摘要
采用流化涡旋技术对工业固体废弃物改性,以改性电石渣为碱性激发剂,以改性矿渣/粉煤灰为硅铝质原料制成全固废碱激发胶凝材料,并采用压汞实验(MIP)、水化热测定、X射线衍射(XRD)、扫描电镜(SEM)和能谱分析(EDS)等手段研究其水化机理与微观结构。研究结果表明:流化涡旋技术对工业固废具有优异的物理、化学改性效果,使固废原料具备更高的反应活性;以改性原料制成的碱激发材料具有更优的力学性能和孔径分布特征,其7 d和28 d抗压强度分别可达22.4 MPa和37.8 MPa;改性电石渣释放更多的Ca(OH)_(2),提供碱性环境和钙质组分;改性矿渣/粉煤灰提供硅铝质组分,生成以C-S-H、C-A-S-H凝胶和托贝莫来石为主的水化产物,水化产物与少量原料紧密结合形成稳定结构,使胶凝材料具有良好的力学性能。
The industrial solid waste was modified by fluidization vortex technology.The modified carbide slag was used as alkaline activator,and the modified slag-fly ash was used as silicon-aluminum material to prepare the alkali-activated cementitious materials for all solid waste.The hydration mechanism and microstructure were investigated by means of mercury intrusion porosimetry(MIP),hydration heat measurement,X-ray diffraction(XRD),scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS).The results show that fluidization vortex technology has excellent physical and chemical modification effect on industrial solid waste,which makes the solid waste materials have higher reaction activity.The alkali-activated materials made of modified materials have better mechanical properties and pore size distribution,and their 7 d and 28 d compressive strengths can reach 22.4 MPa and 37.8 MPa,respectively.Modified carbide slag releases more calcium hydroxide,and provides alkaline environment and calcareous components.Modified slag-fly ash provides silicon-aluminum components,and generates hydration products mainly composed of C-S-H,C-A-S-H gel and tobermorite.The hydration products are closely combined with a small amount of raw materials to form a stable structure,which makes the cementitious materials have good mechanical properties.
作者
高英力
孟浩
万红伟
胡新浪
陈楚文
GAO Yingli;MENG Hao;WAN Hongwei;HU Xinlang;CHEN Chuwen(School of Traffic and Transportation Engineering,Changsha University of Science and Technology,Changsha 410114,China;Changsha Wanrong Powder Equipment Technology Co.Ltd.,Changsha 410100,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第5期1739-1747,共9页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51978080)
国家自然科学基金委员会与中国民用航空局联合资助项目(U1833127)
湖南省重点研发计划项目(2021SK2044)。
关键词
固体废弃物
电石渣
流化涡旋
碱激发材料
微观结构
solid waste
carbide slag
fluidization vortex
alkali-activated materials
microstructure
