摘要
考虑酸雨地区预制桥面板湿接缝服役期间的结构应力分布和材料制作成本,引入功能梯度组合结构设计理念,设计一种超高性能混凝土(UHPC)功能梯度预制桥面板湿接缝。通过酸雨环境模拟加速腐蚀试验和三点弯曲断裂试验对20组湿接缝试件进行研究。探讨不同的UHPC厚度比(UHPC的浇筑厚度与试件的总厚度之比)和酸雨腐蚀龄期对湿接缝试件的起裂荷载、失稳荷载、弹性模量、断裂韧度和断裂能的影响。结果表明,试件的起裂荷载和峰值荷载在腐蚀初期均有所增加,随着腐蚀程度增加,起裂荷载则会加速降低;湿接缝试件的弹性模量、断裂韧度和断裂能随酸雨腐蚀时间的延长呈先增大后减小的变化趋势;UHPC的使用能有效改善湿接缝试件的断裂性能,延缓其在酸雨腐蚀环境下的劣化;当UHPC厚度比为1/3时其利用效率最高,湿接缝试件的断裂性能增速最大。
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.
作者
郭柳君
王凯
王锦瑜
胡仕梅
余国庆
GUO Liujun;WANG Kai;WANG Jinyu;HU Shimei;YU Guoqing(School of Civil Engineering,Central South University,Changsha 410075,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)
出处
《材料导报》
CSCD
北大核心
2023年第19期103-109,共7页
Materials Reports
基金
国家自然科学基金(51478183)
江西省重点研发计划项目(20192BBG70079)。
关键词
超高性能混凝土
三点弯曲
酸雨腐蚀
功能梯度
湿接缝
断裂性能
ultra-high performance concrete
three-point bending
acid rain corrosion
functional gradient
wet joint
fracture property
