摘要
为了进一步分析煤矸石在水泥中的水化特性,将煤矸石-水泥体系简化为煤矸石-氢氧化钙-石膏-水体系进行研究.根据pH值、电导率以及XRD图谱可知,活化煤矸石具有火山灰活性.通过酸溶法和差示扫描量热法(DSC)分别对体系中的煤矸石和氢氧化钙进行定量分析,结果表明,煤矸石-氢氧化钙体系在溶液中存在二次水化反应,能够生成一定的水化产物.煤矸石在早期即参与了水化反应,而氢氧化钙的反应则是分阶段进行的.煤矸石的活性有限,在90 d龄期内其参与反应的量只占总质量的20%左右.根据煤矸石和氢氧化钙反应量的变化趋势来看,体系的反应过程可以分为2个阶段:在早期,煤矸石和氢氧化钙首先反应并产生部分水化产物;随后,氢氧化钙和产生的水化产物及煤矸石继续反应.电镜观测和强度特征分析结果证实了上述结论.
A simplified CG-CH-gypsum-HzO system was simulated to further study the reaction of coal gangue （CG） with calcium hydroxide （CH） in cement hydration system. According to pH value, electrical conductivity and XRD spectra, the reactive CG materials have pozzolanic activities. The variations of CG and CH in reaction process were quantitatively analyzed by acid dissolve method and differential scanning calorimetry （DSC） analysis respectively. The results prove the possibility of secondary hydration effect of CG and show that it takes part in the hydration reactions fleetly during the early ages. Whereas, in the long run, the CG reaction is limited and CG is just consumed approximately 20% in total in 90 d ages. According to their different variation trends.of CG and CH, fhe reactions between CG and CH have two sta- ges： firstly, reactions of CG and CH are carried out and make some products in the early ages; secondly, CH continues to react with the products produced in the former step. SEM observations and compressive strength tests testified the conclusion.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2008年第5期900-904,共5页
Journal of Zhejiang University：Engineering Science
基金
国家“973”重点基础研究发展规划资助项目(2001CB610705-01)
关键词
煤矸石
氢氧化钙
火山灰活性
水化反应
微观结构
coal gangue calcium hydrate
pozzolanic activities
hydration reaction
microstructure
