矿物掺合料对全机制砂灌浆料的影响研究

Study on the Effect of Mineral Admixture on Full-mechanism Sand Grouting Material

试验采用普通硅酸盐水泥与快硬硫铝酸盐水泥的复合胶凝体系,选用石灰石机制砂作为细集料,制备全机制砂灌浆料。选用硅灰、粉煤灰与石粉作为矿物掺合料,研究矿物掺合料对全机制砂灌浆料流动度、抗压强度与竖向膨胀率的影响,并利用SEM电镜对全机制砂灌浆料进行微观机理分析。研究结果表明:矿物掺合料复掺有利于提高灌浆料的流动性能与力学性能,改善灌浆料的界面过渡区,通过正交试验优化机制砂灌浆料配方,得到的最优矿物掺合料掺量为硅灰5%、粉煤灰6%、矿粉8%。

The experiment utilized a composite cementitious system comprising ordinary Portland cement and fast-hardening sulfoaluminate cement,with crushed limestone serving as the fine aggregate.A full machine-made sand grout was prepared using this system.Silica fume,fly ash,and stone powder were employed as mineral admixtures to investigate their impact on the flowability,compressive strength,and vertical expansion rate of the full machine-made sand grout.Additionally,SEM electron microscopy was used to analyze the microscopic mechanisms of the full machine-made sand grout.Research findings indicate that the concurrent use of mineral admixtures is advantageous in enhancing both the flowability and mechanical properties of the grout while also improving the transition zone between the grout and aggregate.The optimal dosage of mineral admixtures obtained through orthogonal experimentation is 5%silica fume,6%fly ash,and 8%slag.