碱金属阳离子对硅酸盐溶液激发的碱矿渣水泥浆体黏度的影响

Effect of Alkali Metal Cations on Viscosity of Alkali Activated Slag Paste Excited by Silicate Solution

分别研究了不同碱金属阳离子与硅酸根质量比(M/Si)的钠、钠钾复合硅酸盐溶液,和由硅酸盐溶液激发的碱矿渣水泥浆体的黏度和凝结时间。结合硅酸盐溶液的傅里叶红外光谱试验,对溶液中硅酸根离子的聚合度进行了研究。结果表明:硅酸盐溶液的M/Si越低,硅酸根的聚合度越小。在硅酸钠溶液体系中掺入一定量的K^+可以降低体系中硅酸根离子的聚合度,显著降低溶液和浆体的黏度,提高碱矿渣水泥的工作性能。同时,在较低M/Si(M/Si≤1.5)情况下,K^+的加入还能够延长碱矿渣水泥的初凝时间。

The composite silicate solutions of sodium and sodium-potassium with different mass ratio of silicates to alkali metal cations(M/Si)were studied.The viscosity and setting time of alkali-activated slag paste excited by silicate solution were also studied.The polymerization degree of silicate ions in silicate solution was determined by FTIR(Fourier transform infrared)method.Results show that the lower M/Si of silicate solution was,the smaller polymerization degree of silicate was.Adding a certain amount of K^+ion into the sodium silicate solution system could reduce the polymerization degree of the silicate ion in the system,significantly lower the viscosity of the solution and slurry,and improve the performance of the alkali-activated slag.At the same time,under the condition of low M/Si(≤1.5),the addition of K^+ions could also prolong the initial setting time of alkali-activated slag.