Keywords

Abstract

Hybrid basalt fibre;

 Mechanical properties; 

Fibre reinforced concrete; 

 Flexural strength;  

High strength concrete

Hybrid fibre-reinforced concrete combines different types of fibres or fibres of varying lengths to maximize their individual advantages, which can potentially lead to a synergistic enhancement in overall performance. The main aim of this study is to explore the feasibility of integrating a hybrid fibre system to enhance the efficiency and properties of basalt fibre-reinforced concrete. Specifically, the research focuses on evaluating the mechanical characteristics of basalt hybrid fibre-reinforced concrete across two concrete grades: normal strength M30 and high strength M60. Basalt fibres of 12 mm and 30 mm lengths are used to hybridize the concrete, with a total fibre volume fraction of 1.5%. By incorporating both short and long basalt fibres into the concrete matrix, this study aims to assess how these variations impact essential properties such as workability, compressive strength, flexural strength, and Modulus of Elasticity (MOE). The hybrid mix, comprising 25% of 12 mm fibres and 75% of 30 mm fibres at a volume content of 1.5%, demonstrates enhanced mechanical properties across all concrete grades. The addition of basalt fibres, particularly those with higher proportions of longer fibres, results in a decrease in workability. Notably, hybridizing fibres have no discernible effect on compressive strength or MOE in both concrete grades. From the results it was observed that the flexural strength of the optimal hybrid mixes is significantly higher, surpassing conventional concrete by 39% and 54.35% for M30 and M60 grades of concrete, respectively.

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