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硅酸盐水泥-铝酸盐水泥-石膏三元体系具备明显的快硬、快凝、补偿收缩的性能,在该体系中掺入粉煤灰可以部分取代水泥降低成本,改善三元体系的工作性能,满足不同修复工程的需要.研究了不同掺量粉煤灰对三元体系的水化历程的影响,测试了浆体流动度、凝结时间以及硬化砂浆的强度和体积变形性能,并用X-射线衍射分析(XRD)对微观结构进行分析.结果表明:粉煤灰可以提高三元体系的流动性,并且延长其经时损失,当掺量大于20%时,三元体系的凝结时间明显延长.随着粉煤灰掺量的增加,硬化砂浆的强度降低,早期体积膨胀率减小但后期不收缩.综合考虑,粉煤灰的掺量控制在20%~30%,可以满足实际工程的需要.
Portland cement - aluminate cement - gypsum ternary system with significant fast hardening, fast setting, compensation shrinkage performance, the system incorporates fly ash can partially replace the cement to reduce costs and improve the ternary system work Performance, to meet the needs of different repair projects.Studied the impact of different content of fly ash on the hydration process of the ternary system, the fluidity of the slurry, the setting time and the strength and volume deformation properties of the hardened mortar were tested, and the X- Ray diffraction (XRD) analysis of the microstructure.The results show that: fly ash can improve the liquidity of the ternary system, and prolong the loss of time, when the content is greater than 20%, the ternary system of the condensation time was significantly longer With the increase of fly ash content, the strength of hardened mortar decreased, the early volume expansion rate decreased but the latter did not shrink.Considering the content of fly ash is controlled at 20% ~ 30%, which can meet the needs of practical engineering need.