Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6716271 | Construction and Building Materials | 2018 | 15 Pages |
Abstract
This paper analyzes the effect of temperature on steel fibers pull-out mechanism from a high strength concrete matrix and its contribution to the residual mechanical behavior of Steel Fiber Reinforced High Strength Concrete (SFRHSC). Pull-out tests of straight and hooked end fibers and uniaxial tension tests on the fiber filaments exposed to room and high temperature (300â¯Â°C, 375â¯Â°C and 475â¯Â°C) were performed. Additionally, two SFRHSC incorporating 30â¯kg/m3 and 60â¯kg/m3 of hooked end steel fibers and a plain High Strength Concrete (HSC) exposed to the same temperatures were studied. Uniaxial compression tests and bending tests on notched prisms were used to characterize the composite material. The experimental results were analyzed with the aid of a pull-out model and a meso-model for SFRHSC, both developed by the authors. It is shown that hooked end fibers pull-out strength was reduced after the exposure to high temperatures. Since concrete strength only contributes in a small region surrounding the hooks, the pull-out strength reduction can be mainly attributed to the reduction of steel strength and frictional effects due to high temperature exposition. HSC tension strength reduction begins earlier and it is proportionally greater than pull-out strength reduction. As a consequence, HSC bending strength decreases faster than SFRHSC strength.
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Physical Sciences and Engineering
Engineering
Civil and Structural Engineering
Authors
Gonzalo Ruano, Facundo Isla, Bibiana Luccioni, Raúl Zerbino, Graciela Giaccio,