偏高岭土混凝土碳化及其力学性能  

Carbonation and mechanical property of metakaolin concrete

作　　者：赵燕茹[1,3] 张丽媛 王磊 喻泊厅 ZHAO Yanru;ZHANG Liyuan;WANG Lei;YU Boting(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;College of Science,Inner Mongolia University of Technology,Hohhot 010051,China;Inner Mongolia Key Laboratory of Civil Engineering Structure and Mechanics,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学土木工程学院,内蒙古呼和浩特010051 [2]内蒙古工业大学理学院,内蒙古呼和浩特010051 [3]内蒙古自治区土木工程结构与力学重点实验室,内蒙古呼和浩特010051

出　　处：《混凝土》2023年第4期51-54,68,共5页Concrete

基　　金：国家自然科学基金(11762015,11362013)。

摘　　要：将偏高岭土以同等质量替代水泥(0、5%、10%、15%)掺入混凝土中,对偏高岭土混凝土进行了不同龄期(0、7、28 d)的碳化试验以及碳化后的抗压和抗折强度试验。研究了不同偏高岭土掺量下混凝土的碳化性能,探讨了混凝土抗压强度、抗折强度、脆性系数随碳化龄期和偏高岭土掺量的变化规律,预测了偏高岭土混凝土碳化深度、抗压和抗折强度的模型。结果显示:偏高岭土可有效提高混凝土的抗碳化性能。随偏高岭土掺量的增多,试件抗压强度、抗折强度及脆性系数均逐渐增大,随碳化龄期的不断增长抗压强度和脆性系数先增大后逐渐减小,抗折强度逐渐降低。Metakaolin was added into concrete replacing cement bymass(0,5%,10%,15%),and the carbonation trial of metakaolin concrete with different carbonation ages(0,7,28 d)and the compressive and flexural strength trials after carbonation were carried out.The carbonation properties of concrete under different metakaolin contents were studied,the variation of compressive strength,flexural strength and brittleness coefficient of metakaolin concrete with carbonation ages and metakaolin contents were analyzed.Moreover,the models of the carbonation depth,compressive and flexural strength of metakaolin concrete were predicted.The experimental results show that metakaolin can effectively improve the carbonation resistance of concrete.With the grow of the metakaolin contents,the compressive strength,flexural strength and brittleness coefficient increase gradually,with the grow of carbonization ages,the compressive strength and brittleness coefficient firstly climb up and then decline,and the flexural strength gradually decline.

关 键 词：混凝土 偏高岭土 碳化 力学性能 脆性系数 预测模型 

分 类 号：TU528.01[建筑科学—建筑技术科学]