粉煤灰及沙漠砂对混凝土抗氯离子渗透性能影响

Influence of fly ash and desert sand on the chloride permeability of concrete

通过进行单掺粉煤灰、单掺沙漠砂、双掺粉煤灰和沙漠砂混凝土抗压强度、电通量和RCM试验,揭示沙漠砂替代率和粉煤灰掺量对沙漠砂混凝土抗氯离子渗透性能和抗压强度的影响规律,分析电通量和氯离子扩散系数的相关性。研究表明:单掺粉煤灰混凝土抗氯离子渗透性能随着粉煤灰掺量增加而增强;单掺沙漠砂混凝土抗氯离子渗透性能随着沙漠砂替代率增加呈先增强后减弱趋势,沙漠砂替代率60%时混凝土抗氯离子渗透性能最好;粉煤灰掺量30%、沙漠砂替代率60%时,双掺粉煤灰和沙漠砂混凝土抗氯离子渗透性能最好;电通量和氯离子扩散系数相关性良好。

Tests on the compressive strength,electrical capacity and RCM method of concrete with single fly ash,single desert sand,double fly ash and desert sand concrete were carried out.The effect of fly ash content and desert sand replacement rate on the compressive strength and resistance to chloride ion of concrete was revealed and the correlation between the value of electric flux and the diffusion coefficient was analyzed.Experimental results show that for concrete with single fly ash,the resistance to chloride ion of concrete enhances with the increase of fly ash content.For single desert sand concrete,with the increase of desert sand replacement rate,the performance of resistance to chloride ion of concrete increases firstly,and then decreases.When desert sand replacement rate is 60%,the performance of concrete resistance to chloride ion reaches the minimum value.For double fly ash and desert sand concrete,the performance of concrete resistance to chloride ion reaches the minimum value when fly ash and desert sand replacement rate amount to 30% and 60% respectively.The regression analysis shows that the flux value is in agreement with the chloride diffusion coefficient.