A kind of SBS modified asphalt concrete and preparation method thereof

Abstract

The invention relates to an SBS-modified asphalt concrete and a preparation method thereof, and relates to the technical field of pavement paving materials. The SBS-modified asphalt concrete comprises the following components in parts by weight: 300-500 parts of coarse and fine aggregates, 15-30 parts of asphalt, 1.5-3.5 parts of SBS and 0.5-1.5 parts of cross-linking agent particles; the cross-linking agent particles include the following components in parts by weight: 65-85 parts of liquid coumarone resin, 15-25 parts of sulfur, and 5-10 parts of chloroform and 1-2 parts of organotin stabilizer; the preparation method includes the following steps: S1. Preheating the asphalt first, and heating the asphalt to a softened state; S2. Putting SBS into the asphalt treated by S1, and stirring the two Evenly, modify the asphalt to obtain SBS modified asphalt; S3. Add coarse and fine aggregates and crosslinking agent particles to the SBS modified asphalt, and stir the mixture evenly at a speed of 40r / min to obtain a finished product. The concrete prepared by the invention has good stability and solves the problem of poor stability in the prior art.

Description

technical field [0001] The invention relates to the technical field of paving materials, in particular to a SBS modified asphalt concrete and a preparation method thereof. Background technique [0002] SBS is a styrene-butadiene block copolymerized thermoplastic elastomer, which has good processability and good fatigue resistance. Using SBS to modify ordinary petroleum asphalt is the mainstream modification technology of asphalt pavement in my country. Some existing research is to directly mix SBS modifier, matrix asphalt and aggregates in the mixing building to prepare modified asphalt concrete, but due to the high melting point of SBS, it is not easy to dissolve and disperse, this method has disadvantages It may reduce some properties of modified asphalt concrete and affect the paving effect. [0003] In order to solve this problem, in the existing SBS modified asphalt concrete, SBS and base asphalt are first subjected to high-speed shearing and ball milling to obtain SBS...

AI Technical Summary

Problems solved by technology

Some existing research is to directly mix SBS modifier, matrix asphalt and aggregates in the mixing building to prepare modified asphalt concrete, but due to the high melting point of SBS, it is not easy to dissolve and disperse, this method has disadvantages It may reduce some properties of modified asphalt concrete and affect the paving effect

However, the SBS modified asphalt prepared by this method has technical defects such as "modifier is easy to segregate" and "modifier thermal decomposition performance attenuation" during processing and storage, which easily leads to easy segregation and unstable stability of SBS modified asphalt concrete. good question

In order to solve this problem, the method of "vulcanization and cross-linking" is usually introduced into the modified asphalt concrete. Sulfur is used to vulcanize and cross-link the SBS modified asphalt system to improve the problem that the modifier is easy to segregate in the SBS modified asphalt concrete. However, sulfur In the SBS modified asphalt concrete system, the problem of uneven dispersion and agglomeration is prone to occur, which leads to the slowdown of the crosslinking speed between sulfur and SBS modified asphalt, and the improvement effect of this method is general, resulting in the existence of SBS modified asphalt concrete. Poor stability issues

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