晶种对硫铝改性低钙硅酸盐水泥熟料烧成的影响及机理  

Influences of Crystal Seed on Formation of Calcium Sulfoaluminate Modified Low-Calcium Portland Cement Clinker

作　　者：赵晓悦 任雪红 张磊 张文生 叶家元 张洪滔 曹立学 陈绍良 ZHAO Xiaoyue;REN Xuehong;ZHANG Lei;ZHANG Wensheng;YE Jiayuan;ZHANG Hongtao;CAO Lixue;CHEN Shaoliang(School of Materials Science and Engineering,Tianjin Chengjian University,Tianjin 300384,China;State Key Laboratory of Green Building Materials,China Building Materials Academy Co.,Ltd.,Beijing 100024,China)

机构地区：[1]天津城建大学材料科学与工程学院,天津300384 [2]中国建筑材料科学研究总院有限公司,绿色建筑材料国家重点实验室,北京100024

出　　处：《硅酸盐学报》2025年第1期37-46,共10页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(52341202);中国建材集团攻关专项(2021HX0304)。

摘　　要：为了设计发展新型低钙水泥熟料,采用原位高温X射线衍射、扫描电子显微镜及热分析等,以硅酸盐水泥熟料中硅酸三钙(C_(3)S)、硅酸二钙(C_(2)S)等矿物为晶种,研究了硅酸盐水泥熟料添加对硫铝改性低钙硅酸盐水泥熟料的形成、矿物组成和微观结构等的影响及其机理。结果表明:硅酸盐水泥熟料的掺入促进了液相烧结,C_(2)S和硫铝酸钙(C_(4)A_(3)$)晶粒尺寸增大。在熟料晶种中C_(2)S和铁相的诱导作用下,C_(2)S和铁相的含量增加;由于熟料晶种中C_(3)S在低温分解,未能起到促进C_(3)S形成及其与C_(4)A_(3)$共存的作用,且当硅酸盐水泥熟料掺量为10%(质量分数)时,C_(4)A_(3)$含量明显降低。此外,由于化学成分固溶变化,熟料晶种促进稳定β-C_(2)S和o-C_(4)A_(3)$,但不利于高活性晶型矿物α′-C_(2)S和c-C_(4)A_(3)$的稳定。Introduction The existing cement clinker systems have some challenges.The production process of calcium sulfoaluminate(CSA)clinker,which primarily contains mineral C_(4)A_(3)$,requires a significant amount of high-quality bauxite resources,thus leading to a higher production cost.Compared to CSA,a high belite calcium sulfoaluminate(BCSA)cement reduces the demand for high-grade bauxite during production,but has a slower strength development over time.To ensure the synergistic development of both early age performance and strength development in clinker systems,calcium sulfoaluminate-modified Portland cement(designated as S.M.P.)is further developed.However,alite(C_(3)S)remains a dominant mineral,resulting in relatively high carbon emissions.For the compositional and performance characteristics of S.M.P.and BCSA clinker,this study proposed a new system for preparing a low-calcium calcium sulfoaluminate-modified Portland cement clinker with belite(C_(2)S)as a dominant mineral(i.e.,C_(3)S/C_(2)S–C_(4)A_(3)S–C_(4)AF–CaSO_(4)).This study also utilized minerals such as C_(3)S and C_(2)S from Portland cement clinker as crystal seed additives.The effect of adding Portland cement clinker on the sintering process and the mineral composition structure of the low-calcium calcium sulfoaluminate-modified Portland cement clinker was investigated.In addition,the underlying mechanisms were explored to provide a theoretical and technical guidance for the design and development of low-calcium cement clinkers.Methods The designed mineral composition of the calcium sulfoaluminate-modified low-calcium Portland cement clinker was45%–50%(in mass,the same below)of C_(2)S,5%–10%of C_(3)S,25%of C_(4)A_(3)$,10%of C_(4)AF,and 10%of f-CaSO_(4).Calcium sulfoaluminate-modified low-calcium Portland raw meals were prepared with industrial raw materials.Portland cement clinker was used as a crystal seed at different incorporation contents of 0%,1%,3%,5%,10%,and 12%.The mineral composition and microstructure of calcium sulfoaluminate-modif

关 键 词：晶种 低钙硅酸盐水泥熟料 硫铝酸钙 硅酸二钙 硅酸三钙 液相 

分 类 号：TQ172.11[化学工程—水泥工业]