Chloride-initiated corrosion in alkali activated reinforced concrete
Chloride-initiated corrosion in alkali activated reinforced concrete
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DOI：
10.1016/j.cemconcomp.2020.103823
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发表时间：
2021-01
影响因子：
10.5
通讯作者：
P. Mangat;Olalekan O. Ojedokun;Paul Lambert
中科院分区：
文献类型：
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作者：
P. Mangat;Olalekan O. Ojedokun;Paul Lambert
普通波特兰水泥（PC）作为混凝土中的主要粘合剂的使用通过在水泥生产期间消耗化石燃料和排放二氧化碳（CO2）而带来显著的环境挑战。用碱活化胶凝材料（AACM）制成的混凝土试样暴露于腐蚀诱导环境1750天以监测其相对耐久性，所述碱活化胶凝材料（AACM）由替代粘合剂和常规波特兰水泥混凝土制成。AACM混凝土比PC混凝土具有更高的腐蚀电位Ecorr和腐蚀电流密度Icorr，这是由于AACM混凝土中孔隙溶液中高浓度的硫化物引起的钢筋表面周围的还原环境所致。AACM混凝土的耐腐蚀性随着碱激发剂的摩尔浓度的增加而增加，在恒定的液体与粘合剂的比例。在AACM混凝土中点蚀开始的阈值Cl−/OH−值在2.1和2.8之间，而对照PC混凝土为1.08。在这项研究中评估的AACM混凝土表现出更大的抵抗氯离子引起的腐蚀比PC混凝土。
The use of ordinary Portland cement (PC) as the principal binder in concrete brings with it significant environmental challenges through the consumption of fossil fuels and emission of carbon dioxide (CO2) during cement production. Concrete specimens made with an alkali activated cementitious material (AACM) produced from an alternative binder and conventional Portland cement concrete were exposed to corrosion inducing environments for 1750 days to monitor their relative durability. AACM concrete shows higher corrosion potentialEcorrand corrosion current densitiesIcorrthan PC concrete due to a reducing environment around the steel surface in AACM concrete, caused by high sulfide concentration in the pore solution. Corrosion resistance of the AACM concretes increases with increasing molarity of the alkali activator, at a constant liquid to binder ratio. The threshold Cl−/OH−value for pitting corrosion initiation in the AACM concrete is between 2.1 and 2.8 compared with 1.08 for the control PC concrete. The AACM concrete evaluated in this study showed greater resistance to chloride induced corrosion than the PC concrete.