Details
| Original language | English |
|---|---|
| Article number | 106148 |
| Journal | Applied clay science |
| Volume | 209 |
| Early online date | 23 May 2021 |
| Publication status | Published - Aug 2021 |
Abstract
The main objective of this work is to investigate the influence of alumina on the compressive strengths and microstructural properties of the acid-based geopolymers using calcined indurated laterite and metakaolin. These raw materials have been replaced by 0, 5, 10, 15 and 20 mass% of calcined bauxite. Phosphoric acid with molarity 10 M was used as a chemical reagent. The compressive strengths of the acid-based geopolymers increase with increasing the calcined bauxite content. Those from the substitution of calcined laterite by calcined bauxite are ranging from 21.45 to 47.95 MPa and higher compared to those from metakaolin (12.55 and 21.97 MPa). TG and DSC curves of all acid-based geopolymers indicate the decomposition of AlPO4.H2O at between 230 and 248 °C to an amorphous phase. In addition to this mineral, those from calcined laterite show the transformation of amorphous FePO4·2H2O at in the range 451–788 °C to the crystalline FePO4. The micrography images of the acid-based geopolymers indicate the formation of dense amorphous geopolymer matrices. It was found that the alumina incorporated in the acid-based geopolymers increases the compressive strengths. The presence of hematite in the calcined laterite leads to the formation of amorphous FePO4·2H2O which could contribute to enhancing exponentially the compressive strengths of the acid-based geopolymers.
Keywords
- Acid-based geopolymers, AlPO·HO, Amorphous FePO·2HO, Bauxite, Laterite, Metakaolin
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geology
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: Applied clay science, Vol. 209, 106148, 08.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Influence of alumina on the compressive strengths and microstructural properties of the acid-based geopolymers from calcined indurated laterite and metakaolin
AU - Tchakouté, Hervé K.
AU - Bewa, Christelle N.
AU - Fotio, Daniel
AU - Dieuhou, Cedric M.
AU - Kamseu, Elie
AU - Rüscher, Claus H.
N1 - Funding Information: Dr. Tchakouté Kouamo Hervé gratefully acknowledges the Alexander von Humboldt-Stiftung for its financial support this work under grant N° KAM/1155741 GFHERMES-P .
PY - 2021/8
Y1 - 2021/8
N2 - The main objective of this work is to investigate the influence of alumina on the compressive strengths and microstructural properties of the acid-based geopolymers using calcined indurated laterite and metakaolin. These raw materials have been replaced by 0, 5, 10, 15 and 20 mass% of calcined bauxite. Phosphoric acid with molarity 10 M was used as a chemical reagent. The compressive strengths of the acid-based geopolymers increase with increasing the calcined bauxite content. Those from the substitution of calcined laterite by calcined bauxite are ranging from 21.45 to 47.95 MPa and higher compared to those from metakaolin (12.55 and 21.97 MPa). TG and DSC curves of all acid-based geopolymers indicate the decomposition of AlPO4.H2O at between 230 and 248 °C to an amorphous phase. In addition to this mineral, those from calcined laterite show the transformation of amorphous FePO4·2H2O at in the range 451–788 °C to the crystalline FePO4. The micrography images of the acid-based geopolymers indicate the formation of dense amorphous geopolymer matrices. It was found that the alumina incorporated in the acid-based geopolymers increases the compressive strengths. The presence of hematite in the calcined laterite leads to the formation of amorphous FePO4·2H2O which could contribute to enhancing exponentially the compressive strengths of the acid-based geopolymers.
AB - The main objective of this work is to investigate the influence of alumina on the compressive strengths and microstructural properties of the acid-based geopolymers using calcined indurated laterite and metakaolin. These raw materials have been replaced by 0, 5, 10, 15 and 20 mass% of calcined bauxite. Phosphoric acid with molarity 10 M was used as a chemical reagent. The compressive strengths of the acid-based geopolymers increase with increasing the calcined bauxite content. Those from the substitution of calcined laterite by calcined bauxite are ranging from 21.45 to 47.95 MPa and higher compared to those from metakaolin (12.55 and 21.97 MPa). TG and DSC curves of all acid-based geopolymers indicate the decomposition of AlPO4.H2O at between 230 and 248 °C to an amorphous phase. In addition to this mineral, those from calcined laterite show the transformation of amorphous FePO4·2H2O at in the range 451–788 °C to the crystalline FePO4. The micrography images of the acid-based geopolymers indicate the formation of dense amorphous geopolymer matrices. It was found that the alumina incorporated in the acid-based geopolymers increases the compressive strengths. The presence of hematite in the calcined laterite leads to the formation of amorphous FePO4·2H2O which could contribute to enhancing exponentially the compressive strengths of the acid-based geopolymers.
KW - Acid-based geopolymers
KW - AlPO·HO
KW - Amorphous FePO·2HO
KW - Bauxite
KW - Laterite
KW - Metakaolin
UR - http://www.scopus.com/inward/record.url?scp=85106378553&partnerID=8YFLogxK
U2 - 10.1016/j.clay.2021.106148
DO - 10.1016/j.clay.2021.106148
M3 - Article
AN - SCOPUS:85106378553
VL - 209
JO - Applied clay science
JF - Applied clay science
SN - 0169-1317
M1 - 106148
ER -