铁道科学与工程学报2016，Vol.13Issue(5)：842-847,6.
不同养护条件下低水胶比混凝土抗氯离子渗透性及孔结构试验研究
Study of the resistance to chloride ions penetration and pore structure of concrete with low water-binder ratio under various curing conditions
摘要
Abstract
In order to study the influencing mechanism of various curing conditions on the resistance to chloride i-ons penetration and pore structure of concrete with low water-binder ratio,porosity analysis,mercury injection method,Electric flux method and RCMmethod were adopted in the study.These methods were used in the experi-ment to test the pore structure and the resistance to chloride ions penetration of the low water-binder ratio concrete after curing 28d.The result shows that the aperture of concrete with low water-binder ratio after being cured un-der minus temperature (-3℃)and low temperature (3℃)is obviously roughened than is cured under standard conditions.The number of larger aperture increases,while the number of smaller apertures decreases.The bubbles spacing factor and average pore size increase.The number of more harmful holes,the critical aperture and maxi-mum probability aperture in concrete with low water-binder ratio is evidently larger than the concrete cured under standard conditions,of which the difference is even more obvious under minus temperature.The electric flux and chloride ion migration coefficient of concrete with low water-binder ratio cured 28d are apparently larger than con-crete cured under standard conditions with the resistance to chloride ions penetration significantly reduced.The de-scending degree of resistance to chloride ions penetration is large under minus curing condition,mainly because the minus temperature not only enhances the connectivity of the pores,roughens the pores and degrades the pores,but also creates irreversible damage to concrete inner pore structure to a certain extent.关键词
不同养护条件/低水胶比/混凝土/孔结构/渗透性Key words
various curing conditions/low water-binder ratio/concrete/pore structure/penetrability分类
建筑与水利引用本文复制引用
段运,王起才,张戎令,谢超..不同养护条件下低水胶比混凝土抗氯离子渗透性及孔结构试验研究[J].铁道科学与工程学报,2016,13(5):842-847,6.基金项目
国家自然科学基金资助项目（51268032）；长江学者和创新团队发展计划资助项目 （）
