<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Due to the low density of lightweight concrete, work has been done in this research to develop it by adding fibers of more than one type to improve its properties. Basic tests were conducted to determine the properties of concrete before and after the addition of fibers. The variables of the models were beams in two groups (shear and flexural). The variables of these two groups included the type of fibers (steel and polypropylene) and the size of the added fibers 0 %, 0.05 %, 0.1 % for polypropylene fibers 0 %, 0.75 %, 1 % for steel fibers. This study presented an examination of 18 beam specimens and discussed the results, which included mechanical properties (air dry density, slump test, compressive strength, modulus of elasticity, flexural strength, and splitting tensile strength). The results showed that the addition of fibers had an effective effect on the compressive strength, and this led to an increase in the resistance to shear forces and flexural forces, as the highest load capacity was shown by adding polypropylene fibers at a rate of 0.1 % in both groups, and the fibers played an important role in reducing the width of cracks and controlling their spread due to modulus of elasticity of the fiber.</p>
</abstract>

Due to the low density of lightweight concrete, work has been done in this research to develop it by adding fibers of more than one type to improve its properties. Basic tests were conducted to determine the properties of concrete before and after the addition of fibers. The variables of the models were beams in two groups (shear and flexural). The variables of these two groups included the type of fibers (steel and polypropylene) and the size of the added fibers 0 %, 0.05 %, 0.1 % for polypropylene fibers 0 %, 0.75 %, 1 % for steel fibers. This study presented an examination of 18 beam specimens and discussed the results, which included mechanical properties (air dry density, slump test, compressive strength, modulus of elasticity, flexural strength, and splitting tensile strength). The results showed that the addition of fibers had an effective effect on the compressive strength, and this led to an increase in the resistance to shear forces and flexural forces, as the highest load capacity was shown by adding polypropylene fibers at a rate of 0.1 % in both groups, and the fibers played an important role in reducing the width of cracks and controlling their spread due to modulus of elasticity of the fiber.

Shear and Flexural Behavior of Lightweight Concrete Beams Containing Hybrid Fibers

Department of Civil Engineering, College of Engineering

Civil and Environmental Engineering

This work is licensed under the Creative Commons Attribution 4.0 International License.

Due to the low density of lightweight concrete, work has been done in this research to develop it by adding fibers of more than one type to improve its...

Shear and Flexural Behavior of Lightweight Concrete Beams Containing Hybrid Fibers

Published Online: May 12, 2023

Page range: 206 - 217

DOI: https://doi.org/10.2478/cee-2023-0018

Keywords
Reinforced concrete beams, Flexural behavior, Shear behavior, Lightweight aggregate, Hybrid fibers

© 2023 Noora H. A. Al-Khafaji et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Shear and Flexural Behavior of Lightweight Concrete Beams Containing Hybrid Fibers

Published Online: May 12, 2023

Page range: 206 - 217

DOI: https://doi.org/10.2478/cee-2023-0018

KeywordsReinforced concrete beams, Flexural behavior, Shear behavior, Lightweight aggregate, Hybrid fibers

© 2023 Noora H. A. Al-Khafaji et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
Reinforced concrete beams, Flexural behavior, Shear behavior, Lightweight aggregate, Hybrid fibers