promoting mixture cryogenic property.After silane coupler modified building stones, the low temperature of asphalt is split
Resistance to spalling all improves, but destroys elongation strain and counter productive is then partially presented, it is seen then that silane coupler modified building stones pair
In improving, low temperature performance of asphalt effect is limited, it is also possible to play negative effect, therefore improve mixing in application coupling agent
While expecting water stability, it is necessary to add other modifying agent (if the present invention is using suitable asphalt modifier) to assist improving
Mixture entirety pavement performance is also demonstrated from side and is modified based on interface enhancing simultaneously and overall performance raising exploitation water resistant damage
The correctness of material thinking.In addition, TiO2Use also make the road surface of the mixture making have absorb vehicle exhaust function,
Realize certain environment protecting.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (6)
1. a kind of water resistant damages composite modified asphalt mixture, which is characterized in that the composite modified asphalt mixture is with parts by weight
Counting its composition includes: 4-7 parts of modified pitch, 1-2 parts of silane coupling agent hydrating solution, 93-96 parts of building stones.
2. water resistant according to claim 1 damages composite modified asphalt mixture, which is characterized in that the modified pitch is with weight
Part meter is measured consisting of: 94-97 parts of matrix pitch, silane surface modified SiO22-4 parts and silane surface modified TiO21-2 parts.
3. water resistant according to claim 1 or 2 damages composite modified asphalt mixture, which is characterized in that the silane surfaces
Modified SiO2For the hydrophobic nano SiO of the silane modified grafting in surface2Particle, the silane surface modified TiO2For surface warp
The hydrophobic nano TiO of silane-modified grafting2Particle.
4. water resistant according to claim 1 damages composite modified asphalt mixture, which is characterized in that the silane coupling agent water
Solving solution is according to silane coupling agent: water: ethyl alcohol=5-8:38-45:50-55 ratio prepares solution, the solution left standstill of preparation
60 minutes, it is allowed to be fully hydrolyzed and obtain.
5. water resistant according to claim 4 damages composite modified asphalt mixture, which is characterized in that the silane coupling agent is
KH550, KH560, KH570 any one.
6. the preparation method of any one of the claim 1-5 water resistant damage composite modified asphalt mixture, which is characterized in that described
Preparation method includes the following steps:
(1) stone surface is handled: silane coupling agent hydrating solution being sprayed at stone surface by the ratio uniform first, then
Building stones are placed 4 hours in 160 DEG C of baking ovens, solidifies silane coupling agent sufficiently and obtains silane surface modified building stones;
(2) it prepares modified pitch: matrix pitch being heated to 170 DEG C, proportionally puts into silane surface modified SiO2With silane table
Face is modified TiO2, after tentatively mixing and stirring, using high-speed shearing machine with 6000r/min rate high speed shear 1 hour, then at 160 DEG C
At a temperature of stand 1 hour, make modified material and pitch sufficiently infiltrate obtained modified pitch;
(3) by dry mixing in the building stones investment blender by step (1) processing, whipping temp is 185 DEG C ± 5 DEG C, the dry mixing time
10-20s;
(4) finally modified pitch is added through wet-mixing in step (3) treated building stones, the wet-mixing time is 25s ± 5s, is answered
Close modified asphalt mixture.
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CN111548055A (en) * | 2019-02-11 | 2020-08-18 | 天津恒吉生科技有限公司 | Composite modified asphalt mixture and preparation method thereof |
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CN112321185A (en) * | 2020-11-16 | 2021-02-05 | 武汉理工大学 | Modified aggregate and preparation method and application thereof |
CN113998924A (en) * | 2021-12-13 | 2022-02-01 | 中南大学 | Asphalt mixture resisting water damage and preparation method thereof |
CN114316362A (en) * | 2021-12-28 | 2022-04-12 | 哈尔滨工业大学 | Asphalt mixture adhesion improving method based on silane coupling agent hydrolysis powder |
CN114316362B (en) * | 2021-12-28 | 2023-08-11 | 哈尔滨工业大学 | Asphalt mixture adhesiveness improvement method based on silane coupling agent hydrolysis powder |
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