Study on hydration mechanism of sulphate aluminium cement
The feasibility of sulphate aluminum cement (SAC) utilization in support mortar was studied.Setting time and strength of as-received sul phate aluminum cement (SAC) paste were examined, hydration kinetics behavior was determined through Isothermal Calorimeter, and hydration mechanism were characterized by X-ray diffraction analysis (XRD) and field emission scanning electron microscopy analysis (FSEM).Results showed, as-received SAC contained 61% of anhydrous calcium sulfate (3CA· CaSO4) and dicalcium silicate (C2S).The strength at 1 day or 3 days grew to 68.6% or 85.7% of that at 28days respectively, while most of hydration heat was released within 1 day.The emergency of three exo thermic peaks at acceleration stage was found and hydration kinetics model was established choosing the terminal time of the first exothermic peak at accelerating stage as the beginning of accelerating stage.XRD analysis suggested that large amount of ettringite (AFt) was produced at early age and FSEM observation revealed that ettringite (AFt) formed in sulphate a luminum cement (SAC) paste was characterized of different morphology which was proved to be caused by different ion concentrations.
Sulphate aluminium cement Ettringite Hydration kinetics Hydration mechanism
Zhen He Huamei Yang Meiyan Liu
State Key Laboratory of Water Resources &-Hydropower Engineering Science,Wuhan University ,Wuhan 430072,China
国际会议
武汉
英文
385-395
2013-10-23（万方平台首次上网日期，不代表论文的发表时间）