What does this research mean for the field?

Fly ash and ground granulated blast furnace slag blended mortars exhibit superior thermal stability and residual strength retention at elevated temperatures up to 600 °C compared to traditional Portland cement, despite lower ambient compressive strength and severe degradation at 800 °C. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate the thermal stability, residual compressive strength, and microstructural degradation of mortar incorporating fly ash and ground granulated blast furnace slag exposed to elevated temperatures.

August 23, 2026Discover Concrete and CementOpen Access

Experimental study on fly ash slag-based mortar performance under elevated temperatures

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Authors

BSBiresh Kumar SarkarMinistry of AYUSH PGPartha GhoshJadavpur University

Discussion

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Implication

Experimental study demonstrates improved thermal stability and residual strength in fly ash-slag blended mortar, suggesting sustainable alternatives for fire-resistant construction.

Key Points

To evaluate the thermal stability, residual compressive strength, and microstructural degradation of mortar incorporating fly ash and ground granulated blast furnace slag exposed to elevated temperatures.
Tested mortar mixes with a water-to-binder ratio of 0.485 and binder-to-sand ratio of 1:2.75, comparing a 100% Portland pozzolanic cement control to fly ash mixes (30–70%) and fly ash–slag blends (10–50% fly ash with a constant 20% GGBS).
Cured specimens for 7 and 28 days before measuring compressive strength at ambient temperature and after heating to 400 °C, 600 °C, and 800 °C.
Higher fly ash content decreased ambient compressive strength by up to ~54% but yielded a strength gain of up to ~33.7% following exposure to 400 °C.
Incorporating 20% GGBS enhanced early-age strength and reduced thermal degradation at 400–600 °C, while all mixtures suffered ~81.5% average strength loss at 800 °C due to microcracking and hydration product decomposition.

Cite This Study

Sarkar et al. (2026) studied this question.

synapsesocial.com/papers/6a8aad417677a34114445745 https://doi.org/10.1007/s44416-026-00110-3

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August 23, 2026Discover Concrete and CementOpen Access

Experimental study on fly ash slag-based mortar performance under elevated temperatures

View Full Paper

Ask AI

Bookmark

Authors

BSBiresh Kumar SarkarMinistry of AYUSH PGPartha GhoshJadavpur University

Discussion

Member takes

Implication

Experimental study demonstrates improved thermal stability and residual strength in fly ash-slag blended mortar, suggesting sustainable alternatives for fire-resistant construction.

Key Points

To evaluate the thermal stability, residual compressive strength, and microstructural degradation of mortar incorporating fly ash and ground granulated blast furnace slag exposed to elevated temperatures.
Tested mortar mixes with a water-to-binder ratio of 0.485 and binder-to-sand ratio of 1:2.75, comparing a 100% Portland pozzolanic cement control to fly ash mixes (30–70%) and fly ash–slag blends (10–50% fly ash with a constant 20% GGBS).
Cured specimens for 7 and 28 days before measuring compressive strength at ambient temperature and after heating to 400 °C, 600 °C, and 800 °C.
Higher fly ash content decreased ambient compressive strength by up to ~54% but yielded a strength gain of up to ~33.7% following exposure to 400 °C.
Incorporating 20% GGBS enhanced early-age strength and reduced thermal degradation at 400–600 °C, while all mixtures suffered ~81.5% average strength loss at 800 °C due to microcracking and hydration product decomposition.

Cite This Study

Sarkar et al. (2026) studied this question.

synapsesocial.com/papers/6a8aad417677a34114445745 https://doi.org/10.1007/s44416-026-00110-3

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