Details
| Original language | English |
|---|---|
| Pages (from-to) | 184-194 |
| Number of pages | 11 |
| Journal | Applied clay science |
| Volume | 147 |
| Publication status | Published - 2 Aug 2017 |
Abstract
Six different phosphoric acid solutions with molar concentrations 4, 6, 8, 10, 12 and 14 M were prepared by dilution of commercial phosphoric acid in distilled water. The obtained phosphoric acid solutions were used for producing metakaolin-phosphate-based geopolymer cements. These geopolymer cements were obtained by adding each fresh prepared phosphoric acid solution to metakaolin with a mass ratio phosphoric acid solution/metakaolin = 0.80. It was observed in the infrared spectra of phosphoric acid solutions 8, 10, 12 and 14 M, the absorption bands at 875–879 and 949–972 cm− 1 which are assigned to H2PO4 −. The SEM images of geopolymer cements exhibit the presence of berlinite (AlPO4) which is dispersed in the matrix and contributes to enhancing the strength, whereas the geopolymer cements from phosphoric acid solution with 14 M are heterogeneous microstructures. The compressive strength of phosphate-based geopolymer cements was between 36.4 and 93.8 MPa; it increased with increasing the concentration of phosphoric acid solutions up to 10 M. It can be concluded that the most convenient concentration of phosphoric acid solution required for producing phosphate-based geopolymer cements with good mechanical properties is around 10 M.
Keywords
- Berlinite, Compressive strength, Geopolymer cements, Metakaolin, Microstructure, Phosphoric acid solutions
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. 147, 02.08.2017, p. 184-194.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Influence of the molar concentration of phosphoric acid solution on the properties of metakaolin-phosphate-based geopolymer cements
AU - Tchakouté, Hervé K.
AU - Rüscher, Claus H.
AU - Authority, Local Materials
AU - Andreola, Fernanda
AU - Leonelli, Cristina
N1 - Funding information: Hervé Tchakouté Kouamo gratefully acknowledges The World Academy of Sciences (TWAS) for financially support under the grant No. 16-039 RG/CHE/AF/AC_I – FR3240293320.
PY - 2017/8/2
Y1 - 2017/8/2
N2 - Six different phosphoric acid solutions with molar concentrations 4, 6, 8, 10, 12 and 14 M were prepared by dilution of commercial phosphoric acid in distilled water. The obtained phosphoric acid solutions were used for producing metakaolin-phosphate-based geopolymer cements. These geopolymer cements were obtained by adding each fresh prepared phosphoric acid solution to metakaolin with a mass ratio phosphoric acid solution/metakaolin = 0.80. It was observed in the infrared spectra of phosphoric acid solutions 8, 10, 12 and 14 M, the absorption bands at 875–879 and 949–972 cm− 1 which are assigned to H2PO4 −. The SEM images of geopolymer cements exhibit the presence of berlinite (AlPO4) which is dispersed in the matrix and contributes to enhancing the strength, whereas the geopolymer cements from phosphoric acid solution with 14 M are heterogeneous microstructures. The compressive strength of phosphate-based geopolymer cements was between 36.4 and 93.8 MPa; it increased with increasing the concentration of phosphoric acid solutions up to 10 M. It can be concluded that the most convenient concentration of phosphoric acid solution required for producing phosphate-based geopolymer cements with good mechanical properties is around 10 M.
AB - Six different phosphoric acid solutions with molar concentrations 4, 6, 8, 10, 12 and 14 M were prepared by dilution of commercial phosphoric acid in distilled water. The obtained phosphoric acid solutions were used for producing metakaolin-phosphate-based geopolymer cements. These geopolymer cements were obtained by adding each fresh prepared phosphoric acid solution to metakaolin with a mass ratio phosphoric acid solution/metakaolin = 0.80. It was observed in the infrared spectra of phosphoric acid solutions 8, 10, 12 and 14 M, the absorption bands at 875–879 and 949–972 cm− 1 which are assigned to H2PO4 −. The SEM images of geopolymer cements exhibit the presence of berlinite (AlPO4) which is dispersed in the matrix and contributes to enhancing the strength, whereas the geopolymer cements from phosphoric acid solution with 14 M are heterogeneous microstructures. The compressive strength of phosphate-based geopolymer cements was between 36.4 and 93.8 MPa; it increased with increasing the concentration of phosphoric acid solutions up to 10 M. It can be concluded that the most convenient concentration of phosphoric acid solution required for producing phosphate-based geopolymer cements with good mechanical properties is around 10 M.
KW - Berlinite
KW - Compressive strength
KW - Geopolymer cements
KW - Metakaolin
KW - Microstructure
KW - Phosphoric acid solutions
UR - http://www.scopus.com/inward/record.url?scp=85026647164&partnerID=8YFLogxK
U2 - 10.1016/j.clay.2017.07.036
DO - 10.1016/j.clay.2017.07.036
M3 - Article
AN - SCOPUS:85026647164
VL - 147
SP - 184
EP - 194
JO - Applied clay science
JF - Applied clay science
SN - 0169-1317
ER -