Mechanical Properties of High-Performance Hybrid Fibre-Reinforced Concrete at Elevated Temperatures

Moawiah Mubarak, Raizal Saifulnaaz Muhammad Rashid, Mugahed Amran, Roman Fediuk, Nikolai Vatin and Sergey Klyuev
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Moawiah Mubarak: Department of Civil Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Malaysia
Raizal Saifulnaaz Muhammad Rashid: Department of Civil Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Malaysia
Mugahed Amran: Department of Civil Engineering, College of Engineering, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
Roman Fediuk: Polytechnic Institute, Far Eastern Federal University, 690922 Vladivostok, Russia
Nikolai Vatin: Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia
Sergey Klyuev: Department of Theoretical Mechanics and Strength of Materials, Belgorod State Technological University Named after V.G. Shukhov, 308012 Belgorod, Russia

Sustainability, 2021, vol. 13, issue 23, 1-17

Abstract: Deterioration of concrete’s integrity under elevated temperature requires an alteration in its composition to have better thermal stability. Fibre-reinforced concrete has shown significant improvements in concrete strength and this paper aimed to investigate the influence of steel (ST) and polypropylene (PP) fibres on the behaviour of high-performance concrete (HPC) exposed to elevated temperatures. Six mixtures were prepared and cast by adding one or two types of polypropylene fibre (54 and 9 mm) at 0.25 or 0.5% and either singly or in a hybrid combination, along with a fixed volumetric content at 1% of five-dimensional hooked steel (5DH) fibres. At the age of 28 days, samples were heated to the targeted temperature of 800 °C and cooled down naturally to the laboratory temperature. Visual inspection, flexural, split tensile and compressive strengths were examined before and after the exposure to elevated temperatures. Results exhibited that the hybridization of long and short PP fibres, along with the ST fibres, has notably improved all residual mechanical properties of HPC and kept the integrity of concrete after exposure to elevated temperatures. In addition, PP fibres can significantly prevent spalling, but ST fibres were ineffective in mitigating explosive spalling in beams specimens.

Keywords: elevated temperatures; high-performance concrete; hybrid fibre; thermal resistance; steel and polypropylene fibres; mechanical properties (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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