摘要
为探究石灰石粉及矿渣对混凝土碳化性能以及可靠性的影响,以掺合料比例、水胶比、石粉比表面积以及龄期为参数进行快速碳化试验,得出了试验环境和自然环境下的碳化预测模型,由此展开自然碳化下的可靠性预测分析,并以分析得到的可靠度指标为因变量,选取混凝土的水胶比、保护层厚度、石粉的掺量以及龄期4个自变量设计正交试验,对4个因素的重要性进行判定。结果表明:掺加石粉或矿渣后混凝土抗碳化能力均有所降低,其中以单掺20%石粉的混凝土抗碳化能力下降最为明显。石灰石粉-矿渣混凝土抗碳化能力随着水胶比的减小、石灰石粉比表面积的增大而变强。掺加不同比例的矿物掺合料对碳化结构可靠性均有一定减弱影响,对碳化结构可靠性的影响程度为水胶比>碳化龄期>混凝土保护层厚度>石灰石粉掺量,其中水胶比大小、石灰石粉掺量大小、碳化龄期长短与可靠度指标大小负相关,保护层厚度大小与可靠度指标大小呈正相关。
To explore the influence of limestone powder and slag on the carbonation performance and reliability of concrete,the rapid carbonation test analysis is carried out with the proportion of admixture,water binder ratio,specific surface area of limestone powder and carbonation age as parameters,and the carbonation prediction model under the test environment and natural environment is obtained.Therefore,the carbonation reliability analysis is carried out.Taking the reliability index as the dependent variable,the orthogonal test was designed with four independent variables of the water binder ratio of concrete,the thickness of concrete protective layerthe,mixing amount of limestone powder and the carbonation age to judge the importance of the four factors.The results show that the carbonation resistance of concrete is reduced after adding limestone powder or slag,especially when adding 20%limestone powder alone.The carbonation resistance of limestone powder-slag concrete increases with the decrease of water binder ratio and the increase of specific surface area of limestone powder.The addition of mineral admixtures with different proportions has a certain weakening effect on the reliability of carbonated structure.The degree of influence on the reliability of carbonated structure is water binder ratio>carbonation age>thickness of concrete protective layer>limestone powder dosage.Among them,water binder ratio,limestone powder dosage,carbonation age are negatively correlated with the size of reliability index,and the thickness of protective layer is positively correlated with the size of reliability index.
作者
聂超柱
吕恒林
唐鹏
周淑春
刘克芳
NIE Chaozhu;LÜHenglin;TANG Peng;ZHOU Shuchun;LIU Kefang(School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China;Key Laboratory of Engineering Environmental Impact and Structural Safety in 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;Xuzhou Housing Expropriation and Real Estate Security Management Center,Xuzhou 221634,China;Xuzhou Construction Engineering Testing Center Company Limited,Xuzhou 221003,China)
出处
《混凝土》
CAS
北大核心
2024年第3期101-107,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)。
关键词
混凝土
水胶比
碳化模型
可靠度
失效率
concrete
water to cement ratio
carbonization model
reliability
failure rate
