High Temperature Resistance of Accelerated Carbonated Steel Slag Blocks

Abstract

Abstract: In order to develop steel slag for high temperature environments and improve the comprehensive utilization rate as much as possible, compressive strength, mineral phases, and microstructure of accelerated carbonated steel slag blocks cured with different high temperatures were investigated in this study by strength test, TGA, XRD and SEM. The results show that the compressive strength of accelerated carbonated steel slag blocks is improved when exposed to high temperature between 200 ℃ to 600 ℃, and the highest compressive strength of 72.4 MPa is obtained at 400 ℃, which is 20.5% higher than the initial compressive strength. The content of calcium silicate at 400 ℃ is reduced, C-S-H net structure is observed, which confirmed the further hydration of calcium silicate. The hydration product enhances the matrix connection, resulting in strength improvement. The performance of steel slag degrades at 800 ℃ and the strength reduces 90.7% of initial strength. The mass fraction of calcium carbonate reduces from 24.1% to 1.6%. The total mass loss reaches 19.67% and the water absorption improves significantly. Cracks through the blocks are also investigated. The high temperature resistance of accelerated carbonated steel slag blocks is better than cement-based materials, but the advantage is not obvious when the temperature reaches 800 ℃.

Key words: steel slag, accelerated carbonation, high temperature resistance, compressive strength, mineral composition, microstructure

CLC Number:

TU521.4

ZHONG Xinzhuo, LI Lufan, JIANG Yi, LING Tungchai. High Temperature Resistance of Accelerated Carbonated Steel Slag Blocks[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3677-3684.

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