CAJ | 학술논문

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。
이가기혼응토(ALC)폐사작위수니혼합재,통과참가소량완응제포도당산납,래개선ALC사-수니체계류동성화역학성능,병차사용XRD、TG- DSC、MIP、SEM등래분석경화체적수화산물화미관결구。결과표명,포도당산납가이명현개선체계류동성,재ALC사참량위5%적조건하,참가0.04%포도당산납,체계류동도위230cm,체도순수니시양성능지표；28d항압강도위59.9MPa,교불참가포도당산납시략유제고。동시,XRD、TG- DSC여SEM측시표명,참가포도당산납적시양유경다적Ca(OH)2여C- S- H응효생성,수화산물간극감소차상호교접재일기,체계밀실성제고；MIP결과현시,포도당산납유리우강저체계적공극솔,개선공결구。
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 hard-ened cement paste were characterized by XRD, TG-DSC, MIP and SEM. The results show that appropriate content of sodi-um 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 compact-ness 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.