石灰石粉掺量对混凝土性能的影响及作用机理研究  

Study of influences on concrete performance and mechanism added with limestone flour

作　　者：刘金平 李信 陈露一 谭洪波[3] LIU Jinping;LI Xin;CHEN Luyi;TAN Hongbo(State Key Laboratory of Bridge Structural Health and Safety,Wuhan 430034,China;China Railway Britech Co.,Ltd.,Wuhan 430034,China;Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]桥梁结构健康与安全国家重点实验室,湖北武汉430034 [2]中铁桥研科技有限公司,湖北武汉430034 [3]武汉理工大学,湖北武汉430070

出　　处：《混凝土》2023年第8期92-94,共3页Concrete

基　　金：国家自然科学基金(51772227)。

摘　　要：研究了石灰石粉掺量的变化对混凝土工作性能、力学性能、抗氯离子渗透性能及干燥收缩性能的影响,并分析了石灰石粉在混凝土中的作用机理。经相关试验检测,结果表明:石灰石粉在适宜掺量范围内能使混凝土的工作性能得到改善;混凝土中掺入10%以内的石灰石粉,强度和抗氯离子渗透性能并未降低,超过此掺量,混凝土强度和抗氯离子渗透性能变差;石灰石粉会导致混凝土干缩率变大,且石灰石掺量与混凝土干缩率呈正比例关系。在混凝土中,石灰石粉的掺量不宜超过10%。The effects of different amounts of limestone flour on concrete work performance,mechanical properties,anti-chlorine ion permeability and shrinkage were studied.The mechanism of limestone flour in concrete was analyzed.The results show that the adding of limestone flour into concrete can improve the working performance of concrete,and in a certain amount range,the effect is more pronounced with the increase of addition of the limestone flour.There is no adverse effect on concrete strength and anti-chlorine ion permeability with a proportion of less than 10%limestone flour.When it′s more than 10%,the strength and chloride ion permeability of concrete will deteriorate.Limestone flour can increase the concrete dry shrinkage and the concrete shrinkage increases as the limestone flour increases.The amount of limestone flour in concrete should not exceed 10%.

关 键 词：石灰石粉 工作性能 抗氯离子扩散系数 干缩率 

分 类 号：TU528.041[建筑科学—建筑技术科学]