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为了研究磷酸钠-水玻璃碱矿渣水泥的水化行为,测试了该碱矿渣水泥的凝结时间、坍落扩展度和抗压强度.采用微量热仪测试了碱矿渣水泥的水化放热行为,并分析了其水化动力学规律.采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析了碱矿渣水泥早期水化产物及微观结构,探讨了磷酸钠-水玻璃对碱矿渣水泥水化行为的影响机理.结果表明:当磷酸钠掺量低于20%(质量分数)时,碱矿渣水泥表现为缓凝,其早期水化过程受致密扩散控制,反应速率随水化反应的进行而加快;当磷酸钠掺量高于80%时,碱矿渣水泥表现为促凝.磷酸钠-水玻璃碱矿渣水泥早期水化产物中无Ca_3(PO_4)_2晶体生成,Ca_3(PO_4)_2不是导致碱矿渣水泥缓凝的因素.
In order to study the hydration behavior of sodium phosphate-sodium silicate slag cement, the setting time, slump expansion and compressive strength of the alkali slag cement were tested.The hydration exothermic behavior of alkali slag cement was tested by microcalorimeter, The hydration kinetics of the alkali slag cement was analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of sodium phosphate-water glass on the alkali slag cement water The results show that when the content of sodium phosphate is less than 20% (mass fraction), the alkali slag cement behaves as retardation, the early hydration process is controlled by the dense diffusion, and the reaction rate changes with the hydration reaction But when the content of sodium phosphate is more than 80%, the alkaline slag cement shows procoagulant.No Ca_3 (PO_4) _2 crystal is formed in the early hydration products of sodium phosphate-sodium silicate slag cement, while Ca_3 (PO_4) _2 is not Factors that cause the retarding of alkali slag cement.