Experimental Study of Rubberized Concrete Stress-Strain Behavior for Improving Constitutive Models
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Faculty of Civil Engineering and Architecture Osijek, Department for Technical Mechanics, Vladimira Preloga 3, Osijek HR-31000, Croatia
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Faculty of Civil Engineering and Architecture Osijek, Department for Materials and Structures, Vladimira Preloga 3, Osijek HR-31000, Croatia
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RISCO—School of Technology and Management, Polytechnic Institute of Leiria, Rua General Norton de Matos, Apartado 4133, 2411-901 Leiria, Portugal
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Author to whom correspondence should be addressed.
Materials 2018, 11(11), 2245; https://doi.org/10.3390/ma11112245
Received: 9 October 2018 / Revised: 7 November 2018 / Accepted: 7 November 2018 / Published: 11 November 2018
(This article belongs to the Special Issue Mechanical Characterization of Bio-Based Materials and Structures)
Inclusion of rubber into concrete changes its behavior and the established shape of its stress-strain curve. Existing constitutive stress-strain models for concrete are not valid in case of rubberized concrete, and currently available modified models require additional validation on a larger database of experimental results, with a wider set of influential parameters. By executing uniaxial compressive tests on concrete with rubber substituting 10%, 20%, 30%, and 40% of aggregate, it was possible to study and evaluate the influence of rubber content on its mechanical behavior. The stress-strain curve was investigated in its entirety, including compressive strength, elastic modulus, strains at significant levels of stress, and failure patterns. Experimental results indicated that increase of rubber content linearly decreases compressive strength and elastic modulus, but increases ductility. By comparing experimental stress-strain curves with those plotted using available constitutive stress-strain models it was concluded that they are inadequate for rubberized concrete with high rubber content. Based on determined deviations an improvement of an existing model was proposed, which provides better agreement with experimental curves. Obtained research results enabled important insights into correlations between rubber content and changes of the stress-strain curve required when utilizing nonlinear material properties.
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MDPI and ACS Style
Strukar, K.; Kalman Šipoš, T.; Dokšanović, T.; Rodrigues, H. Experimental Study of Rubberized Concrete Stress-Strain Behavior for Improving Constitutive Models. Materials 2018, 11, 2245.
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