摘要
为探究磨细铁尾矿粉在无熟料体系中的固结性能,以硅铝型铁尾矿为主体材料,掺配钙、硫、硅校正材料,在磨细比表面积约为1 000 m2/kg时,使铁尾矿粉获得无熟料高强度固结效果.利用扫描电镜(SEM)、X射线衍射仪(XRD)、差示扫描同步热分析仪(DSC-TG)测试技术及化学滴定方法,分析了固结体中水化产物的种类、含量及微观形貌,研究了无熟料固结材料的水化机理.结果表明:当钙、硫、硅校正材料总占比为40%,且三者之间质量比为20∶5∶15时,利用铁尾矿细磨过程中矿物表面晶格畸变形成的非晶质层成分与校正材料之间的水化反应及产物协同效应,能够获得28 d强度为52.08 MPa的固结体;水化过程中,钙矾石(AFt)的快速生成为硬化浆体提供了早期强度,水化硅酸钙(C-S-H)是稳定固结体后期强度的保证,1/7~1/5的晶胶比确保了固结体强度的持续发展.
In order to explore the consolidation performance of iron tailing powder in clinker free system, a clinker-free high-strength consolidation material with ground iron tailing powder as the main material was prepared. Using scanning electron microscope(SEM), X-ray diffraction(XRD), differential scanning synchronous thermal analyzer(DSC-TG) and chemical titration methods, the type, content and micro morphology of hydration products in the consolidated body were analyzed, and the hydration mechanism of the non-clinker consolidated material was studied.The results show that when the total proportion of calcium, sulfur and silicon is 40% and the ratio between them is 20∶5∶15, the consolidated body with a strength of 52.08 MPa at 28 d can be obtained by using the hydration reaction between the amorphous layer formed by lattice distortion on the surface of iron tailing powder and the correction material by its product synergistic effect. Ettringite(AFt) provides the early strength of the paste, calcium silicate hydrate(C-S-H) is the guarantee for stabilizing the later strength, and the ratio of crystal to gel within 1/7–1/5 is the key factor in ensuring the continuous development of strength.
作者
安树好
刘娟红
张月月
王洪江
AN Shuhao;LIU Juanhong;ZHANG Yueyue;WANG Hongjiang(College of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Urban Underground Space Engineering,University of Science and Technology Beijing,Beijing 100083,China;Research Institute of Urbanization and Urban Safety,University of Science and Technology Beijing,Beijing 100083,China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2023年第2期172-178,共7页
Journal of Building Materials
基金
国家自然科学基金资助项目(51834001)。
关键词
铁尾矿粉
无熟料固结
非晶质层
水化机理
晶胶比
iron tailing powder
non-clinker consolidation
amorphous layer
hydration mechanism
ratio of crystal to gel
