The Effect of Scrap Tires Recycled Steel Fibers on Some Hardened Properties of Green SCC

Salam, Nadeem; Khalil, Wasan I.

doi:10.30684/etj.2022.132605.1133

	The Effect of Scrap Tires Recycled Steel Fibers on Some Hardened Properties of Green SCC
Engineering and Technology Journal
Article 17, Volume 40, Issue 5, May 2022, Pages 810-818 PDF (870.02 K)
Document Type: Research Paper
DOI: 10.30684/etj.2022.132605.1133
Authors
Nadeem Salam^* ¹; Wasan I. Khalil²
¹civil engineering, University of Technology, Baghdad, Iraq
²Department of Civil Engineering, University of Technology
Abstract
The purpose of this study is to investigate some hardened properties of green self-compacting concrete (GSCC) with 15% volumetric replacements of crushed clay brick waste as coarse aggregate and reinforced with scrap tires recycled steel fibers (STRSF) with 0, 0.25, 0.5and 0.75%volume fraction and 40 as an aspect ratio. Also, a combination of two STRSF aspect ratios of 40 and 60 was used in GSCC as hybrid fiber reinforcement (0.25 and 0.25%, 0.5 and 0.25%, 0.25 and 0.5% of aspect ratios 40 and 65, respectively). Scrap tires recycled steel fibers had been used to improve the properties of the green self-compacting concrete containing crushed clay brick waste aggregate. Dry density, water absorption, compressive strength, splitting tensile strength, flexural strength, and Ultrasonic Pulse Velocity (UPV) were among the properties of SCC that had been investigated. To achieve the purpose of this study, seven concrete mixes were prepared.SCC density, compressive strength, splitting tensile strength, flexural strength, and UPV are all increased with the increase of recycled steel fibers content in self-compacted concrete. Including different volume fractions and aspect ratios of scrap tire recycled steel fibers increased the compressive strength between 2.54% to 23%. The splitting tensile strength was about 5.6% to 13.9%, and the flexural strength increased from 1.6% to 14.8%. All GSCC mixes reinforced with STRSF show good performance according to the classification limits of SCC with high compressive strength, so these mixes are applicable for different weather conditions and construction projects.
Highlights
Using recycled fibers as a substitute for commercial fibers was investigated. The effect of fibers volume fraction and aspect ratio on the mechanical properties of SCC were studied. The possibility of producing sustainable high Strength GSCC using recycled coarse aggregate and recycled fibers was investigated.
Keywords
Green self-compacting concrete; Clay brick wastes; Scrap tires; Recycled steel fibers; Waste fibers

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