A study on the chloride diffusion behavior of blended cement concrete in relation to aggregate and ITZ
A study on the chloride diffusion behavior of blended cement concrete in relation to aggregate and ITZ
复制标题
掺混水泥混凝土氯离子扩散行为与骨料和ITZ的关系研究
DOI：
10.1016/j.conbuildmat.2019.07.068
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发表时间：
2019-10
影响因子：
7.4
通讯作者：
De Schutter Geert
中科院分区：
文献类型：
--
作者：
Wu Kai;Long Jiangfeng;Xu Linglin;De Schutter Geert
氯离子引起的钢筋锈蚀是暴露在海洋环境或除冰盐中的结构混凝土的主要威胁之一。氯化物的渗透性在很大程度上取决于孔结构。从界面过渡区(ITZ)的角度，研究了不同骨料体积分数和粒径分布的混凝土中孔隙对氯离子扩散的影响。用压汞孔度计(MIP)分析了孔结构与粘结剂组成和集合体的关系。结果表明，随着骨料含量从0增加到0.2，混凝土的扩散系数先减小，然后略有增加。粗骨料制成的试件扩散系数增大。掺入适量的混合料可以缓解骨料对氯离子扩散的影响。增加骨料体积含量或减小平均粒径，使总气孔侵入体积大于100 nm，对总气孔率的增加贡献最大。考虑到石灰石填料和矿渣对水泥浆体内部孔结构的影响，氯离子扩散系数的降低可能主要是由于基质的致密化。
The reinforcement corrosion caused by chloride is one of the main threat to structural concrete exposed to marine environment or de-icing salts. The penetration of chloride is highly determined by the pore structure. In this study, the effect of pores on chloride diffusion of concrete made with varied aggregate volume fraction and size distribution was evaluated from the interfacial transition zone (ITZ) point of view. The pore structure was analyzed by using mercury intrusion porosimeter (MIP) in relation to the binder compositions and aggregates. Results show that the diffusivity decreases firstly with increasing aggregate content from 0 to 0.2, and followed by a slight increase in the pure cement group. The diffusivity increases for the specimens made with coarser aggregate. The addition of appropriate amount of blended materials could mitigate the influence of aggregate on the chloride diffusion. Increasing aggregate volume content or reducing the mean particle size, which increase the total intruded volume of pores superior to 100 nm, contribute most to the increase of total porosity. Considering the effect of limestone filler and slag on the pore structure within ITZ and bulk cement paste, the reduction in chloride diffusivity could be mainly due to the densification of the matrix.
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影响因子：
7.4
作者：
D. Xuan;Z. Shui;Shaopeng Wu
通讯作者：
D. Xuan;Z. Shui;Shaopeng Wu
界面过渡带和互连对硅酸盐水泥砂浆氯离子迁移的影响
影响因子：
2
作者：
Kai Wu;Linglin Xu;Geert De Schutter;Huisheng Shi;Guang Ye
通讯作者：
Guang Ye
DOI：
10.1002/maco.201206716
发表时间：
2012-12
期刊：
Materials and Corrosion
影响因子：
--
作者：
C. Page
通讯作者：
C. Page
影响因子：
11.4
作者：
Xie Ping;J. Beaudoin;R. Brousseau
通讯作者：
Xie Ping;J. Beaudoin;R. Brousseau
DOI：
10.1023/b:ints.0000042339.92990.4c
发表时间：
2004-10-01
期刊：
INTERFACE SCIENCE
影响因子：
--
作者：
Scrivener, KL;Crumbie, AK;Laugesen, P
通讯作者：
Laugesen, P