Abstract
High strength concrete (HSC) is the most widely used material and is presented in many different constructions such as rigid pavement. Concrete has a low tensile strength, limited fatigue life, and is characterized by brittle failure resulting in almost complete loss of loading capacity. HSC reinforced with fibers has displayed great performance in both fresh and hardened states. Recently, the use of single fiber has increased in the rigid pavement and the study of its effect on the properties of concrete. It was found that there is a need to study and compare the effect of adding hybrid fiber to concrete mixture to improve the behavior and properties of concrete. This study investigates the optimization of HSC reinforced with steel fiber by different percentages (0% to 1%), polypropylene fiber (0.0% to 0.26%) and the hybridization of steel fiber and polypropylene fiber as 1% volumetric fractions (0.8% + 0.2%), (0.7% + 0.3%) and (0.6% + 0.4%), respectively. The slump value, compressive strength, tensile strength, and flexural strength are determined. Abrasion resistance and water absorption are also measured. The fiber percentage is adjusted to alter the brittle failure. The results showed that adding fibers to the concrete mixture decrease both slump and abrasion, while increasing permeability, tensile and compressive strength.
Highlights
The foundation of infrastructure improvement in any country is the development of roads and highways
This study presents experimental tests carried out on concrete mixes using SF, polypropylene fiber (PPF), and Hybrid fiber reinforced concrete (HFRC) aims to investigate the effect of both fiber type and fiber content
Fresh and hardened properties of mixes are measured like the slump, and compressive strength, split tensile strength, flexural strength, abrasion resistance, and water absorption of hardened properties of concrete with different percentages of fibers
Summary
The foundation of infrastructure improvement in any country is the development of roads and highways. From the foregoing, the use of one type of fiber inside the concrete improves the properties of FRC at a limited level, so the use of Hybrid fiber reinforced concrete (HFRC) was directed. [24] studied the mechanical properties of concrete such as (compressive strength, split tensile and flexural strength) reinforced with hybrid fibers (SF1%+PPF0.035%). This studding proved that addition of hybrid fibers improve and increase the values of compressive, split tensile and flexural strength. This study proved that by using hybrid fibers improve flexural behavior, the increase of volume fractions of both SF and PPF increases the mechanical properties of concrete. To determine the optimum fiber content of single and HFRC on fresh and hardened reinforced concrete properties
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