关键词: 碱式硫酸镁水泥混凝土;外加剂;粉煤灰;抗硫酸盐腐蚀

Abstract: Basic magnesium sulfate cement concrete were prepared by using basic Magnesium Sulfate cement with different dosages of admixture and fly ash.The effect of admixture and fly ash on the compressive strength of BMSC concrete and the resistance to sulfate corrosion were studied, and the phase composition and microstructure of BMSC concrete were also analyzed.The results show that after adding admixture the strength of the concrete was greatly enhanced.When the dosage of admixture is 0.5% of the quality of cement, the strength of the concrete reaches maximum value.Continue to increase the amount of admixture, the strength of concrete has little effect.The strength of concrete is decreased after adding fly ash.And when the water cement ratio is constant, the more fly ash content, the more unfavorable to the strength of concrete.After adding admixture and fly ash, the resistance to sulfate corrosion of concrete has been improved obviously.And under the same condition, the resistance to sulfate corrosion of the basic Magnesium Sulfate cement is better than that of ordinary portland cement concrete.

Key words: basic magnesium sulfate cement concrete;admixture;fly ash;resistance to sulfate corrosion