Chloride ion penetration into concrete under hydraulic pressure
来源期刊：中南大学学报(英文版)2013年第12期
论文作者：JIN Zu-quan(金祖权) ZHAO Tie-jun(赵铁军) GAO Song(高嵩) HOU Bao-rong(侯保荣)
文章页码：3723 - 3728
Key words：hydraulic pressure; concrete; chloride ion; water penetration; chloride transportation coefficient; chloride binding capability
Abstract: 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.
JIN Zu-quan(金祖权)1, ZHAO Tie-jun(赵铁军)1, GAO Song(高嵩)1, HOU Bao-rong(侯保荣)2
(1. College of Civil Engineering, Qingdao Technological University, Qingdao 266033, China;
2. Institute of Oceanology, The Chinese Academy of Science, Qingdao 266071, China)
Abstract: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.
Key words:hydraulic pressure; concrete; chloride ion; water penetration; chloride transportation coefficient; chloride binding capability
