Influence factors of sulfate attack on cement-based materials subjected to electrical pulse

被引：2

作者：

Huang, Qian ^{[1
]}

Wang, Chong ^{[1
]}

Yang, Changhui ^{[1
]}

Zhou, Limin ^{[1
]}

Yin, Jiqiang ^{[1
]}

机构：

[1] College of Materials Science and Engineering, Chongqing University, Chongqing

来源：

Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2014年 / 44卷 / 05期

关键词：

Acceleration; Cement-based materials; Electrical pulse; Influence factors; Sulfate attack;

D O I：

10.3969/j.issn.1001-0505.2014.05.029

中图分类号：

学科分类号：

摘要：

The effects of the water-cement ratio, types of attack solution and the period of pulse on sulfate attack on cement mortars subjected to electrical pulse were investigated through electrical pulse speeding up the migration of external sulfate ions into cement-based materials. The microstructures of the damaged specimens were examined by scanning electron microscope. The results show that for the mortars with the water-cement ratios of 0.3, 0.4 and 0.5, after immersion in the attack solution of Na2SO4 for 180 d, the flexural coefficients are 1.03, 0.98 and 0.94, respectively, and the compressive strength coefficients are 1.02, 0.96 and 0.90, respectively. However, after using electrical pulse for 30 d, the flexural coefficients are changed into 0.98, 0.95 and 0.90, respectively, and the compressive strength coefficients are 0.97, 0.96 and 0.91, respectively. A large amount of ettringite form in the damaged specimens, indicating that electrical pulse accelerates the erosion of cement-based mortars due to sulfate attack. When MgSO4 is used as the attack solution under electrical pulse, some calcium silicate hydrate (CSH) gel converts into non-cohesive magnesium silicate hydrate (MSH), resulting in greater strength loss of the specimens compared with that caused by sodium sulfate attack. Moreover, the deterioration degree of the specimens subjected to electrical pulse with the period of 10 s is greater than that with the period of 20 s.

引用

页码：1041 / 1045

页数：4

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