摘要
针对搅拌站压滤渣的资源化利用问题,分析了其矿物组成,利用化学滴定法和热重法分析了压滤渣中未水化水泥的近似含量,并研究了搅拌站压滤渣粉对水泥胶砂需水性、力学性能的影响。结果表明:压滤渣中矿物种类稳定,相对于水泥,压滤渣粉的需水量增加;存放18 d,压滤渣中未水化水泥质量分数约为27.7%,活性较低,粉磨处理对提高压滤渣粉活性影响不大;相对于原状压滤渣粉,粉磨处理后的压滤渣粉对水泥胶砂抗压强度和抗折强度提升效果甚微。磨细压滤渣粉混凝土的干燥收缩性能低于基准组,且在28 d时的干燥收缩率达到最大,标准养护28 d时压滤渣粉混凝土的表面存在不连续的纤维状C-S-H凝胶,分布零乱,没有形成网状结构。
Addressing the resource utilization of filter slag powder in concentrate batching plants,this study analyzed its mineral composition,used chemical titration and thermogravimetric methods to estimate the content of unhydrated cement in the slag,and examined its effects on the water demand and mechanical properties of cement mortar.The results showed that the mineral types in the filter slag powder were stable,and its water demand was higher compared to cement.The mass fraction of unhydrated cement in the slag was about 27.7%after 18 days of storage,indicating low activity.Grinding treatment had a negligible effect on improving the activity of the filter slag powder.Compared to the original filter slag powder,the ground filter slag powder had a minimal effect on improving the compressive strength and flexural strength of cement mortar.The drying shrinkage performance of concrete mixed with finely ground filter slag powder was poorer than the control group,and the drying shrinkage rate reached its maximum at 28 days.After 28 days of standard curing,the surface of the filter slag powder concrete exhibited discontinuous fibrous C-S-H gel,which was disordered and not in a network structure.
作者
王宁辉
张晓静
熊梓铭
汪一铖
王德志
WANG Ninghui;ZHANG Xiaojing;XIONG Ziming;WANG Yicheng;WANG Dezhi(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;China Three Gorges Construction Engineering Corporation,Chengdu 610041,China;Engineering Research Center Funded by Ministry of Education for Effective Utilization of Water Resources in Modern Agriculture in Arid Areas,Yinchuan 750021,China;Ningxia Center for Research on Earthquake Protection and Disaster Mitigation in Civil Engineering,Yinchuan 750021,China;Engineering Research Center Funded by Ministry of Education for Water-saving Irrigation and Water Resources Regulation,Yinchuan 750021,China)
出处
《宁夏工程技术》
CAS
2024年第1期48-53,共6页
Ningxia Engineering Technology
基金
宁夏回族自治区重点研发计划项目(2022BEE03001)
国家自然科学基金项目(51968060)
宁夏自然科学基金项目(2023AAC03040)。
关键词
压滤渣粉
水泥胶砂
力学性能
需水性
水泥含量
filter slag powder
cement mortar
mechanical property
water demand
cement content
