摘   要：以加气混凝土（ALC）废渣作为水泥混合材，通过掺加少量缓凝剂葡萄糖酸钠，来改善ALC渣-水泥体系流动性和力学性能，并且使用XRD、TG-DSC、MIP、SEM等来分析硬化体的水化产物和微观结构。结果表明，葡萄糖酸钠可以明显改善体系流动性，在ALC渣掺量为5%的条件下，掺加0.04%葡萄糖酸钠，体系流动度为230cm，达到纯水泥试样性能指标；28d抗压强度为59.9MPa，较不掺加葡萄糖酸钠时略有提高。同时，XRD、TG-DSC与SEM测试表明，掺加葡萄糖酸钠的试样有更多的Ca(OH)2与C-S-H凝胶生成，水化产物间隙减少且相互交接在一起，体系密实性提高；MIP结果显示，葡萄糖酸钠有利于降低体系的孔隙率，改善孔结构。

Abstract: The improvement effect of sodium gluconate on the fluidity and mechanical properties of autoclaved lightweight concrete (ALC) waste-cement system was studied, and the hydration products and microstructure of the hardened cement paste were characterized by XRD, TG-DSC, MIP and SEM. The results show that appropriate content of sodium gluconate can significantly improve the fluidity of the system. When the content of ALC waste is 5%, the fluidity of the system is 230cm by adding 0.04% sodium gluconate, which can meet the performance index of pure cement, and its 28d compressive strength can reach to 59.9MPa, which is higher than that of the samples without sodium gluconate. Meanwhile, the results of XRD, TG-DSC and SEM indicate that much more Ca(OH)2 and C-S-H gel, smaller gap and higher compactness appear in the hydration products of the samples with sodium gluconate. The MIP result shows that sodium gluconate is favorable to reduce the porosity and improve the pore structure of ALC waste-cement system.