University of Oulu

Rodrigue Kaze, C., Ninla Lemougna, P., Alomayri, T., Assaedi, H., Adesina, A., Kumar Das, S., Lecomte-Nana, G.-L., Kamseu, E., Chinje Melo, U., & Leonelli, C. (2021). Characterization and performance evaluation of laterite based geopolymer binder cured at different temperatures. Construction and Building Materials, 270, 121443. https://doi.org/10.1016/j.conbuildmat.2020.121443

Characterization and performance evaluation of laterite based geopolymer binder cured at different temperatures

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Author: Rodrigue Kaze, Cyriaque1,2; Ninla Lemougna, Patrick3,4; Alomayri, Thamer5;
Organizations: 1Laboratory of Applied Inorganic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
2Laboratory of Materials, Local Materials Promotion Authority, MINRESI/MIPROMALO, Yaoundé, Cameroon
3School of Chemical Engineering and Mineral Industries, University of Ngaounderé, Cameroon
4Fibre and Particle Engineering Research Unit, University of Oulu, Finland
5Department of Physics, Umm-Al-Qura University, Makkah, Saudi Arabia
6Department of Physics, University College in AlJumum, Umm Al-Qura University, Makkah, Saudi Arabia
7Department of Civil and Environmental Engineering, University of Windsor, Windsor, Canada
8CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha, India
9Institut de Recherche sur les Céramiques (IRCER, UMRCNRS 7315), ENSIL-ENSCI, Université de Limoges, CEC, 12 Rue Atlantis, 87068 Limoges Cedex, France
10Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, ViaP. Vicarelli 10, 41125 Modena, Italy
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2022021018527
Language: English
Published: Elsevier, 2021
Publish Date: 2022-11-06
Description:

Abstract

This paper presents the results of experimental evaluation of curing conditions on the microstructure and performance of geopolymer binders developed from iron-rich laterite soils. Two calcined iron-rich laterites namely LB600 and LY600 were used as solid precursors in the preparation of geopolymer binders. The geopolymer samples were cured at 20, 60 and 80 °C. FTIR, XRD, EDS and DTA/TG were used to evaluate the microstructural properties of the prepared products. The performance of the binder was evaluated in terms of the compressive strengths, water absorption, porosity, bulk density and thermal conductivity. The findings from this study showed that the dissolution of the calcined laterites in 8 M NaOH increased the dissolution of Al, Si and Fe elements with increasing temperature from 20 to 80 °C. This higher dissolution of the monomers further resulted to an increase in the compressive strength of the binders at 7 and 28 days. It was also found out that curing the geopolymer in the dry state resulted in higher compressive strength at all ages compared to those cured in the wet and wet-dry state. Drying shrinkage evaluation of the geopolymer samples cured between 60 and 80 °C exhibited a lower linear shrinkage due to a high degree of geopolymerization. Microstructural investigation of the geopolymer samples cured at 80 °C showed a heterogeneous compact and dense structure resulting from high polycondensation. This densified microstructure also induced an increase in the thermal conductivity from 0.65 to 0.90 W/mK and 0.75 to 0.91 W/mK for LB600 and LY600, respectively. Nonetheless, both geopolymer binders made of LB600 and LY600 laterite powders performed well in dry, wet and wet-dry conditions, and can be used for various construction applications especially in the precast industry.

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Series: Construction & building materials
ISSN: 0950-0618
ISSN-E: 1879-0526
ISSN-L: 0950-0618
Volume: 270
Article number: 121443
DOI: 10.1016/j.conbuildmat.2020.121443
OADOI: https://oadoi.org/10.1016/j.conbuildmat.2020.121443
Type of Publication: A1 Journal article – refereed
Field of Science: 222 Other engineering and technologies
Subjects:
Funding: This project received the contribution of the FLAIR fellowship African Academic of Science and the Royal Society through the funding N° FLR/R1/201402. The authors also are grateful to Ingessil S.r.l., Verona, Italy, for providing sodium silicate used. RCK grateful acknowledges the financial support of AVRUL (Agence pour la Valorisation de la Recherche Universitaire du Limousin) for his stay in IRCER, UMRCNRS 7315, Limoges under 2018 AVRUL postgraduate internship. PNL is acknowledging the support from the Fibre and Particle Engineering Research Unit, University of Oulu, Finland.
Copyright information: © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http:/creativecommons.org/licenses/by-nc-nd/4.0/
  https://creativecommons.org/licenses/by-nc-nd/4.0/