Experimental Testing of Layered UHPFRC Beams

Abstract:

Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) is fine-grained cement-based material characterized by high compressive strength (exceeding 150 MPa) and high modulus of rupture (over 15 MPa). The results of strengths depend on the size of the tested element, the loading rate and the boundary conditions during a testing. This type of material is used in a lot of countries (e.g. Germany, France, the USA, Japan, Austria, and the Netherlands) but it is not commonly used in the Czech Republic. The bridge over R10 road from Prague to Mlada Boleslav near Benatky nad Jizerou was the first structure where UHPFRC materials were used for lost shuttering slabs. Due to inhomogeneity of the steel fiber distribution the maximum attained force ranged between 9.6 kN and 25.7 kN for different lost shuttering slabs. The amount of steel fibers was very low at a tension zone at slabs with the lower load-bearing capacity. Steel fibers in these slabs were at the bottom of the formwork. The inhomogeneity of the steel fiber distribution was the foundation for producing of functionally layered beams with controlled inhomogeneity due to the mixtures with different fibers volumes. The results and behaviors of the layered beams and the homogeneous beams are presented in this paper.

• Periodical: Advanced Materials Research (Volume 1000)
• Pages: 346-351
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1000.346
• Online since: August 2014
• Authors: Milan Rydval*, Jiří Kolisko, Petr Huňka, Tomáš Mandlík
• Keywords: Graded Specimens, Homogeneity, Steel Fiber (SF), UHPFRC

References

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