Enhancement of Compressive Strength and Durability of Sulfate-Attacked Concrete

被引：1
作者：
Han, Meiqin [1 ]
Li, Jianguo [2 ]
机构：
[1] Lyuliang Univ, Dept Architecture & Civil Engn, Lvliang 033001, Peoples R China
[2] Shanxi Inst Technol, Dept Civil Engn, Yangquan 045000, Peoples R China
来源：
BUILDINGS | 2024年 / 14卷 / 07期
关键词：
compressive strength; sulfate; concrete; chloride ion permeation coefficient; carbonation depth; LIMESTONE CEMENT CONCRETE; MINERAL ADMIXTURES; THAUMASITE FORM; RESISTANCE; DETERIORATION; PERFORMANCE; BEHAVIOR; CHLORIDE;
D O I：
10.3390/buildings14072187
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
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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页数：17
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