Abstract

This paper investigates the mechanical properties of two different types of recycled concrete, which use wood and rubber, relative to those characteristics of pure concrete, in terms of maximum load and natural frequencies. This paper contributes to the state of the art in this area in a number of ways. Firstly, the paper provides furtherance to the progressively growing literature in the field of recycled concrete and mechanical properties of materials. Secondly, the paper investigates the mechanical properties of two different types of recycled concrete by means of investigating the natural frequency of the samples, which is a new contribution. Lastly, the results from predicting the natural frequencies of concrete using fuzzy logic have been effectively assessed and compared with the analytical results. Results from the study show that the pure concrete samples produced maximum natural frequency, then concrete samples with wood, and lastly, concrete samples with rubber. The tolerance between the lab test results and fuzzy logic is approximately 5%. These results could have significant implications for furthering recycled concrete research and for designing machine foundations. Evidence of the applicability of fuzzy logic as a predictive and analysis tool for the mechanical properties of recycled concrete are discussed.

Highlights

  • Concrete has been one of the most widely used materials in the construction industry since it was invented by ancient Romans [1]

  • We investigate the mechanical properties of two different types of recycled concrete relative to those characteristics of pure concrete, in terms of maximum load and natural frequencies of the two products

  • There were three categories of samples: pure concrete (100% concrete mix), concrete with 15% wood mixture, and concrete with 15% rubber mixture

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Summary

Introduction

Concrete has been one of the most widely used materials in the construction industry since it was invented by ancient Romans [1]. The need for a more sustainable construction industry is of general concern and the industry is being urged to work towards this objective. The improvements in this area are being supported by research into new systems of managing waste in a more sustainable way [10]. These facts indicate that numerous research studies have been required over the last few years and are currently being implemented to find out new ways of producing more efficient and modern construction materials [10,11,12]. Applications of concrete, wood and rubber materials in machine foundations have extensively been discussed in the literature recently

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