面向抗碳化性能提升的再生混凝土机械增压养护  

Mechanical Pressurization Maintenance of Recycled Concrete for Improving Carbonation Resistance

作　　者：唐超 张露 林吉勇 刘荣 戴自全 TANG Chao;ZHANG Lu;LIN Jiyong;LIU Rong;DAI Ziquan(Chengdu Tiantou Industrial Co.,Ltd.,Chengdu 610218,Sichuan,China;Chengdu Construction Engineering Group Co.,Ltd.,Chengdu 610031,Sichuan,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Sichuan Kangli Project Management Co.,Ltd.,Chengdu 610000,Sichuan,China)

机构地区：[1]成都天投实业有限公司,四川成都610218 [2]成都建工集团有限公司,四川成都610031 [3]重庆交通大学土木工程学院,重庆400074 [4]康立时代建设集团有限公司,四川成都610000

出　　处：《建筑施工》2024年第2期147-149,共3页Building Construction

基　　金：国家自然科学基金项目(51878610);四川省区域创新合作项目(2022YFQ0048)。

摘　　要：针对再生混凝土的多孔特性有利于气体和水分传输,导致其相较于普通混凝土材料抗碳化性较差的问题,提出了混凝土养护期施加持续压力改善再生混凝土孔结构的工艺,分析了该工艺作用下再生混凝土抗碳化性能。结果表明,再生混凝土养护过程中持续施加压力并保载2d,相比没有施加机械力的试件,其含气量减少54.0%,0.1mm以上气孔减小40.2%,28d碳化深度减少47.7%。研究成果可为再生混凝土制备预制构件的抗碳化性能提升提供技术支持。Aiming at the problem that the porous characteristics of recycled concrete are beneficial to the transmission of gas and water,which leads to the poor carbonation resistance compared with ordinary concrete materials,a process of applying continuous pressure to improve the pore structure of recycled concrete during concrete curing period is proposed,and the carbonation resistance of recycled concrete under this process is analyzed in this article.The results show that the air content of the recycled concrete is reduced by 54.0%,the pores above 0.1 mm are reduced by 40.2%,and the 28 d carbonation depth is reduced by 47.7% compared with the specimens without mechanical force when the pressure is continuously applied and the load is kept for 2 days during the curing process of recycled concrete.These research outcomes offer valuable technical insights for enhancing the carbonation resistance of prefabricated components fabricated from recycled concrete.

关 键 词：再生混凝土 养护期 持续增压 抗碳化 孔结构 

分 类 号：TU528[建筑科学—建筑技术科学]