The Influence of Acidic Oxygen Containing Groups Located on the Surface of Graphene Oxide (GO) on the Carbonation of Tricalcium Silicate (C3S) Based on Boehm's‐Theorem

Abstract

AbstractIn various cementitious materials, the carbonation of tricalcium silicate (C3S) by the acidic oxygen‐containing groups located on the surface of graphene oxide (GO) can support cutting down the CO2 emissions, in addition to the formation of different crystalline CaCO3. The current work investigates the direct chemical reaction of dry‐C3S with 0.4 % GO solution and the mechanism of CH and CSH carbonation depending on the concept of Boehme's‐theorem. FTIR‐spectroscopy has been utilized to demonstrate and identify the effective transitions in the formulation of portlandite (Ca(OH)2), calcium‐silicate‐hydrate (CaO ⋅ SiO2 ⋅ H2O), and calcium carbonate (CaCO3) polymorphs during the reaction. This paper clarifies the relationship between XRD peak intensity and morphologies of CaCO3 crystals resulting from using various weights of dry‐C3S. Thus, the XRD peak intensity of CaCO3 varies according to their morphologies. XRD‐Rietveld Refinement has examined the quantity percentages of the crystalline phases. The differences in the dissociation temperature (TGA) illustrate the possible variation in the structure and properties of CaCO3 crystals formed during the carbonation of CH and CSH. SEM with different magnifications was selected to observe the prevalent morphology of vaterite, aragonite, and calcite crystalline phases during the transformation process.