摘要
由于昼夜温度交替变化,盐渍土地区的沥青混凝土路面易发生冻融破坏,影响沥青路面的使用性能.采用冻融劈裂试验,以冻融劈裂抗拉强度和冻融腐蚀因子评价沥青混凝土在氯盐侵蚀下强度的变化规律.结果表明:经过氯盐侵蚀冻融循环后,沥青混凝土的冻融劈裂抗拉强度明显下降;而且随着冻融次数的增加,其冻融劈裂抗拉强度下降的幅度增大.冻融腐蚀因子也呈现同样的变化规律,氯盐浓度越高,对沥青混凝土冻融劈裂抗拉强度和冻融腐蚀因子影响也越大.试验研究结果为盐分地区沥青路面结构设计提供科学依据.
Freezing-thawing damage to asphalt con- crete pavement in saline soil areas is more frequent due to diurnal temperature variation, which affect pavement performance directly. So splitting tensile test for asphalt concrete in freezing-thawing condi- tion is conducted. The splitting tensile strength and freezing-thawing corrosion factor are adopted to evaluate the strength variation of asphalt con- crete under chlorine salt action. The results show that the splitting tensile strength of asphalt con- crete decreases rapidly after chlorine salt erosionwith several freeze-thaw cycles, and the decreasing amplitude increases with the times of freezing-tha- wing cycles. Freezing-thawing corrosion factor shows the same changing tendency. Moreover, the higher the concentration of chlorine salt, the larger the influence on the splitting tensile strength and freezing-thawing corrosion factor for asphalt con- crete. The results would provide the scientific foundation for structural design of asphalt concrete in salt areas
出处
《冰川冻土》
CSCD
北大核心
2013年第5期1202-1208,共7页
Journal of Glaciology and Geocryology
基金
安徽省高校省级自然科学研究项目(KJ2013A082)资助
关键词
沥青混凝土
冻融劈裂
氯盐
腐蚀因子
asphalt concrete freezing-thawing splitting chlorine salt erosion factor
