高碳铬铁合金渣用于C40混凝土试验研究

Experimental study of high carbon ferrochrome slag used in C40 concrete

以高碳铬铁合金渣作为粗细集料来配制C40混凝土,通过对含高碳铬铁合金渣混凝土抗压强度、抗氯离子渗透性能和抗碳化性能等进行试验研究,对六价铬离子Cr(VI)在水泥混凝土中固化效果进行了评价。结果表明:高碳铬铁渣骨料混凝土养护28 d的抗压强度高于普通C40碎石混凝土。由于高碳铬渣的表面多孔和较高的孔隙率,导致用高碳铬渣制备的混凝土抗氯离子渗透性能和抗碳化性能优于对照组,而混凝土浸泡90 d的铬离子表面浸出浓度低于标准规定铬离子0.05 mg/L的临界允许浓度,从应用和环境的角度初步说明高碳铬铁合金渣作为骨料配制C40混凝土基本可行。

In this paper the high carbon ferrochrome slag used as coarse and fine aggregate in the preparation of C40 concrete was carried out.The compressive strength and carbonization resistance of concrete containing high carbon ferrochrome slag weree investigated and the solidification effect of hexavalent chromium ion in cement concrete was evaluated.The results indicate that the compressive strength of concrete with high carbon ferrochrome slag at 28 days is slight higher than the ordinary C40 concrete.The resulted concrete with incorporation of high carbon ferrochrome slag is superior to the reference concrete regarding the resistance to chloride penetration and carbonization due to its surface porosity and high porosity.Whereas,the surface leaching concentration of concrete incorporating high carbon ferrochrome slag is relatively low and less than the critical value of 0.05 mg/L.From the perspective of application and environment,it can indicate that the preparation of C40 concrete with high carbon ferrochrome slag as aggregate is feasible.