东南大学学报（自然科学版）Issue(5)：1041-1045,5.DOI:10.3969/j.issn.1001-0505.2014.05.029
电脉冲作用下水泥基材料硫酸盐侵蚀的影响因素
Influence factors of sulfate attack on cement-based materials subjected to electrical pulse
摘要
Abstract
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 microstruc-tures 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 Na2SO4for 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,respective-ly,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 electri-cal 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 so-dium 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.关键词
电脉冲/水泥基材料/加速/硫酸盐侵蚀/影响因素Key words
electrical pulse/cement-based materials/acceleration/sulfate attack/influence factors分类
建筑与水利引用本文复制引用
黄谦,王冲,杨长辉,周立民,殷吉强..电脉冲作用下水泥基材料硫酸盐侵蚀的影响因素[J].东南大学学报（自然科学版）,2014,(5):1041-1045,5.基金项目
重庆市自然科学基金资助项目（cstcjcyja30004）． （）
