碳纤维混凝土在恶劣环境中的变形破坏特性  

Deformation and failure characteristics of carbon fiber reinforced concrete in harsh environment

作　　者：许明远 何新 XU Mingyuan;HE Xin(Department of Civil Engineering,Henan Vocational College of Industry and Information Technology,Jiaozuo 454000,China;China Railway Major Bridge Reconnaissance and Design Institute Co.,Ltd.,Wuhan 430050,China)

机构地区：[1]河南工业和信息化职业学院土木工程系,河南焦作454000 [2]中铁大桥勘测设计院集团有限公司,湖北武汉430050

出　　处：《混凝土》2024年第9期61-66,共6页Concrete

基　　金：国家自然科学基金(52078468)。

摘　　要：为了研究碳纤维混凝土在恶劣环境中(硫酸盐侵蚀环境下)的变形破坏特性,制备了含碳纤维(质量为水泥质量的1.0%)的混凝土试件,开展了变幅循环受压试验。结果表明:随着干湿循环周期的增加,试件并不会立刻呈现明显的劣化的趋势,在干湿循环60次之前抵抗循环受压能力有所增加,之后开始下降,而在达到150次干湿循环后基本丧失抵抗变形破坏的能力;试件在循环荷载作用下的破坏是压密损伤和能量耗散逐渐积累的过程,而干湿循环周期的增加会逐渐增加耗散能转化率,最终改变了试件的储能机制。建立了基于累积残余应变且考虑初始损伤的损伤模型,该模型能够反映碳纤维混凝土在硫酸盐侵蚀环境下的损伤演化规律,具有一定的参考价值。In order to study the deformation and failure characteristics of carbon fiber concrete in harsh environment(sulfate erosion environment),concrete specimens containing carbon fiber(1.0%of cement mass)were prepared,and variable amplitude cyclic compression tests were carried out.The results show that with the increase of dry-wet cycle,the specimen does not immediately show a clear trend of deterioration.The ability to resist cyclic compression increases before 60 times of dry-wet cycle,and then begins to decrease.After 150 times of dry-wet cycle,the ability to resist deformation and failure is basically lost.The failure of the specimen under cyclic loading is a process of gradual accumulation of compaction damage and energy dissipation,and the increase of dry-wet cycle period will gradually increase the conversion rate of dissipated energy,and finally change the energy storage mechanism of the specimen.A damage model based on cumulative residual strain and considering initial damage is established.The model can reflect the damage evolution law of carbon fiber concrete under sulfate attack environment,and has certain reference value.

关 键 词：碳纤维 混凝土 硫酸盐侵蚀 变形破坏 循环受压 

分 类 号：TU528.572[建筑科学—建筑技术科学]