A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The evolution of coal gangue (CG)–calcium hydroxide (CH)–gypsum–H2O system
Abstract In order to further study the reaction of CG in cement hydration system, a simplified CG-CH-gypsum-H2O system was simulated in this paper. According to pH value, electrical conductivity tests and XRD analysis, the reactive CG materials have pozzolanic activities. The variations of CG and CH in reaction process could be investigated by acid dissolve method and DSC analysis respectively. As shown from the results, the CG could be used as a secondary cementitious material. In the research system, the possibility of secondary hydration effect of CG was proved and it takes part in the hydration reactions fleetly during the early ages. Whereas, in the long run, the CG reacted was limited and it was just consumed approximately 20% in total in 90d ages. On the other hand, according to their different variation trends of CG and CH, it is reasonable to believe that the reactions between CG and CH have two stages: firstly, reactions of CG and CH were carried out and made some products in the early ages; secondly, CH would continue to react with the products which were produced in the former step. The SEM observations and compressive strength tests are also support this conclusion.
The evolution of coal gangue (CG)–calcium hydroxide (CH)–gypsum–H2O system
Abstract In order to further study the reaction of CG in cement hydration system, a simplified CG-CH-gypsum-H2O system was simulated in this paper. According to pH value, electrical conductivity tests and XRD analysis, the reactive CG materials have pozzolanic activities. The variations of CG and CH in reaction process could be investigated by acid dissolve method and DSC analysis respectively. As shown from the results, the CG could be used as a secondary cementitious material. In the research system, the possibility of secondary hydration effect of CG was proved and it takes part in the hydration reactions fleetly during the early ages. Whereas, in the long run, the CG reacted was limited and it was just consumed approximately 20% in total in 90d ages. On the other hand, according to their different variation trends of CG and CH, it is reasonable to believe that the reactions between CG and CH have two stages: firstly, reactions of CG and CH were carried out and made some products in the early ages; secondly, CH would continue to react with the products which were produced in the former step. The SEM observations and compressive strength tests are also support this conclusion.
The evolution of coal gangue (CG)–calcium hydroxide (CH)–gypsum–H2O system
Tao, Shi (author) / Bi-wan, Xu (author) / Hui-sheng, Shi (author)
Materials and Structures ; 41 ; 1307-1314
2007-11-13
8 pages
Article (Journal)
Electronic Resource
English
The evolution of coal gangue (CG)–calcium hydroxide (CH)–gypsum–H2O system
| British Library Online Contents | 2008
The evolution of coal gangue (CG)–calcium hydroxide (CH)–gypsum–H2O system
| Springer Verlag | 2008
The evolution of coal gangue (CG)–calcium hydroxide (CH)–gypsum–H2O system
| Online Contents | 2008
The evolution of coal gangue (CG)–calcium hydroxide (CH)–gypsum–$ H_{2} $O system
| Online Contents | 2007
The evolution of coal gangue (CG)–calcium hydroxide (CH)–gypsum–$ H_{2} $O system
| Online Contents | 2007