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STUDY ON DAMAGE OF HPC UNDER THE CORROSION OF CHLORIDE AND SULFATE
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摘要: 通过35%NaCl溶液,5%Na2SO4溶液以及35%NaCl+5%Na2SO4复合溶液的浸泡腐蚀试验,研究了C30、C50两种强度等级,三种大掺量矿物掺合料混凝土在腐蚀溶液中的自由氯离子扩散规律,以及基于相对动弹性模量变化的损伤规律。结果表明:复合腐蚀下,C30的自由氯离子含量是C50的2倍左右;氯离子扩散系数为C50的1.7～1.95倍;混凝土相对动弹性模量先上升后下降。矿物掺合料提高了混凝土抗氯离子渗透和抗硫酸盐损伤能力,硫酸盐降低了混凝土抗氯离子腐蚀能力,氯盐减缓了硫酸盐对混凝土的损伤速度。Abstract: Based on taking corrosion test of concrete immersed in 3.5% weight of NaCl,5% weight of Na2SO4 and compound solutions(3.5% NaCl+5%Na2SO4),it has been studied that the free chloride di ffusion and mechanical damage,based on relative Youngs modulus,of concrete tha t include two grades of strength and three types of mineral admixture.The results suggest that the free chloride content of C30 should be 2 times that of C50,and fr ee chloride diffusion coefficients be 1.7～1.95 times.Moreover,the mineral adm ixtures may improve chloride and sulfate ion resistance capacity of conc rete,and the sulfate decreases chloride resistance capacity of concrete,as well as the chloride decreases the sulfates damage speed of concrete.
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Key words:
- concrete /
- sulfate /
- chloride /
- relative Young's mo dulus
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