Thermal behavior of carbonated γ-C2S compacts subjected to high temperature : Mechanical properties and phase evolution

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Detail(s)

Original languageEnglish
Article number138799
Journal / PublicationConstruction and Building Materials
Volume451
Online published22 Oct 2024
Publication statusPublished - 15 Nov 2024

Abstract

In this study, carbonated γ-C2S compacts were subjected to CO2 curing at partial pressures of 0.02 MPa (P-0.02) and 0.3 MPa (P-0.3) prior to exposure to high temperatures (300–800 ℃) for investigation. The carbonated γ-C2S compacts exhibited constant strength at both 300 °C and 400 °C, with the presence of stable polymorphic CaCO3. At 500 ℃, the strength of P-0.02 increased by 20 %, while a more notable growth of 50 % was observed in P-0.3 associated to the presence of more aragonite (33.4 %). Beyond 800°C, the mechanical properties of P-0.02 and P-0.3 decreased to 16.6 % and 20.3 % of their original strength, respectively. With the decomposition of CaCO3, amorphous lime and β-C2S were generated, the latter indicated a simultaneous reaction between lime and silica gel occurred at high temperatures. Understanding the performance of carbonated γ-C2S compacts after exposure to high temperatures is crucial for ensuring the fire safety of this material used in construction applications. © 2024 Elsevier Ltd.

Research Area(s)

  • Aragonite, Calcite, Carbonated γ-C2S, Carbonation products, High-temperature performance