Determination of material design values for steel fibre reinforced self-stressing concrete (SFRSSC) structures
2020
Suta, M., PRIMEKSS, SIA, Riga (Latvia) | Lukasenoks, A., Riga Technical Univ. (Latvia) | Cepuritis, R., Norwegian Univ. of Science and Technology, Trondheim (Norway)
With steel fibre reinforced concrete (SFRC) technology advancing for multiple decades already there are more and more fields that see the material as an opportunity of making structures more efficient whether cost-wise, time-wise, material-wise. Multitude of design guidelines have been produced over the years and many testing setups have been invented and standardized for the sole purpose of getting to know the capabilities of the material. Yet, the material is still being developed further with such materials being introduced as steel fibre reinforced self-stressing concrete (SFRSSC) among others. The current design guidelines show how to arrive to a structure from material properties of SFRC and SFRSSC obtained from testing. Nevertheless, the testing methods for this material are very different to each other and, although, with one and the same purpose, they share very little in terms of what they are actually capable of showing and how relevant it actually is to the structure to be built. To provide an overview of how different methods of testing with their inherent pros and cons evaluate the same material a series of tests have been devised to capture the material capabilities of SFRC. Depending on the test method, it can be seen that the difference in the results can be as low as none and as high as 15 % in terms of load bearing capacity of the material. This difference translates to having a slab on piles with thickness of 210 mm, 240 mm, 235 mm, respectively, for tests according to SIA 162/6, ASTM 1550C, EN 14651 ceteris paribus, showing that from perspective of leanest design tests according to SIA162/6 are the best.
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