Shear performance between asphalt wearing layer and UHPC for ultra-high performance lightweight composite deck
Li Jia1,2 Zhang Jian1,3 Dong Liang1 Xia Yangjialing1,4
1. School of Civil Engineering, Hunan University, Changsha 410082, China; 2. Key Laboratory for Wind and Bridge Engineering of Hunan Province,
Hunan University, Changsha 410082, China；3. China Construction Fifth Engineering Division Co., Ltd., Changsha 410004, China; 4. Guangdong
Province Communications Planning &Design Institute Co., Ltd., Guangzhou 510507, China
Abstract：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 loadinterface 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 0.7kg/m2for 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 number of cycles. After remediating the wearing layer, the interlaminar aging resistance may be reduced to some extent.
