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The purpose of this study is to evaluate the acid resistance of cement mortar admixed with waste phosphogypsum by steam curing admixture. Waste Phosphogypsum is a by-product from the phosphoric acid process for manufacturing fertilizers. It consists mainly of CaS0₄ . 2H₂O and contains some impurities such as P₂O5, F-and organic substances. The waste phosphogypsums is made use of 4 forms(Dihydrate, B-Hemihydrate, III-Anhydrite and II-Anhydrite) which were changed to in low temperature of calcination. The mass change and reduction ratio of compressive strength of cement mortar are investigated to evaluate the acid resistance. The specimens of cement mortar were immersed in HCI(5%) and HZS04(5%, 10%) during 14, 28 and 56days. As a result, mass change and reduction ratio of compressive strength of cement mortar admixed with waste phosphogypsum are lower than cement mortar contained OPC alone. Also, Ill-Anhydrite is comparable to II-Anhydrite in acid resistance. Therefore, Ill-Anhydrite phosphogypsum calcined at lower temperature could be used as steam curing admixture for concrete 2th production.

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2. 실험

3. 실험 결과 및 고찰

4. 결론

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UCI(KEPA) : I410-ECN-0101-2009-540-014282846