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Chloride ion penetration into concrete under hydraulic pressure 被引量:6

Chloride ion penetration into concrete under hydraulic pressure
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摘要 The lining concrete of subsea tunnel services under combined hydraulic pressure, mechanical and environmental loads. The chloride ion and water penetrations into concrete under hydraulic pressure were investigated. The experimental results indicate that the water penetration depth, chloride ion transportation depth, and the concentration of chloride ion ingression into concrete increase with raised hydraulic pressure and hold press period. But the chloride ion transportation velocity is only 53% of that of water when concrete specimens are under hydraulic pressure. The chloride transportation coefficient of concrete decreases with hold press period as power function. And that would increase 500% 600% in chloride transportation coefficient when the hydraulic pressure increases from 0 to 1.2 MPa. The hydraulic pressure also decreases the bound chloride ion of concrete to about zero. Besides, the low water-cementitions materials and suitable content of mineral admixture(including fly ash and slag) improve the resistance capacity of chloride penetration, and binding capacity of concrete under hydraulic pressure. The lining concrete of subsea tunnel services under combined hydraulic pressure, mechanical and environmental loads. The chloride ion and water penetrations into concrete under hydraulic pressure were investigated. The experimental results indicate that the water penetration depth, chloride ion transportation depth, and the concentration of chloride ion ingression into concrete increase with raised hydraulic pressure and hold press period. But the chloride ion transportation velocity is only 53% of that of water when concrete specimens are under hydraulic pressure. The chloride transportation coefficient of concrete decreases with hold press period as power function. And that would increase 500%-600% in chloride transportation coefficient when the hydraulic pressure increases from 0 to 1.2 MPa. The hydraulic pressure also decreases the bound chloride ion of concrete to about zero. Besides, the low water-cementitions materials and suitable content of mineral admixture (including fly ash and slag) improve the resistance capacity of chloride penetration, and binding capacity of concrete under hydraulic pressure.
出处 《Journal of Central South University》 SCIE EI CAS 2013年第12期3723-3728,共6页 中南大学学报(英文版)
基金 Projects(50708046,51178230)supported by the National Natural Science Foundation of China Project(2009CB623203)supported by the National Basic Research Program(973 Program)of China Project(2010CEM006)supported by State Key Lab of High Performance Civil Engineering Materials,China
关键词 hydraulic pressure CONCRETE chloride ion water penetration chloride transportation coefficient chloride bindingcapability 氯离子渗透 衬砌混凝土 液压 运输系数 混凝土试件 矿物掺合料 水渗透 高水压
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