复合石灰石粉混凝土耐久性能试验研究  

Experimental study on durability performance of composite limestone powder concrete

作　　者：武业忱 吕恒林 章明明[1] 李杭 戚传康 WU Yechen;LÜHenglin;ZHANG Mingming;LI Hang;QI Chuankang(School of Mechanics and Civil Engineering;b.Key Laboratory of Engineering Environmental Impact and Structural Safety,Jiangsu Province,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)

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

出　　处：《混凝土》2024年第6期93-98,104,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：为探究不同水胶比及石灰石粉等矿物掺合料对复合石灰石粉混凝土耐久性能的影响,对普通混凝土、石灰石粉-矿渣混凝土以及石灰石粉-矿渣-粉煤灰混凝土的抗碳化、抗冻融、抗氯离子侵蚀等耐久性能展开试验研究。结果表明:在矿物掺合料总掺量固定为50%情况下,(1)降低水胶比可以提高复合石灰石粉混凝土的抗碳化、抗冻融、抗氯离子侵蚀性能;(2)加入石灰石粉可以优化复合石灰石粉混凝土胶凝材料体系的颗粒级配,从而改善了抗冻融和抗氯离子侵蚀性能;(3)矿渣因火山灰效应引起二次水化,一方面降低了复合石灰石粉混凝土的碱性,弱化了抗碳化性能,另一方面水化胶凝产物提高了复合石灰石粉混凝土的密实性,改善了抗冻融和抗氯离子侵蚀性能;(4)粉煤灰等比例代替部分矿渣,对复合石灰石粉混凝土早期的抗碳化、抗冻融和抗氯离子侵蚀等耐久性能不利。In order to investigate the effects of different water-binder ratios and mineral admixtures such as limestone powder on the durability of composite limestone powder concrete,experimental studies were conducted on the durability performance of ordinary concrete,limestone powder-slag concrete and limestone powder-slag-fly ash concrete with respect to carbonation,freeze-thaw and chloride ion erosion.The results show that under the condition that the total amount of mineral admixture is fixed at 50%,(1)reduce the water-binder ratio can improve the composite limestone powder concrete resistance to carbonation,freeze-thaw,chloride ion erosion performance;(2)the addition of limestone powder can optimize the particle gradation of the composite limestone powder concrete cementitious material system,thus improving the resistance to freeze-thaw and chloride ion erosion;(3)slag caused by the volcanic ash effect of secondary hydration,on the one hand,reduces the alkalinity of composite limestone powder concrete,weakening the resistance to carbonation,on the other hand,the hydration gelation products improve the compactness of composite limestone powder concrete,improving the resistance to freeze-thaw and chloride ion erosion;(4)Fly ash in equal proportions instead of slag is detrimental to the durability of composite limestone powder concrete in terms of resistance to carbonation,freeze-thaw and chloride ion attack in the early stage.

关 键 词：水胶比 复合石灰石粉混凝土 碳化 冻融 氯离子侵蚀 

分 类 号：TU528.041[建筑科学—建筑技术科学]