CN111393075B - High-viscosity modified asphalt mixture and application thereof - Google Patents
High-viscosity modified asphalt mixture and application thereof Download PDFInfo
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- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
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- C04B14/04—Silica-rich materials; Silicates
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/14—Minerals of vulcanic origin
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/42—Glass
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- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
- C04B22/064—Oxides, Hydroxides of the alkali or alkaline-earth metals of the alkaline-earth metals
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- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
- C04B24/121—Amines, polyamines
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- C04B24/24—Macromolecular compounds
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- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2688—Copolymers containing at least three different monomers
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
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- 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
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a high-viscosity modified asphalt mixture and application thereof, wherein the high-viscosity modified asphalt mixture comprises the following components in parts by weight: 25-35 parts of first aggregate; 20-30 parts of second aggregate; 35-55 parts of third aggregate; 0-3 parts of a filler; 9-15 parts of high-viscosity high-elasticity modified emulsified asphalt; 0-0.3 part of glass fiber; 0-3 parts of an additive; the application of the high-viscosity modified asphalt mixture is that the high-viscosity modified asphalt mixture automatically flows and is molded into a pavement overlay after being paved; the high-viscosity modified asphalt mixture is a slurry mixture, has good fluidity and can invade into asphalt road surface cracks, so that the asphalt road surface cracks are repaired, and new cracks on an asphalt pavement can be effectively inhibited.
Description
Technical Field
The invention relates to a high-viscosity modified asphalt mixture and application thereof, belonging to the technical field of pavement construction.
Background
The preventive maintenance of the asphalt pavement can improve and restore the surface function of the pavement, reduce the times of major and intermediate repair in the whole life cycle and prolong the service life of the pavement, and is commonly applied in China. The conventional preventive maintenance pavement is thin and is not used as a road structure layer, but the comprehensive load effects of tension, compression, shear, torsion and the like are borne, so that the pavement needs to have good bonding performance and shear resistance with a lower bearing layer, and because asphalt viscosity is not high, bonding strength of a cover surface and an old road surface is low or shear strength of the cover surface is not high, diseases such as falling, peeling, pushing, loosening and the like are easy to occur, the research on high-viscosity modified asphalt mixture and high-shear thin-layer cover surface is widely concerned.
In the prior art, the chinese patent with application number 201910648879.3 discloses a white-plus-black pavement structure using high-viscosity modified asphalt, which comprises an original cement concrete pavement, a high-viscosity modified emulsified asphalt bonding layer and a modified asphalt thin-layer overlay, and is used for a white-plus-black overlay of a pavement and a bridge deck, wherein the dynamic viscosity and the elastic recovery of the modified asphalt at 60 ℃ are relatively low, and the cohesive force of a mixture, the drawing performance and the shearing resistance of the overlay are not considered. The invention patent of China with application number 201711433431.7 discloses a cold-mix cold-spread asphalt mixture and a cold-mix cold-spread asphalt mixture wearing layer, wherein the mixture is composed of coarse and fine aggregates, modified emulsified asphalt, mineral fillers, water and liquid additives, and the wearing layer is used for preventive maintenance of a cover surface, wherein the drawing strength and the dynamic viscosity at 60 ℃ of evaporation residues of the modified emulsified asphalt are not excellent, and the shearing resistance of the cover surface is not considered yet. In addition, the Chinese patent with application number 201610207276.6 discloses a thin-layer pavement super-sticky wearing layer and a construction method thereof, wherein the wearing layer is composed of alkaline aggregate, modified emulsified asphalt, cement, water and liquid additive, and the wearing layer is used for preventive maintenance of the overlay, and the shearing resistance of the overlay is not considered yet.
Disclosure of Invention
In order to overcome the defects of the prior art, the first object of the invention is to provide a high-viscosity modified asphalt mixture which is a slurry mixture and has good fluidity, and can invade into cracks on the surface of an asphalt road so as to repair the cracks on the surface of the asphalt road and effectively inhibit new cracks from appearing on the asphalt road surface.
The second purpose of the invention is to provide an application of the high-viscosity modified asphalt mixture, which is to pave the high-viscosity modified asphalt mixture to form a pavement cover; the formed pavement cover surface has excellent anti-stripping, shearing, cracking and waterproof performances without being rolled by a road roller.
The first purpose of the invention can be achieved by adopting the following technical scheme: a high-viscosity modified asphalt mixture comprises the following components in parts by weight:
the grain size of the first aggregate is a, a is more than 5 and less than or equal to 8mm, the grain size of the second aggregate is b, b is more than 3 and less than or equal to 5mm, the grain size of the third aggregate is c, and c is more than 0 and less than or equal to 3 mm.
Further, the first, second and third aggregates are specially graded with the following particle size distribution:
a, the sieve mesh size is 8mm, and the aggregate passing rate is 100 percent;
b, the mesh size is 4.75mm, and the aggregate passing rate is 60-80%;
c, the mesh size is 2.36mm, and the aggregate passing rate is 32-52%;
d, the sieve mesh size is 1.18mm, and the aggregate passing rate is 20-38%;
e, the sieve pore size is 0.6mm, and the aggregate passing rate is 13-28%;
f, the sieve pore size is 0.3mm, and the aggregate passing rate is 10-22%;
g, the mesh size is 0.15mm, and the aggregate passing rate is 6-15%;
h, the sieve pore size is 0.075mm, and the aggregate passing rate is 4-10%.
Further, the first, second and third aggregates each include at least one of limestone, basalt, diabase, granite, quartzite and amphibole.
Further, the filler is at least one of road portland cement, slaked lime and limestone mineral powder.
Furthermore, the high-viscosity high-elasticity modified emulsified asphalt contains an SBS modifier and a tackifier; the mixing amount of the SBS modifier is more than or equal to 4.5 percent of the quality of the high-viscosity high-elasticity modified emulsified asphalt; the mixing amount of the tackifier is more than or equal to 1 percent of the quality of the high-viscosity high-elasticity modified emulsified asphalt.
Further, the tackifier is terpene resin or rosin.
Further, the high-viscosity high-elasticity modified emulsified asphalt is prepared by the following method: heating No. 70A-grade road petroleum asphalt to 180 ℃, adding an SBS modifier, a tackifier and a modification auxiliary agent, shearing at high speed by a shearing machine, adding a stabilizer after the SBS modifier is uniformly dispersed, fully stirring uniformly and curing to obtain SBS modified asphalt; dissolving emulsifier in water at 50-60 deg.C, adding hydrochloric acid to obtain soap solution, adjusting pH to 2-3, and heating SBS modified asphalt to 160 deg.C for emulsification to obtain high-viscosity high-elasticity modified emulsified asphalt.
Furthermore, the softening point of the evaporation residue of the high-viscosity high-elasticity modified emulsified asphalt is more than or equal to 85 ℃, the elastic recovery at 25 ℃ is more than or equal to 95%, the dynamic viscosity at 60 ℃ is more than or equal to 100000 pas, the kinematic viscosity at 135 ℃ is more than or equal to 6 pas, and the drawing strength is more than or equal to 1.0 MPa.
Further, the length of the glass fiber is 5-10 cm.
Further, the additive is at least one of an aliphatic quaternary ammonium salt additive and an aqueous coupling agent.
Further, 3-10 parts of water is also included.
The second purpose of the invention can be achieved by adopting the following technical scheme: the application of the high-viscosity modified asphalt mixture is that the high-viscosity modified asphalt mixture is paved and then flows automatically to form a pavement overlay.
Further, the paving thickness of the high-viscosity modified asphalt mixture is 0.8-2 cm.
Further, the spreading is carried out for multiple times, and after the high-viscosity modified asphalt mixture is demulsified after the previous spreading, the next spreading is carried out.
Compared with the prior art, the invention has the beneficial effects that:
1. the high-viscosity modified asphalt mixture is a slurry mixture, has good fluidity, and can invade into cracks on the surface of an asphalt road, so that the cracks on the surface of the asphalt road are repaired, and new cracks on the asphalt pavement are effectively inhibited;
2. the high-viscosity modified asphalt mixture can be used after being mixed at normal temperature, and compared with the traditional hot mixing technology, the energy can be saved by 80% and the carbon emission can be saved by 35kg per ton of the mixture;
3. the construction temperature of the high-viscosity modified asphalt mixture can reach-5 ℃, so that the proper construction temperature of the asphalt mixture is greatly expanded;
4. the high-viscosity modified asphalt mixture can be used for vehicle communication after being paved into a pavement cover and then maintained, and the pavement cover formed by the high-viscosity modified asphalt mixture has excellent anti-stripping, shearing, cracking and waterproof properties because the fluidity is good and the pavement cover does not need to be rolled by a road roller; compared with the traditional micro-surfacing and slurry sealing layer, the shear strength is improved by about 150 percent, and the expected service life of the cover surface is prolonged by 5 to 10 years;
5. the thickness of the pavement overlay obtained by the method is about 1cm, so that the using effect of the overlay with the thickness of 4cm can be achieved, and 75% of raw materials are saved.
Detailed Description
The invention will be further described with reference to specific embodiments:
a high-viscosity modified asphalt mixture comprises the following components in parts by weight:
the grain size of the first aggregate is a, a is more than 5 and less than or equal to 8mm, the grain size of the second aggregate is b, b is more than 3 and less than or equal to 5mm, the grain size of the third aggregate is c, and c is more than 0 and less than or equal to 3 mm.
Wherein the first aggregate, the second aggregate and the third aggregate adopt the special grading with the following particle size distribution:
a, the sieve mesh size is 8mm, and the aggregate passing rate is 100 percent;
b, the mesh size is 4.75mm, and the aggregate passing rate is 60-80%;
c, the mesh size is 2.36mm, and the aggregate passing rate is 32-52%;
d, the sieve mesh size is 1.18mm, and the aggregate passing rate is 20-38%;
e, the sieve pore size is 0.6mm, and the aggregate passing rate is 13-28%;
f, the sieve pore size is 0.3mm, and the aggregate passing rate is 10-22%;
g, the mesh size is 0.15mm, and the aggregate passing rate is 6-15%;
h, the sieve pore size is 0.075mm, and the aggregate passing rate is 4-10%.
Wherein the first aggregate, the second aggregate and the third aggregate comprise at least one of limestone, basalt, diabase, granite, quartzite and amphibole.
Wherein the filler is at least one of road portland cement (P.O 7.5.5), slaked lime and limestone mineral powder.
Wherein the high-viscosity high-elasticity modified emulsified asphalt contains an SBS modifier and a tackifier; the mixing amount of the SBS modifier is 5-8% of the mass of the high-viscosity high-elasticity modified emulsified asphalt; the mixing amount of the tackifier is 1.5-2% of the mass of the high-viscosity high-elasticity modified emulsified asphalt; the tackifier is terpene resin or rosin;
the high-viscosity high-elasticity modified emulsified asphalt is prepared by the following method: heating No. 70A-grade road petroleum asphalt to 180 ℃, adding an SBS modifier, a tackifier and polyalkylphenol disulfide (a modification auxiliary), shearing at high speed for 1h by a shearing machine, adding a stabilizer after the SBS modifier is uniformly dispersed, fully and uniformly stirring, and curing for 1h to obtain SBS modified asphalt; dissolving emulsifier in water at 50-60 deg.C, adding hydrochloric acid to obtain soap solution, adjusting pH to 2-3, and heating SBS modified asphalt to 160 deg.C for emulsification to obtain high-viscosity high-elasticity modified emulsified asphalt. The performance of evaporation residues of the high-viscosity high-elasticity modified emulsified asphalt reaches PG76-22 grade of PG classification of pavement performance of an asphalt binder, the softening point of the evaporation residues is more than or equal to 85 ℃, the elastic recovery at 25 ℃ is more than or equal to 95%, the dynamic viscosity at 60 ℃ is more than or equal to 100000 pas, the kinematic viscosity at 135 ℃ is more than or equal to 6 pas, and the drawing strength is more than or equal to 1.0 MPa. The higher the viscosity, the poorer the fluidity. The invention improves the viscosity, and keeps good fluidity.
Wherein the length of the glass fiber is 5-10 cm;
wherein the additive is aliphatic quaternary ammonium salt additive or aqueous coupling agent.
The cohesive force of the high-viscosity modified asphalt mixture is more than or equal to 1.5 N.m after 30min, and the cohesive force is more than or equal to 2.5 N.m after 60 min.
The application of the high-viscosity modified asphalt mixture comprises the steps of mixing the high-viscosity modified asphalt mixture at normal temperature, paving the mixture to the thickness of 0.8-2cm, and automatically flowing and forming to form a pavement cover surface; the paving can be carried out for multiple times, and after the high-viscosity modified asphalt mixture is demulsified after the previous paving, the next paving is carried out.
The formed pavement overlay is not required to be rolled and molded by a road roller, and the final molding thickness of the finished pavement overlay after maintenance is 0.5-1.6cm after the vehicle is turned on; the drawing strength of the cover surface is more than or equal to 0.3MPa, and the shearing strength is more than or equal to 0.7 MPa; the overlay can repair the cracks on the asphalt pavement, the width of the cracks is not more than 1.5cm, the rutting depth of the asphalt pavement is 0-4cm, and new cracks on the asphalt pavement are effectively inhibited.
Examples 1 to 3:
the high-viscosity modified asphalt mixtures of examples 1 to 3 had the components in parts by weight shown in table 1:
TABLE 1 parts by weight of the components of examples 1-3
The specific grading of the particle size distribution of the first, second and third aggregates is shown in table 2:
TABLE 2 Special grading of aggregates
The mixing amount of the SBS modifier and the tackifier in the high-viscosity high-elasticity modified emulsified asphalt is as shown in the table 3:
table 3 blending amount (% of SBS modifier and tackifier)
The remaining features are the same as the detailed description.
The high-viscosity high-elasticity modified emulsified asphalt of examples 1 to 3 was subjected to performance testing, and the characteristics of the testing data are shown in Table 4:
table 4 high-viscosity high-elasticity modified emulsified asphalt property detection data
The softening point of asphalt evaporation residues and the dynamic viscosity at 60 ℃ are important indexes for evaluating the high-temperature stability of asphalt, and the asphalt has better high-temperature stability when the numerical value is larger. The 25 ℃ elastic recovery is an important index for evaluating the resilience performance of the asphalt, and the larger the value is, the better the anti-reflection cracking, low-temperature cracking and fatigue cracking performances of the asphalt are.
The results in table 4 show that the indexes of the high-viscosity high-elasticity modified emulsified asphalt adopted by the invention are far higher than those of the industrial standard and the common modified emulsified asphalt, which indicates that the high-viscosity high-elasticity modified emulsified asphalt has far higher high-temperature stability, reflection cracking resistance, low-temperature cracking resistance and fatigue cracking resistance than the common modified emulsified asphalt.
The high-viscosity modified asphalt mixtures of examples 1 to 3 were subjected to performance testing, and the testing characteristics are shown in table 5:
TABLE 5 high-viscosity modified asphalt mixture Performance test data
The high-viscosity modified asphalt mixtures of examples 1 to 3 were mixed at normal temperature and then spread to form road surface covers, and the performance of the road surface covers was measured, and the results are shown in table 6:
TABLE 6 EXAMPLES 1-3 Performance test data for prepared pavement coverings
The pendulum value of the friction coefficient is measured by a pendulum instrument, the local microcosmic structural condition of the road surface is reflected, and the larger the pendulum value is, the better the anti-skid performance is; the water seepage coefficient refers to the volume of water seeping into a specified area of a road surface in unit time under a specified initial water head pressure, and the smaller the numerical value, the better the water resistance is; the flatness refers to data of difference between uneven surface and absolute level of a road surface, the smaller the numerical value is, the better the flatness is, the shear strength refers to the shear strength value of the pavement overlay under the action of torsional shear, the larger the shear strength is, the better the high-temperature stability of the overlay is, and the better the rutting resistance, the pushing resistance and the skid resistance are.
Various other changes and modifications to the above-described embodiments and concepts will become apparent to those skilled in the art from the above description, and all such changes and modifications are intended to be included within the scope of the present invention as defined in the appended claims.
Claims (7)
1. The high-viscosity modified asphalt mixture is characterized by comprising the following components in parts by weight:
25-35 parts of first aggregate;
20-30 parts of second aggregate;
35-55 parts of third aggregate;
0-3 parts of a filler;
9-15 parts of high-viscosity high-elasticity modified emulsified asphalt;
0-0.3 part of glass fiber;
0-3 parts of an additive;
3-10 parts of water;
the grain size of the first aggregate is a, a is more than 5 and less than or equal to 8mm, the grain size of the second aggregate is b, b is more than 3 and less than or equal to 5mm, the grain size of the third aggregate is c, and c is more than 0 and less than or equal to 3 mm;
the high-viscosity high-elasticity modified emulsified asphalt contains an SBS modifier and a tackifier; the mixing amount of the SBS modifier is more than or equal to 4.5 percent of the quality of the high-viscosity high-elasticity modified emulsified asphalt; the mixing amount of the tackifier is more than or equal to 1 percent of the quality of the high-viscosity high-elasticity modified emulsified asphalt;
the high-viscosity high-elasticity modified emulsified asphalt is prepared by the following method:
heating No. 70A-grade road petroleum asphalt to 180 ℃, adding an SBS modifier, a tackifier and a modification auxiliary agent, shearing at high speed by a shearing machine, adding a stabilizer after the SBS modifier is uniformly dispersed, fully stirring uniformly and curing to obtain SBS modified asphalt; dissolving an emulsifier in water at 50-60 ℃, adding hydrochloric acid to prepare a soap solution, adjusting the pH value to 2-3, and then heating SBS modified asphalt to 160 ℃ for emulsification to obtain high-viscosity high-elasticity modified emulsified asphalt;
the softening point of the evaporation residue of the high-viscosity high-elasticity modified emulsified asphalt is more than or equal to 85 ℃, the elastic recovery at 25 ℃ is more than or equal to 95%, the dynamic viscosity at 60 ℃ is more than or equal to 100000 pas, the kinematic viscosity at 135 ℃ is more than or equal to 6 pas, and the drawing strength is more than or equal to 1.0 MPa.
2. The high-viscosity modified asphalt mixture according to claim 1, wherein said first, second and third aggregates are specially graded with the following particle size distributions:
a, the sieve mesh size is 8mm, and the aggregate passing rate is 100 percent;
b, the mesh size is 4.75mm, and the aggregate passing rate is 60-80%;
c, the mesh size is 2.36mm, and the aggregate passing rate is 32-52%;
d, the sieve mesh size is 1.18mm, and the aggregate passing rate is 20-38%;
e, the sieve pore size is 0.6mm, and the aggregate passing rate is 13-28%;
f, the sieve pore size is 0.3mm, and the aggregate passing rate is 10-22%;
g, the mesh size is 0.15mm, and the aggregate passing rate is 6-15%;
h, the sieve pore size is 0.075mm, and the aggregate passing rate is 4-10%.
3. The high viscosity modified asphalt mixture according to claim 1, wherein the filler is at least one of road portland cement, slaked lime and limestone ore powder.
4. The high viscosity modified asphalt mixture according to claim 1, wherein the glass fiber has a length of 5 to 10 cm.
5. The high viscosity modified asphalt mixture according to claim 1, wherein said additive is at least one of an aliphatic quaternary ammonium salt additive and an aqueous coupling agent.
6. Use of a highly viscous modified asphalt mixture according to claim 1, wherein the highly viscous modified asphalt mixture is formed into a road surface finish by self-flowing after being spread.
7. The use of the high-viscosity modified asphalt mixture according to claim 6, wherein the paving thickness of the high-viscosity modified asphalt mixture is 0.8-2 cm.
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| CN112250348B (en) * | 2020-11-18 | 2021-10-08 | 同济大学 | Porous red mud asphalt pavement material for purifying runoff pollutants and preparation and application thereof |
| CN114772980B (en) * | 2022-04-21 | 2023-06-23 | 天津市交通运输基础设施养护集团有限公司 | High-viscosity cold-mixed cold-laid fine and thin-overlay asphalt concrete and preparation method thereof |
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