矿用喷射混凝土外加剂机理分析

The mechanism analysis of shotcrete concrete additive used in coal mines

通过对锚喷回弹和产尘机理研究,研制了具有减尘和降回弹效果的矿用喷射混凝土外加剂.该外加剂可以提高锚喷物料的润湿性和黏性,降低反应过程中的pH值;扫描电镜表明,掺入该外加剂后,水泥试块微观结构良好.红外光谱分析表明,加入该外加剂改善了水泥水化过程中的物理化学性能,有助于水泥C-S-H凝胶的形成.该外加剂中蒙脱土和高分子聚合物组份在改善锚喷物料的强度和黏性方面效果显著.

Through the research on the mechanism of rebounds and dust producted in shotcrete, a kind of concrete additive was developed which can solve problems to a certain extent. The concrete additive can improve the wetting, viscosity and decrease the pH of shotcrete material. The results by SEM indicate that the material has good microstructure. The results by infrared spectroscopy show that adding the concrete additive improves the physical and chemical characteristic in cement hydration process are helpful to the formation of C - S - H gel. The montmorillonite and polymer consisted in the additive show significant effects in improving the strength and viscosity of shotcrete material.