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作 者:张俊芝[1,2] 张昊泽 邵鑫杰 章玉容 高延红 ZHANG Junzhi;ZHANG Haoze;SHAO Xinjie;ZHANG Yurong;GAO Yanhong(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Key Laboratory of Civil Engineering Structure&Disaster Prevention and Mitigation Technology of Zhejiang Province,Hangzhou 310014,China)
机构地区:[1]浙江工业大学土木工程学院,浙江杭州310014 [2]浙江省工程结构与防灾减灾技术研究重点实验室,浙江杭州310014
出 处:《自然灾害学报》2021年第4期64-72,共9页Journal of Natural Disasters
基 金:国家自然科学基金项目(52079124,51279181);浙江省自然科学基金项目(LY19E090006,LQ18G010007,LY17E090007)。
摘 要:用压差稳定法测得不同水灰比的普通混凝土在不同饱和度和不同附加气压时的气体表观渗透系数,并用MIP法测试了混凝土的微观参数;计算得到混凝土气体本征渗透系数和滑脱因子,分析了混凝土水灰比、样本饱和度和附加气压对滑脱效应的影响;分析了混凝土孔隙率、各孔径的占比和中值孔径等孔结构参数对不同水灰比混凝土气体滑脱效应的影响。结果表明:随着混凝土水灰比的减小和样本饱和度的增加,滑脱因子b和气体本征渗透系数均减小;混凝土水灰比,即混凝土的微观结构及孔径分布对气体滑脱效应的影响最大。随着水灰比的增大,混凝土的孔隙率增大,孔隙中的毛细孔(50~100 nm)的占比和中值孔径也随之增大,混凝土的气体滑脱效应越明显。因此,混凝土中接近滑脱效应临界孔的50~100 nm的毛细孔及其占比,对混凝土气体滑脱效应的影响最大。此外,在绝干状态的混凝土,当其中值孔径达到46 nm时,滑脱因子最大,即气体滑脱效应最明显。In this paper,the apparent gas permeability coefficients of ordinary concrete with different water cement ratios at different saturations and additional pressures were measured by pressure differential stability method,and the microstructural parameters of concrete were tested by the MIP method.The intrinsic gas permeability coefficient and slippage factor of concrete were calculated,and the effects of water cement ratio,sample saturation and additional pressure on the slippage effect were analyzed.The effect of water cement ratio on the gas slippage effect of concrete was studied by the pore structure parameters such as porosity,proportion of pore diameter and median pore diameter.The results show that the slippage factor and intrinsic gas permeability coefficient decrease with the decreasing water cement ratio and the increasing sample saturation.Water cement ratio,also the microstructure and pore size distribution of concrete,has the greatest influence on the gas slippage effect.With the increasing water cement ratio,the porosity of concrete increases,the proportion of capillary pores(50-100 nm)and the median pore size also increases,and the gas slippage effect of concrete becomes more obvious.Therefore,the capillary pores of 50-100 nm closed to the critical pores which will cause the slippage effect in concrete and their proportion have the greatest influence on the gas slippage effect.Moreover,in the absolutely dry state,when the median pore size reaches 46 nm,the slippage factor is the largest,that is,the gas slippage effect is the most obvious.
分 类 号:TU502[建筑科学—建筑技术科学] X9[环境科学与工程—安全科学]
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