Effectiveness of hybrid discarded tire/Industrial steel fibers for improving the sustainability of concrete structures. (16th May 2023)

• Record Type: Journal Article
• Authors: Zia, Asad; Zhang, Pu; Holly, Ivan
• Is Part Of: Construction & building materials. Volume 378(2023)
• Publication Date: 2023-05-16
• Subjects: Concrete -- Discarded tire steel fibers -- Industrial steel fiber -- Hybrid fibers -- Eco-friendly concrete -- Sustainable structures -- Industrial waste recycling; A Aggregate -- ACI American concrete institute -- ASTM American Society for Testing and Materials -- CS Compressive strength (MPa) -- CCE Compressive cracked absorbed energy (MPa) -- CPE Compressive pre-crack absorbed energy (MPa) -- CTE Compressive total energy (MPa) -- CTI Compressive toughness index (-) -- D.I. Deflection index (-) -- EM Elastic modulus (GPa) -- ETRMA European Tire and Rubber Manufacturers Association -- EU European Union -- FRS Flexure residual strength (MPa) -- FS Flexure strength (MPa) -- FCE Flexural energy absorbed after cracking (kN.mm) -- FPE Flexural energy absorbed before cracking (kN.mm) -- FTI Flexural toughness index (-) -- FTE Flexural total energy (kN.mm) -- ISF Industrial steel fibers -- kg/m3 kilogram per cubic meter -- kN kilo-Newton -- LS Linear shrinkage (%) -- mm millimetre -- MoR modulus of rupture (MPa) -- MPa Mega Pascal -- 0FM Zero fiber concrete -- DSF Discarded tire steel fibers -- DSFRC Concrete reinforced with discarded tire steel fibers -- 1.2DSFRC Concrete reinforced with 1.25% of discarded tire steel fibers -- 0.5SFRC concrete reinforced with 0.50% of industrial steel fibers by volume proportion -- 0.5HFRC concrete containing 0.50% of hybrid fibers by volume proportion -- 0.6HFRC concrete containing 0.60% of hybrid fibers by volume proportion -- 0.7HFRC concrete containing 0.70% of hybrid fibers by volume proportion -- s second -- SCE split tensile cracked absorbed energy (kN.s) -- SPE Split tensile pre-crack absorbed energy (kN.s) -- SS Split tensile strength (MPa) -- STE Split tensile total energy (kN.s) -- STI Split tensile toughness index (-) -- WA Water absorption (%) -- % Percentage -- εo Compressive strain at the highest compressive stress (-); Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2023.131226
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Experimental properties of concrete reinforced with hybrid steel fibers are investigated. The linear shrinkage, strength properties, ductility, and energy absorption are evaluated. The considered properties are significantly improved. The effectiveness of hybrid fibers for sustainable rigid pavements is studied. Hybrid fibers are more beneficial than using industrial or raw steel fibers separately. Abstract: Using waste and raw materials in construction materials is vital for sustainable construction. In this respect, the use of discarded tire steel fibers (DSFs) is encouraged in the construction industry to decrease pollution. On the other hand, the production of commonly used industrial steel fibers (ISFs) involves emissions of CO2 . Many studies have been conducted to evaluate the influence of discarded tire steel fibers (DSFs) on concrete. It is found that using DSFs in raw form could not improve the desired properties as ISFs do. Therefore, it is expected that using both ISFs and DSFs together can help achieve the desired improvements in concrete properties for various civil engineering applications. The main objective of the current investigation is the effective use of DSFs for developing eco-friendly, sustainable concrete. This study aims to evaluate the experimental properties of fiber-reinforced concrete, incorporating hybrid fibers (DSFs and ISFs together). Concrete specimens containing 0%, 0.50%, 0.60%, and 0.70% hybrid fibers by volume fraction are prepared. The hybrid fibers (HFs) comprise 30% of industrial steel fibers (ISFs) and 70% of discarded tire steel fibers (DSF) for each proportion. The 28th-day properties are examined. The slump and densities are determined. The experimental testing includes elastic modulus, compression (CS), split-tensile (SS), and bending testing (FS). The strength properties, deflection index, residual flexure strength, energy absorption, toughness index, and cracking behavior are reported. Moreover, the water absorption and linear shrinkage are also calculated. Except for the elastic modulus test, ASTM standards are used for casting and testing. A reduction of 45% in the LS and enhancements of 9.1%, 38%, 37%, and 23% are noticed in the EM, CS, SS, and FS of HFRC in contrast to zero-fiber concrete. Significant improvements are noticed in the properties of hybrid fiber-reinforced concrete compared to zero-fiber concrete.