Chlorine diffusion resistivity of sustainable green concrete in harsh marine environments
Chlorine diffusion resistivity of sustainable green concrete in harsh marine environments
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DOI：
10.1016/j.jclepro.2016.10.015
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发表时间：
2017-01
影响因子：
11.1
通讯作者：
M. Valipour;M. Shekarchi;M. Arezoumandi
中科院分区：
文献类型：
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作者：
M. Valipour;M. Shekarchi;M. Arezoumandi
混凝土中使用的水泥是生产过程中释放大量CO2的材料之一。大多数研究都集中在用任何天然和/或可回收的成分取代水泥。另一方面，耐久性应考虑在腐蚀性环境中的混凝土构件，特别是钢筋混凝土基础设施的任何变化的情况下，因为氯离子引起的腐蚀是目前海洋钢筋混凝土结构的主要问题之一。沸石作为一种天然辅助胶凝材料，可以替代水泥，用于配制可持续发展的生态友好混凝土。在这项研究中，进行了一项实验研究，以评估混凝土试样的耐久性，天然沸石（0-30%的水泥替代品），偏高岭土（0-15%的水泥替代品）和硅灰（0-10%的水泥替代品）的氯离子扩散暴露在恶劣的海洋环境中的潮汐和飞溅，沿着在实验室条件下的平行研究。本研究结果表明，沸石在混凝土中的最佳替代水平在10%和20%之间的范围内获得导致在侵蚀性环境中的混凝土耐久性方面的抗氯离子渗透性提高60%-70%。
Cement used in concrete is one of those materials which the production process is releasing considerable amount of CO2. Most researches are focusing on replacing cement with any natural and/or recyclable components. On the other hand, durability should be taken into account in case of any changes in concrete components especially in reinforced concrete infrastructures in aggressive environments since chloride-induced corrosion is currently one of the main issues in marine reinforced concrete structures. Zeolite, a type of natural supplementary cementitious material, can be used as replacement of cement in order to make sustainable eco-friendly concrete. In this research, an experimental study was conducted to evaluate the durability of concrete specimens incorporating natural zeolite (0–30% cement replacement), metakaolin (0–15% cement replacement) and silica fume (0–10% cement replacement) in terms of chloride diffusion exposed to tidal and splash exposures in a harsh marine environment, along with a parallel study under laboratory conditions. Results of this study indicated that the optimum replacement level for zeolite in concrete obtained in a range between 10% and 20% resulted in 60%–70% improvement in chloride penetration resistance in terms of concrete durability in aggressive environments.