Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 227, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.116689
Keywords
Volcanic ash; Cassava peel ash; Replacement; Geopolymer; Synergistic effect; Compressive strength; Efflorescence
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Funding
- Bureau Afrique Centrale et des Grands Lacs de l'Agence Universitaire de la Francophonie (BACGL-AUF) [NS0020//10406]
- The World Academy of Sciences (TWAS) [13-018 RG/CHE/AF/AC G-UNESCO FR: 3240277723]
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This study assesses the replacement of low reactive volcanic ash by ashes of an agro-waste matter (cassava peel) within the range of 0-30% by mass in geopolymer synthesis. Gradual replacement of volcanic ash decreases the initial setting time and increases the compressive strength to about 64 and 733% respectively. Also, it turns down the magnitude of efflorescence. After immersion in 5% solution of sulphuric acid, the surface of all specimens remains structurally intact. Cassava peel ash behaves as an additional precursor that brings synergistic effect to volcanic ash during alkaline activation. (C) 2019 Elsevier Ltd. All rights reserved.
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