摘要
For the resource utilization of the solid waste coking sulfur paste and the improvement of performance of the asphalt mixture,a method for preparing modified asphalt mixture with coking sulfur paste modifier(CSPM)is herein proposed.Compared with the matrix asphalt mixture,the Marshall stability of the 30%CSPM modified asphalt mixture increased by 38.3%,the dynamic stability increased by nearly one time(reaching 1847.5 times/mm),the splitting strength ratio increased by 39.3%while the splitting tensile strength decreased by 11.7%.After curing,the performance of the CSPM modified asphalt mixture was further improved.The results show that CSPM improved the high temperature stability and water damage resistance of the asphalt mixture,and the low-temperature anti-cracking performance of that was slightly reduced.Chemical analysis of asphalt binders shows that a little sulfur reacted with asphalt to produce polysulfide compounds(R-Sx-R′),and a part of sulfur existed in the form of crystalline sulfur which was further increased after curing.The presence of crystalline sulfur as an inorganic filler is the key point for improving the high temperature stability and water resistance performance of modified asphalt mixture.
为了资源化利用焦炉煤气净化脱硫过程中产生的固体废弃物焦化硫膏,并提高沥青混合料的路用性能,提出了以焦化硫膏为原料制备焦化硫膏沥青改性剂(CSPM)的方法。与基质沥青混合料相比,添加30%的CSPM制备改性沥青混合料的马歇尔稳定度提高了38.3%,动稳定度提高了近1倍(达到1847.5次/mm),劈裂强度比提高了39.3%,劈裂抗拉强度降低了11.7%。养护后,CSPM改性沥青混合料性能较养护前得到进一步提高。结果表明,添加30%的CSPM提高了沥青混合料的高温稳定性和抗水损害性能,但其低温抗裂性能略有下降。沥青胶结料的化学分析结果表明,少量的硫与沥青反应生成多硫化物(R-Sx-R′),部分硫以结晶硫的形式存在,并在养护后进一步增多。结晶硫作为无机填料是提高改性沥青混合料高温稳定性和耐水性的关键。
基金
Project(201703D321006)supported by the Shanxi Provincial Key Research and Development Project(Social Development),China。
