碱激发碳酸盐基灌浆材料的性能与改性

研究了内掺少量复合无机矿粉对碱激发碳酸盐基灌浆材料的强度、抗渗和耐水等性能的改善。结果表明，模拟灌浆砂柱28d抗压强度可提高至3．9～7．3MPa，结石体和模拟灌浆砂柱的抗渗压力则增大至0．7～0．9MPa，同时SiO4^4-、Na^ 溶出量减少。采用差示扫描量热分析(DSC)、扫描电镜分析(SEM)和压汞法(MIP)探讨了无机矿粉对它的改性机理。

Properties and Modification of Alkali-activated-carbonatites Grouting Material

Alkali activated carbonatite is a new type of cementitious material under development for the purpose of reinforcing ground and solidifying sand and soil. But when it is used for waterproof grouting, improvement on its performance is needed. The results of this study show that with the replacement of carbonatites with some inorganic mineral powders, the compressive strength of grouting sand tier is increased to 3.9~7.3 MPa, the resistance to water penetration of calculus and grouting sand tier reaches 0.7~0.9 MPa, at the same time, the leaching of SiO 4- 4 and Na + ions from grouting sand tier is reduced. DSC (differential scanning calorimeter), SEM and MIP (Mercury intrusion porositymetry) studies indicate the reason for the above improvement is mainly attributed to: (1) the textures whether of calculus or of grouting sand tier become more compact due to the physical filling effect of the powders added; (2) more reaction products are formed due to the reaction between the powders and water glass and the facilitation of the reaction between carbonatites and water glass as well.