Abstract
Concrete being a mixture of cement, aggregates (fine and coarse) and water, can be used in vast range of applications. It has excellent durability and availability which are its main advantages. Though, concrete is strong in compression it is comparatively weak in tensile loading. Over the years various materials have been used to reinforce concrete to withstand the tensile stresses. Polypropylene fibre is one such fibre which comes in varied sizes, is nowadays being utilized to reinforce concrete. In this study, three PP fibres were used at 0.20%, 0.25% and 0.30% content by weight. The flexural and compressive strengths were determined. Based on the results, it was observed with increase in size of fibre the compressive strength decreased significantly though it was still higher than the controlled sample. The length of PP fibres had significant effect on the compressive strength and flexural strength of concrete. Short PP fibres showed relatively higher compressive strength but lower flexural strength when higher fibre content is used, while long PP fibres achieved lower compressive strength but higher flexural strength than shorter PP fibres. The optimum dosage for both PP fibre sizes was 0.25% at which it achieved increased strength as compared to control sample.
Highlights
Through the last hundred years, Concrete has established itself as one of the major construction and building materials
Ever since the development of concrete in early 19th century, it was known that concrete is strong in compression but significantly weak under tensile stresses, due to this, many researchers focused their interest on reinforcements to enhance the mechanical properties of concrete specially its low tensile capacity
The compressive strength was conducted according to BS EN 12390-3:2009 [19]
Summary
Through the last hundred years, Concrete has established itself as one of the major construction and building materials. This has been mainly due to its excellent durability and availability and ease of moulding concrete into any desired shape. Though concrete has various advantages, it is known to strong under compression but relatively weak under tensile stresses. Over the years, researchers have used various materials to reinforce the concrete to withstand such tensile stresses. Civil engineering structures such as houses, bridges, storage tanks, dams, etc. Utilize Reinforced Concrete (RC) [2] Civil engineering structures such as houses, bridges, storage tanks, dams, etc. utilize Reinforced Concrete (RC) [2]
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