Effect of Different Curing Regimes on the Corrosion of Alkali-Activated Slag Concrete Reinforcement Under Carbonation Environment
LIANG Yongning1,2,*, LIU Wudong1, ZHAO Kai2, JI Tao2
1 School of Advanced Manufacturing, Fuzhou University, Quanzhou 362251, Fujian, China 2 College of Civil Engineering, Fuzhou University, Fuzhou 350108, China
Abstract: In this work, the effects of standard curing, saturated Ca(OH)2 solution curing and autoclave curing on the corrosion of reinforcement in alkali-activated slag concrete with CaO+Na2CO3 as the exciter (CNC) were investigated under accelerated carbonation environment (CO2 concentration of 20%). The results show that compared with standard curing, saturated Ca(OH)2 solution curing does not change the hydration products of CNC but can make the early hydration of CNC more sufficient. Therefore, the average pore size decreases. Autoclaving curing converts the hydration products of CNC from C-S-H gel into hydrogarnet and 11-Å type tobermorite. Therefore, the average pore size and total poro-sity decrease significantly. Under the same accelerated carbonization conditions, compared with standard curing, the carbonization depth of CNC decreased, the high probability corrosion time of reinforcement in CNC delayed, and the weight loss rate of reinforcement in CNC decreased both in saturated Ca(OH)2 solution curing and in autoclaving curing. Under the same curing conditions, the corrosion resistance of steel bars in CNC cured by standard curing and saturated Ca(OH)2 solution is much less than that in ordinary Portland cement concrete. The corrosion resistance of steel bars in CNC cured by autoclaving was better than that in ordinary Portland cement concrete.
梁咏宁, 刘务东, 赵凯, 季韬. 加速碳化条件下不同养护制度对碱矿渣混凝土钢筋锈蚀的影响[J]. 材料导报, 2024, 38(11): 22090297-8.
LIANG Yongning, LIU Wudong, ZHAO Kai, JI Tao. Effect of Different Curing Regimes on the Corrosion of Alkali-Activated Slag Concrete Reinforcement Under Carbonation Environment. Materials Reports, 2024, 38(11): 22090297-8.
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2024, Vol. 38 
