中文摘要：

研究了大分子类缓凝剂骨胶对建筑石膏凝结时间、强度、液相离子浓度与过饱和度，以及二水石膏晶体形貌和硬化体孔结构的影响，分析了石膏强度损失的内在原因．结果表明：骨胶对建筑石膏有显著的缓凝作用，它对建筑石膏强度的负面影响大大低于小分子类缓凝剂；骨胶对二水石膏晶体形貌和硬化体孔隙率影响较小，但使二水石膏晶体尺度增大，孔径分布粗化，这正是石膏强度降低的内在原因．

英文摘要：

Influence of one macromolecule-type retarder bone glue on the setting time, strength, ion concentration in liquid phase and supersaturation degree, crystal morphology of dehydrate and microstructure of hardened paste of building gypsum is investigated. Furthermore, internal cause of strength loss of building gypsum with addition of retarder is analyzed, The results indicate that bone glue could retard the hydration of building gypsum markedly, but its negative influence on the strength of building gypsum is far lower than that of low molecule-type retarders. Bone glue has a minor effect on crystal morphology of dehydrate and porosity of hardened paste, but it causes the large crystal size and coarsening of pore size distribution of hardened gypsum paste, which is the very intrinsic reason of strength loss of building gypsum.