Presently, for the cement industry, studies that seek to reduce CO 2 , 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-C 2 S(γ-C 2 S) to fix CO 2 have been actively conducted. The γ-C 2 S compound has an important function in reacting to CO 2 and stiffening through carbonatization in the air. The γ-C 2 S compound, reacting to CO 2 in the air, generates CaCO 2 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-C 2 S, limestone sludge and waste foundry sands are used these materials are plasticized for 30 or 60 minutes at 1450 o C, and are prevented from being cooled in the temperature range of 30~1000 o C when they are about to be cooled. XRD analysis and XRF analysis are used to determine the effects of this process on γ-C 2 S 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 CO 2 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-C 2 S was synthesized, the clinker that was plasticized at 1450 o C for one hour demonstrated the highest yield rate the sample with which the γ-C 2 S was mixed generated CaCO 3 when it reacted with CO 2 therefore, carbonatization depth and porosity were reduced, and the compressive strength was increased.
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