电石渣-矿渣复合胶凝材料性能研究

Properties of Carbide Slag-Slag Composite Cementitious Material

电石渣作为一种工业废渣,其碱度较高,综合利用率较低。为了解决过量的电石渣,利用电石渣的强碱性,研究了电石渣对矿渣胶凝体系的碱激发性能。利用电石渣碳化反应可生成碳酸钙的特性,探索了不同碳化制度对电石渣碱激发矿渣胶凝体系的性能影响规律。结果表明:大掺量电石渣对矿渣胶凝材料有很好的碱激发效果,生成大量的C-(A)-S-H凝胶,而复掺粉煤灰和偏高岭土胶凝体系性能最佳;电石渣-矿渣复合胶凝体系经过不同碳化制度处理后,胶凝体系力学性能有效提升;使用CO_(2)气体作为外部碳化源,材料基体表层生成致密结构,基体力学性能提升;使用尿素作为内部碳化源,基体内部碳化均匀,胶凝体系力学性能提升。

Carbide slag(CS),as a kind of industrial waste slag with high alkalinity has low comprehensive utilization rate.In order to solve the problem of excessive carbide slag,the alkali excitation performance of carbide slag on slag cementitious system was studied by using the strong alkaline of carbide slag.Based on the characteristics that carbide slag carbonization reaction generated calcium carbonate,the influences of different carbonization systems on the performance of alkali-activated slag cementitious system were explored.The results show that CS with large dosage has a good alkali-activated effect on the slag cementitious material,and a large amount of C-(A)-S-H gel is generated.The cementitious material with fly ash and metakaolin has best performance.The mechanical properties of carbide slag-slag composite material can be effectively improved after being treated by different carbonation systems.CO_(2) gas using as the external carbonation source leads to dense structure on the surface of material matrix,while urea as internal carbonization source makes the internal carbonation of matrix uniform,which improve mechanical properties of the carbide slag-slag composite cementitious material.