冻融环境下碳纤维聚合物加固混凝土施工技术研究  

Research on construction technique of carbon fiber reinforced polymer concrete under freezing and thawing environment

作　　者：肖亮洲 Xiao Liangzhou(Guangdong Baohui Construction Engineering Co.,Ltd.,Shantou Guangdong 515071,China)

机构地区：[1]广东保辉建筑工程有限公司,广东汕头515071

出　　处：《山西建筑》2023年第22期128-131,共4页Shanxi Architecture

摘　　要：为进一步提高混凝土短柱在冻融环境下的力学性能,使用碳纤维增强聚合物和收缩补偿混凝土加固混凝土受压构件,以研究加固混凝土短柱施工技术。由碳纤维增强聚合物(CFRP)和补偿收缩自密实混凝土(ESCC)组成的加固体系对CFRP外壳施加后张应力,进一步消除应力滞后,并发挥约束作用。实验变量包括冻融循环次数、加固聚合物壳层和加固混凝土类型。试验结果表明,当冻融循环次数达到125次时,混凝土受压构件的动态弹性模量损失率达到24.8%,质量损失率为5.3%。采用收缩补偿自密实混凝土对CFRP施加后张拉应力的方法,可以显著提高混凝土受压构件的承载力,比普通混凝土的承载力分别提高了13.23%和4.22%。且当冻融循环次数增加到75次时,混凝土试件的承载力比对照组降低了5.13%。随着冻融循环次数的不断增加,混凝土试件的损坏程度也逐渐增加,与对照组相比,承载力下降了28.2%。In order to improve the dynamic performance of the concrete short columns in the freezing and thawing environment,the paper adopts the carbon fiber polymer and shrinkage complementary concrete to reinforce the concrete compression members for the study on the construction technique of the reinforced concrete short columns,indicates the reinforced system consisting of the Carbon Fiber Reinforced Polymer(CFRP)and complementary shrinkage self-compacting concrete can apply post-tension stress on CFRP’s outer shell,which can further eliminate lagged strain and exert its restraint effect,illustrates the experimental variables include the freezing and thawing cycle index,layers of the reinforced polymers and types of the reinforced concrete.It is proved by the experiment results that the dynamic elastic modulus loss rate of the compression members reaches 24.8%and the quality loss rate 5.3%when the freezing and thawing cycle index is 125;the method of adopting shrinkage complementary self-compacting concrete to exert the post-tension stress on CFRP can evidently improve the loading capacity of the concrete compression members by 13.23%and 4.22%respectively under the comparison with the one of the common concrete;the loading capacity of the concrete sample drops by 5.13%,compared with the comparison group,when the freezing and thawing cycle index increased to 75;and the damaged condition of the concrete samples are tougher along with the constant rise in the freezing and thawing cycle index,in which the loading capacity drops by 28.2%under the comparison with the comparison group.

关 键 词：冻融循环 碳纤维聚合物 混凝土短柱 加固 

分 类 号：TU528.572[建筑科学—建筑技术科学]