氢氧化钾-硅酸钠溶液对碱矿渣水泥水化行为的影响

固定水灰比为0.35,研究了氢氧化钾-水玻璃复合碱组分作用下碱矿渣水泥的凝结时间和抗压强度的变化规律。通过水化放热实验研究了4%碱当量不同模数的复合碱组分作用下碱矿渣水泥的水化动力学过程。结果表明：以氢氧化钾-水玻璃复合作为碱组分的碱矿渣水泥,低水玻璃模数条件下,溶液中氢氧根离子浓度高,矿渣溶解速度快,水化放热增长迅速,凝结时间短,强度高；高模数条件下,溶液粘度高,氢氧根离子浓度低,凝结时间长,强度较低；对比而言,溶液模数为1.5时,碱矿渣水泥的综合性能最佳。

Effect of potassium Hydroxide-Sodium Silicate Activator on the Hydration of Alkali Activated Slag Cement

In this paper, the variation of the setting time and compressive strength of alkaline slag cement with W/C=0.35 and potassium hydroxide-water glass solution as activator were studied.The hydration kinetics of alkali activated slag cement (AAS) under the action of the composite alkaline components of different modulus under 4% (Na2O+K2O concentration by mass of slag) was investigated by hydration experiments. Results show that AAS activated by potassium hydroxide-water glass has high hydroxide ion concentration in the solution under the condition of low water glass modulus. The dissolution rate of slag is fast and the heat release from hydration increases rapidly. Short setting time and high compressive strength. Under high modulus, the solution has high viscosity, low hydroxide ion concentration, long setting time, and low compressive strength. In contrast, when the modulus is 1.5, AAS has the best combination property.