摘要
深海区的水泥基材料在受到水压力和氯离子浓度梯度的双重作用时,可能产生与一般环境下的氯离子不一样的渗透规律。以水泥砂浆试块作为研究对象,利用基于COMSOL软件的仿真技术以及相应的物理实验分析了静水压力场-氯离子浓度场耦合作用下水泥基材料中氯离子传输机制。研究结果表明:静水压力作用下氯离子传输深度受试块水灰比变化影响巨大,它随着水泥基材料水灰比的增加而快速增加;当静水压力为0.5 MPa时,随着砂浆试块水灰比由0.35增加到0.45和0.55,氯离子传输深度分别增长了28.1%和52.9%;在不同静水压力的作用下相同水灰比砂浆试块氯离子传输深度也有非常明显的变化,其中当砂浆试块水灰比为0.35时,随着静水压力由0 MPa增长到0.5 MPa和1.0 MPa,30 d的氯离子最终传输深度分别增大了43.1%和123.6%。
Cement-based materials in deep sea area are subjected to the double effects of water pressure and chloride ion concentration gradient, which may result in different transmission law of chloride ions in deep sea area with in the general environment. Taking the cement mortar test block as the research object, the transmission mechanism of chloride ion in cement-based materials under the coupling effects of hydrostatic pressure field and chloride concentration field was verified by the simulation technology based on COMSOL software and the corresponding physical experiments. The results showed that the penetration depth of chloride ion is greatly affected by the change of water-cement ratio under hydrostatic pressure, and it increases rapidly with the increase of water-cement ratio of cement-based materials. At the hydrostatic pressure of 0.5 MPa, the penetration depth of chloride ion increased by 28.1% and 52.9% respectively when the water-cement ratio of mortar test block increased from 0.35 to 0.45 and 0.55. The penetration depth of chloride ion in mortar test block with the same water-cement ratio changes obviously under different hydrostatic pressure. When the water-cement ratio of mortar test block was 0.35, with the hydrostatic pressure increasing from 0 to 0.5 MPa and 1.0 MPa, the ultimate penetration depth of chloride ion increased by 43.1% and 123.6% respectively at the age of 30 days.
作者
张明
谭琼
曾宪梅
兰中佑
ZHANG Ming;TAN Qiong;ZENG Xianmei;LAN Zhongyou(Sichuan Research Institute of Building Materials,Chengdu 610081,China;Sichuan Quality Supervision and Inspection Center for Building Material Product,Chengdu 610081,China)
出处
《人民长江》
北大核心
2019年第5期151-155,共5页
Yangtze River
关键词
氯离子
传输深度
COMSOL
水泥基材料
压力-浓度耦合作用
chloride ion
penetration depth
COMSOL
Cement-based materials
coupling effects of pressure and concentration
