摘要
通过研究钢渣掺入量对钢渣-HBCSA复合胶凝体系水化进程、强度性能及体积稳定性的影响规律,并借助微观测试方法剖析其水化过程与微观结构变化,结果发现,当钢渣掺量低于10%时,对各龄期强度性能影响微弱,活性指数均超96%;超过10%后,硬化浆体强度随掺量增加而降低。钢渣掺量为10%时,60d自由膨胀率达0.038%,较空白组增长22.6%。水化3d龄期时,钢渣掺量低于10%,水化放热总量相近;高于10%时,该总量差随掺量增加而减小。微观层面,在HBCSA中掺入10%钢渣,早期钢渣因活性低起成核填隙作用,使试块致密性良好,后期钢渣中f-CaO和C_(2)S的水化与其他物质间产生协同作用,促进反应进行。本研究成果为钢渣-HBCSA复合胶凝体系的应用与优化提供了理论依据。
This paper focuses on the steel slag-HBCSA composite cementing system,deeply studying the effects of steel slag incorporation on the hydration process,strength performance,and volume stability of the system,and analyzing its hydration process and microstructural changes using microscopic testing methods.The study found that when the steel slag content is less than 10%,the impact on strength performance at all ages is slight,with an activity index exceeding 96%;when it exceeds 10%,the strength of the hardened paste decreases as the proportion increases.When the steel slag content is 10%,the 60-day free expansion rate reaches 0.038%,an increase of 22.6% compared to the blank group.At the hydration age of 3 days,with steel slag content below 10%,the total heat release from hydration is similar;above 10%,the difference in total heat release decreases with increasing slag content.At a microscopic level,incorporating 10%steel slag in HBCSA allows early steel slag to play a nucleation and filling role due to its low activity,resulting in good compactness of the test block.In the later stage,the hydration of f-CaO and C_(2)S in the steel slag interacts synergistically with other substances,promoting the reaction.The findings of this study provide a theoretical basis for the application and optimization of the steel slag-HBCSA composite cementing system.
作者
杨君健
殷祥男
王旭方
孙健
YANG Junjian;YIN Xiangnan;WANG Xufang;SUN Jian(China Testing&Certification International Group Co.,Ltd.,National Cement Quality Inspection and Testing Center,Beijing 100024)
出处
《中国建材科技》
2025年第S1期364-369,共6页
China Building Materials Science & Technology
关键词
钢渣
高贝利特硫铝酸钙
水化
微观结构
固废
Steel slag
High belite sulfoaluminate cement
Hydration
Microstructure
Solid waste
