摘要
针对山区桥墩存在多次冲磨及伴生的腐蚀问题特点,开展氯盐腐蚀和多次冲磨耦合作用下超高性能混凝土(UHPC)和普通混凝土性能试验研究。首先,利用氯盐溶液对UHPC和普通混凝土进行腐蚀,探讨氯盐腐蚀下UHPC和普通混凝土的力学性能;然后,通过水下钢球法研究UHPC和普通混凝土的抗冲磨性能,对比UHPC在单次冲磨和多次“腐蚀-冲磨”作用下的抗冲磨性能,揭示不同冲磨频率下UHPC的抗冲磨性能变化规律;最后,建立不同冲磨频率下UHPC质量保有量和冲磨时间以及冲磨频率的关系函数,进而对试验数据进行验证。结果表明:经过单次冲磨作用后,氯盐腐蚀28 d的UHPC抗冲磨强度是未经氯盐腐蚀普通混凝土抗冲磨强度的5.97倍;UHPC经过4次“腐蚀-冲磨”循环作用的抗冲磨强度仍为未经氯盐腐蚀普通混凝土抗冲磨强度的2.94倍,说明了UHPC相比普通混凝土具有优异的抗冲磨性能;在相同氯盐腐蚀条件下,相比单次冲磨作用,多次“腐蚀-冲磨”作用会导致UHPC质量损失增加506.62%,说明了基于单次冲磨试验所得到的性能评估可能会导致高估材料的抗冲磨性能,使设计偏于不安全。提出的多次“腐蚀-冲磨”试验与分析方法将推动更为合理地评估桥墩等构件抗冲磨性能,克服传统单次冲磨试验可能导致材料抗冲磨性能被高估的不足。
To explore the characteristics of multiple abrasion and accompanying corrosion issues in existingbridge piers in mountainous areas,the performance tests were conducted on ultra-high performance concrete(UHPC)and ordinary concrete under the combined effects of chloride salt corrosion and multiple abrasion.Firstly,UHPC and normal concrete were corroded by chlorine salt solution,and the mechanical properties ofUHPC and normal concrete under chlorine salt corrosion were investigated.Then,the anti-abrasionperformances of UHPC and normal concrete were investigated by underwater steel ball method,the anti-abrasion performances of UHPC under single abrasion and multiple corrosion-abrasion cycles were compared,and the variation patterns of UHPC's anti-abrasion performances under different abrasion frequencies wererevealed.Finally,the function related to the massretention of UHPC,abrasion time,and abrasion frequency under the different abrasion frequencies wasestablished,and the experimental data were verified.The results show that for single abrasion,the anti-abrasion strength of UHPC after chloride saltcorrosion for 28 days is 5.97 times greater than that of ordinary concrete without chloride salt corrosion,theanti-abrasion strength of UHPC after four cycles of corrosion-abrasion remains 2.94 times higher than that ofordinary concrete without chloride salt corrosion,demonstrating that UHPC has excellent anti-abrasionperformance compared to ordinary concrete.Under the same chloride salt corrosion conditions,it is found thatmultiple corrosion-abrasion cycles lead to a 506.62%increase in the mass loss of UHPC compared to singleabrasion,indicating that performance assessments based on single abrasion tests may overestimate the anti-abrasion performances of the material,and make the designs unsafe.The multiple corrosion-abrasion test and analysismethods proposed in this paper are expected to promote more reasonable evaluations of the anti-abrasionperformances of structural components such as bridge piers,overcoming the shortcomings of traditional singleabrasion tests that may lead to overestimation of material anti-abrasion performances.5 tabs,10 figs,30 refs.
作者
樊伟
孙纯杰
马凌飞
朱张豪
FAN Wei;SUN Chun-jie;MA Ling-fei;ZHU Zhang-hao(School of Civil Engineering,Hunan University,Changsha 410082,Hunan,China;Key Laboratory for Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,Hunan,China;State Key Laboratory of Bridge Engineering Safety and Resilience,Hunan University,Changsha 410082,Hunan,China)
出处
《长安大学学报(自然科学版)》
北大核心
2025年第1期50-59,共10页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(51978258)
湖南省重点研发计划项目(2021SK2052)
广西自然科学基金项目(2021GXNSFBA075034)。
关键词
桥梁工程
超高性能混凝土
试验研究
多次冲磨
抗冲磨性能
氯盐腐蚀
bridge engineering
ultra-high performance concrete
experimental reasearch
multiple abrasion
anti-abrasion performance
chloride salt corrosion
