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采用环氧树脂乳液对硫铝酸盐水泥基水下修补砂浆进行改性,研究了聚灰比对修补砂浆凝结时间、水下分散性和抗折粘结性能的影响,并通过扫描电镜(SEM)观察了环氧树脂乳液改性砂浆的微观结构。结果表明:随着聚灰比的增大,砂浆凝结时间延长;聚灰比为0.1以内时,硫铝酸盐水泥基修补砂浆的水下抗分散性增强、抗折粘结强度大幅度提高,而继续增大聚灰比,抗折粘结强度反而降低。SEM观察表明,环氧树脂可在水泥水化产物和砂粒表面形成连续的聚合物膜,但环氧树脂乳液掺量过大(聚灰比为0.2)时,形成的聚合物膜过厚,反而降低了砂浆与旧基层的粘结性。
The epoxy resin emulsion was used to modify the sulphoaluminate cement-based underwater repair mortar. The effect of poly-ash ratio on the setting time, underwater dispersion and flexural bond resistance of the mortar was studied. SEM, ) Observed the epoxy resin emulsion modified mortar microstructure. The results show that the setting time of mortar increases with the increase of poly-ash ratio. When the ratio of poly-ash is within 0.1, the anti-dispersive property of sulphoaluminate cement-based mortar increases and the flexural- While continuing to increase the poly ash ratio, the flexural bond strength decreases instead. SEM observation shows that the epoxy resin can form a continuous polymer film on the cement hydration products and the sand surface. However, when the epoxy resin emulsion content is too large (poly-ash ratio is 0.2), the formed polymer film is too thick, Reduce the mortar and the old grass-roots adhesion.