硅烷基聚合物防水粉末对早强砂浆性能影响的试验研究

Experimental Research on Effect of Silane-based Polymer Powder on Properties of Early-strength Mortar

通过试验,研究了硅烷基聚合物防水粉末掺量对早强砂浆的流动性能、抗压强度、抗折强度、吸水性能及抗氯离子渗透性能的影响规律。早强砂浆是由普通硅酸盐水泥、硫铝酸盐水泥和石膏为胶凝材料制备而成,硅烷基聚合物防水粉末是由γ-氨丙基三乙氧基硅烷、聚乙烯醇和异丁基三乙氧基硅烷为主要原料制成。试验结果表明:硅烷基聚合物防水粉末掺量3.0%以内时,早强砂浆流动度和经时流动度损失符合规范要求;掺量为3.0%时,28 d龄期的早强砂浆试件吸水率最大降低58.9%,抗压强度和抗折强度未降低,抗氯离子渗透性能提高44.6%。

The effect of silane-based polymer powder content on the flow properties,compressive strength,flexural strength,water absorption and chloride ion resistance of early-strength mortar were studied through experiments.Early-strength mortar was prepared from ordinary Portland cement,sulfoaluminate cement and gypsum as binding materials.The main raw materials of the silane-based polymer powder wereγ-aminopropyltriethoxysilane,polyvinyl alcohol and isobutyltriethoxysilane.The results showed that when the content of silane-based polymer powder was within 3.0%,the fluidity and loss of fluidity of early-strength mortar met the requirements of the specification.When the dosage was 3.0%,the water absorption rate of the 28d-aged early-strength mortar specimens decreased by 58.9%,the compressive strength and flexural strength were not reduced,and the resistance to chloride ion penetration increased by 44.6%.