Title : The use of the rietveld method to study the effect of alite polymorphism on the hydration rate of portland cement
Cement is considered as the most widely used civil engineering material due to various advantages including performance stability, durability, safety, mechanical properties, construction convenience. The main mineral components of Portland cement, is a mixture of four main phases C2S, C3S, C3A, and C4AF, with the remains substantial of alkali sulfates, calcium sulfate, MgO, free CaO, and other minor constituents left over from the clinkering and grinding steps . . the aim of this work is to describe the use of Rietveld analysis to study the effect of alite (C3S) polymorphism on the rate of hydration; two polymorphs were synthesized and characterized (M1 and M3) by what they are most often found in commercial clinkers [2-3].
The pastes were characterized trough different technics 29Si-NMR, TGA-DTA, SEM, LXRPD and finally, define BET area of anhydrous samples. These techniques are most commonly used to determine the chemical structures of anhydrous and hydrated cements components. DRXP analysis in combination with Rietveld refinement is are often used in the cement industry for the quantitative analysis of clinkers and anhydrous cements [1,4-5].
Keywords: Cement, Alite, Hydration, Polymorphism, Rietveld Method, Clinker