Effects of mineral admixture on the chloride penetration resistance of seawater sea sand concrete
Through the tests of 10 groups of specimens,the effects of 10%to 30%fly ash,10%to 30%slag,and 5%to 15%metakaolin on the chloride penetration resistance and chemical composition of seawater sea sand concrete were studied.The microstructure was analyzed by scanning electron microscope.The results showed that the chloride diffusion coefficient of seawater sea sand concrete first decreased and then increased with the increase of fly ash amount,gradually increased with the increase of slag amount,and gradually decreased with the increase of metakaolin amount.After the addition of fly ash below 20%,metakaolin,and slag to seawater and sea sand concrete,it could be seen that with the increase of the mixture amount,Friedel's salt in the concrete increased,free chloride ion and Ca(OH)2 content decreased,and pH value of concrete pore solution decreased.Metakaolin had the most obvious effect on the change of chemical binding and physical absorption to chloride ion and the improvement of microstructure of seawater sea sand concrete,followed by fly ash with amount of less than 20%.
万方数据
维普
