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

Abstract

Abstract: 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.

Key words: steel slag, specific surface area, grey correlation analysis, strength, hydration

CLC Number:

TU528.04

NAN Xue-li, YANG Lan-lan, TANG Wei-bin, HAN Bo, WANG Chao-jie. Gray correlation analysis of the influence of particle size distribution of steel slag on hydraulic activity of steel slag cement[J]. Journal of Lanzhou University of Technology, 2021, 47(5): 138-143.

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