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NATURAL FIBRES AS A SUSTAINABLE ALTERNATIVE FOR REDUCING CONCRETE MICROCRACKING
Abstract
The incorporation of natural fibres as reinforcement of concrete is attractive from a sustainable perspective. In fact, natural fibres improve the deformation capacity and increase the ductility of concrete. In addition, natural fibres are lightweight, renewable, less expensive than man-made fibres and locally abundant. However, in order to determine their use in different concrete applications, it is necessary to know the impact on the mechanical properties and the benefits that can be obtained by incorporating the fibres. In this regard, the objective of the present study is to determine the impact of incorporating 0.5%, 1.0% and 1.5% eucalyptus fibre on the workability, compressive strength of concrete and the ability to control the development of micro-cracks. The results indicate that as fibre percentages increases, the workability decreases. However, for all the cases evaluated, the reduction in workability was not significant. Additionally, in all cases, higher compressive strength was observed at 7 days of age compared to the control sample without fibre. This fact may represent constructive advantages from a construction time optimisation perspective. Finally, the samples with fibres decreased the length, width and number of cracks generated in the concrete. Therefore, eucalyptus fibres are suitable as an alternative to control micro-cracking, which can increase the service life of the structures and save maintenance costs.
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