摘要
为实现炉底灰在大体积混凝土工程中的资源化利用,结合净浆强度测定、X射线衍射、红外光谱及扫描电镜等手段,研究了高温养护对不同龄期炉底灰胶凝体系强度及水化产物的影响,结果表明:炉底灰胶凝体系水化产物主要为羟钙石,红辉沸石,文石以及C-S-H凝胶,高温养护促进了胶凝体系中硅酸钙的水化,生成更多的羟钙石和C-S-H凝胶,提高了试样早期强度;养护后期,胶凝体系水化速率及强度增长速率减小,羟钙石参与碱激发反应被消耗,C-S-H凝胶聚合度降低。高温养护下,胶凝试样的早期微观形貌以密实的网状C-S-H凝胶为主,随着龄期的增长,C-S-H凝胶结构更加致密,包裹于凝胶中的羟钙石在高温作用下产生微裂隙,阻碍了试样强度的发展。
In order to realize the resource utilization of furnace bottom ash in mass concrete project,the effect of high temperature maintenance on the strength and hydration products of the furnace bottom ash cementitious system at different stages was studied by means of paste strength measurement,X-ray diffraction,infrared spectroscopy and scanning electron microscopy.The results show that the hydration products of the furnace bottom ash cementitious system are mainly portlandite,epidesmine,aragonite and C-S-H gel.High temperature maintenance promotes the hydration of calcium silicate in the cementitious system,generates more portlandite and C-S-H gel,and improves the early strength of the sample.The hydration rate and the strength growth rate of the cementing system decrease,and portlandite is consumed in alkali-activated reaction and the degree of C-S-H gel polymerization decreases at the later stage of maintenance.Under high temperature maintenance,the early morphology of the cementitious sample is mainly composed of dense mesh C-S-H gel.With the progress of stages,the structure of C-S-H gel is denser.The portlandite wraps in the gel produces a micro crack under high temperature,which hinders the development of the strength of the sample.
作者
卢前明
张元馨
郭兵兵
任达华
刘幸亚
LU Qian-ming;ZHANG Yuan-xin;GUO Bing-bing;REN Da-hua;LIU Xing-ya(School of Safety Engineering,Henan University of Engineering,Zhengzhou 451191,China;Department of Modern Management,Zhengzhou Technical College Department of Modern Management,Zhengzhou 450121,China)
出处
《硅酸盐通报》
CAS
北大核心
2019年第10期3121-3125,3132,共6页
Bulletin of the Chinese Ceramic Society
基金
河南省科技攻关项目(192102310463,192102310198)
河南省高校重点科研项目资助计划(18A440007)
河南工程学院博士基金(D2017003)
关键词
炉底灰胶凝体系
高温养护
微观分析
水化产物
coal bottom ash cementitious system
high temperature curing
microscopic analysis
hydration product
