Details
| Original language | English |
|---|---|
| Article number | 105773 |
| Journal | Applied clay science |
| Volume | 196 |
| Early online date | 24 Jul 2020 |
| Publication status | Published - Oct 2020 |
| Externally published | Yes |
Abstract
In this paper, four samples of meta-halloysite from widely available Cameroon halloysite clay calcined at 600, 650, 700 and 750 °C, respectively, and the resultant geopolymer binders were systematically characterized. Isothermal conduction calorimetry (ICC) was used to measure the reaction kinetics of meta-halloysite geopolymers at room temperature during 48 h. The increase in reaction rate and in heat released correlates with the thermal activation temperature. It was typically found that the increase of thermal activation temperature (from 600 to 750 °C) enhances the amorphous or reactive phase content from MH600 to MH750 samples. This results in an improvement of rheological behaviour and setting time of the fresh meta-halloysite based geopolymer pastes. The hardened meta-halloysite based geopolymers were amorphous, compact and dense according to X-ray diffractometry (XRD) and Scanning Electron Microscopy (SEM). The compressive strength of resultant products increased with the activation temperature, up to 750 °C (74 MPa at 180 days). Therefore, the best temperature in view of the highest strength of meta-halloysite geopolymer cured at room temperature is 750 °C, although the lower increase in mechanical performance (7.3%) gained between GPMH700 and GPMH750 is limited. Thus, thermally activated halloysite clay appears to be a promising candidate for geopolymer synthesis.
Keywords
- Geopolymer, Halloysite, Kinetic reaction, Mechanical properties, Meta-halloysite, Rheology, Thermal activation
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. 196, 105773, 10.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Reaction kinetics and rheological behaviour of meta-halloysite based geopolymer cured at room temperature
T2 - Effect of thermal activation on physicochemical and microstructural properties
AU - Kaze, Cyriaque Rodrigue
AU - Alomayri, Thamer
AU - Hasan, Assaedi
AU - Tome, Sylvain
AU - Lecomte-Nana, Gisèle Laure
AU - Nemaleu, Juvenal Giogetti Deutou
AU - Tchakoute, Herve Kouamo
AU - Kamseu, Elie
AU - Melo, Uphie Chinje
AU - Rahier, Hubert
N1 - Funding Information: RCK gratefully acknowledges Department of Physics, Umm Al-Qura University, Makkah 21955, Saudi Arabia for running characterization of the geopolymers products made in this research paper. The authors are grateful to Ingessil S.r.l. Verona, Italy, for providing sodium silicate used. Thankful would also be addressed to Mr. Micha?l LACROIX for his helping during the Rheological measurements at the University of Limoges during my internship.
PY - 2020/10
Y1 - 2020/10
N2 - In this paper, four samples of meta-halloysite from widely available Cameroon halloysite clay calcined at 600, 650, 700 and 750 °C, respectively, and the resultant geopolymer binders were systematically characterized. Isothermal conduction calorimetry (ICC) was used to measure the reaction kinetics of meta-halloysite geopolymers at room temperature during 48 h. The increase in reaction rate and in heat released correlates with the thermal activation temperature. It was typically found that the increase of thermal activation temperature (from 600 to 750 °C) enhances the amorphous or reactive phase content from MH600 to MH750 samples. This results in an improvement of rheological behaviour and setting time of the fresh meta-halloysite based geopolymer pastes. The hardened meta-halloysite based geopolymers were amorphous, compact and dense according to X-ray diffractometry (XRD) and Scanning Electron Microscopy (SEM). The compressive strength of resultant products increased with the activation temperature, up to 750 °C (74 MPa at 180 days). Therefore, the best temperature in view of the highest strength of meta-halloysite geopolymer cured at room temperature is 750 °C, although the lower increase in mechanical performance (7.3%) gained between GPMH700 and GPMH750 is limited. Thus, thermally activated halloysite clay appears to be a promising candidate for geopolymer synthesis.
AB - In this paper, four samples of meta-halloysite from widely available Cameroon halloysite clay calcined at 600, 650, 700 and 750 °C, respectively, and the resultant geopolymer binders were systematically characterized. Isothermal conduction calorimetry (ICC) was used to measure the reaction kinetics of meta-halloysite geopolymers at room temperature during 48 h. The increase in reaction rate and in heat released correlates with the thermal activation temperature. It was typically found that the increase of thermal activation temperature (from 600 to 750 °C) enhances the amorphous or reactive phase content from MH600 to MH750 samples. This results in an improvement of rheological behaviour and setting time of the fresh meta-halloysite based geopolymer pastes. The hardened meta-halloysite based geopolymers were amorphous, compact and dense according to X-ray diffractometry (XRD) and Scanning Electron Microscopy (SEM). The compressive strength of resultant products increased with the activation temperature, up to 750 °C (74 MPa at 180 days). Therefore, the best temperature in view of the highest strength of meta-halloysite geopolymer cured at room temperature is 750 °C, although the lower increase in mechanical performance (7.3%) gained between GPMH700 and GPMH750 is limited. Thus, thermally activated halloysite clay appears to be a promising candidate for geopolymer synthesis.
KW - Geopolymer
KW - Halloysite
KW - Kinetic reaction
KW - Mechanical properties
KW - Meta-halloysite
KW - Rheology
KW - Thermal activation
UR - http://www.scopus.com/inward/record.url?scp=85088394115&partnerID=8YFLogxK
U2 - 10.1016/j.clay.2020.105773
DO - 10.1016/j.clay.2020.105773
M3 - Article
AN - SCOPUS:85088394115
VL - 196
JO - Applied clay science
JF - Applied clay science
SN - 0169-1317
M1 - 105773
ER -