碱当量对碱激发矿渣胶凝材料抗压强度及微观结构的影响

Effect of Alkali Equivalent on Compressive Strength and Microstructure of Alkali-Activated Slag Cementitious Material

摘要: 为探讨碱当量对碱激发矿渣胶凝材料抗压强度及微观结构的影响；本研究借助X射线衍射仪和扫描电镜对碱激发矿渣胶凝材料物相组成与微观结构形貌进行表征。结果表明：当模数为1.5，碱当量分别为4%、5%、6%、7%、8%时，随碱当量的增加，碱激发矿渣胶凝材料的凝结时间呈先减后增趋势，抗压强度呈先增后减趋势。其中碱当量为6%时，碱激发矿渣胶凝材料初终凝凝结时间最小，分别为33 min、69 min；28 d的抗压强度最大，为65.3 MPa。由微观分析可知，碱激发矿渣胶凝材料的水化产物为C-(A)-S-H凝胶，且碱当量为6%时，碱激发矿渣胶凝材料生成的水化产物较多，微观结构形貌结构致密。

Abstract: In order to investigate the effect of alkali equivalent on the compressive strength and microstructure of alkali-activated slag gelling materials, the phase composition and microstructure of alkali-activated slag gelling materials were characterized by X-ray diffractometer and scanning electron microscope. The results show that when the modulus is 1.5 and the alkali equivalent is 4%, 5%, 6%, 7% and 8% respectively, the setting time of the alkali-activated slag cementification material decreases first and then increases, and the compressive strength increases first and then decreases with the increase of the alkali equivalent. When the alkali equivalent is 6%, the initial and final setting time of alkali-activated slag cementification material is the smallest, which are 33 min and 69 min respectively. The compressive strength of 28 d was the highest, 65.3 MPa. It can be seen from the microscopic analysis that the hydration product of the alkali-activated slag cementing material is C-(A)-S-H gel, and when the alkali equivalent is 6%, the hydration products generated by the alkali-activated slag cementing material are more and the microstructure morphology and structure are dense.