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Microstructure and mechanical properties of geopolymers with different dolomitic lime contents

2024; Instituto Brasileiro do Concreto (IBRACON); Volume: 18; Issue: 1 Linguagem: Inglês

10.1590/s1983-41952025000100001

1983-4195

Allan Guimarães Borçato, Neusa Aparecida Munhak Beltrame, Tassiane Apolinário de Oliveira, Ronaldo A. Medeiros-Junior,

Clay minerals and soil interactions

Abstract This study investigated the effect of dolomitic lime incorporation on the microstructure and mechanical properties of metakaolin-based geopolymers activated by alkaline solution. Five geopolymer mixtures were prepared with the addition of 0.0%, 2.5%, 5.0%, 7.5%, and 10.0% dolomitic lime. The microstructure of the geopolymers was evaluated by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction analyses (XRD). The compressive strength of the mixtures ranged between 53.2 and 63.0 MPa after 28 days of ambient curing. SEM/EDS analyses showed that the main phases formed were the N-A-S-H gel together with the C-A-S-H and N-M-A-S-H gels in the mixtures with dolomitic lime. In summary, the results showed that the incorporation of dolomitic lime can significantly improve the microstructure and properties of geopolymers.