EVA (ethylene-vinyl acetate copolymer)/SBS (styrene butadiene styrene segmented copolymer) compound modified asphalt stabilized crushed stone permeable base and paving method thereof

Abstract

The invention relates to an EVA (ethylene-vinyl acetate copolymer) / SBS (styrene butadiene styrene segmented copolymer) compound modified asphalt stabilized crushed stone permeable base and a paving method thereof. In the aspect of setting urban sewerage systems and expressway road materials, response to rainstorm drainage facility is hardly taken into consideration, and drainage is impeded when rainstorm happens. A paving material disclosed by the invention is prepared from a mixture which is formed by evenly stirring compound modified asphalt, wherein 4% of EVA and 2 to 3% of SBS are adulterated and open-graded crushed stone which is utilized as aggregate under the condition of 170 DEG C to 185 DEG C. Therefore, excellent performance of the mixture of the base is ensured, pavement performance of the base can be better played at the same time, and a function of utilizing the base to effectively draining water is achieved. Compared with an ordinary ATPB (asphalt treated permeable base),fatigue life, a softening point and low-temperature ducility of the EVA / SBS compound modified asphalt stabilized crushed stone permeable base disclosed by the invention are all remarkably improved; furthermore, the problems of poor fatigue durability, poor high-temperature stability, poor low-temperature crack resistance, no environmental friendliness and the like in the prior art can be effectively solved.

Description

Technical field [0001] The invention relates to the technical field of transportation engineering, in particular to an EVA / SBS composite modified asphalt stabilized gravel drainage base layer and a laying method thereof. Background technique [0002] Pavement base is divided into inorganic binder stabilized base and crushed and gravel base. It is the key structural layer to ensure the stability of the pavement structure. The quality and quality of its material and quality directly affect the quality and performance of the pavement. [0003] On April 2, 2015, the list of pilot cities for sponge city construction was officially announced. New and greater requirements have been put forward for urban road drainage design. Although my country has conducted a series of studies on drainage bases, such as graded gravel drainage bases, porous concrete drainage bases, and asphalt stabilized gravel drainage bases, they still There are many shortcomings. The drainage base layer using graded c...

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Problems solved by technology

The use of porous concrete drainage base has problems such as temperature shrinkage, plastic shrinkage, and drying shrinkage, which will cause transverse cracks on the surface of the base due to insufficient tensile strength, resulting in reflective cracks in the pavement surface; use asphalt stabilized macadam (ATPB) drainage base , although it has the advantages of good penetration and stability, but because of the small amount of asphalt, it is prone to peeling, durability and stability problems, and the tensile strength of this material is low, so the bending of the bottom of the structural layer The tensile stress is large and the service life is short. In addition, the open gradation of the ATPB mixture has a much larger void ratio than the dense gradation asphalt mixture. Under the load, it is easy to produce fatigue cracks.

[0004] In recent years, due to global temperature changes, rainy seasons often encounter rainstorms and floods in many provinces and cities, and because such weather conditions are rare, the urban drainage systems and highway road materials in various regions are set up. There are few considerations for the response of drainage facilities, which will cause unnecessary property losses, casualties and other phenomena due to poor drainage when heavy rain occurs

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