硫酸盐环境下水玻璃对磷酸钾镁水泥浆体力学的影响

Effect of sodium silicate in sulfate environment on the mechanics of potassium magnesium phosphate cement slurry

为研究硫酸盐环境下水玻璃对磷酸钾镁水泥(MKPC)浆体力学的影响,该文测试MKPC浆体在5%硫酸钠溶液中干湿循环30~180次后的强度和吸水率,并与MKPC浆体浸泡在5%硫酸钠溶液中的强度及吸水率进行对比。结果表明:MKPC浆体经过180次硫酸盐干湿循环和90 d长期浸泡试验后,其强度相比初始值分别提高16.79%、38.13%,且吸水率远低于初始值,体现MKPC浆体优异的抗硫酸盐腐蚀能力;加入适量的水玻璃后,MKPC浆体的强度得到了提高,同时耐硫酸盐腐蚀能力也得到改善。

In order to study the effect of sodium silicate on the mechanical properties of magnesium phosphate cement(MKPC)slurry in sulfate environment.In this paper,the strength and water absorption of MKPC slurry after drying and wetting for 30 to 180 times in 5%sodium sulfate solution were tested.The strength and water absorption of MKPC slurry soaked in 5%sodium sulfate solution were compared.The results showed that the strength of MKPC slurry increased by 16.79%and 38.13%compared with the initial value after 180 cycles of sulfate drying and wetting and 90 days of long-term immersion test,respectively,and the water absorption rate was much lower than the initial value,which showed that MKPC slurry had excellent sulfate corrosion resistance.With the addition of sodium silicate,the strength of MKPC slurry was improved and the sulfate corrosion resistance was also improved.