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Calcinated Bentonite as Supplementary Cementitious Materials in Cement-Based Mortar

Authors
  • Mesboua, N.1, 2
  • Benyounes, K.3
  • Kennouche, S.1, 4
  • Ammar, Y.5
  • Benmounah, A.1
  • Kemer, H.1
  • 1 University M’Hamed Bougara, Boumerdes, Avenue of Independence, Boumerdes, 35000, [email protected], [email protected] , (Algeria)
  • 2 University Sciences and Technology Houari Boumediene USTHB, El-Alia, Bab Ezzouar , (Algeria)
  • 3 University M’Hamed Bougara Boumerdès, Avenue of Independence, Boumerdes, 35000 , (Algeria)
  • 4 Bouira University, 10000 , (Algeria)
  • 5 University of Sherbrooke, Sherbrooke, Quebec , (Canada)
Type
Published Article
Journal
Journal of Applied Engineering Sciences
Publisher
Sciendo
Publication Date
May 01, 2021
Volume
11
Issue
1
Pages
23–32
Identifiers
DOI: 10.2478/jaes-2021-0004
Source
De Gruyter
Keywords
License
Green

Abstract

The construction industry consumes a large quantity of cement, which therefore leads to a high CO2 emission due to the cement manufacture. The partial replacement of cement by supplementary cementations materials (SCMs) is considered as the most promising alternative to reduce the environmental impact of this industry. This investigation aims to evaluate the performance of calcinated clay (calcined bentonite at 850 °C) used as partial replacement of cement in cement-based mortar. The evaluated performances include the physico-chemical and mechanical properties, as well as microstructural characteristics.. Various characterization tests, including laser granulometry, X-ray diffraction (XRD), and X-ray fluorescence spectrometry (XRF) have been investigated. In addition, the hardened properties of different mortar mixtures were also investigated. Mortar mixtures incorporating different calcinated clay percentages corresponding to 8, 10, 12, and 14%, by mass of total binder content, were proportioned. Termogravimetric analysis (TGA) and its derivative (DTG), Differential scanning calorimetry (DSC), and microstructural (Scanning electron microscopy (SEM)) analysis were carried out on samples of mortar mixtures. Furthermore, the 28-d hardened properties were assessed to assess the pozzolanic activity of the investigated mixtures. Strength activity index (SAI), DSC, and TGA analyzes are presented. The obtained results showed that all the mixtures exhibited adequate pozzolanic activity conforming to the ASTM C618 specifications.

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