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The aim is to evaluate the durability of geopolymer mortars using waste clay brick powder under sulphate exposure.

May 22, 2026Scientific ReportsOpen Access

Sulphate resistance of geopolymer mortars incorporating waste clay brick powder

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Randomized trial examines sulphate resistance in geopolymer mortars, indicating better durability with waste clay brick powder.

The aim is to evaluate the durability of geopolymer mortars using waste clay brick powder under sulphate exposure.
Geopolymer mortars with 0-60% waste clay brick powder content were assessed.
Mortars were immersed in 5% Na₂SO₄ solution for 180 days.
Microstructural analyses conducted using X-ray diffraction and scanning electron microscopy.
Compressive strength peaked at 69 MPa after 180 days for W40, compared to 63 MPa for control.
Compressive strength reduction ranged from 10 to 19% post-exposure for all mixes.
W40 exhibited 0.0516% expansion against 0.0632% for control and 0.0757% for W60.

Sharmin et al. (2026) studied this question.

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