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Study on hydration and mechanical properties of Portland cement mixed recycled gypsum

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Document pages: 8 pages

Abstract: In this work, Portland cement - (OPC -) mixed recycled gypsum material (r-cp) was prepared to understand its hydration and mechanical properties. It is found that rapid rehydration ettringite (AFT) accelerates the hydration of r-cp, while the content and strength of semi hydrated ettringite and CaCO3 decrease, which reduces the strength of r-cp. On the contrary, consistent with previous studies, the strength of OPC mixed Paris gypsum material (POCP) was improved by forming pores in aft, Ca (OH) 2 and CaCO3 filling paste. Therefore, different strength development can be seen in POCP and r-cp. In principle, these findings will lay a solid foundation for the utilization of recycled gypsum.

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