α、β-半水石膏复合胶凝材料的性能及微观结构研究  

STUDY ON THE PERFORMANCE AND MICROSTRUCTURE OF Α- AND Β- HEMIHYDRATE COMPOSITE PLASTERS

作　　者：余海燕[1] 石峻尧 杨久俊[1] 程海平[1] 

机构地区：[1]天津城建大学材料科学与工程学院,天津300384

出　　处：《南阳理工学院学报》2015年第4期98-102,共5页Journal of Nanyang Institute of Technology

基　　金：国家科技支撑计划项目(2013BAJ10B03)

摘　　要：本文研究了α-半水石膏的掺量对建筑石膏标准稠度用水量、凝结时间、强度等宏观性能的影响,并且采用SEM和压汞法分析了复合胶凝材料的水化物的形貌和孔结构。结果表明:当α-半水石膏掺量从0%增加至20%时,标准稠度用水量降低了5.6%,初、终凝时间分别延长了2 min和7.5 min,抗折、抗压强度分别提高了58.3%和71.9%。随着α-半水石膏掺量的提升,针棒状水化产物数量减少,短柱状水化产物数量增加,石膏硬化体孔隙率降低,孔径趋于细化。The effect α-hemihydrate contents on the performance(water demand, setting time and strength) of the composite con-struction plasters was studied. In addition, the crystal morphology of the hydration products and pore structures of the composite plas-ters were analysed by scanning electric microscope ( SEM) and mercury intrusion porosimetry ( MIP) . The results indicate that the wa-ter demand decreased by 5. 6%, the initial and final setting time increased by 2 min and 7. 5 min respectively, and flexural and com-pressive strength increased by 58. 3% and 71. 9% respectively when the α-hemihydrate contents in the composite plasters increased from 0% to 20% by mass. With the increase of α-hemihydrate content, the hydration products with the short bar shape increased while the needle shape ones decreased, which resulted in decreased porosity and pore size of the plasters.

关 键 词：Α-半水石膏 复合胶凝材料 力学性能 微观结构 

分 类 号：TB332[一般工业技术—材料科学与工程]