Understanding the interacted mechanism between carbonation and chloride aerosol attack in ordinary Portland cement concrete
Understanding the interacted mechanism between carbonation and chloride aerosol attack in ordinary Portland cement concrete
复制标题
了解普通波特兰水泥混凝土碳化和氯化物气溶胶侵蚀之间的相互作用机制
DOI：
10.1016/j.cemconres.2017.02.032
复制
发表时间：
2017-05-01
影响因子：
11.4
通讯作者：
Ma, Yueshan
中科院分区：
文献类型：
--
作者：
Liu, Jun;Qiu, Qiwen;Ma, Yueshan
为了了解普通硅酸盐水泥（OPC）混凝土中碳化与氯化物气溶胶侵蚀的相互作用机理，进行了试验研究。评价了碳化对氯离子分布、氯离子结合能力和氯离子扩散系数的影响。此外，还研究了氯化物气溶胶对碳酸化速率的影响。水灰比分别为0.38、0.47和0.53的混凝土试件。试验结果表明，碳化作用显著影响了氯离子分布，降低了氯离子的结合能力，加快了氯离子在混凝土中的扩散速度。此外，氯离子气溶胶的存在会降低碳化深度，使碳化混凝土的pH值升高。通过扫描电镜和压汞孔隙度法研究了污染混凝土的微观形态、孔隙度和孔径分布等特征，为上述研究结果提供了有力的证据。(C) 2017 Elsevier Ltd.版权所有。
An experimental study is carried out with the aim to understand the interacted mechanism between carbonation and chloride aerosol attack in ordinary Portland cement (OPC) concrete. Effects of carbonation on the chloride profile, the chloride binding capacity and the chloride diffusion coefficient are evaluated. Besides, effect of chloride aerosol attack on the carbonation rate is investigated. Concrete specimens with three water-to-cement ratios (0.38, 0.47 and 0.53) are fabricated in this work. Tested results demonstrate that carbonation remarkably affects the chloride profile, reduces the chloride binding capacity, and also accelerates the rate of chloride ion diffusion of concrete. Besides, the presence of chloride aerosol can lead to lower the carbonation depth and increase the pH value of carbonated concrete. Microscopic properties such as morphology, porosity, and pore size distribution for the contaminated concretes are explored by scanning electron microscope and mercury intrusion porosimetry, which provide strong evidence to these research findings. (C) 2017 Elsevier Ltd. All rights reserved.