Effect of Bentonite as Partial Replacement of Cement on Residual Properties of Concrete Exposed to Elevated Temperatures

• Published in: Sustainability 2022-09, Vol.14 (18), p.11580
• Main Authors: Farhan Mushtaq, Sardar, Ali, Ather, Khushnood, Rao Arsalan, Tufail, Rana Faisal, Majdi, Ali, Nawaz, Adnan, Durdyev, Serdar, Burduhos Nergis, Dumitru Doru, Ahmad, Jawad
• Format: Article
• Language: English
• Subjects: Absorption; Analysis; Bentonite; Building materials; Cement; Compressive strength; Concrete; Concrete mixing; Concrete properties; Decomposition; Ductility; Ductility tests; Durability; Elastic properties; Emissions; Energy absorption; Fire resistant materials; Heat resistance; High resistance; High temperature; Mechanical properties; Mechanical tests; Modulus of elasticity; Service life; Sustainability; Tensile strength; Testing; Water absorption; Water resistance
• ISSN: 2071-1050; 2071-1050
• DOI: 10.3390/su141811580

This study investigated the effect of elevated temperature on the mechanical, physical and durability properties of normal strength concrete, modified with bentonite. The bentonite concrete was cast by substituting cement with bentonite content in proportions of 5, 10 and 15% by weight. Mechanical tests were conducted (compressive and splitting tensile strength). Furthermore, durability performance (mass loss and sorptivity) and specimen properties (elastic modulus, stress–strain behaviour, ductility and energy absorption) were evaluated and discussed. The results demonstrated that samples incorporating bentonite showed better fire endurance than the control mix. The inclusion of bentonite in concrete decreased the mass loss of the specimens exposed to high temperatures. The performance of bentonite concrete was better in terms of mechanical behaviour (compressive and tensile strength) than that of conventional concrete, and it had high resistance to water absorption. Higher ductility and energy absorption capacity were observed for the concrete specimen containing bentonite than its counterpart control specimens.