Work

Effect of elevated temperature on strength and phase stability of geopolymers from fly ash, bagasse ash, and calcium carbide residue

Year: 2025

Type: article

Abstract: This study evaluates the thermal resistance of alkali-activated geopolymers synthesized from industrial by-products—fly ash (FA), bagasse ash (BA), and calcium carbide residue (CR). The materials were activated using 5 M NaOH and sodium silicate, then subjected to elevated temperatures of 100 °C, 200 °C, 400 °C, and 600 °C for 60 min. Compressive strength, water absorption, and thermogravimetric weight loss were assessed to determine thermal performance. The 0.67FA–0.16BA–0.16CR mix achieved the highest strength of 28.24 MPa at ambient conditions and retained better stability after thermal exposure. At 600 °C, strength deterioration was observed across all mixes, linked to increased porosity and decomposition of gel structures. XRD and TGA analyses confirmed phase transformations and CO₂ release between 150 °C and 600 °C. The results highlight the critical role of precursor composition in enhancing the mechanical and thermal performance of sustainable geopolymer materials.

Source: Results in Engineering

DOI: 10.1016/j.rineng.2025.108606

Authors: Teerapon Saowapan, Rattapon Somna, Tinnapat Pluemchaiyaphum, Kiatsuda Somna

Institution: Rajamangala University of Technology Isan

Language: English

Topic: Concrete and Cement Materials Research

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: gold

Estimated APC paid: $1,940