Investigation on the hydration of CFBC fly ash

被引：102
作者：
Sheng, Guanghong [2 ]
Li, Qin [1 ]
Zhai, Jianping [1 ]
机构：
[1] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210093, Jiangsu, Peoples R China
[2] Anhui Univ Technol, Sch Architecture & Civil Engn, Maanshan 243002, Anhui, Peoples R China
来源：
FUEL | 2012年 / 98卷
关键词：
CFBC fly ash; Self-cementing; Lime; Hydration; DIFFERENTIAL SCANNING CALORIMETRY; CO-FIRING COAL; COMBUSTION ASHES; TECHNOLOGIES; SULFATION; BEHAVIOR;
D O I：
10.1016/j.fuel.2012.02.008
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
Self-cementitious properties of fly ash from circulating fluidized bed combustion boiler (CFBC) with limestone addition were investigated, especially the effect of lime on self-cementing process. The CFBC fly ash is self-cementitious and its main hydration products are ettringite (AFt), hydrated calcium silicate (CSH), portlandite, and gypsum. Slaking of free lime has a great effect on the self-cementing process of CFBC fly ash, accelerating the setting process. The self-cementing process of CFBC fly ash paste is based on three main reactions: (1) generation of Ca(OH)(2) micelles by quick slaking of lime, (2) generation of AFt by active alumina reacting with CaSO4 and Ca(OH)(2), and (3) generation of CSH by active silica reacting with Ca(OH)(2). (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：61 / 66
页数：6
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