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Fatigue study of concrete with rubber

Grant number: 11/20060-2
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): December 01, 2011
Effective date (End): November 30, 2012
Field of knowledge:Engineering - Civil Engineering - Transportation Infrastructure
Principal Investigator:Maria da Consolação Fonseca de Albuquerque
Grantee:Lenon de Pauli
Home Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil

Abstract

The increase of tires produced is aggravating the problem of disposal. In Brazil, the National Environment Council (CONAMA) requires that, for every four new tires manufactured or imported the manufacturers and importers should give final destination. The tires have been used for several applications, and too have been inserted into the concrete. It has been observed that the increase of rubber content added to the concrete, reduces the resistance, but increases the strain in rupture, which means that this material exhibits behavior more ductile than concrete, being able to absorb more energy. This is very important in pavement, because a material more ductile has more difficulty to propagate catastrophically a crack, so it should have less chance of fatigue and therefore increase the life of the pavement. The aim of this work is to study the influence of recycled tire rubber addition on the mechanical behavior of concrete, for use on pavements, evaluating the tensile strength in bending and fatigue for conventional concrete, replacement 10% of sand volume by rubber and with the same mix of aggregates, but with the consumption of cement in the concrete for the same resistance of conventional concrete. This is intended to confirm that the more ductile material, for pavement, has a longer life.