Experimental Study on Fracture Properties of Wet Joint with UHPC Functional Gradient Under Acid Rain Corrosion
GUO Liujun1, WANG Kai2,*, WANG Jinyu2, HU Shimei2, YU Guoqing2
1 School of Civil Engineering, Central South University, Changsha 410075, China 2 School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China
Abstract: Given the structural stress distribution and material manufacturing cost of the wet joint of a prefabricated bridge deck in an acid rain region, a wet joint of the prefabricated bridge deck with an ultra-high performance concrete (UHPC) functional gradient was designed by introducing the design concept of a functional gradient composite structure. Twenty groups of wet joint specimens were studied by the three-point bending fracture test. The effects of different thickness ratios of UHPC and acid rain corrosion time on the initial cracking load, peak load, elastic modulus, fracture toughness, and fracture energy of wet joint specimens were discussed. The results show that the initial cracking load and peak load increase at the initial stage of corrosion, and the initial cracking load will accelerate the deterioration with the degree of corrosion increasing. The elastic modulus, fracture toughness, and fracture energy of wet joint specimens first increased and then decreased with the increase of corrosion time. The use of UHPC material can effectively improve the fracture performance of wet joint specimens and delay their deterioration in acid rain environments. The fracture performance of the wet joint specimen increases the most when the thickness ratio of UHPC is 1/3, indicating that the utilization efficiency of UHPC is the highest.
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2023, Vol. 37 
