复合石灰石粉-粉煤灰-矿渣混凝土抗冻融性能研究  

Freeze-Thaw Resistance of Composite Limestone Powder-Fly Ash-Slag Concrete

作　　者：武业忱 吕恒林 章明明[1] 闫启耀 闫慧 戚传康 WU Yechen;LYU Henglin;ZHANG Mingming;YAN Qiyao;YAN Hui;QI Chuankang(School of Mechanics and Civil Engineering,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;Key Laboratory of Engineering Environmental Impact and Structural Safety,Jiangsu Province,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学力学与土木工程学院,徐州221116 [2]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,徐州221116 [3]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,徐州221116

出　　处：《硅酸盐通报》2023年第8期2808-2820,共13页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划课题(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(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(SJXTBS2128);中国矿业大学研究生创新计划项目(2022WLKXJ054)。

摘　　要：为探究复合石灰石粉-粉煤灰-矿渣混凝土的抗冻融性能,对三种胶凝材料体系的混凝土,在四种不同水胶比下,进行快速冻融试验与压汞试验。从外观损伤、质量损失、相对动弹性模量及孔隙结构等方面研究其抗冻融性能退化规律。结果表明:在相同条件下,适当降低水胶比可以提高混凝土的抗冻融性能;与普通混凝土相比,由石灰石粉、矿渣和粉煤灰等矿物掺合料与水泥组成的复合胶凝材料体系,提高了混凝土抗冻融性能;因矿渣活性高于粉煤灰,“20%(质量分数,下同)石灰石粉+15%粉煤灰+15%矿渣”混凝土抗冻融性能弱于“20%石灰石粉+30%矿渣”混凝土;矿物掺合料能细化混凝土孔径,提升抗冻融性能。通过理论分析与试验数据回归,建立了不同胶凝材料体系下复合石灰石粉-粉煤灰-矿渣混凝土冻融损伤模型。To investigate the freeze-thaw resistance of composite limestone powder-fly ash-slag concrete,rapid freeze-thaw test and mercury compression test were conducted on concrete of three cementitious material systems at four different water to binder ratios.The degradation law of the freeze-thaw resistance was studied in terms of appearance damage,mass loss,relative dynamic elastic modulus and pore structure.The results show that:under the same conditions,the freeze-thaw resistance of concrete can be improved by appropriately reducing the water to binder ratio.Compared with ordinary concrete,the composite cementitious material system composed of mineral admixtures such as limestone powder,slag and fly ash and cement improves the freeze-thaw resistance of concrete.Because the activity of slag is higher than that of fly ash,"20%(mass fraction,the same below)limestone powder+15%fly ash+15%slag"concrete is weaker than"20%limestone powder+30%slag"concrete.The mineral admixture can refine the pore size of concrete and improve the freeze-thaw resistance.Through theoretical analysis and regression of experimental data,the freeze-thaw damage model of composite limestone powder-fly ash-slag concrete with different cementitious material systems was established.

关 键 词：复合石灰石粉-粉煤灰-矿渣混凝土 抗冻融性能 压汞试验 外观损伤 质量损失 相对动弹性模量 冻融损伤模型 

分 类 号：TU528[建筑科学—建筑技术科学]