Utilization of rice husk–bark ash to improve the corrosion resistance of concrete under 5-year exposure in a marine environment
Utilization of rice husk–bark ash to improve the corrosion resistance of concrete under 5-year exposure in a marine environment
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DOI：
10.1016/j.cemconcomp.2012.12.007
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发表时间：
2013-03
影响因子：
10.5
通讯作者：
W. Chalee;T. Sasakul;P. Suwanmaneechot;C. Jaturapitakkul
中科院分区：
文献类型：
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作者：
W. Chalee;T. Sasakul;P. Suwanmaneechot;C. Jaturapitakkul
利用废稻壳-树皮灰来提高海洋环境中混凝土的耐久性。报道并讨论了稻壳-树皮灰粉 (GRBA) 对暴露于海洋场地 5 年的混凝土的抗压强度、氯离子扩散系数、氯离子结合能力和钢筋腐蚀的影响。 GRBA 用作火山灰材料，以粘合剂重量的 0%、15%、25%、35% 和 50% 代替 I 型波特兰水泥。浇筑200mm的混凝土立方体试件，并将钢筋埋入混凝土中。混凝土样本暴露于泰国湾海水潮汐区。经过5年的暴露后，对试件进行抗压强度、酸溶性和水溶性氯化物以及嵌入钢筋的腐蚀测试。结果表明，在5年暴露期间，GRBA混凝土的强度增长速度快于I型波特兰水泥混凝土，并且GRBA混凝土没有发现强度损失。研究结果还表明，使用高达 35% 的 GRBA 可以显着提高混凝土在氯离子扩散系数、氯离子结合能力和嵌入式钢材耐腐蚀性方面的耐久性。
Waste rice husk–bark ash was utilized to improve the durability of concrete in a marine environment. The effects of ground rice husk–bark ash (GRBA) on compressive strength, chloride diffusion coefficient, chloride binding capacity, and steel corrosion of concrete exposed to a marine site for 5years were reported and discussed. The GRBA was used as a pozzolanic material to replace Type I Portland cement at 0%, 15%, 25%, 35%, and 50% by weight of the binder. Concrete cube specimens of 200mm were cast, and steel bars were embedded in concrete. Concrete specimens were exposed to a tidal zone of seawater in the Gulf of Thailand. After 5-year exposure, the specimens were tested for compressive strength, acid soluble and water soluble chlorides and corrosion of embedded steel bar. The results showed that during 5-year exposure, GRBA concretes gained strength faster than Type I Portland cement concretes and no strength loss was found in GRBA concrete. The findings also indicated that the durability of concrete in terms of chloride diffusion coefficient, chloride binding capacity, and resistance to corrosion of embedded steel could be considerably improved by utilizing GRBA as high as 35%.