Research on the Mechanical Properties and Salt-Freezing Resistance of Nano-Silica Modified MPC
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摘要: 采用纳米二氧化硅(NS)对磷酸镁水泥(MPC)进行改性,通过抗压、抗折强度试验以及凝结时间试验,提出一组性能优异的配合比,并分析改性MPC试件的微观结构、物相组成。为进一步探究NS对MPC抗盐冻性能的影响,测试了冻融后改性MPC的抗压、抗折强度和质量损失。结果表明:NS可以有效提高MPC抗压和抗折强度,掺入2%NS效果最好,早期强度提高尤为明显;NS可以增强MPC的抗盐冻性能,减少质量损失和强度的下降。由微观分析可以看出,NS介入了MPC的水化过程,填补了MPC样品内部的空隙,从而增强了样品的密实度。Abstract: Magnesium phosphate cement ( MPC ) was modified by nano-silica ( NS ). A set of mix proportions with excellent performance was proposed by compressive strength tests, flexural strength tests and setting time tests, and the microstructure and phase composition of modified MPC specimens were analyzed. The effects of NS on the salt-freezing resistance of MPC were further explored, and the compressive strength, flexural strength and mass loss of modified MPC after being subjected to freeze-thaw cycles were tested. The results showed that NS could effectively improve the compressive and flexural strength of MPC, and the effect of adding 2% NS was the best, especially the early strength. NS could enhance the salt-freezing resistance of MPC, reduce the mass loss and the strength reduction. It could be seen from the microscopic analysis that NS intervened in the hydration process of MPC, filling the voids inside the MPC sample, thereby enhancing the compactness of the sample.
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Key words:
- nano-silica /
- magnesium phosphate cement /
- strength /
- salt-freezing resistance
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