摘要
针对微表处常用的两类SBS、SBR改性乳化沥青混合料的相关性能展开研究,并对2.5%SBS+2.5%SBR复合乳化沥青混合料的路用性能进行了研究与应用。室内试验表明:相比于5%SBS、5%SBR改性乳化沥青,2.5%SBS+2.5%SBR复合改性乳化沥青综合性能最为优异;2.5%SBS+2.5%SBR复合改性乳化沥青混合料路用性能优异,三类乳化沥青混合料的耐磨耗、抗水损坏、抗车辙性能优劣排序:2.5%SBS+2.5%SBR>5%SBS>5%SBR;2.5%SBS+2.5%SBR复合改性乳化沥青混合料的耐磨耗性能提高不大,但抗水损坏性能得到了显著提高。工程应用表明:旧路在加铺2.5%SBS+2.5%SBR微表处罩面后,构造深度、摩擦系数及抗滑值较大,路面抗渗性能优异。
The related properties of two kinds of SBS and SBR modified emulsified asphalt mixtures commonly used in micro surfacing are studied,and the road performance of 2.5%SBS+2.5%SBR composite emulsified asphalt mixture is studied and applied.The indoor test shows that compared with 5%SBS and 5%SBR modified emulsified asphalt,the softening point of evaporation residue of 2.5%SBS+2.5%SBR composite modified emulsified asphalt is the highest,the penetration is the lowest,the ductility is between the two,and the comprehensive performance is the best.2.5%SBS+2.5%SBR composite modified emulsified asphalt mixture has excellent road performance.The ranking of wear resistance,water damage resistance and rutting resistance of the three types of emulsified asphalt mixture is 2.5%SBS+2.5%SBR>5%SBS>5%SBR.Compared with 5%SBS and 5%SBR modified emulsified asphalt mixture,the wear resistance of 2.5%SBS+2.5%SBR composite modified emulsified asphalt mixture is not improved,but the water damage resistance is significantly improved.The engineering application shows that after the overlay of 2.5%SBS+2.5%SBR micro surface is paved on the old road,the structural depth,friction coefficient and anti sliding value are large,and the pavement impermeability is excellent.
作者
樊秀生
FAN Xiusheng(Taiyuan Branch of Shanxi Provincial Highway Bureau,Shanxi Taiyuan 030032 China)