Adsorption properties of CFBC ash-cement pastes as compared with PCC fly ash-cement pastes  

作　　者：Zhijuan Wang Yuanming Song 

机构地区：[1]School of Environmental and Materials Engineering, YantaiUniversity, Yantai 264005, China

出　　处：《International Journal of Coal Science & Technology》2016年第1期62-67,共6页国际煤炭科学技术学报（英文）

基　　金：the National Nature Science Foundation of China （51272222）.

摘　　要：Circulating fluidized bed combustion （CFBC） ash can be potentially used as supplementary cementitious materials for concrete production due to its desirable pozzolanic activity. The adsorption properties of CFBC ash-cement pastes were studied, and ordinary pulverized coal combustion （PCC） fly ash-cement pastes were used as control. The water-adsorption and superplasticizer （SP）-adsorption properties of the pastes were evaluated by water demand and UV-visible absorption spectroscopy respectively. The results show that CFBC ash-cement system has greater compressive strength as compared with PCC fly ash-cement system at a given curing age, although the water demand of the former is significantly higher than that of the latter. CFBC ash-cement pastes possess higher adsorption ability of aliphatic SP than PCC fly ash-cement pastes and the adsorption amount increases with an increase in ash replacement ratio. CFBC ash- cement pastes exhibit lower workability with higher slump loss. It is concluded that CFBC ash can be potentially used as supplementary cementitious material in concrete production, but the mix design of CFBC ash concrete needs to be appropriately adjusted. It is suggested that CFBC ash is used for the production of the concrete needing low flowability.

关 键 词：CFBC ash - Coal ash CONCRETE ADSORPTION SUPERPLASTICIZER FLOWABILITY 

分 类 号：TU528.45[建筑科学—建筑技术科学] TK229.66[动力工程及工程热物理—动力机械及工程]