铁道科学与工程学报2016，Vol.13Issue(4)：648-653,6.
低温(3℃)养护条件下不同水灰比混凝土细观孔结构及抗氯离子渗透性试验研究
Research on theeffect low temperature (3 ℃)curing condition and various water-cement ratio have on theresistance to chlorideions penetration and mesoscopic structure of concrete
摘要
Abstract
In order to study the influence rule and degree of the chloride penetration resistance and mesoscopic structure of concrete,stomatal analysis method and DC power law are adopted in this research.These two meth-ods are used to measure the mesostructure and DC value of the concrete with different water-cement ratio cured 28 days under low temperature (3 ℃)and standard curing condition.The result shows that:the effect on con-crete pore size distribution is obvious with low temperature (3 ℃)curing condition on the different water-ce-ment ratio of concrete.When the aperture is seriously coarsened,the coarse pore increases apparently,and the number of mesoscopic pore decreased.Pore spacing factor and average pore diameter were significantly greater than the corresponding concrete standard curing conditions,and it goes larger with a higher water-cement ratio. But under the condition of low temperature (3 ℃),it behaves a relatively higher effect on the average pore di-ameter of concrete with a lower water-cement ratio and lower effect on it with a relatively higher water-cement ratio.The DC value is higher on concrete with different water-cement ratio cured 28d than it is cured under standard curing conditions.Besides,the DC value goes higher as the increase of water-cement ratio,and the chloride penetration resistance decreases at the same time.Low temperature has negative effect both on concrete pore structure with different water-cement ratio and the chloride penetration resistance.It leads to the degrada-tion of concrete mesoscopic structure and the decrease of permeability.The effect of low temperature on concrete with lower water-cement ratio is also higher.关键词
低温养护条件/水灰比/混凝土/孔结构/渗透性Key words
low temperature curing condition/water-cement 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,张少华,徐瑞鹏..低温(3℃)养护条件下不同水灰比混凝土细观孔结构及抗氯离子渗透性试验研究[J].铁道科学与工程学报,2016,13(4):648-653,6.基金项目
国家自然科学基金资助项目(51268032) （51268032）
长江学者和创新团队发展计划资助项目(IRT1139) （IRT1139）
西北干寒地区材料与结构耐久性研究基金项目 （）
