摘要
西藏等高原地区沥青混合料的老化是沥青路面病害的主要原因之一。为研究高原地区沥青路面的老化规律,详细论述了高原地区沥青老化的机理,并通过室内紫外光加速老化照射计和室外自然光老化进行对比试验,验证了室外自然光对沥青的老化比室内试验更强烈。通过对几种沥青的室内、外老化对比试验,验证了沥青胶结料经老化后的指标如针入度、软化点、延度、PI值、劲度模量S及蠕变速率斜率m等的变化规律。通过对SBS、SBR两种常用改性沥青光老化试验后的PI值、劲度模量S、蠕变斜率m等指标的分析可知,SBR改性沥青更适用于西藏等高原地区。研究结果对西藏等高海拔地区评价和选择使用沥青结合料有一定参考价值。
The aging of the asphalt mixture in plateau areas such as Tibet is one of the main causes of asphalt pavement degradation. To study the aging law of asphalt pavement in the highland area,the mechanism of asphalt aging in the plateau area was discussed in detail,and the aging results from indoor ultraviolet light simulation and outdoor natural light were compared. Results showed that the outdoor natural light aging was more severe than the indoor counterpart. Through the comparison tests of indoor and outdoor aging of several kinds of asphalt,the indicators such as penetration,softening point,ductility,PI value,stiffness modulus S and creep rate slope m of asphalt binder were verified. Through the analysis of the PI value,the stiffness modulus S and the creep slope m of the two commonly used modified asphalts of SBS and SBR,the SBR modified asphalt is more suitable for the plateau areas such as Tibet. The research results have a certain reference value for the evaluation and selection of asphalt binders in high altitude areas such as Tibet.
作者
王祺
徐霈
孙瑞
WANG Qi,XU Pei,SUN Rui
出处
《公路交通技术》
2018年第4期26-30,共5页
Technology of Highway and Transport
基金
云南省交通厅科技计划项目(云交科2011(A)01-a)
海南省交通科技项目(JT20160898006)
关键词
高原地区
沥青路面
老化机理
老化试验
plateau area
asphalt pavement
aging mechanism
aging test
