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

doi:10.11896/cldb.22090297

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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)₂solution 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.

Key words： carbonization curing regimes alkali-activated slag concrete pore structure electrochemical test weight loss rate steel corrosion

Published: Online: 2024-06-25

CLC number:

TU528

Fund:National Natural Science Foundation of China(51708120, 51878179), the Natural Science Foundation of Fujian Province (2021J02021).

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	Articles by authors
	LIANG Yongning
	LIU Wudong
	ZHAO Kai
	JI Tao

Cite this article:

LIANG Yongning,LIU Wudong,ZHAO Kai, et al. Effect of Different Curing Regimes on the Corrosion of Alkali-Activated Slag Concrete Reinforcement Under Carbonation Environment[J]. Materials Reports, 2024, 38(11): 22090297-8.

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http://www.mater-rep.com/EN/10.11896/cldb.22090297 OR http://www.mater-rep.com/EN/Y2024/V38/I11/22090297

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