Impact Resistance of Hybrid Steel-Polypropylene Fiber Reinforced Concrete

Abstract

This paper present the results of an investigation conducted to the study the impact resistance, 28-days compressive strength, and modulus of rupture MOR, of hybrid steel- polypropylene fibre reinforced concrete. Experimental investigations were planned in which 144 plain concrete and hybrid fires reinforced concrete (HFRC) specimens, of size (100×100×500) mm were tested for impact resistance, and Module of Rupture (MOR), and a molds of (150 × 150 × 150) mm were tested for compressive strength. The specimen incorporated three different volume of fraction, 0.25%, 0.75%, and 1.25%, with five different hybridization ratio mix of (100 %- 0%), (65 % - 35%), (50 %-50 %), (35 % - 65%), and (0 % - 100 %), (steel to polypropylene) respectively. The drop weight type impact tests were conducted on plain concrete, and HFRC specimen, and the number of blows of the hammer required to induce first visible crack and ultimate failure of the specimen were recorded. The results showed that addition of polypropylene fiber to concrete mix reduce the compressive strength, on the other hand, the results showed generally, additions of fibers to concrete mix increase the MOR. The results were introduced in term of impact energy at first crack and ultimate failure. It have been observed that concrete containing (0 % - 100%) (Steel to polypropylene) fibres at 1.25% volume fraction gave the best performance of the tested spacemen under impact loading.
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