CN112300587A - Composite rubber asphalt, mixture thereof and high-crack-resistant and anti-rutting three-layer rubber asphalt pavement structure containing mixture - Google Patents

Composite rubber asphalt, mixture thereof and high-crack-resistant and anti-rutting three-layer rubber asphalt pavement structure containing mixture Download PDF

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Publication number
CN112300587A
CN112300587A CN202011325951.8A CN202011325951A CN112300587A CN 112300587 A CN112300587 A CN 112300587A CN 202011325951 A CN202011325951 A CN 202011325951A CN 112300587 A CN112300587 A CN 112300587A
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China
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rubber asphalt
asphalt
layer
passing rate
surface layer
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Inventor
黄慧
熊剑平
张洪刚
谭华
张红波
谭继宗
王彬
刘卫东
张仰鹏
禤炜安
陈杰
王秋敏
焦晓东
冯明珠
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Guangxi Jiaoke New Materials Technology Co ltd
Guangxi Jiaoke Group Co Ltd
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Guangxi Jiaoke New Materials Technology Co ltd
Guangxi Jiaoke Group Co Ltd
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Priority to CN202011325951.8A priority Critical patent/CN112300587A/en
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L95/00Compositions of bituminous materials, e.g. asphalt, tar, pitch
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02Macromolecular compounds
    • C04B26/26Bituminous materials, e.g. tar, pitch
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C7/00Coherent pavings made in situ
    • E01C7/08Coherent pavings made in situ made of road-metal and binders
    • E01C7/32Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00Properties
    • C08L2201/08Stabilised against heat, light or radiation or oxydation

Abstract

The invention discloses composite rubber asphalt which is prepared from rubber powder, matrix asphalt, graphite and diatomite. The invention also provides a composite rubber asphalt mixture prepared from the composite rubber asphalt and the aggregate. In addition, the invention also provides a high-crack-resistant and anti-rutting three-layer rubber asphalt pavement structure containing the mixture. The pavement structure comprises a compact framework embedded and extruded rubber asphalt concrete upper surface layer, a thick framework embedded and extruded compact rubber asphalt concrete middle surface layer and an anti-segregation embedded and extruded framework extruded compact rubber asphalt lower surface layer which are sequentially paved from top to bottom. The pavement structure can comprehensively improve the performances of fatigue deformation resistance, crack resistance, rut resistance and the like of the pavement, pertinently solve a series of problems of fatigue cracking caused by surface layer aging, pavement reflection cracking caused by base layer cracking and the like, relieve the environmental and economic pressure of the increasing waste tires, and greatly reduce the resource consumption and the construction and maintenance cost of the pavement in the whole life cycle. Has good economic and social benefits.

Description

Composite rubber asphalt, mixture thereof and high-crack-resistant and anti-rutting three-layer rubber asphalt pavement structure containing mixture
Technical Field
The invention relates to the field of road and traffic transportation engineering, in particular to a composite rubber asphalt, a mixture thereof and a high-crack-resistant and anti-rutting three-layer rubber asphalt pavement structure containing the mixture.
Background
The ever-increasing proliferation of waste tires has placed a tremendous pressure on the global ecological environment. Waste tires belong to harmful solid wastes, and improper disposal of the waste tires seriously affects human health and endangers the safety of ecological environment. According to incomplete statistics, the production of waste tires in China in 2017 is over 1300 million tons, and the production of the waste tires is increased by 6-8% every year, and the production of the waste tires is expected to be over 2000 million tons by 2020. Therefore, the development of the waste tire ecological recycling technology and the sustainable development research work have obvious environmental protection and economic benefits.
As a material with good performance, the rubber asphalt not only consumes waste tires, but also has good high and low temperature performance, so that the requirement of highway construction can be effectively met. According to incomplete statistics, rubber asphalt has been used for nearly thousands of kilometers in major road works throughout the country. The rubber asphalt pavement has obvious environmental protection significance, technical prospects (prolonging the service life of the pavement, delaying reflection cracks, reducing noise, excellent flexibility and the like) and potential economic value (being capable of properly reducing the thickness of the pavement), so that the rubber asphalt pavement is popularized and applied in a large scale. At present, the rubber asphalt pavement is mainly applied as follows: the rubber asphalt pavement, the rubber asphalt composite pavement and the old cement pavement are directly paved with a thin rubber asphalt overlay, the municipal road maintenance is paved with a rubber asphalt overlay, and the single-layer or double-layer rubber asphalt technology shows good application effects. However, the rubber asphalt prepared by the pure tire rubber formula has defects in high-temperature stability, adhesiveness and workability, and modification or addition of other additives is required when the rubber asphalt is used for road asphalt.
Under the conditions that the traffic volume is increasing day by day and the heavy-load overload phenomenon is getting more and more severe, the asphalt pavement of the high-grade road has various early diseases such as cracks, pits, ruts and the like shortly after the traffic operation. Particularly, in southern China, in humid and hot areas, under the conditions of high temperature and heavy traffic, because the high temperature stability of the asphalt concrete is insufficient, the track disease of the asphalt pavement is particularly prominent, the comfort and safety of driving of the asphalt pavement are greatly influenced, and the service performance of the asphalt pavement is reduced.
In order to improve the high and low temperature performance and the anti-rutting capability of the pavement structure, in the prior art, for example, a rubber asphalt pavement structure with application number 201720341592.2, the pavement structure is a two-layer composite structure consisting of an upper rubber asphalt granule type asphalt concrete surface layer of rubber powder complexing agent and a lower rubber granule type asphalt concrete surface layer of rubber powder complexing agent, which can improve the pavement performance of the pavement and reduce the engineering cost, but the rubber asphalt pavement structure proposed by the technical scheme does not make detailed and specific explanation on the structural composition and performance and does not have the implementation property of popularization and application. The application number is 201920894893.7 bituminous paving protects structure with function of anti-cracking, its road surface structure includes curb piece, main pitch layer, semi-rigid base layer, soil and anti-crack subsides, and this road surface structure increases the intensity of pitch and its and bituminous mixture's compatibility through setting up glass fiber geogrid, improves the tensile strength on road surface, increases the anti-crack ability on road surface, and this technical scheme does not carry out the contrast verification to the anti-crack effect of the scheme that proposes.
The paper 'evaluation of the reflection crack resistance of the asphalt mixture based on the Overlay Tester test' proposes that the Overlay Tester test is used for evaluating the reflection crack resistance of different types of asphalt mixtures, and an effective test evaluation means is provided for evaluating the crack resistance of the asphalt mixture of the additionally paved cement pavement. In the thesis of research on the anti-reflection crack performance of the rubber asphalt mixture, an Overlay Tester test is adopted to research the anti-reflection crack performance of the rubber asphalt mixture, and the research finds that the anti-reflection crack performance of the asphalt mixture can be obviously improved by the rubber asphalt, and the stress loss rate and the crack propagation rate show a positive correlation relationship.
Therefore, considering the service life of the whole structure of the road and the major and middle repair period, it is necessary to research a novel rubber asphalt and an asphalt road structure formed by mixing the asphalt with aggregate, how to obtain the asphalt, and set the asphalt dosage, the gradation composition, the mineral aggregate gap degree and the saturation degree to make the asphalt achieve a better road structure configuration, so that the technical performance and the economic performance of the rubber asphalt can be fully exerted, the resource consumption and the construction cost of the whole life period of the road can be reduced, and the comprehensive performances of the road such as rutting resistance, reflection crack resistance and the like can be obviously improved, which is a practical problem faced by people at present and needs to be solved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the composite rubber asphalt with good high-temperature resistance.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the composite rubber asphalt comprises the following raw materials in percentage by mass: 18-23% of rubber powder, 70-82% of matrix asphalt, 0.1-5% of graphite and the balance of diatomite.
Preferably, the particle size of the rubber powder is 30-60 meshes.
Preferably, the base asphalt is road petroleum asphalt.
Preferably, the preparation method comprises the following steps:
(a1) respectively grinding the diatomite and the graphite, and sieving the ground diatomite and the graphite by a 200-mesh sieve for later use;
(a2) putting the matrix asphalt into a reaction kettle, heating and pressurizing while stirring, keeping constant pressure when the temperature is increased to 170-180 ℃, and continuously stirring for 25-30 min;
(a3) adding rubber powder into the substrate asphalt in the step (a2), heating to 190 ℃ and 200 ℃, adjusting the pressure to 0.6-0.7MPa, continuing to stir for 50-70min, then adding the rest raw materials, pressurizing to 0.8-0.9MPa, and continuing to stir for 15-30min to obtain the asphalt.
Preferably, the rotation speed of the stirring in the step (a2) is 700-.
Preferably, step (a2) controls the pressure to be not greater than 0.5 MPa.
The invention also provides a composite rubber asphalt mixture prepared by mixing the composite rubber asphalt and aggregate, wherein the oilstone ratio of the mixture is 4.2-5.9%, and the specific preparation method comprises the following steps:
(b1) heating the aggregate to not less than 170 ℃;
(b2) spraying the composite rubber asphalt with the temperature of 140-145 ℃ into the aggregate, and stirring for 1.5-3min to obtain the composite rubber asphalt.
Preferably, the heating temperature of the aggregate in the step (b1) is 180-185 ℃.
The invention also aims to provide a high-crack-resistant and anti-rutting three-layer rubber asphalt pavement structure by utilizing the composite rubber asphalt mixture aiming at the series of problems of cracking, rutting, reflection cracking and the like easily occurring in the existing pavement structure.
The pavement structure comprises a compact skeleton embedded and extruded rubber asphalt concrete upper surface layer, a thick skeleton embedded and extruded compact rubber asphalt concrete middle surface layer and an anti-segregation embedded and extruded skeleton extruded compact rubber asphalt lower surface layer which are sequentially paved on a soil foundation from top to bottom.
Preferably, the thickness of the upper surface layer of the compact skeleton embedded and extruded rubber asphalt concrete is 4-5 cm; the oil-stone ratio is 5.8-5.9%.
Preferably, the 9.5mm passing rate of the key sieve pore, the 25-35% passing rate of the 4.75mm sieve pore, the 20-25% passing rate of the 2.36mm sieve pore and the 3-6% passing rate of the 0.075mm sieve pore of the aggregate used for the upper layer of the compact skeleton embedded and extruded rubber asphalt concrete.
Preferably, the thickness of the surface layer in the coarse framework embedded compaction type rubber asphalt concrete is 5-7cm, and the oilstone ratio is 4.8-4.9%.
Preferably, the 19mm passing rate of the key sieve pores, the 60-70% passing rate of the 13.2mm sieve pores, the 45-55% passing rate of the 9.5mm sieve pores, the 28-38% passing rate of the 4.75mm sieve pores, the 20-25% passing rate of the 2.36mm sieve pores and the 4-5.5% passing rate of the 0.075mm sieve pores of the aggregate used for the surface layer in the coarse-type framework embedded compaction type rubber asphalt concrete.
Preferably, the thickness of the lower surface layer of the segregation-resistant embedded and extruded framework compact rubber asphalt is 6-8cm, and the oilstone ratio is 4.2-4.3%.
The maximum nominal grain diameter of the aggregate used in the lower layer of the segregation-resistant embedded and extruded skeleton-extruded rubber asphalt is 95% +/-3% of sieve pores, the passing rate of 19mm of key sieve pores is 75-82%, the passing rate of 9.5mm of sieve pores is 40-50%, the passing rate of 4.75mm of sieve pores is 25-33%, the passing rate of 2.36mm of sieve pores is 17-23%, and the passing rate of 0.075mm of sieve pores is 3.5-5%.
Preferably, the pavement structure further comprises a modified emulsified asphalt binder layer between each layer.
Preferably, a base layer is further arranged between the lower surface layer of the anti-segregation embedded and extruded skeleton compaction type rubber asphalt and the soil base.
Preferably, the coarse aggregate of the aggregate used for the upper layer of the compact skeleton embedded and extruded rubber asphalt concrete is diabase and/or basalt, the fine aggregate is limestone machine-made sand, and the filler is mineral powder.
Preferably, aggregate coarse aggregate used for the middle surface layer of the coarse framework embedded compaction type rubber asphalt concrete and the lower surface layer of the anti-segregation embedded compaction type rubber asphalt is limestone, fine aggregate is limestone machine-made sand, and filler is mineral powder.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. the diatomite and the graphite are introduced into the composite rubber asphalt, and the diatomite is used as an inorganic particle filler, so that the dynamic stability of the asphalt can be greatly improved, and the low-temperature crack resistance and the water stability of the asphalt are better. The heat conductivity coefficient of the graphite in the XY direction is high, and the graphite is doped in the rubber asphalt, so that the early damage of the asphalt pavement can be reduced, the quality of the asphalt pavement is improved, and the service life of the asphalt pavement is prolonged. And the graphite can be directly eaten after being ground without being processed to the degree of graphene or adding a dispersing agent, so that the preparation process is simple and easy.
2. The invention adopts the mixture obtained by mixing the composite rubber asphalt and the aggregates with different grades to prepare the high-crack-resistance and anti-rutting three-layer rubber asphalt pavement structure, wherein the upper, middle and lower layers of the pavement structure respectively adopt a compact framework embedded and extruded mixture, a coarse framework embedded and extruded compact mixture and an anti-segregation embedded and extruded framework extruded compact mixture. The three-layer rubber asphalt mixture can fully exert the technical characteristics and pavement performance of the rubber asphalt, can greatly improve the fatigue deformation resistance, the rutting resistance and the crack resistance of the whole asphalt surface layer, and meets the requirements of durable and long-life asphalt. Meanwhile, the same asphalt material is uniformly used for the asphalt surface layer, so that material scheduling and construction organization are facilitated, and the construction stability and the construction progress of the asphalt pavement are improved.
3. The invention adopts the rubber asphalt, can more effectively utilize waste tire resources, greatly reduce environmental pollution, save engineering materials such as asphalt and the like, and greatly prolong the service life of the asphalt pavement. In the material unit price, the unit price of the rubber (modified) asphalt is 300-400 yuan/ton lower than that of the SBS modified asphalt material, and the rubber (modified) asphalt has considerable economy; the total cost of the engineering of the three-layer rubber asphalt surface layer is reduced by about 1-2% compared with the total cost of the engineering adopting SBS modified asphalt, and has certain advantages.
Therefore, the pavement structure takes the control of the key sieve mesh passing rate as the control index of the optimization design, the optimization design is carried out on the graded composition, the performances of fatigue deformation resistance, crack resistance, rut resistance and the like of the pavement are comprehensively improved, a series of problems of pavement reflection cracks and the like caused by fatigue cracking of surface layer aging and base layer cracking are pertinently solved, the performances of rut resistance, reflection crack resistance and the like of the pavement can be obviously improved, the environmental and economic pressure of processing daily-increased waste tires can be relieved, and the resource consumption and the building and maintenance cost of the pavement in the whole life cycle are greatly reduced. Compared with SBS modified asphalt, the total construction cost of rubber asphalt has certain economic advantages, the recycling of rubber has social benefits of low carbon and environmental protection, effectively solves the problem of environmental pollution caused by waste rubber, prolongs the service life of the whole structure of the pavement and the large and medium repair period by times, greatly reduces the resource consumption and the construction and maintenance cost of the whole life period of the pavement, and has good economic benefits and social benefits.
Drawings
Fig. 1 is a schematic cross-sectional structure view of the pavement structure of the present invention.
In the attached drawings, 1-a compact framework embedded and extruded rubber asphalt concrete upper surface layer, 2-a coarse framework embedded and extruded compact rubber asphalt concrete middle surface layer and 3-an anti-segregation embedded and extruded framework extruded compact rubber asphalt lower surface layer. 4-basal layer, 5-soil base.
The modified emulsified asphalt bond is not shown in fig. 1 because the thickness of the modified emulsified asphalt bond is negligible.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
Example 1
The composite rubber asphalt comprises the following raw materials in percentage by mass: 18% of waste tire rubber powder of 30 meshes, 78% of road petroleum asphalt, 0.1% of graphite and the balance of diatomite. The preparation method comprises the following steps:
(a1) respectively grinding the diatomite and the graphite, and sieving the ground diatomite and the graphite by a 200-mesh sieve for later use;
(a2) putting the road petroleum asphalt into a reaction kettle, stirring at the rotating speed of 1000rpm, uniformly heating and pressurizing, controlling the maximum pressure to be not more than 0.5MPa, and continuing stirring for 30min when the temperature is raised to 170 ℃;
(a3) adding waste tire rubber powder into the road petroleum asphalt in the step (a2), heating to 200 ℃, adjusting the pressure to 0.6MPa, continuing to stir for 70min, then adding the rest raw materials, pressurizing to 0.8MPa, and continuing to stir for 30min to obtain the asphalt.
Example 2
The composite rubber asphalt comprises the following raw materials in percentage by mass: 23% of waste tire rubber powder with 50 meshes, 70% of road petroleum asphalt, 5% of graphite and the balance of diatomite. The preparation method comprises the following steps:
(a1) respectively grinding the diatomite and the graphite, and sieving the ground diatomite and the graphite by a 200-mesh sieve for later use;
(a2) putting the road petroleum asphalt into a reaction kettle, stirring at the rotating speed of 800rpm, uniformly heating and pressurizing, controlling the maximum pressure to be not more than 0.45MPa, and continuing stirring for 27min when the temperature is raised to 176 ℃;
(a3) adding waste tire rubber powder into the road petroleum asphalt in the step (a2), heating to 195 ℃, adjusting the pressure to 0.65MPa, continuing to stir for 60min, then respectively spraying the rest raw materials through a spray gun, pressurizing to 0.84MPa, and continuing to stir for 20min to obtain the asphalt.
Example 3
The composite rubber asphalt comprises the following raw materials in percentage by mass: 20% of 60-mesh waste tire rubber powder, 73% of road petroleum asphalt, 2% of graphite and the balance of diatomite. The preparation method comprises the following steps:
(a1) respectively grinding the diatomite and the graphite, and sieving the ground diatomite and the graphite by a 200-mesh sieve for later use;
(a2) putting the road petroleum asphalt into a reaction kettle, stirring at the rotating speed of 700rpm, uniformly heating and pressurizing, controlling the maximum pressure to be not more than 0.5MPa, and continuing stirring for 25min when the temperature is increased to 180 ℃;
(a3) adding waste tire rubber powder into the road petroleum asphalt in the step (a2), heating to 190 ℃, adjusting the pressure to 0.6MPa, continuing to stir for 50min, then respectively spraying the rest raw materials through a spray gun, pressurizing to 0.9MPa, and continuing to stir for 15min to obtain the asphalt.
Example 4
The asphalt mixture has an oil-stone ratio of 4.3%, and the aggregate of the mixture adopts limestone as coarse aggregate, limestone machine-made sand as fine aggregate and mineral powder as filler. The preparation method of the mixture comprises the following steps: the aggregate is mixed evenly, heated to 170 ℃, then sprayed into the composite rubber asphalt and the aggregate of the embodiment 1 (at 140 ℃), and mixed and stirred for 1.5min, thus obtaining the asphalt mixture.
Example 5
The asphalt mixture has an oil-stone ratio of 4.8%, and the aggregate of the mixture adopts limestone as coarse aggregate, limestone machine-made sand as fine aggregate and mineral powder as filler. The preparation method of the mixture comprises the following steps: and (3) uniformly mixing the aggregate, heating to the temperature of 180 ℃, spraying the composite rubber asphalt and the aggregate (the temperature is 142 ℃) in the embodiment 2, and stirring for 2.5min to obtain the composite rubber asphalt.
Example 6
The asphalt mixture has an oil-stone ratio of 5.8%, and the aggregate of the mixture adopts diabase as coarse aggregate, limestone machine-made sand as fine aggregate and mineral powder as filler. The preparation method of the mixture comprises the following steps: the aggregate is mixed evenly, heated to 185 ℃, then sprayed into the composite rubber asphalt and the aggregate of the embodiment 3 (the temperature is 145 ℃) and mixed for 3min, thus obtaining the asphalt mixture.
Example 7
A three-layer rubber asphalt pavement structure with high crack resistance and track resistance is shown in figure 1 and comprises a compact framework embedded and extruded rubber asphalt concrete upper surface layer 1(4cm), a thick framework embedded and extruded compact rubber asphalt concrete middle surface layer 2(5cm) and an anti-segregation embedded and extruded framework embedded and extruded compact rubber asphalt lower surface layer 3(7cm) which are sequentially paved on a soil foundation 5 from top to bottom, and a modified emulsified asphalt adhesive layer (not shown in the figure) is further arranged between the surface layers. A base layer 4 is also arranged between the lower surface layer 3 of the anti-segregation embedded and extruded skeleton compaction type rubber asphalt and the soil foundation 5. The base course 4 described in this embodiment is a general base course used for a conventional asphalt road.
In this embodiment, the upper layer 1 of the tight-skeleton-embedded rubber asphalt concrete is made of the composite rubber asphalt mixture of embodiment 6 and is composed of discontinuous tight-skeleton-embedded graded composition. The middle layer 2 of the coarse framework embedded compaction type rubber asphalt concrete adopts the composite rubber asphalt mixture of the embodiment 5 and is composed of coarse framework embedded compaction type gradation. The lower layer 3 of the segregation-resistant embedded and extruded framework compact rubber asphalt adopts the composite rubber asphalt mixture of the example 4 and is composed of segregation-resistant framework embedded and extruded compact grading. The specific gradation of the 3-face mix is shown in table 1.
When the asphalt mixture is paved, the paving temperature of the mixture is 175 ℃ for high-temperature and 175 ℃, the rolling temperature is 165 and 170 ℃, a combined scheme of a double-steel-wheel vibratory roller and a tire roller is adopted, and a rolling mode of high-temperature, timely, immediately following and slow rolling is adopted, the rolling times of steel wheel primary pressing static pressure 1 time, steel wheel vibratory rolling 3 times, rubber wheel synchronous rolling 2 times and steel wheel static pressure final pressing 1 time are controlled, so that a multi-stage embedded and extruded framework compact structure is formed among aggregates in the asphalt mixture to improve the compaction quality of the asphalt mixture.
TABLE 1 composition of rubber-asphalt mixture
Comparative example 1
A pavement structure comprises an AC-13C asphalt concrete upper surface layer, an AC-20C asphalt concrete middle surface layer and an AC-25C asphalt concrete lower surface layer.
The upper layer of the AC-13C asphalt concrete adopts SBS modified asphalt mixture with 4.8 percent of oilstone ratio; the surface layer of the AC-20C asphalt concrete adopts SBS modified asphalt mixture with 4.3% of oilstone ratio; the lower surface layer of the AC-25C asphalt concrete adopts road petroleum asphalt mixture with the oil-stone ratio of 3.9 percent, and the grading composition of the upper surface layer, the middle surface layer and the lower surface layer of the pavement structure is shown in Table 2.
TABLE 2 asphalt mixture gradation composition
Comparative example 2
A pavement structure comprises an SMA-13 asphalt concrete upper surface layer, an AC-20C asphalt concrete middle surface layer and an AC-25C asphalt concrete lower surface layer.
The upper layer of the SMA-13 asphalt concrete adopts SBS modified asphalt mastic macadam mixture with 5.8% of oil-stone ratio; the SBS of the surface layer in the AC-20C asphalt concrete adopts a modified asphalt mixture with an oilstone ratio of 4.3 percent; the lower surface layer of the AC-25C asphalt concrete adopts road petroleum asphalt mixture with 3.8 percent of oil-stone ratio, and the grading composition of the upper surface layer, the middle surface layer and the lower surface layer of the pavement structure is shown in Table 3.
TABLE 3 asphalt mixture gradation composition
Rut test
The asphalt mixtures of example 7, comparative example 1 and comparative example 2 were subjected to a 60 ℃ rut test, and the results are shown in table 4.
TABLE 4 Rut test results
Note: the specification of Table 4 is "road asphalt pavement construction technical Specification" (JTGF40-2004)
As shown in Table 4, example 7 is one of the three-layer rubber asphalt pavement structures with high crack resistance and rutting resistance proposed by the invention, and comparative examples 1-2 are the pavement structures which are generally adopted at present. According to the analysis of 60 ℃ rut test results, the following results are found: the 60 ℃ rutting test results of the asphalt mixture for the pavement structures of example 7 and comparative examples 1-2 both satisfy the requirements of road engineering asphalt and asphalt mixture test regulations (JTG E20-2011), "rubber asphalt pavement construction technical Specification (DB 45/T1098-. The difference of the 60 ℃ rutting test results of the asphalt mixtures of the surface layers in the embodiment 7 is small, and the 60 ℃ rutting test results of the asphalt mixtures of the surface layers of the pavement structure in the comparative examples 1-2 are changed in stages, which shows that the overall rutting resistance of the three-layer rubber asphalt pavement structure provided by the invention is superior to that of the pavement structure in the comparative examples 1-2.
Overlay Tester test
To compare the anti-reflective cracking performance of the pavement structures described in the examples and comparative examples, the anti-reflective cracking performance of the asphalt mixture was characterized using the Overlay Tester test. The asphalt mixtures of example 7 and comparative examples 1 to 2 were compacted and molded according to the composition of the gradation, and then cut into standard test pieces for the Overlay Tester (150mm long, 75mm wide, 38mm high), and the top, middle and bottom layers were sprayed with the viscous layer oil, and then left to mold. For more practical construction, the spreading amount of the oil in the adhesive layer is 1.3-1.5Kg/m2. The test results are shown in Table 5.
TABLE 5 Overlay Tester test results
Examples Cracking life (times) Stress loss ratio (%) Maximum load (KN) Rate of crack propagation
Example 7 2267 51.32 3.147 0.1021
Comparative example 1 1503 63.35 2.532 0.1798
Comparative example 2 1765 60.28 2.793 0.1623
The Overlay Tester test effectively evaluates the capability of the asphalt mixture for resisting reflection cracks by taking the stress loss rate as an evaluation index. As can be seen from Table 5, the cracking life of example 7 is longer than that of comparative examples 1-2, the stress loss rate and the crack propagation rate are both lower than those of comparative examples 1-2, and the stress loss rate and the crack propagation rate show a positive correlation, indicating that the low-temperature crack resistance of the three-layer rubberized asphalt pavement structure proposed by the present invention is higher than that of the pavement structure of comparative examples 1-2 having AC-13 and SMA-13 as the upper layers.
Therefore, the high-crack-resistance and anti-rutting three-layer rubber asphalt pavement structure has the advantages that the overall anti-rutting performance and the anti-reflection crack performance are superior to those of the conventional pavement structure in the comparative example.

Claims (10)

1. The composite rubber asphalt is characterized by comprising the following raw materials in percentage by mass: 18-23% of rubber powder, 70-82% of matrix asphalt, 0.1-5% of graphite and the balance of diatomite.
2. The compounded rubber asphalt according to claim 1, characterized in that the preparation method comprises the steps of:
(a1) respectively grinding the diatomite and the graphite, and sieving the ground diatomite and the graphite by a 200-mesh sieve for later use;
(a2) putting the matrix asphalt into a reaction kettle, heating and pressurizing while stirring, keeping constant pressure when the temperature is increased to 170-180 ℃, and continuously stirring for 25-30 min;
(a3) adding rubber powder into the substrate asphalt in the step (a2), heating to 190 ℃ and 200 ℃, adjusting the pressure to 0.6-0.7MPa, continuing to stir for 50-70min, then adding the rest raw materials, pressurizing to 0.8-0.9MPa, and continuing to stir for 15-30min to obtain the asphalt.
3. The composite rubber asphalt mixture is characterized in that the asphalt-stone ratio of the composite rubber asphalt mixture is 4.2-5.9%, the asphalt adopted in the mixture is the composite rubber asphalt of claim 1 or 2, and the preparation method comprises the following steps:
(b1) heating the aggregate to not less than 170 ℃;
(b2) spraying the composite rubber asphalt with the temperature of 140-145 ℃ into the aggregate, and stirring for 1.5-3min to obtain the composite rubber asphalt.
4. A three-layer rubber asphalt pavement structure with high crack resistance and track resistance is characterized by being prepared from the composite rubber asphalt mixture of claim 3; the pavement structure comprises a compact skeleton embedded and extruded rubber asphalt concrete upper surface layer (1), a coarse skeleton embedded and extruded compact rubber asphalt concrete middle surface layer (2) and an anti-segregation embedded and extruded skeleton extruded compact rubber asphalt lower surface layer (3) which are sequentially paved on a soil foundation (5) from top to bottom.
5. The high anti-crack and anti-rutting three-layer rubber asphalt pavement structure according to claim 4, characterized in that the thickness of the compact skeleton embedded and extruded rubber asphalt concrete upper surface layer (1) is 4-5 cm; the oil-stone ratio is 5.8-5.9%.
6. The high anti-crack and anti-rutting three-layer rubber asphalt pavement structure according to claim 4, wherein the aggregate used in the compact skeleton embedded extruded rubber asphalt concrete upper layer (1) has a key sieve pore 9.5mm passing rate of 60-70%, a sieve pore 4.75mm passing rate of 25-35%, a sieve pore 2.36mm passing rate of 20-25%, and a sieve pore 0.075mm passing rate of 3-6%.
7. The high-crack-resistant and anti-rutting three-layer rubber asphalt pavement structure according to claim 4, wherein the thickness of the surface layer (2) in the coarse framework embedded compaction type rubber asphalt concrete is 5-7cm, and the oilstone ratio is 4.8-4.9%.
8. The high-crack-resistant and anti-rutting three-layer rubber asphalt pavement structure as claimed in claim 4, wherein the aggregate used in the top layer (2) in the coarse framework-embedded compact rubber asphalt concrete has a critical sieve aperture 19mm passing rate of 88-92%, a sieve aperture 13.2mm passing rate of 60-70%, a sieve aperture 9.5mm passing rate of 45-55%, a sieve aperture 4.75mm passing rate of 28-38%, a sieve aperture 2.36mm passing rate of 20-25%, and a sieve aperture 0.075mm passing rate of 4-5.5%.
9. The high crack-resistant and rut-resistant three-layer rubber asphalt pavement structure according to claim 4, wherein the thickness of the segregation-resistant and extrusion-embedded skeleton-compacted rubber asphalt lower surface layer (3) is 6-8cm, and the oilstone ratio is 4.2-4.3%.
10. The high crack and rut resistant three-layer rubber asphalt pavement structure according to claim 4, wherein the aggregate used in the segregation-resistant, interlocking and crowded framework-type rubber asphalt lower layer (3) has a maximum nominal particle size of 26.5mm with a mesh passing rate of 95% ± 3%, a critical mesh passing rate of 75-82%, a mesh passing rate of 9.5mm of 40-50%, a mesh passing rate of 4.75mm of 25-33%, a mesh passing rate of 2.36mm of 17-23%, and a mesh passing rate of 0.075mm of 3.5-5%.
CN202011325951.8A 2020-11-24 2020-11-24 Composite rubber asphalt, mixture thereof and high-crack-resistant and anti-rutting three-layer rubber asphalt pavement structure containing mixture Pending CN112300587A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112878136A (en) * 2021-03-24 2021-06-01 合肥工业大学 Intersection rubber asphalt anti-rutting road surface detection and design method based on ground penetrating radar

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112878136A (en) * 2021-03-24 2021-06-01 合肥工业大学 Intersection rubber asphalt anti-rutting road surface detection and design method based on ground penetrating radar

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