Details
| Original language | English |
|---|---|
| Pages (from-to) | 258-268 |
| Number of pages | 11 |
| Journal | Construction and Building Materials |
| Volume | 195 |
| Early online date | 16 Nov 2018 |
| Publication status | Published - 20 Jan 2019 |
| Externally published | Yes |
Abstract
Amorphous fraction, grains defects and the incongruent dissolution of solid solutions (pegmatite, trachyte, and granite) were used to design high strength geopolymer composites with crystalline content in the range of ∼70–85%. The geochemical history of the natural solid solutions affects the dissolution and polycondensation/geopolymerization. These solid solutions were altered with 15, 20, 25 and 30% of metakaolin and activated with alkaline solution. Experimental results (phase evolution, three-point flexural strength, microstructure, mercury intrusion porosimetry and water absorption) indicated that polycondensation/polymerization is enhanced in trachyte, granite and pegmatite based specimens, compared to sand, due to the increase in N-A-S-H secondary phases. The amorphous/crystalline ratio of the solid precursors were used to understand the role of dissolved and undissolved fraction into the strength development of geopolymer composites. It was concluded that high strength geopolymer composites of chemico-mechanical equilibrium can be achieved with solid solutions having reduced fraction of pores volume and pore-size.
Keywords
- Amorphous, Crystalline, Geopolymer composites, Pore-size distribution, Porosity, Solid solution
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Building and Construction
- Materials Science(all)
- General Materials Science
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In: Construction and Building Materials, Vol. 195, 20.01.2019, p. 258-268.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Room-temperature alkaline activation of feldspathic solid solutions
T2 - Development of high strength geopolymers
AU - Nana, Achile
AU - Ngouné, Jean
AU - Kaze, Rodrigue C.
AU - Boubakar, Likiby
AU - Tchounang, Serge K.
AU - Tchakouté, Hervé K.
AU - Kamseu, Elie
AU - Leonelli, Cristina
PY - 2019/1/20
Y1 - 2019/1/20
N2 - Amorphous fraction, grains defects and the incongruent dissolution of solid solutions (pegmatite, trachyte, and granite) were used to design high strength geopolymer composites with crystalline content in the range of ∼70–85%. The geochemical history of the natural solid solutions affects the dissolution and polycondensation/geopolymerization. These solid solutions were altered with 15, 20, 25 and 30% of metakaolin and activated with alkaline solution. Experimental results (phase evolution, three-point flexural strength, microstructure, mercury intrusion porosimetry and water absorption) indicated that polycondensation/polymerization is enhanced in trachyte, granite and pegmatite based specimens, compared to sand, due to the increase in N-A-S-H secondary phases. The amorphous/crystalline ratio of the solid precursors were used to understand the role of dissolved and undissolved fraction into the strength development of geopolymer composites. It was concluded that high strength geopolymer composites of chemico-mechanical equilibrium can be achieved with solid solutions having reduced fraction of pores volume and pore-size.
AB - Amorphous fraction, grains defects and the incongruent dissolution of solid solutions (pegmatite, trachyte, and granite) were used to design high strength geopolymer composites with crystalline content in the range of ∼70–85%. The geochemical history of the natural solid solutions affects the dissolution and polycondensation/geopolymerization. These solid solutions were altered with 15, 20, 25 and 30% of metakaolin and activated with alkaline solution. Experimental results (phase evolution, three-point flexural strength, microstructure, mercury intrusion porosimetry and water absorption) indicated that polycondensation/polymerization is enhanced in trachyte, granite and pegmatite based specimens, compared to sand, due to the increase in N-A-S-H secondary phases. The amorphous/crystalline ratio of the solid precursors were used to understand the role of dissolved and undissolved fraction into the strength development of geopolymer composites. It was concluded that high strength geopolymer composites of chemico-mechanical equilibrium can be achieved with solid solutions having reduced fraction of pores volume and pore-size.
KW - Amorphous
KW - Crystalline
KW - Geopolymer composites
KW - Pore-size distribution
KW - Porosity
KW - Solid solution
UR - http://www.scopus.com/inward/record.url?scp=85056667076&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2018.11.068
DO - 10.1016/j.conbuildmat.2018.11.068
M3 - Article
AN - SCOPUS:85056667076
VL - 195
SP - 258
EP - 268
JO - Construction and Building Materials
JF - Construction and Building Materials
SN - 0950-0618
ER -