<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The construction industry consumes a large quantity of cement, which therefore leads to a high CO<sub>2</sub> 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.</p>
</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.

Calcinated Bentonite as Supplementary Cementitious Materials in Cement-Based Mortar

University Sciences and Technology Houari Boumediene USTHB

Laboratory of Physical Engineering Hydrocarbons

Faculty of Hydrocarbons and Chemistry (FHC)

University M’Hamed Bougara Boumerdès, Avenue of Independence

Department of Civil & Building Engineering

Journal of Applied Engineering Sciences

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

The construction industry consumes a large quantity of cement, which therefore leads to a high CO2 emission due to the cement manufacture. The partial...

Calcinated Bentonite as Supplementary Cementitious Materials in Cement-Based Mortar

Publicado en línea: 26 may 2021

Páginas: 23 - 32

Recibido: 05 ene 2021

Aceptado: 27 ene 2021

DOI: https://doi.org/10.2478/jaes-2021-0004

Palabras clave
Bentonite, Calcinated Bentonite, Termogravimetric analysis, Differential scanning calorimetry, Strength activity index

© 2021 N. Mesboua et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Calcinated Bentonite as Supplementary Cementitious Materials in Cement-Based Mortar

Publicado en línea: 26 may 2021

Páginas: 23 - 32

Recibido: 05 ene 2021

Aceptado: 27 ene 2021

DOI: https://doi.org/10.2478/jaes-2021-0004

Palabras claveBentonite, Calcinated Bentonite, Termogravimetric analysis, Differential scanning calorimetry, Strength activity index

© 2021 N. Mesboua et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Palabras clave
Bentonite, Calcinated Bentonite, Termogravimetric analysis, Differential scanning calorimetry, Strength activity index