Physical and Chemical Properties of Cement Mortar with Gamma-C2S

Abstract

Presently, for the cement industry, studies that seek to reduce CO₂, because of the development of the plastic industry and demand for reduction of energy use, have been actively conducted among them, studies attempting to use Gamma-C₂S(γ-C₂S) to fix CO₂ have been actively conducted. The γ-C₂S compound has an important function in reacting to CO₂ and stiffening through carbonatization in the air. The γ-C₂S compound, reacting to CO₂ in the air, generates CaCO₂ within the pore structure of cement materials and densifies the pore structure this leads to an improvement of the durability and to the characteristic of resistance against neutralization. Therefore, in this experiment, in order to synthesize γ-C₂S, limestone sludge and waste foundry sands are used these materials are plasticized for 30 or 60 minutes at 1450°C, and are prevented from being cooled in the temperature range of 30 ~ 1000oC when they are about to be cooled. XRD analysis and XRF analysis are used to determine the effects of this process on γ-C₂S synthesization, the temperature at which a thing is plasticized, and the conditions for cooling that obtain in the plasticized clinker also, in order to confirm the CO₂ capture function, analysis of the major hydration products is conducted through an analysis of carbonatization depth and compressive strength, and through MIP analysis and XRD Rietveld analysis. As a result of these analyses, it is found that when γ-C₂S was synthesized, the clinker that was plasticized at 1450°C for one hour demonstrated the highest yield rate the sample with which the γ-C₂S was mixed generated CaCO₃ when it reacted with CO₂ therefore, carbonatization depth and porosity were reduced, and the compressive strength was increased.