Formulation of fibre reinforced concrete

Abstract

GENERAL CONCLUSION :It is very unfortunate that due to the infamous pandemic, Covid-19, we did not have access to the laboratory hence did not manage to carry out the experimental part of our project. As far as practical work is concerned, we did characterisation of materials. Our work is based more on the research and experiments done by other different authors. In this study, we were interested in the reinforcement of concrete with fibres. Our attention was focused on the formulation of fibre reinforced concrete, durability parameters, and the mechanical behaviour of the concrete. At the end of this research and on the basis of the analysis of the results obtained, we drew the following conclusions: The study of the workability of fresh concrete reinforced with steel fibres, carried out beforehand, showed that it decreases when these fibres are incorporated into the concrete. Then the addition of superplasticizer is recommended to increase the workability of the concrete, but a high proportion of fibre leads to a rapid decrease in the latter because the incorporation of these fibres results in an increase in the surface area. Reinforcement of concrete with fibres can offer technical solutions for improving mechanical performance. These fibres guarantee improved behaviour thanks to better crack control which results in good ductility of the concrete. Compressive strength increases with increase in fibre dosage until optimum compressive strength was achieved after which it will decline. The influence and effectiveness of steel fibres in concrete are distinctively noticed at higher dosages of fibres. With high dosage of fibres significant improvement of ultimate flexural strength was attained. The post cracking tendency of the steel fibre reinforced concrete is affected by the fibre length as longer fibres show better post-cracking capability with strain hardening behaviour. A better distribution of steel fibres within the concrete as a result of adequate dosage of fibres provides an effective multi-directional reinforcement within the concrete matrix.