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Updated: May 28, 2026
11:14
Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
Early-Stage Hydration and Product Evolution in Calcium Hydroxide-Activated Lithium Slag.
Baoliang Li1,2, Liying Shi1, Hongrui Shang1
1Faculty of Architecture and Civil Engineering, Huaiyin Institute of Technology, Huai'an 223001, China.
Gels (Basel, Switzerland)
|May 27, 2026
Summary
Lithium slag (LS) activated by calcium hydroxide (CH) shows high early reactivity, forming ettringite and contributing to a sustainable cementitious material with good 28-day strength.
Area of Science:
- Materials Science
- Civil Engineering
- Geochemistry
Background:
- Cement production contributes significantly to global CO2 emissions.
- Developing sustainable alternatives to ordinary Portland cement is crucial.
- Lithium slag (LS) is an industrial byproduct with potential cementitious properties.
Purpose of the Study:
- To investigate the early-age hydration mechanism of lithium slag (LS) activated by calcium hydroxide (CH).
- To analyze the phase assemblage, microstructure, and properties of LS-CH blends.
- To evaluate the potential of LS-CH blends as sustainable cementitious materials.
Main Methods:
- Isothermal calorimetry (ICC) to monitor early hydration.
- Comparative analysis of phase composition, microstructure, and macroscopic properties.
- Standard and steam curing conditions were employed.
Main Results:
- LS exhibited high early reactivity within 9 hours, primarily due to ettringite formation.
- Two exothermic peaks were observed, linked to ettringite, C-S-H, and CaCO3 formation.
- The hydrated paste contained abundant AFt, CaCO3 polymorphs, unreacted LS, and low Ca/Si C-S-H gel.
- The LS-CH system resulted in a coarser pore structure but achieved notable 28-day compressive strength.
Conclusions:
- Calcium hydroxide effectively activates lithium slag for cementitious applications.
- The hydration process involves complex reactions including ettringite and carbonate formation.
- LS-CH blends demonstrate potential as eco-friendly cementitious materials with promising mechanical properties.
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