Communication Dans Un Congrès Année : 2023

POTENTIAL OF ASH FROM PELAGIC SARGASSUM spp. AS STABILISER IN EARTH-BASED MATERIALS: PHYSICAL, CHEMICAL AND THERMAL ASSESSMENT

Résumé

This study evaluates the effect of the pelagic Sargassum desalination process on its physico-chemical and thermal properties as well as on the chemical and mineral composition of the ash. Fresh pelagic Sargassum was subjected to two cycles of immersion in water at 40 min each to dissolve excess salt in the water. Characterisation of the raw and desalted Sargassum shows an increase in volatile matter from 43.74% to 50.82%, fixed carbon from 3.29% to 8.34% and porosity from 84.59% to 86.18%, while there is a reduction in ash content from 28.44% to 17.25% after desalination. Furthermore, the TGA and DTG results show a slight reduction in the degradation temperature, which is associated with a reduction in the amount of residual char from 35% to 27%. The results of the XRF analysis of the Sargassum ash showed a very low alumiosilica content (SiO3+Al2O3 < 4%), but a significant increase in CaO content after desalination from 21.96% to 50.17% while K and Cl contents decreased to 48% for K and 73% for Cl. These chemical and mineral analyses of the ash suggest the possibility of using desalinated Sargassum ash as a partial substitute for cementitious materials for soil stabilisation to reduce greenhouse gas emissions from cement production.

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Dates et versions

hal-04650675 , version 1 (16-07-2024)

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  • HAL Id : hal-04650675 , version 1

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Ketty Bilba, Stanislas Tido Tiwa, Cristel Onésippe Potiron, Marie-Ange Arsene. POTENTIAL OF ASH FROM PELAGIC SARGASSUM spp. AS STABILISER IN EARTH-BASED MATERIALS: PHYSICAL, CHEMICAL AND THERMAL ASSESSMENT. 6th INTERNATIONAL CONFERENCE ON NATURAL FIBERS, Jun 2023, Funchal (Madeira Island), Portugal. ⟨hal-04650675⟩
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