钢渣粒度分布对钢渣水泥水化特性影响的灰度分析

利用机械激发的原理,从强度与Ca(OH)₂含量两个方面,研究不同球磨时间下钢渣粉的粒度特性以及比表面积对钢渣水泥胶砂水化性能的影响,同时采用灰色关联分析方法探讨钢渣颗粒粒径与钢渣水泥胶砂强度和水化程度的影响规律.结果表明:球磨时间增加,钢渣比表面积增大,活性随之增强;通过DTG热分析发现钢渣的比表面积的变化会影响水化产物Ca(OH)₂结晶和晶体生长速率;钢渣粉中10~20μm粒级对钢渣水泥强度促进作用最大,5~10 μm粒级对钢渣水泥28 d Ca(OH)₂含量促进作用最大,因此增加5~20 μm范围的钢渣颗粒含量,有利于提高钢渣活性.

Gray correlation analysis of the influence of particle size distribution of steel slag on hydraulic activity of steel slag cement

Based on the principle of mechanical activation, the effects of particle size distribution and specific surface area of steel slag powderfor different grinding time on the hydration properties of steel slag cement mortar were studied from two aspects of strength and Ca(OH)₂ content. And the influence of particle size of steel slag on the strength and hydration performance of steel slag cement mortar was researched by the gray relational analysis method. The results show that the specific surface area of steel slag and its activity increase with the grinding time; DTG thermal analysis shows that the specific surface area of steel slag affects the crystallization and crystal growth rate of Ca(OH)₂; Slag powder particles with the sizes of 10~20 μm have the greatest effect on the strength of steel slag cementand those with the sizes of 5~10 μm play a catalytic role in the content of Ca(OH)₂ at the 28th day. Therefore, increasing the content of steel slag particles in the range of 5~20 μm is beneficial to the activity of steel slag.