Work

Microstructure and mechanical properties of geopolymers with different dolomitic lime contents

Year: 2024

Type: article

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.

Source: Revista IBRACON de Estruturas e Materiais

DOI: 10.1590/s1983-41952025000100001

Authors: Allan Guimarães Borçato, Neusa Aparecida Munhak Beltrame, Tassiane Apolinário de Oliveira, Ronaldo Alves de Medeiros-Junior

Institutions: Instituto Federal de Educação, Ciência e Tecnologia de Santa Catarina, Universidade Federal do Paraná

Language: English

Topic: Concrete and Cement Materials Research

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: diamond