刚增军



文章编号:1000033X(2016)12005604
收稿日期:20160617
基金项目:国家自然科学基金青年科学基金项目(51011120574)
摘要:通过对温拌橡胶沥青进行Brookfield旋转粘度试验、动态剪切流变试验和弯曲梁流变试验,观察掺入Sasobit温拌剂后橡胶沥青的高温和低温性能变化,并寻找适宜的温拌剂掺量,以实现温拌剂与橡胶沥青结合性能的最优化。试验结果表明:温拌剂能够降低橡胶沥青的粘度,降低摊铺和压实的温度和施工难度;温拌剂掺量在2.5%~3%时,能够提高高温抗永久变形能力,并降低对低温性能的损害。
关键词:温拌橡胶沥青;Sasobit温拌剂;高温性能;低温性能
中图分类号:U416.21文献标志码:B
Research on Rheology and Creep Properties of Asphalt Rubber with Sasobit
GANG Zengjun
(Shaanxi Provincial Communications Construction Group, Xian 710075, Shaanxi, China)
Abstract: In order to verify the properties of asphalt rubber with different content of Sasobit, the performance of warm mix asphalt rubber at high temperature and low temperature was analyzed. The pavement performance of asphalt rubber were observed by means of Brookfield rotational viscosity test, dynamic shear rheological test (DSR) and bending beam rheological test (BBR). In order to achieve the optimization of binding performance, appropriate amount of warm mix was confirmed. The results show that the viscosity is lower when Sasobit is applied, and the temperatures for paving and compaction are also lower. When the content of Sasobit is between 2.5% and 3%, the resistance to permanent deformation can be greatly improved, and damage to the performance of asphalt rubber is alleviated.
Key words: warm mix asphalt rubber; Sasobit; hightemperature performance; lowtemperature performance
0引言
温拌技术被称为“中国第二次筑路革命”。2009年,北京长安街应用温拌环保技术修复,降雾减烟、节能减排效果明显。此后在石家庄、南京等地,先后对温拌橡胶沥青的环保及路用性能做了大量研究。通过对比热拌(HWA,拌和温度为150 ℃~180 ℃)、温拌(WMA,拌和温度为110 ℃~120 ℃)沥青的路用性能发现:温拌沥青虽然能够减少能量损耗,降低化学和物理污染,并降低拌和、摊铺及压实过程的温度和粘度等[1];但由于采用间断级配,摊铺过程中容易发现离析,且温拌技术的成本较热拌沥青偏高,因此难以全面推广[2]。
橡胶沥青通过在基质沥青中加入废旧橡胶轮胎胶粉和相容性的添加剂,实现了资源循环,降低了黑色污染,提高了沥青高低温稳定性、耐久性及抗水损害的能力;但是在拌和及摊铺过程中,由于温度过高,橡胶沥青会释放大量的一氧化碳、丁二烯、苯等有毒气体,高粘度也使橡胶沥青混合料不易摊铺和压实[3]。……