石灰石粉细度对混凝土基本力学性能及微观结构的影响  

Effect of fineness of limestone poweder on basic mechanical properties and microstructure analysis of concrete

作　　者：代慧慧 周淑春 胡雄师 吕恒林 王召[1] DAI Huihui;ZHOU Shuchun;HU Xiongshi;LÜHenglin;WANG Zhao(School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China;Key Laboratory of Engineering Environmental Impact and Structural Safety,China University of Mining and Technology,Xuzhou 221116,China;Jiangsu Collaborative Innovation Center of Building Energy-Saving and Construction Technology,Jiangsu Vocational Institute of Architectural Technology,Xuzhou 221116,China;Xuzhou Housing Expropriation and Real Estate Security Management Center,Xuzhou 221634,China)

机构地区：[1]中国矿业大学力学与土木工程学院,江苏徐州221116 [2]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,江苏徐州221116 [3]江苏建筑职业技术学院江苏建筑节能与建筑技术协同创新中心,江苏徐州221116 [4]徐州市房屋征收和房产保障管理中心,江苏徐州221634

出　　处：《混凝土》2024年第5期98-103,116,共7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);江苏建筑节能与建造技术协同创新中心2021年重大研究基金计划项目“双碳背景下工业固废混凝土材料和结构性能提升关键技术和应用”(SJXTZD2102);江苏建筑节能与建造技术协同创新中心2021年青年博士基金计划项目“寒冷地区复合石灰石粉-尾矿混合砂混凝土基本力学性能与耐久性能研究”(SJXTBS2128);中国矿业大学研究生创新计划项目“寒冷地区复合石灰石粉-尾矿混合砂混凝土基本性能研究”(2022WLKXJ054)。

摘　　要：主要研究固定胶凝材料掺量的情况下,石灰石粉细度对石灰石粉-粉煤灰-矿渣混凝土的基本力学性能的影响,并通过扫描电子显微镜(SEM)、X射线衍射(XRD)进行微观结构分析。研究表明:石灰石粉掺量为20%时,主要为稀释效应,强度降低较多;混凝土抗压强度和劈裂抗拉强度随石灰石粉比表面积的增大而提高,石灰石粉细度对抗折强度无显著影响;石灰石粉细度增大,填充效果更好,混凝土内部结构更加密实。The effect of limestone fineness on the basic mechanical properties of limestone powder-fly ash-slag concrete was mainly studied under the condition of fixed cementitious material doping,and microstructural analysis was carried out by scanning electron microscopy(SEM)and X-ray diffraction(XRD).Studies have shown that when the amount of limestone powder is 20%,it is mainly dilution effect,and the strength is reduced more.The compressive strength and split tensile strength of concrete increase with the increase of the specific surface area of limestone powder,and the fineness of limestone powder has no significant impact on the flexural strength.The fineness of limestone powder increases,the flling effect is better,and the internal structure of the concrete is more solid.

关 键 词：石灰石粉细度 混凝土 基本力学性能 微观结构 

分 类 号：TU528.041[建筑科学—建筑技术科学]