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本研究利用废弃混凝土、石料厂下脚料制备了再生细骨料,代替河砂生产砂浆。对胶凝材料和外加剂进行选择和复配,制备了高性能耐腐蚀防水干混砂浆。探讨了胶凝材料体系对砂浆耐腐蚀性能的影响,并采用XRD、SEM对不同胶凝材料体系的水化产物和硬化浆体的物相组成和微观结构进行了表征。研究结果表明:用矿粉和粉煤灰掺合料代替50%水泥,并掺加0.05%引气减水剂、1%憎水剂、8%膨胀剂、0.04%保水剂和0.04%聚丙烯纤维,制备的砂浆28d收缩率为0.06%、抗渗等级达到P15、抗压强度为31.6MPa;在5%浓度的硫酸钠侵蚀液中养护15周,强度比大于1.0,膨胀率只有0.008%。
In this study, waste concrete and stone factory waste were used to produce recycled fine aggregate instead of river sand to produce mortar. The choice of cementitious materials and additives and compound, prepared high-performance corrosion-resistant waterproof dry mortar. The influence of cementitious material system on the corrosion resistance of mortar was discussed. The phase composition and microstructure of hydration products and hardened paste of different cementitious materials were characterized by XRD and SEM. The results show that the mixture of mineral powder and fly ash instead of 50% cement, with 0.05% air entraining agent, 1% water repellent, 8% swelling agent, 0.04% water retaining agent and 0.04% polypropylene Fiber, prepared mortar 28d shrinkage rate of 0.06%, impermeability grade reached P15, compressive strength of 31.6MPa; 5% strength sodium sulfate erosion in the conservation of 15 weeks, the strength ratio greater than 1.0, the expansion rate of only 0.008%.