Feasibility of low-carbon electrolytic manganese residue-based supplementary cementitious materials.
- Publisher:
- ELSEVIER
- Publication Type:
- Journal Article
- Citation:
- Sci Total Environ, 2023, 883, pp. 163672
- Issue Date:
- 2023-07-20
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| Filename | Description | Size | |||
|---|---|---|---|---|---|
| Feasibility of low-carbon electrolytic manganese residue-based supplementary cementitious materials.pdf | Accepted version | 6.01 MB |
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In this work, the electrolytic manganese residues (EMR) were used as sulfate activators for fly ash and granulated blast-furnace slag to fabricate highly reactive supplementary cementitious materials (SCMs). The findings promote the implementation of a win-win strategy for carbon reduction and waste resource utilisation. The effects of EMR dosing on the mechanical properties, microstructure and CO2 emission of the EMR-doped cementitious materials are investigated. The results show that low dosing EMR (5 %) produced more ettringite, fostering early strength development. The fly ash-doped mortar strength increases and then decreases with the addition of EMR from 0 to 5 % to 5-20 %. It was found that blast furnace slag contributes less to strength than fly ash. Moreover, the sulfate activation and the micro-aggregate effect compensate for the EMR-induced dilution effect. The significant increase in strength contribution factor and direct strength ratio at each age verifies the sulfate activation of EMR. The lowest EIF90 value of 5.4 kg∙MPa-1∙m3 was achieved for the fly ash-doped mortar with 5 % EMR, suggesting the synergistic effect between fly ash and EMR optimised the mechanical properties while maintaining lower CO2 emissions.
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