寒区防渗层SBS改性沥青混凝土抗弯性能及三轴静动力特性研究
Research on Bending Properties and Triaxial Static and Dynamic Characteristics of SBS Modified Asphalt Concrete of Impervious Layer in Cold Regions
宁逢伟 1毛春华 1隋伟 1肖阳 1褚文龙1
作者信息
- 1. 中水东北勘测设计研究有限责任公司,吉林省长春市 130061;水利部寒区工程技术研究中心,吉林省长春市 130061
- 折叠
摘要
为提升寒区抽水蓄能电站面板防渗层服役能力,以低冻断温度为调控指标,制备了一种SBS改性沥青混凝土,考察了-1℃条件下该沥青混凝土弯拉应变、弯曲蠕变、弯曲疲劳、静三轴和动三轴性能,并与常规水工 90 号沥青混凝土对比.结果表明,SBS改性沥青混凝土冻断温度-46.3℃,比水工90号沥青混凝土降低10.1℃;弯曲应变、拉伸应变、弯曲蠕变、弯曲疲劳性能均不同程度提高;-1℃水工 90 号沥青混凝土静三轴和动三轴试验参数,如黏聚力、模量数、动应力、动弹性模量等显著增加,SBS改性沥青混凝土弹性模量、模量数、黏聚力等刚度指标相对较小,与常温条件水工 90 号沥青混凝土相当,低温柔性明显较好,能够弥补寒区环境对防渗层普通沥青混凝土造成的不利影响.
Abstract
In order to improve the service ability of the impervious layer of asphalt concrete panel of pumped storage power stations in cold regions,low freeze-break temperature was considered as a control indicator.A SBS modified asphalt concrete was prepared,whose bending tensile strain,bending creep,bending fatigue,static triaxial properties and dynamic triaxial properties were tested at the temperature of-1℃.The same measurements were executed for a conventional hydraulic 90#asphalt concrete.The advantages and disadvantages were discussed between the two asphalt concretes.The results indicated that,The freeze-break temperature of SBS modified asphalt concrete was-46.3℃,which was 10.1℃lower than that of hydraulic 90#asphalt concrete.The performance of bending strain,tensile strain,bending creep,and bending fatigue were all improved to different degrees.The static and dynamic triaxial test parameters of hydraulic 90#asphalt concrete at the temperature of-1℃,such as cohesion,modulus,dynamic stress,and dynamic elastic modulus,significantly increased.The stiffness indicators such as elastic modulus,modulus coefficient,and cohesion of SBS modified asphalt concrete at the temperature of-1℃were relatively smaller,which were equivalent to the hydraulic 90#asphalt concrete under normal temperature conditions.SBS modified asphalt concrete had significantly better flexibility at low temperature and could compensate for the adverse effects of cold environment on ordinary asphalt concrete for the impervious layer.
关键词
沥青混凝土/防渗层/弯曲蠕变/弯曲疲劳/三轴试验Key words
asphalt concrete/impervious layer/bending creep/bending fatigue/triaxial test引用本文复制引用
出版年
2024
NETL
NSTL
万方数据