摘要
将矿粉掺量0%~65%、粉煤灰掺量0%~30%混凝土置于海洋大气区、潮汐区2年,研究海洋不同区域、矿粉掺量、粉煤灰掺量对混凝土中氯离子渗透规律的影响。结果表明：混凝土在海洋环境下暴露2年,氯离子质量分数随着渗透深度的增加而减小,最后趋于稳定;海洋潮汐区腐蚀混凝土氯离子传输受扩散机制控制,而大气区腐蚀混凝土受到扩散和毛细吸附双重机制控制。随着腐蚀龄期的增加,混凝土中氯离子侵蚀深度增加,表面层氯离子浓度线性增加。潮汐区腐蚀混凝土的氯离子浓度高于大气区腐蚀混凝土,但其表观氯离子扩散系数小于大气区腐蚀混凝土。粉煤灰和矿粉掺量对于混凝土的抗氯离子渗透能力而言,其最优值分别为15%、30%。
Concretes with 0% ~ 65% slag and 0% ~ 30% fly ash were placed in atmospheric zone and tidal zone of marine environment for 2 years. The influence of marine zone,GGBS and fly ash replacement ratio on chloride ion penetration into concrete was studied. The experimental results showed that the chloride ion concentration decreased with increasing depth of concrete,finally tended to be stable. The transmission mechanism of chloride ion into concrete exposed to marine tidal zone is controlled by diffusion. The chloride penetrated into concrete in the atmospheric zone is complexly controlled by diffusion and capillary adsorption. With the increase of corrosion age,the penetration depth of chloride ions increases,and the chloride ion concentration on the surface increases linearly. The chloride ion concentration of concrete exposed to tidal zone is higher than that of concrete to atmospheric zone. But the apparent chloride diffusion coefficient order is the atmospheric zone’s 〉 the tidal zone’s. For the resistance capacity to chloride ion penetration of concrete,the optimized replacement ratio of fly ash and slag is 15% and 30%,respectively.
出处
《海洋工程》
CSCD
北大核心
2015年第5期60-65,共6页
The Ocean Engineering
基金
国家自然科学基金资助项目(51178230
51378269)
青岛市科技项目资助课题(13-1-4-176-jch
13-1-4-115-jch)
