Effects of Fineness and Water-Binder Ratio on Carbon Mineralization Performance of Ladle Furnace Slag Carbon-Negative Binder

doi:10.16552/j.cnki.issn1001-1625.2024.1628

Abstract

Abstract: The low hydraulic activity of ladle furnace slag (LFS) is the limitation of utilization as the cementitious material. This study researched the effects of different fineness and water-binder ratios on carbonation activity of LFS and the compressive strength, mineral phase composition, and microstructure of carbonated samples. The results show that the CO₂ uptake and degree of carbonation is 17.16% and 39.6% respectively, and the compressive strength of carbonated samples is 213.03 MPa at a fineness of 777.8 m²/kg and a water-binder ratio of 0.100. The carbonation activity of LFS is significantly enhanced with the increase of fineness, but there is not an obvious increase when the fineness exceeds 642.6 m²/kg. And the increase of fineness results in a reduce of crystallinity of calcite generated by carbonation reaction, but promotes a considerable generation of carbonation products, which contributes to the improvement of compressive strength. With the increase of water-binder ratio, the carbonation activity of LFS and the compressive strength of carbonated samples are both foremost increased and then decreased. And at a water-binder ratio of 0.100, the amount of calcite generated in carbonation reaction is more, the crystal size of calcite is larger and the crystallinity of calcite is better.

Key words: ladle furnace slag, carbon-negative binder, carbon mineralization performance, fineness, water-binder ratio

CLC Number:

TU521

XIANG Weiheng, LIU Jun, HU Cheng, CHEN Ping, MA Xiaopeng, PENG Yingjie. Effects of Fineness and Water-Binder Ratio on Carbon Mineralization Performance of Ladle Furnace Slag Carbon-Negative Binder[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(7): 2549-2556.

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