UNDERSTANDING THE REBOUND SURFACE HARDNESS OF CONCRETE
| Autor: | István Zsigovics, Katalin Szilágyi, Adorján Borosnyói |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Building construction
Materials science Strategy and Management surface hardness non-destructive testing Modulus Young's modulus rebound index compressive strength Hardness Indentation hardness law.invention symbols.namesake Compressive strength law Vickers hardness test symbols concrete Young’s modulus Hammer Composite material Material properties TH1-9745 Civil and Structural Engineering |
| Zdroj: | Journal of Civil Engineering and Management; Vol 21 No 2 (2015); 185-192 Journal of Civil Engineering and Management, Vol 21, Iss 2 (2015) |
| ISSN: | 1822-3605 1392-3730 |
| DOI: | 10.3846/13923730.2013.802722 |
| Popis: | Surface hardness testing of materials can be considered as the oldest method to get information about strength related material properties. In recent decades the rebound hammer has been the most popular surface hardness testing device for concrete uniting the advantages of its predecessors. In the technical literature numerous proposals are available for simple, two-parameter regression analyses of rebound surface hardness vs. compressive strength relationship of concrete. The remarkable diversity of the proposed curves implies the need of the more than two-parameter regression techniques to reveal the most pronounced parameters governing hardness behaviour. The objectives of present experimental studies were to carry out dynamic and static hardness tests, Young’s modulus and compressive strength tests on concrete specimens. From the development of the tested properties with time it can be concluded that the rebound hammers provide a hardness value for high strength concretes connected to the Young’s modulus rather than the compressive strength. Present paper includes a parametric simulation and a parameter fitting of the verified phenomenological constitutive model of the authors which recognizes the w/c ratio as the main driver of the interrelated material properties and gives a realistic formulation for the time dependent behaviour of the rebound surface hardness of concrete. |
| Databáze: | OpenAIRE |
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