首页期刊信息编委及顾问期刊发行联系方式使用帮助留言板ENGLISH
位置:首页 >> 正文
2CaSO4·K2SO4 复盐对硅酸盐水泥熟料的烧成及水化的影响
作者:黄黎明1 2 杨正宏1 2 宋文娟1 2 李好新1 2 
单位:1. 同济大学材料科学与工程学院 上海 201804 2. 同济大学 先进土木工程材料教育部重点实验室 上海 201804 
关键词:硫酸钾钙复盐 高温烧成 矿物成分 晶型 水化性能 
分类号:TQ172
出版年,卷(期):页码:2017,45(11):0-0
DOI:
摘要:
通过高温合成2CaSO4·K2SO4 复盐,再将其以不同掺量掺入CaCO3、SiO2、Al2O3 和Fe2O3 组成的水泥生料中,在1 450 ℃煅烧至水泥熟料中f-CaO 小于1%。研究了2CaSO4·K2SO4 复盐对水泥熟料高温烧成过程、矿物组成与结构及水化性能的影响。
结果表明:2CaSO4·K2SO4 降低了CaCO3 起始分解温度,改变了熟料的熔融液相性质,增加了液相量,降低了矿物的最低共熔温度;2CaSO4·K2SO4 提高了熟料中C3S 含量,降低了C3A 和C4AF 含量,烧成熟料中C2S 晶型主要为β 型,也存在少量γ
型,2CaSO4·K2SO4 使C3S 晶型由R 型向M1 型转变,但晶型不随掺量改变。复盐的掺入缩短了熟料水化的诱导期,促使第二水化放热峰最大值提前出现,2CaSO4·K2SO4 掺量增加抑制了熟料前期和后期水化性能,提高了中期水化放热速率。

 The 2CaSO4•K2SO4 was firstly synthesized via high temperature reaction, and then mixed with CaCO3, SiO2, Al2O3 and Fe2O3 as cement raw materials. Those raw materials were sintered at 1450°C. Influence of 2CaSO4•K2SO4 on the sintering process, mineral composition and polymorphs, and hydration properties of sintered clinker was investigated. The results show that the 2CaSO4•K2SO4 reduces the initial decomposition temperature of CaCO3, improves the melt liquid phase properties of raw materials, increases the content of formed liquid phase and reduces the minimum eutectic temperature of raw materials. The 2CaSO4•K2SO4 increases the content of C3S and reduces the contents of C3A and C4AF in the clinker. The polymorph of C2S in the clinker is mainly β-type, and there exists a small amount of γ-type,the polymorph of C3S is changed from R to M1 in the presence of 2CaSO4•K2SO4, but its polymorphism does not change with the increased content of 2CaSO4•K2SO4. The 2CaSO4•K2SO4 reduces the hydration induction period of clinker and increases the maximum value of the second hydration exothermic peak. The initial and late hydration properties of clinker are inhibited due to the 2CaSO4•K2SO4, but the hydration rate of clinker in the medium term is increased.

基金项目:
国家自然科学基金重大项目(No:51132010)。
作者简介:
黄黎明(1993—),男,硕士研究生。
参考文献:
服务与反馈:
文章下载】【加入收藏
中国硅酸盐学会《硅酸盐学报》编辑室
京ICP备10016537号-2
京公网安备 11010802024188号
地址:北京市海淀区三里河路11号    邮政编码:100831
电话:010-57811253  57811254    
E-mail:jccs@ceramsoc.com