Origin of the pozzolanic effect of rice husks

Rice husk ash has been used in many countries as a low cost concrete admixture because of its role as a filler and a pozzolan. A study is made of an ash produced in Senegal to establish the existence and origin of silica. Two calcinated rice husk ashes were studied. X-Ray diffraction analysis reveal...

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Bibliographic Details
Published inConstruction & building materials Vol. 14; no. 8; pp. 419 - 423
Main Authors Jauberthie, R., Rendell, F., Tamba, S., Cisse, I.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2000
Subjects
Lightweight concrete
Pozzolans
Rice husk ash
SEM
X-Ray diffraction
Rice husk ash
Pozzolans
SEM
X-Ray diffraction
Lightweight concrete
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Summary:Rice husk ash has been used in many countries as a low cost concrete admixture because of its role as a filler and a pozzolan. A study is made of an ash produced in Senegal to establish the existence and origin of silica. Two calcinated rice husk ashes were studied. X-Ray diffraction analysis revealed the presence of quartz whose origin may be attributed to contamination and/or re-crystallisation of silica in the calcination. Amorphous silica was detected by scanning electron microscopy and microanalysis, its presence is concentrated on the interior and exterior surfaces of the uncalcinated husk which may promote a pozzolanic action on the surface of the husk and therefore enable its use in lightweight concrete.
ISSN:0950-0618
1879-0526
DOI:10.1016/S0950-0618(00)00045-3