Reaction kinetics and early strength development of alkali-activated recycled red-brick composite

Authors

  • Petr Miarka Czech Academy of Sciences, Institute of Physics of Materials, Žižkova 22, 616 00 Brno, Czech Republic
  • Lukáš Procházka Technical University of Ostrava, Faculty of Civil Engineering, Ludvíka Podéště 1875/17, 708 00 Ostrava-Poruba, Czech Republic
  • Vlastimil Bílek Technical University of Ostrava, Faculty of Civil Engineering, Ludvíka Podéště 1875/17, 708 00 Ostrava-Poruba, Czech Republic

DOI:

https://doi.org/10.14311/APP.2026.59.0142

Keywords:

reaction kinetics, hydration heat, non-cementitious binder

Abstract

Six alkali-activated (AAC) mortars were studied, prepared with ground blast furnace slag (GBFS) and KOH, with sand fully replaced by recycled red brick aggregate (RBA). The raw materials were characterised by X-ray fluorescence, and reaction kinetics were examined using isothermal calorimetry. Hydration heat release and cumulative heat flow were compared with ordinary Portland cement (OPC) mortars. Mechanical properties of AAC mortars were evaluated against OPC references, and the OPC hydration heat curve was modelled. The study provides a direct comparison between AAC and OPC systems.

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Published

2026-08-27

Issue

Vol. 59 (2026): Modern Concrete and Composites 2025

Section

Articles

License

Copyright (c) 2026 Petr Miarka, Lukáš Procházka, Vlastimil Bílek

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

Miarka, P., Procházka, L., & Bílek, V. (2026). Reaction kinetics and early strength development of alkali-activated recycled red-brick composite. Acta Polytechnica CTU Proceedings, 59, 142–146. https://doi.org/10.14311/APP.2026.59.0142