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Crystal Structure and Hydration Characteristics of Tricalcium Silicate

陈琳  
【摘要】:The research investigates various methods to identify magnesium oxide influences on the crystal structure and hydration properties of tricalcium silicate.The f-CaO content of the clinkers were analyzed by chemical analysis.The complex disordered superstructure of the tricalcium silicate has been studied by a joint X-ray diffraction (XRD),nuclear magnetic resonance(NMR) and transmission electron microscope(TEM).The results show that MgO exerts a remarkable influence on the polymorphisms of C 3 S.Mg is not only substitutional atom but also interstitial atom in the crystal lattice of tricalcium silicate.The HRTEM pattern of C 3 S doped with MgO is covered by the various irregular lattice.The addition of appropriate amount of MgO in raw meal can change the formation kinetic of C 3 S,slightly perturb the environment of SiO 4 4tetrahedral,modify the crystal structure of C 3 S and affect the hydration activity.Doped with MgO in the raw meal can slow down the hydration rate of alite slightly in early stage.

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