橡胶沥青混合料密实度影响因素试验分析

Analysis of the density of asphalt rubber stress testing

通过马歇尔击实试验对橡胶沥青混合料的胶粉参量、集料特性、击实方法等方面展开研究,分析其最大蜡封干密度、油石比和空隙率,得出影响橡胶沥青混合料密实度的因素及变化规律。试验结果表明:胶粉掺量对混合料密实度影响很小;对于龙嫩公路用混合料级配,通过优化级配来提高密实度的提升空间不大;集料吸水率对空隙率影响明显,吸水率增加1%时,混合料空隙率增大约2%;相同的马歇尔试件100次击实比75次击实空隙率减小了31%,改变击实方法空隙率仅改变了1.6%。

Marshall compaction test were carried out for crumb rubber asphalt mixture parameters,aspects,aggregate properties,compaction methods. The wax seal maximum dry density,porosity and aggregate ratio were analyzed,derived affect rubber asphalt variation factors and compactness. The results show that the powder content on the density of the mixture is very small;For mixture gradation using for Long- nen highway,improvement room for the density by optimizing is not graded;Aggregate water absorption effects obviously on the porosity. When water rate increases by 1%,the mix porosity increases by about 2%;the same Marshall specimen with 100 times compaction times reduces the porosity of 31% than 75 times compaction;the porosity changes only by 1. 6% through changing the method of compaction.