钢渣-粉煤灰-脱硫石膏胶凝协同作用研究

Study on the Synergistic Effect of Steel Slag-Fly Ash-Desulfurized Gypsum

以抗压强度作为主要指标研究了粉煤灰、钢渣和脱硫石膏三种工业固废的协同胶凝效应,并采用XRD和SEM分析手段对复合胶凝试块的矿物组成和微观形貌进行分析以明确其协同作用机理。研究表明:不同胶凝体系的协同效应依次为三元体系、二元体系和一元体系。XRD分析发现,三元体系胶凝试块具有更明显的硅铝酸盐水化产物衍射峰,并且多出了钙矾石的衍射峰。SEM分析表明,三元体系胶凝试块呈现针杆状的钙矾石晶体与水化硅酸钙凝胶交错生长,形成致密网络状结构的微观形貌。

The synergistic gelling effect of fly ash,steel slag and desulphurized gypsum was studied using compressive strength as the main index.XRD and SEM were used to analyze the mineral composition and micromorphology of the composite gelling test block in order to clarify the synergistic mechanism.The results show that the synergistic effect of different gelling systems is ternary system>binary system>monadic system.XRD analysis shows that the ternary gel test block has more obvious diffraction peaks of silicoaluminate brine products and more ettringite diffraction peaks.SEM analysis showed that the ternary cementing block showed the interleaved growth of needle-shaped ettringite crystal and hydrated calcium silicate gel,forming a microscopic morphology of dense network structure.