Microstructure and properties of hybrid coal gangue-based alkali-activated cement

Conference paper (2021)

Authors

Bruna J. FRASSON Federal University of Santa Catarina, Brazil
Malik CHERIAF Federal University of Santa Catarina, Brazil
Janaíde C. ROCHA Federal University of Santa Catarina, Brazil
Copyright: © 2021 the authors
Hybrid Compressive strength Sorptivity Alkali-activated Coal gangue
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Published Date

29-04-2021

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Abstract

Addition of Portland cement in low-calcium aluminosilicate-based alkali-activated materials can provide rapid hardening at room temperature, thus modifying microstructure and mechanical properties. In the present study, the effect of Portland cement addition on alkali-activated materials, cured at room temperature, was analysed by mechanical strength test, FT-IR and electrochemical impedance spectroscopy. The results showed samples hardening at room temperature after 24 hours and compressive strength of 26 MPa (7 days) for 5% of OPC addition. Hybrid alkali-activated cements presented higher sorptivity and lower electrical resistance than alkali-activated cement without OPC addition which can be related to more connected pores. The analysis of EIS spectrum highlights continued formation of microstructure over the ages of alkali-activated cement and can be related to mechanical properties and sorptivity.