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

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 materia...

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Bibliographic Details
Published in:Applied sciences 2019-12, Vol.9 (24), p.5549
Main Authors: Rehman, Safi Ur, Yaqub, Muhammad, Noman, Muhammad, Ali, Babar, Ayaz Khan, Muhammad Nasir, Fahad, Muhammad, Muneeb Abid, Malik, Gul, Akhtar
Format: Article
Language:English
Subjects:
Acid resistance
Aggregates
Bentonite
Cement
Clay
Climate change
Compressive strength
Concrete
Concrete construction
Construction materials
Durability
Global warming
Hydration
Mechanical properties
Particle size
Permeability
Physical properties
Portland cement
Portland cements
Tensile strength
Water absorption
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app9245549