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Open AccessArticle

The Influence of Thermo-Mechanical Activation of Bentonite on the Mechanical and Durability Performance of Concrete

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Department of Civil Engineering, University of Engineering and Technology, Taxila 47050, Pakistan
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Department of Civil Engineering, International Islamic University, Islamabad 44000, Pakistan
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Department of Civil Engineering, HITEC University, Taxila 47050, Pakistan
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Department of Civil Engineering, University of Engineering and Technology, Peshawar 25120, Pakistan
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Department of Civil Engineering, College of Engineering and Technology, University of Sargodha, Sargodha 40100, Pakistan
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Department of Civil Engineering, University of Engineering and Technology, Peshawar (Bannu Campus) 28100, Pakistan
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(24), 5549; https://doi.org/10.3390/app9245549
Received: 27 September 2019 / Revised: 16 November 2019 / Accepted: 19 November 2019 / Published: 17 December 2019
(This article belongs to the Special Issue Low Binder Concrete and Mortars)
Despite presenting a very high global warming toll, Portland cement concrete is the most widely used construction material in the world. The eco-efficiency, economy, and the overall mechanical and durability performances of concrete can be improved by incorporating supplementary cementitious materials (SCMs) as partial substitutions to ordinary Portland cement (OPC). Naturally found bentonite possesses pozzolanic properties and has very low carbon footprint compared to OPC. By applying activation techniques, the reactivity of bentonite can be improved, and its incorporation levels can be maximized. In this study, the influence of mechanical and thermo-mechanical activation of bentonite is investigated on properties of concrete. Bentonite was used for 0%, 10%, 15%, 20%, 25%, 30%, and 35% mass replacements of OPC. Mechanical (compressive strength and split tensile strength) and durability (water absorption, sorptivity coefficient, and acid attack resistance) properties were studied. Results of experimental testing revealed that, concrete containing bentonite showed good mechanical performance, while durability was significantly improved relative to control mix. Application of thermo-mechanical activation can enhance the incorporation levels of bentonite in concrete. At 15% and 25%, bentonite produced optimum results for mechanical and thermo-mechanical activation, respectively. Bentonite inclusion is more beneficial to the durability than the mechanical strength of concrete. View Full-Text
Keywords: bentonite; compressive strength; sorptivity; acid attack resistance; durability of concrete; eco-efficient binder; low-cost binder bentonite; compressive strength; sorptivity; acid attack resistance; durability of concrete; eco-efficient binder; low-cost binder
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Rehman, S.U.; Yaqub, M.; Noman, M.; Ali, B.; Ayaz Khan, M.N.; Fahad, M.; Muneeb Abid, M.; Gul, A. The Influence of Thermo-Mechanical Activation of Bentonite on the Mechanical and Durability Performance of Concrete. Appl. Sci. 2019, 9, 5549.

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