摘要
为研究沥青磨耗层-UHPC层间抗剪性能,基于剪切破坏能量分析原理,提出剪切断裂能计算方法;针对新、旧两种界面状况,开展沥青磨耗层-UHPC层间斜剪试验,得到荷载-界面位移全过程曲线;通过模拟不利环境复合试件老化过程,研究新、旧界面抗剪性能劣化规律;探究重铺磨耗层黏结剂用量对于修复效果的影响。研究表明:剪切断裂能综合反映层间剪切强度和剪切推移量的大小,能够更加全面地表征层间抗剪特性;荷载-界面位移全过程曲线呈现出四个阶段;在水损害、高温湿热、氯盐侵蚀等不利自然环境下,复合试件层间抗剪性能劣化规律具有相似性,但老化程度存在差异,环境影响排序为:水损坏>氯盐高湿>湿热环境;修复过程中黏结剂的用量对于修复效果影响显著,建议采用0.7kg/m^(2)的黏结剂用量;旧界面试件的剪切强度、剪切断裂能均小于新界面试件,两者差值随着循环次数增加而逐渐增大,修复后层间耐老化性能有所降低。
Based on the shear failure energy principle,the calculation method of shear fracture energy was proposed in order to evaluate the interlaminar shear performance between the asphalt wearing layer and UHPC.For both the new and old interfaces between the asphalt mixture and UHPC,the interlaminar shear tests were carried out and the whole process curve of load-interface displacement was obtained.After simulating the aging process of composite specimens in unfavorable environments,the interlaminar deterioration of shear performance was investigated.The influences of the amount of adhesive on the remediated interface were analyzed when resurfacing the asphalt wearing layer.The researches show that the shear fracture energy may reflect comprehensively both the interlaminar shear strength and the shear displacement,and further represent the overall interlaminar shear characteristics.The full process curve of load-interface displacement consists of the four stages.Under unfavorable environments such as water damage,high temperature&humidity and chloride salt erosion,the interlaminar shear performance are identical in the deteriorating patterns,but they are different in the degrees of aging.Environmental impact ranking is:Water damage>Chloride salt and high humidity>High temperature&humidity.The amount of adhesive used may significantly affect the service life for the rehabilitation project,and the amount of 0.7 kg/m^(2) for the adhesive shall be recommended.When comparing the two composite specimens for old and new interfaces respectively,it is found that the former possesses smaller shear strength and shear fracture energy,and the difference in the shear performance of the two specimens may increase with the numberof cycles.After remediating the wearing layer,the interlaminar aging resistance may be reduced to some extent.
作者
李嘉
张坚
董亮
夏杨嘉玲
Li Jia;Zhang Jian;Dong Liang;Xia Yangjialing(School of Civil Engineering,Hunan University,Changsha 410082,China;Key Laboratory for Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China;China Construction Fifth Engineering Division Co.,Ltd.,Changsha 410004,China;Guangdong Province Communications Planning&Design Institute Co.,Ltd.,Guangzhou 510507,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2021年第7期73-80,113,共9页
China Civil Engineering Journal
基金
国家自然科学基金(51678229)。
关键词
桥梁工程
组合桥面
抗剪性能
桥面修复
能量分析
超高性能混凝土
沥青磨耗层
bridge engineering
composite deck
shear performance
bridge deck repair
energy analysis
ultra high performance concrete
asphalt wearing layer
