期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Preparation of New Cementitious System using Fly Ash and Dehydrated Autoclaved Aerated Concrete 被引量:3
1
作者 水中和 LU Jianxin +2 位作者 TIAN Sufang SHEN Peiliang DING Sha 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第4期726-732,共7页
We experimentally studied the interaction between pozzolanic material(fly ash) and dehydrated autoclaved aerated concrete(DAAC). The DAAC powder was obtained by grinding aerated concrete waste to particles fi ner ... We experimentally studied the interaction between pozzolanic material(fly ash) and dehydrated autoclaved aerated concrete(DAAC). The DAAC powder was obtained by grinding aerated concrete waste to particles fi ner than 75μm and was then heated to temperatures up to 900 ℃. New cementitious material was prepared by proportioning fly ash and DAAC, named as AF. X-ray diffraction(XRD) was employed to identify the crystalline phases of DAAC before and after rehydration. The hydration process of AF was analyzed by the heat of hydration and non-evaporable water content(Wn). The experimental results show that the highest reactivity of DAAC can be obtained by calcining the powder at 700 ℃ and the dehydrated products are mainly β-C2 S and CaO. The cumulative heat of hydration and Wn was found to be strongly dependent on the replacement level of fl y ash, increasing the replacement level of fl y ash lowered them in AF. The strength contribution rates on pozzolanic effect of fl y ash in AF are always negative, showing a contrary tendency of that of cement-fl y ash system. 展开更多
关键词 dehydrated autoclaved aerated concrete pozzolanic reaction heat of hydration nonevaporable water content strength contribution rate
下载PDF
Hydration Mechanism of Cement-based Materials with Different Si-rich Mineral Admixtures 被引量:3
2
作者 何真 胡玲玲 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2018年第3期654-660,共7页
Early hydration mechanism of cement-based materials with silica fume, nano-SiO2 and silica sol of different contents was investigated, and the detailed effect of these Si-rich mineral admixtures in three stages of ear... Early hydration mechanism of cement-based materials with silica fume, nano-SiO2 and silica sol of different contents was investigated, and the detailed effect of these Si-rich mineral admixtures in three stages of early hydration(NG, I, D) using kinetics model was focused. The results showed that silica fume, nano-SiO2, and silica sol have significant effect on kinetic parameters n, k1, k2 and k3, the fineness and existing form of SiO2 particles in these Si-rich mineral admixtures are two important factors to affect the hydration process and on the parameters. Through integrated use of methods of hydration heat-Krstulovic-Dabic Modelsynthetical thermal analysis, data of hydration heat were collected, hydration degree was characterized, as well as the resulting crystallization behavior of early hydration, to build a numerical relationship between parameter n and CH contents that n decreases with increasing CH, and thus, a direct connection between hydration heat release behavior and crystallization behavior has been established. 展开更多
关键词 silica fume nano-SiO2 silica sol hydration kinetics model early hydration CH content
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部