The influence of sodium hydrogen carbonate on the hydration of cement
The influence of sodium hydrogen carbonate on the hydration of cement
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DOI：
10.1016/j.conbuildmat.2015.07.121
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发表时间：
2015-09
影响因子：
7.4
通讯作者：
J. Jang;H. Kim;Solmoi Park;H. Lee
中科院分区：
文献类型：
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作者：
J. Jang;H. Kim;Solmoi Park;H. Lee
Ca(OH)2 的存在可能会对硫酸盐的耐受性产生不利影响，而 Ca(OH)2 的缺乏会降低 pH 值，导致钢筋混凝土中的钢材腐蚀。本研究的测试结果表明，添加NaHCO3可使水泥浆体内均匀发生碳化，导致Ca(OH)2的消耗。尽管消耗了 Ca(OH)2，但发现 pH 值因 NaOH 的产生而增加。强度试验结果表明，NaHCO3添加量小于5%时，强度提高，但超过5%时，则产生不利影响。这里的结果为提高混凝土耐久性的潜在方法提供了新的见解。
The presence of Ca(OH)2may adversely influence resistance to sulfates, while its absence reduces the pH, leading to corrosion of the steel in reinforced concrete. Test results of the present study showed that adding NaHCO3allowed carbonation to occur uniformly within the cement paste, resulting in the consumption of Ca(OH)2. Despite the consumption of Ca(OH)2, the pH was found to increase by production of NaOH. Strength test results showed that an addition of NaHCO3of less than 5% enhanced the strength, but that exceeding 5% had an adverse effect. The results here provide new insight into potential means to improve the durability of concrete.