摘要
为了提高钢渣的胶凝活性及其在胶凝材料中的掺量,研究了不同单一助磨剂和复合助磨剂对粉磨产品的比表面积、筛余量、粒度分布的影响,以及对钢渣基胶凝材料试件抗折抗压强度的影响,采用X射线衍射、扫描电镜和热重分析等手段探究了钢渣基胶凝材料试件的水化机理.结果表明:单一助磨剂对钢渣的助磨效果以及对钢渣基胶凝材料试件的抗折强度和抗压强度的提高幅度由强到弱顺序为三乙醇胺、1,2-丙二醇、乙二醇、丙三醇、硫酸钠;添加复配的复合助磨剂S2(三乙醇胺、乙二醇、1,2-丙二醇的质量比为 5∶7∶7)粉磨 60 min的粉磨产品比表面积为 495 m2/kg,+45 μm、+80 μm粒级产率分别为 8.7%、0.8%;养护 3 d和 28 d试件的抗压强度比未添加助磨剂情况下分别提升 53.10%、36.70%;助磨剂的添加使钢渣基胶凝材料试件的水化产物增多,水化程度进一步完全,添加S2 使钢渣基胶凝材料试件的水化产物Ca(OH)2 增多,微观形貌更致密、表面孔洞数量少,结构间空隙小,提高了钢渣基胶凝材料的强度.
Abstract
In order to improve the cementitious reactivity and the addition of steel slag in cementitious materials,the effects of different single and composite grinding aids on surface area,sieve residue,size distribution of grinding products,the flexural strength and the compressive strength of steel-slag-based cementitious materials were studied.The hydration mechanism of steel-slag-based cementitious materials was analyzed by X-ray diffraction,scanning electron microscopy and thermogravimet-ric analysis.The results showed that the grinding effect of single grinding aid on steel slag and the increase of flexural strength and compressive strength of steel slag-based cementitious material specimens from strong to weak are as follows:triethano-lamine,1,2-propylene glycol,ethylene glycol,glycerol and sodium sulfate.The surface area of grinding products which grinding for 60 minutes and adding S2(the mass ratio of triethanolamine,ethylene glycol and 1,2-propanediol is 5∶7∶7)is 495 m2/kg.The fraction yield of+45 μm and+80 μm is 8.7%and 0.8%,respectively.Compared to the cementitious materials without adding grinding aids,the compressive strength of cementitious materials which curing 3 days and 28 days were in-creased by 53.10%and 36.70%,respectively.The hydration products and the hydration degree of steel-slag-based cementi-tious materials were raised by the addition of grinding aids.The hydration product Ca(OH)2 were raised by the addition of S2,the microscopic structure were more compacted,the surface pores were reduced,the structural voids were decreased,the strength of steel-slag-based cementitious materials were increased.
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