石灰石粉细度对矿渣-石灰石粉混凝土力学性能的影响  

Influence of limestone powder fineness on mechanical performance of slag-limestone powder concrete

作　　者：景彦睿 周淑春[1,2] 陈娟 吕恒林 JING Yanrui;ZHOU Shuchun;CHEN Juan;LU Henglin(Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China;Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学江苏省工程环境影响与结构安全重点实验室 [2]中国矿业大学力学与土木工程学院 [3]江苏省建筑节能与建筑技术协同创新中心

出　　处：《混凝土》2023年第1期114-119,共6页Concrete

基　　金：国家重点研发计划课题“绿色宜居村镇建设评价体系关键技术研究”(2018YFD1100203);徐州市重点研发计划项目(社会发展)(KC16SS088)。

摘　　要：为探究石灰石粉细度对复掺混凝土物理力学性能的影响情况,以掺合料比例、石灰石粉比表面积、强度等级为变参,以矿渣30%、石灰石粉20%的比例按等同质量替代水泥的方法,设计制作了108个矿渣-石灰石粉复掺混凝土试件。结果表明,大掺量石粉的复掺混凝土,抑复其抗压、抗折以及劈裂抗拉强度的提高,但满足强度等级要求,具有良好的经济效益;石灰石粉细度的增加可小幅度增大复掺混凝土的强度;普通混凝土的应力-应变曲线不再适用于复掺混凝土;石灰石粉越细,混凝土的延性越好。In order to explore the influence of the fineness of limestone powder on the physical and mechanical properties of the concrete mixed with limestone powder,taking the proportion of admixture,specific surface area and strength grade of limestone powder as variable parameters,108 slag-limestone powder mixed concrete specimens were designed and manufactured by replacing cement with the same mass with the proportion of slag 30% and limestone powder 20%.The results show that the concrete mixed with large amount of stone powder can restrain the increase of its compressive strength,bending strength and splitting tensile strength,but meet the requirements of strength grade and have good economic benefits.The increase of the fineness of limestone powder can increase the strength of the mixed concrete slightly.The stress-strain curve of ordinary concrete is no longer applicable to the mixed concrete.The finer the limestone powder,the better the ductility of concrete.

关 键 词：矿渣-石灰石粉混凝土 复掺 细度 力学性能 

分 类 号：TU528.041[建筑科学—建筑技术科学]