激发剂内部参数对碱激发注浆材料性能的影响

采用硅酸钠和氢氧化钠制备碱激发剂,研究了激发剂中SiO₂物质的量浓度和模数对碱激发矿渣注浆材料性能的影响规律。结果表明:碱激发注浆材料流动性主要受激发剂中SiO₂物质的量浓度控制,模数对浆体流动性的影响只有在SiO₂物质的量浓度较高时才有体现;激发剂中SiO₂物质的量浓度和模数都是影响碱激发注浆材料自收缩的关键指标参数,并共同控制碱激发材料的自收缩;当激发剂中SiO₂物质的量浓度大于2 mol/L时,为了保证碱激发注浆材料后期具有足够的抗压强度,则模数不应低于1.2;激发剂中SiO₂物质的量浓度需控制在4 mol/L以下,才能降低对韧性、耐久性的影响。

Effect of Internal Parameters of Activator on Performance of Alkali-Activated Grouting Material

Preparation of alkali activator by sodium silicate and sodium hydroxide, and the influence of the molar concentration of SiO₂ and module in activator on the performance of alkali-activated slag grouting material were studied. The results show that the fluidity of alkali-activated grouting material is mainly controlled by the molar concentration of SiO₂ in the activator, and the influence of module on the fluidity of grouting material is only reflected when the molar concentration of SiO₂ is high. The molar concentration of SiO₂ and module in activator are the key parameters affecting the autogenous shrinkage of alkali-activated grouting material, and jointly control the autogenous shrinkage of alkali-activated grouting material. When the molar concentration of SiO₂ in the activator is greater than 2 mol/L, in order to ensure that the alkali-activated grouting material has sufficient compressive strength at the later stage, the module should not be less than 1.2. The molar concentration of SiO₂ in the activator should be controlled below 4 mol/L to reduce the impact on toughness and durability.