Abstract
Abstract In this study, mass concrete samples with tire rubber chips (rubberized concrete) were evaluated in order to determine if the addition of rubber particles would enhance cracking strength due to volumetric variations of thermal origin, compared to a reference concrete, without rubber. Samples of the concretes studied were initially tested to characterize their thermal and mechanical properties. The test results were used as parameters for the analysis of the thermo-mechanic behavior of the rubberized concrete by means of a software that determined the thermal and stress response on a bi-dimensional dominion of a structural element of hypothetical geometry, typical of dam construction, applying FEM (finite element method) analysis. The results obtained indicated that, although the maximum temperatures expected are similar for both concretes (reference and rubberized), those containing tire rubber chips are subjected to lower tensile stresses, about half the stress generated in the control concrete. This behavior indicates that the addition of tire rubber chips in concrete is an efficient strategy to minimize the risk of cracking due to thermal stresses.
Highlights
The use of tire particles mixed in concrete, forming a composite known as rubberized concrete, has received increasing attention from several research groups[1,2,3,4,5,6,7]
The results obtained indicated that, the maximum temperatures expected are similar for both concretes, those containing tire rubber chips are subjected to lower tensile stresses, about half the stress generated in the control concrete
The design of mass concrete structures is generally based on durability, economy, and thermal action, with strength often being a secondary concern.”[5]. This study is part of a larger research focused on the viability of incorporating tire particles in concrete, developed at the Technological Center of Civil Engineering at FURNAS Centrais Elétricas S/A, with the support of the National Electrical Energy Agency – ANEEL, and the National Council for Scientific and Technological Development – CNPq/Brazil
Summary
The use of tire particles mixed in concrete, forming a composite known as rubberized concrete, has received increasing attention from several research groups[1,2,3,4,5,6,7]. Despite the fact that concretes with tire rubber tend to present lower compressive and tensile strengths, they have a greater deformation capacity and less fragile behavior in fracture, indicating a higher capacity of energy absorption compared to conventional concretes. This behavior is attributed to the capacity of rubber, as an aggregate, of enduring greater elastic strains before the final fracture of the composite[1,2,3,4]. This study is part of a larger research focused on the viability of incorporating tire particles in concrete, developed at the Technological Center of Civil Engineering at FURNAS Centrais Elétricas S/A, with the support of the National Electrical Energy Agency – ANEEL, and the National Council for Scientific and Technological Development – CNPq/Brazil
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