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Characterization and properties of elephant grass ashes as supplementary cementing material in pozzolan/Ca(OH)2 pastes

AuthorsNakanishi, E.Y.; Frías, Moisés ; Martínez-Ramírez, S. ; Santos, Sergio F.; Rodrigues, M. S.; Rodríguez, O.; Savastano, Holmer
KeywordsThermal activation
Elephant grass
Lime pastes
Alternative binder
Agro-industrial waste
Issue Date2014
CitationConstruction and Building Materials 73: 391- 398 (2014)
AbstractThis work presents the behavior of two elephant grass ashes, as pozzolans, elephant grass cameroon (EGC) and napier (EGN), calcined under controlled conditions (700 °C). The ashes were initially submitted to a chemical treatment with HCl in order to reduce the potassium content. Both ashes showed high pozzolanic activity after 7 days of curing, with at least 85% of fixed lime. The thermogravimetric and micro-Raman analysis in elephant grass ashes/Ca(OH)2 pastes confirmed that the main hydrated phases during the pozzolanic reaction consisted of CSH gels, by the weight loss between 60 and 300 °C in TG analysis and the band at 680 cm-1 in Raman spectrums. Based on the achieved results, it is possible to conclude that elephant grass ashes can be used as supplementary cementing materials. © 2014 Elsevier Ltd.
Identifiersdoi: 10.1016/j.conbuildmat.2014.09.078
issn: 0950-0618
Appears in Collections:(IETCC) Artículos
(CFMAC-IEM) Artículos
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