通过水化温升和SEM分析对再生石膏水化过程、强度及耐水性的变化进行研究，旨在揭示再生石膏性能变化的规律。结果表明：再生石膏水化变慢，凝结时间延长；它的强度降低，耐水性变差，强度降低幅度为45%~55%，吸水率、溶蚀率及干湿循环质量损失率升高，但饱水强度和干湿循环强度降低。分析表明：再生石膏结晶较差，孔隙率增大是其强度等性能降低的主要原因。%The hydration process, strength and waterproof properties of recycled gypsum were investigated using temperature increase curves and SEM analysis to reveal the performance change laws of regenerative gypsum. The results showed that the hydration of recycled gypsum was delayed, correspondingly leading to the extending of setting time of recycled gypsum; The strength reduced and waterproof properties became poorer. And the decreasing rate in strength was 45%~55%, the water absorption, dissolution rate and mass loss in dry-wet process increased, but the water saturated strength and dry strength in dry-wet process decreased. The analysis indicates that the main reason of reduction of strength and waterproof properties is that the poorer crystallization and more pores in hardened recycled gypsum.
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