摘要
为适应“十四五”规划中大宗固废资源化利用的重大需求,研究创新性地构建了煤矸石-钢渣-气化渣三元固废协同体系,开展碱激发胶凝材料制备及性能优化研究。文中通过正交试验方法系统研究了碱模数与碱激发剂掺量对不同龄期胶凝材料无侧限抗压强度的影响,并采用X射线衍射(X-Ray Diffraction,XRD)和扫描电镜(Scanning Electron Microscope,SEM)对水化产物与微观结构进行表征。结果表明碱模数与碱掺量对强度影响显著,其主次顺序为碱模数>碱掺量。当水玻璃模数为1.2、掺量为8%时,28 d无侧限抗压强度达到7.653 MPa,较未激发组提升540.95%。微观分析表明,碱激发促使Si—O和Al—O键断裂,生成C-S-H和C-A-S-H凝胶,有效填充孔隙,增强材料致密性与整体性。研究可为多元固废协同资源化与低碳胶凝材料开发提供理论依据与技术支撑。
To meet the significant demand for bulk solid waste valorization outlined in the 14th Five-Year Plan,this study innovatively established a ternary solid waste synergistic system composed of coal gangue,steel slag,and gasification slag,and investigated the preparation and performance optimization of alkali-activated cementitious materials.Using an orthogonal experimental design,the effects of alkali modulus and alkali activator dosage on the unconfined compressive strength of the cementitious materials at different curing ages were systematically evaluated.The hydration products and microstructure were characterized by X-Ray Diffraction(XRD)and scanning electron microscopy(SEM).The results show that both the alkali modulus and activator dosage significantly influence the material strength,with the alkali modulus being the dominant factor.When the water glass modulus was 1.2 and the dosage was 8%,the 28-day unconfined compressive strength reached 7.653 MPa,representing a 540.95%increase compared to the non-activated group.Microstructural analysis indicates that alkali activation promotes the cleavage of Si—O and Al—O bonds,leading to the formation of C-S-H and C-A-S-H gels,which effectively fill pores and enhance the material s density and integrity.This study provides both theoretical insights and technical support for the synergistic valorization of multiple solid wastes and the development of low-carbon cementitious materials.
作者
刘梦源
邱健
LIU Mengyuan;QIU Jian(School of Urban Planning and Municipal Engineering,Xi an Polytechnic University,Xi an 710699,China)
出处
《低温建筑技术》
2026年第1期65-69,共5页
Low Temperature Architecture Technology
关键词
工业固废
胶凝材料
煤矸石
碱激发剂
正交试验
碱模数
industrial solid waste
cementitious material
coal gangue
alkali activator
orthogonal test
alkali modulus
