Effect of carbonic acid water on the degradation of Portland cement paste: Corrosion process and kinetics
Effect of carbonic acid water on the degradation of Portland cement paste: Corrosion process and kinetics
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DOI：
10.1016/j.conbuildmat.2015.05.046
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发表时间：
2015-08
影响因子：
7.4
通讯作者：
Suhong Yin;Yong-feng Yang;Tongsheng Zhang;Gao-feng Guo;Fang Yu
中科院分区：
文献类型：
--
作者：
Suhong Yin;Yong-feng Yang;Tongsheng Zhang;Gao-feng Guo;Fang Yu
地下混凝土结构经常遭受碳酸水腐蚀，因此对水泥基材料进行碳酸水腐蚀的评价和预测是非常重要的。将波特兰水泥浆体浸泡在再生碳酸水溶液中，跟踪其腐蚀过程。结果表明，在腐蚀的前7天内，试样没有出现明显的腐蚀现象，而在腐蚀28天后，试样出现了明显的腐蚀现象。根据剖面上Ca/Si摩尔比的大小，可将腐蚀带划分为3个区域，从内到外依次发生CH的溶解、碳酸盐的碳酸化和溶解以及水化产物的多次脱钙作用。在实验数据的基础上，提出了波特兰水泥石的碳酸水腐蚀模型，并利用实验数据对腐蚀动力学进行了理论推导和拟合，该模型可用于预测波特兰水泥石的碳酸水腐蚀。
Underground concrete structures usually suffer from carbonic acid water corrosion, thus evaluation and prediction of the carbonic acid water corrosion are very important for cement-based materials. Portland cement pastes were immersed into a renewal carbonic acid water, then the corrosion process was followed in this paper. The results show that no obvious corrosion was observed in the first 7 days, while significant corrosion was observed after 28 days corrosion. The corroded zone can be divided into three regions according to the Ca/Si molar ratio of the cross section, where dissolution of CH, carbonation and dissolution of carbonates, and multi-decalcification of hydration products occurred gradually from the internal to the external. Based on the experimental data, a carbonic acid water corrosion model of Portland cement paste was proposed, then the corrosion kinetics, which can be used to predict the carbonic acid water corrosion of Portland cement paste, was theoretically deduced and fitted using the experimental data.