粉煤灰-免煅烧脱硫石膏胶凝活性激发机制研究(一)  

Activation Mechanism of Fly Ash and Non-calcined FGD Gypsum System-Part 1

作　　者：刘云霄[1] 杨俊[1] 

机构地区：[1]长安大学建筑工程学院,西安710061

出　　处：《硅酸盐通报》2016年第2期606-610,共5页Bulletin of the Chinese Ceramic Society

基　　金：陕西省科技统筹创新工程计划项目(2013KTCG02-02);西安市建设科技计划项目(SJW2015-10)

摘　　要：为更有效地利用燃煤电厂两大工业固体废弃物-粉煤灰及原状未煅烧脱硫石膏,进一步揭示粉煤灰-未煅烧脱硫石膏体系胶凝性能的产生机制,采用石灰作为碱性激发剂对其活性进行激发。80℃条件下湿热养护7 d后,通过测定及分析试件抗压强度,选取能够最有效地利用粉煤灰及未煅烧脱硫石膏活性的激发方式。试验发现,粉煤灰:脱硫石膏:石灰为10∶3∶7时强度达到最高,体积稳定性良好。热分析数据表明,此时水化反应生成一定量钙矾石及较多水硅钙石,对最终强度起主要贡献。In this paper lime was used as alkali activator to fly ash and non-calcined FGD gypsum system, for the purpose of effectively utilizing this two main solid waste of coal-fired power plant and revealing the mechanism of its cementing performance. After hydrothermal curing at 80 ℃ for 7 d, compressive strength was test to seek the most effective activation method. The results showed that the compressive strength reached the highest when the ratio of FA to FGD to lime was 10 to 3 to 7 ,meanwhile the volume stability maintained well. By means of TG-DSC it has been shown that hydration products were dicalcium silicate hydrate and a certain amount of Ettringite, which might be the main source of strength.

关 键 词：粉煤灰 烟气脱硫石膏 免煅烧 活性激发 

分 类 号：TD985[矿业工程—选矿]