Details
| Original language | English |
|---|---|
| Article number | 122268 |
| Journal | Materials chemistry and physics |
| Volume | 239 |
| Early online date | 15 Oct 2019 |
| Publication status | Published - 1 Jan 2020 |
| Externally published | Yes |
Abstract
In this paper, the results of the experimental investigation were used to understand the effect of fine meta-halloysite on the reactivity, mechanical and microstructural properties of laterite-based geopolymers. Laterite was replaced by 0, 20, 30 and 50 wt% of meta-halloysite in order to improve the physico-chemical performance. Meta-halloysite was prepared by calcination of natural halloysite at 600 °C. The moduli (molar ratio SiO2/Na2O) of the activating solutions were 1.04, 0.92, and 0.75 with H2O/Na2O = 9.78, 10.45 and 12.04, respectively. The results indicated that calcined laterite has a high specific surface area (43.00 ± 0.12 m2/g), notwithstanding a high average particle size (d50 = 45.20 μm) compared to meta-halloysite with a smaller average particle size (d50 = 8.40 μm) and a specific surface (29.80 ± 0.16 m2/g). The compressive strength of geopolymers increased upon the addition of meta-halloysite from 12 MPa to 45 MPa at 28 days. While the setting time and water absorption decrease with increase in the of meta-halloysite content as well as with increase in Si/Al, Si/Fe, Al/Fe and Na/Al molar ratios used in the synthesis of geopolymers. The use of fine meta-halloysite resulted in better efficiency and improved mechanical performance of synthesized products.
Keywords
- Efflorescence, Geopolymer composite, Laterite, Mechanical strength, meta-Halloysite, Shrinkage
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Materials chemistry and physics, Vol. 239, 122268, 01.01.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Meta-halloysite to improve compactness in iron-rich laterite-based alkali activated materials
AU - Kaze, Cyriaque Rodrigue
AU - Venyite, Paul
AU - Nana, Achile
AU - Juvenal, Deutou Nemaleu
AU - Tchakoute, Herve Kouamo
AU - Rahier, Hubert
AU - Kamseu, Elie
AU - Melo, Uphie Chinje
AU - Leonelli, Cristina
N1 - Funding Information: The authors are grateful to Dr. Mirko Braga and Dr. Pasquale Pansini, from R.S.A. Laboratory, from Ingessil S.r.l. Verona, Italy, for providing the alkaline solutions used in this work. This project also received the contribution of the Academic of Science for the Third World TWAS through the funding 15-079 RG/CHE/AF/AC_I to Dr. Elie Kamseu.
PY - 2020/1/1
Y1 - 2020/1/1
N2 - In this paper, the results of the experimental investigation were used to understand the effect of fine meta-halloysite on the reactivity, mechanical and microstructural properties of laterite-based geopolymers. Laterite was replaced by 0, 20, 30 and 50 wt% of meta-halloysite in order to improve the physico-chemical performance. Meta-halloysite was prepared by calcination of natural halloysite at 600 °C. The moduli (molar ratio SiO2/Na2O) of the activating solutions were 1.04, 0.92, and 0.75 with H2O/Na2O = 9.78, 10.45 and 12.04, respectively. The results indicated that calcined laterite has a high specific surface area (43.00 ± 0.12 m2/g), notwithstanding a high average particle size (d50 = 45.20 μm) compared to meta-halloysite with a smaller average particle size (d50 = 8.40 μm) and a specific surface (29.80 ± 0.16 m2/g). The compressive strength of geopolymers increased upon the addition of meta-halloysite from 12 MPa to 45 MPa at 28 days. While the setting time and water absorption decrease with increase in the of meta-halloysite content as well as with increase in Si/Al, Si/Fe, Al/Fe and Na/Al molar ratios used in the synthesis of geopolymers. The use of fine meta-halloysite resulted in better efficiency and improved mechanical performance of synthesized products.
AB - In this paper, the results of the experimental investigation were used to understand the effect of fine meta-halloysite on the reactivity, mechanical and microstructural properties of laterite-based geopolymers. Laterite was replaced by 0, 20, 30 and 50 wt% of meta-halloysite in order to improve the physico-chemical performance. Meta-halloysite was prepared by calcination of natural halloysite at 600 °C. The moduli (molar ratio SiO2/Na2O) of the activating solutions were 1.04, 0.92, and 0.75 with H2O/Na2O = 9.78, 10.45 and 12.04, respectively. The results indicated that calcined laterite has a high specific surface area (43.00 ± 0.12 m2/g), notwithstanding a high average particle size (d50 = 45.20 μm) compared to meta-halloysite with a smaller average particle size (d50 = 8.40 μm) and a specific surface (29.80 ± 0.16 m2/g). The compressive strength of geopolymers increased upon the addition of meta-halloysite from 12 MPa to 45 MPa at 28 days. While the setting time and water absorption decrease with increase in the of meta-halloysite content as well as with increase in Si/Al, Si/Fe, Al/Fe and Na/Al molar ratios used in the synthesis of geopolymers. The use of fine meta-halloysite resulted in better efficiency and improved mechanical performance of synthesized products.
KW - Efflorescence
KW - Geopolymer composite
KW - Laterite
KW - Mechanical strength
KW - meta-Halloysite
KW - Shrinkage
UR - http://www.scopus.com/inward/record.url?scp=85073369398&partnerID=8YFLogxK
U2 - 10.1016/j.matchemphys.2019.122268
DO - 10.1016/j.matchemphys.2019.122268
M3 - Article
AN - SCOPUS:85073369398
VL - 239
JO - Materials chemistry and physics
JF - Materials chemistry and physics
SN - 0254-0584
M1 - 122268
ER -