粉煤灰高性能混凝土气体渗透性能研究  被引量:10

Study on Gas Permeability of High Performance Concrete with Fly Ash

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作  者:施惠生[1] 许碧莞[1] 

机构地区:[1]同济大学先进土木工程材料教育部重点实验室,上海200092

出  处:《同济大学学报(自然科学版)》2007年第9期1230-1234,共5页Journal of Tongji University:Natural Science

基  金:国家"九七三"重点基础研究发展计划资助项目(2001CB610705)

摘  要:试验研究了水胶比m(水):m(胶)在0.25~0.35范围内,粉煤灰掺量在0~60%之间的粉煤灰高性能混凝土气体渗透性能情况.结合汞压力测孔法分析了粉煤灰高性能混凝土气体渗透性能与孔结构参数之间的相关性、研究结果表明,水胶质量比0.25~0.30,粉煤灰高性能混凝土气体渗透系数随水胶质量比增加而增大;水胶质量比0.30~0.35,粉煤灰高性能混凝土气体渗透系数却随水胶质量比增大而减小;且粉煤灰对高性能混凝土气体渗透性能的影响受水胶质量比影响较大;养护龄期的延长可以明显改善混凝土的抗气体渗透性.粉煤灰高性能混凝土总孔隙率、孔临界孔径、平均孔径与气体渗透系数之间线性拟合相关系数分别为0.93,0.90,0.83,可以用这些结构参数近似表征粉煤灰高性能混凝土的气体渗透性能。This paper presents a study of the Gas permeability of fly ash high performance concrete (HPC) with different water-binder ratios ( m (W) : m (B)) ranging 0.25 -0.35 and different fly ash dosages ranging 0-60 %. Concrete pore structures were also analyzed by mercury intrusion porosimetry (MIP). Results show that when m (W):m (B) increases from 0.25 to 0.30, the gas permeability coefficients of fly ash HPC increase correspondingly; when m (W) : m (B) increases from 0, 30 to 0.35, the gas permeability coefficients decrease. Influence of fly ash on gas permeability resistance of fly ash HPC is greatly affected by m (W) : m (B). And curing can greatly improve gas permeability resistance. The linearity correlation coefficients between gas permeability coefficient and the total porosity, the threshold pore diameter and the mean pore diameter are 0.93, 0.90, 0.83. These pore structure parameters may represent the gas permeability resistance performance of HPC.

关 键 词:粉煤灰 高性能混凝土 气体渗透性 孔结构参数 相关性 

分 类 号:TU502[建筑科学—建筑技术科学]

 

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