The role of hydrotalcite in chloride binding and corrosion protection in concretes with ground granulated blast furnace slag
The role of hydrotalcite in chloride binding and corrosion protection in concretes with ground granulated blast furnace slag
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DOI：
10.1016/j.cemconcomp.2012.04.009
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发表时间：
2012-09
影响因子：
10.5
通讯作者：
O. Kayali;M. Khan;M. S. Ahmed
中科院分区：
文献类型：
--
作者：
O. Kayali;M. Khan;M. S. Ahmed
本文提出了一种调查的程度和原因的观察到的改善性能，粒化高炉矿渣（GGBFS）有助于防止氯离子引发的腐蚀。对掺水泥混凝土进行的试验包括快速氯离子渗透试验（RCPT）、长期积水、腐蚀电流监测、孔径分布和X射线衍射分析。随着矿渣粉比例的增加，RCPT和腐蚀电流值显著降低。结果表明，孔径分布只有很小的细化，以及形成弗里德尔盐的迹象。然而，测试揭示了在GGBFS共混物中形成水滑石作为重要的水合产物。结果进一步证明了水滑石对氯离子的有效结合。作者将腐蚀电流的降低归因于GGBFS水合产物中形成的水滑石对氯离子的有效结合。
This paper presents an investigation into the extent and reasons of the observed improvement in performance that ground granulated blast furnace slag (GGBFS) contributes against chloride initiated corrosion. Tests conducted on concretes with blended cement included Rapid Chloride Permeability Test (RCPT), long term ponding, corrosion current monitoring, pore size distribution and X-ray diffraction analyses. Values of the RCPT and corrosion current were significantly reduced as the proportion of GGBFS increased. The results showed only small refinements in pore size distribution, as well as indications of the formation of Friedel’s salt. The tests however, revealed the formation of hydrotalcite as a significant hydration product in GGBFS blends. The results further demonstrated the efficiency of hydrotalcite in binding chloride ions. The authors attribute the reduction in corrosion current to the efficient binding of chloride ions by the hydrotalcite that forms in GGBFS hydration products.