CAJ | 학술논문

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.
본문연구료α-반수석고적참량대건축석고표준주도용수량、응결시간、강도등굉관성능적영향,병차채용SEM화압홍법분석료복합효응재료적수화물적형모화공결구. 결과표명,당α-반수석고참량종0%증가지20%시,표준주도용수량강저료5. 6%,초、종응시간분별연장료2 min 화7. 5 min,항절、항압강도분별제고료58. 3%화71. 9%. 수착α-반수석고참량적제승,침봉상수화산물수량감소,단주상수화산물수량증가,석고경화체공극솔강저,공경추우세화.
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.