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High performance concrete (HPC) is a material more frequently used in the building industry due to its durability. Fibres are added to the matrix as reinforcement to control cracking and to increase ductility [1]. Fibre concrete research has been conducted for over fifty years, and still the future directions for its development are being set [2, 3]. One of the recent concept is hybridization of fibres, the optimum combination of several kinds of them with different properties to create a complex composite with a very high resistance to cracking in a wide range of crack width [4]. The aim of this article is to establish the fracture properties of HPC containing two widely used types of fibers. The experimental investigation consisted of test on cubes, cylinders and notched prismatic specimens made from plain HPC and fiber HPC with variable content ranging from 0.25 to 1% of steel or/and polypropylene fibers. Extensive data on compressive, splitting and flexural tensile behavior, modulus of elasticity and fracture energy were recorded and analyzed. A typical experimental set up, loaddeflection and load-CMOD curves of the FRHPC specimen are shown in Fig1
The present results obtained from investigations have shown that hybrid fibers contribute immensely to the structural stability of HPC elements.
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