Enhancement of Compressive Strength and Durability of Sulfate-Attacked Concrete

Buildings Pub Date : 2024-07-16 DOI:10.3390/buildings14072187

Meiqin Han, Jianguo Li

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Abstract

This experimental study is carried out in order to improve the properties of sulfate-attacked concrete. The concrete specimens were immersed in 15% Na2SO4 solution before being protected with a concrete repairing agent (CRA). The effects of sulfate corrosion time, the curing time after being attacked, and the concrete repairing agent on concrete were investigated. The experimental results indicate that the properties slightly increased after being attacked by sulfate for 60 days than for 30 days. However, they decreased after being attacked by sulfate for 90 days. CRA could effectively improve the properties of sulfate-attacked concrete. After being re-cured for 7 days, the properties of the sulfate-attacked concrete were significantly improved in comparison with those of the specimens taken out from the sulfate solution immediately. When the specimens were attacked for three months, the compressive strength of specimens coated with CRA was increased by 6.1%, 6.4%, and 6.4% compared to that of the specimens without CRA after being cured for 7 to 56 days, respectively. The carbonation depth of concrete specimens with CRA was reduced by 4.6%, 8.3%, and 4.9%, respectively. However, the chloride ion permeation coefficient of concrete with CRA decreased by 20.3%, 28.5%, and 28.7%, respectively, for the concrete immersed in sulfate for one month.

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提高硫酸盐侵蚀混凝土的抗压强度和耐久性

本实验研究旨在改善硫酸盐侵蚀混凝土的性能。混凝土试件先浸泡在 15% 的 Na2SO4 溶液中，然后再用混凝土修补剂（CRA）进行保护。研究了硫酸盐腐蚀时间、受侵蚀后的养护时间和混凝土修补剂对混凝土的影响。实验结果表明，受硫酸盐侵蚀 60 天后的性能比受硫酸盐侵蚀 30 天后略有提高。但受硫酸盐侵蚀 90 天后，性能有所下降。CRA 可以有效改善硫酸盐侵蚀混凝土的性能。重新养护 7 天后，硫酸盐侵蚀混凝土的性能与立即从硫酸盐溶液中取出的试样相比有明显改善。当试件受侵蚀三个月后，涂有 CRA 的试件在养护 7 天至 56 天后的抗压强度与未涂 CRA 的试件相比分别提高了 6.1%、6.4% 和 6.4%。添加了 CRA 的混凝土试样的碳化深度分别降低了 4.6%、8.3% 和 4.9%。然而，在硫酸盐中浸泡一个月的混凝土中，含有 CRA 的混凝土的氯离子渗透系数分别降低了 20.3%、28.5% 和 28.7%。

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Buildings

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