What question did this study set out to answer?

To investigate the residual compressive performance, microstructure, and stress–strain behavior of concrete incorporating raw coal gangue aggregates after exposure to temperatures up to 800°C.

August 16, 2026Structural Concrete

Compressive stress–strain responses of concretes containing raw coal gangue aggregates exposed to elevated temperatures

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Authors

XKXuting Kou RWRui Wang HZHui Zhao

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Overview

Experimental study demonstrates severe strength loss at elevated temperatures in raw coal gangue concrete, indicating predictable structural degradation under fire conditions.

Key Points

To investigate the residual compressive performance, microstructure, and stress–strain behavior of concrete incorporating raw coal gangue aggregates after exposure to temperatures up to 800°C.
Fabricated and tested 90 cube and 90 prism concrete specimens with coal gangue aggregate replacement ratios of 0%, 30%, and 50% across two water–cement ratios (0.36 and 0.47).
Subjected specimens to elevated temperatures between 20°C and 800°C, evaluating crack evolution, failure modes, peak stress, elastic modulus, and full stress–strain curves.
Residual peak compressive strength decreased by 80%–90% and elastic modulus decreased by nearly 99% after exposure to 800°C relative to room temperature (20°C).
Peak strain showed a pronounced increase after heating, particularly in the 600°C to 800°C range.
The coal gangue aggregate replacement ratio had limited effect on relative residual peak stress, elastic modulus, or peak strain, allowing development of a normalized stress–strain prediction model.

Cite This Study

Kou et al. (2026) studied this question.

synapsesocial.com/papers/6a817a4cf2fb91fc834ae053 https://doi.org/10.1002/suco.70746

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August 16, 2026Structural Concrete

Compressive stress–strain responses of concretes containing raw coal gangue aggregates exposed to elevated temperatures

View Full Paper

Ask AI

Bookmark

Authors

XKXuting Kou RWRui Wang HZHui Zhao

Discussion

Member takes

Overview

Experimental study demonstrates severe strength loss at elevated temperatures in raw coal gangue concrete, indicating predictable structural degradation under fire conditions.

Key Points

To investigate the residual compressive performance, microstructure, and stress–strain behavior of concrete incorporating raw coal gangue aggregates after exposure to temperatures up to 800°C.
Fabricated and tested 90 cube and 90 prism concrete specimens with coal gangue aggregate replacement ratios of 0%, 30%, and 50% across two water–cement ratios (0.36 and 0.47).
Subjected specimens to elevated temperatures between 20°C and 800°C, evaluating crack evolution, failure modes, peak stress, elastic modulus, and full stress–strain curves.
Residual peak compressive strength decreased by 80%–90% and elastic modulus decreased by nearly 99% after exposure to 800°C relative to room temperature (20°C).
Peak strain showed a pronounced increase after heating, particularly in the 600°C to 800°C range.
The coal gangue aggregate replacement ratio had limited effect on relative residual peak stress, elastic modulus, or peak strain, allowing development of a normalized stress–strain prediction model.

Cite This Study

Kou et al. (2026) studied this question.

synapsesocial.com/papers/6a817a4cf2fb91fc834ae053 https://doi.org/10.1002/suco.70746

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