粉胶比对橡胶沥青胶浆高温性能的影响研究

Study of the influence about the high temperature performance of crumb rubber modified asphalt mortars by powder/asphalt ratio

为了研究不同粉胶比对橡胶沥青胶浆高温性能的影响,选择石灰岩矿粉作为填料,粉胶比掺量为0.2、0.4、0.6、0.8。胶浆高温性能的评价指标选择Fail temperature和ZSV,通过DSR试验对不同胶浆进行研究。试验结果表明:随着粉胶比的增加,橡胶沥青胶浆的Fail temperature和ZSV值均逐渐变大,而且增大幅度较大,橡胶沥青胶浆的高温性能得到明显的改善;利用环境扫描电镜对胶浆进行扫描,发现添加矿粉的橡胶沥青胶浆光滑、细腻,矿粉被橡胶沥青裹覆均匀。

In order to study different powder / asphalt ratios effect on high temperature performances of mortar,this paper chooses limestone as the filler,and powder / asphalt ratio is 0. 2,0. 4,0. 6,0. 8.Mortar high temperature performance evaluation index selects Fail temperature and ZSV through DSR test. The test results show that with the increase of powder / asphalt ratio,Fail temperature and ZSV value of the mortar increase gradually,and the amplitude is larger. High temperature performance of the mortars improves obviously. By using environmental scanning electron microscopy search for those mortars,the results show that crumb rubber modified asphalt mortar of powder is smooth and delicate,the powder is covered uniformity by crumb rubber.