Abstract
The demands for high‐strength concrete (HSC) have been increasing rapidly in the construction industry due to the requirements of thin and durable structural elements. HSC is highly brittle. Therefore, to augment its ductility behavior, expensive fibers are used. These negative drawbacks of HSC can be controlled by incorporating waste materials into its manufacturing instead of conventional ones. Therefore, this study assessed the performance of HSC produced with different quantities of waste tire steel fiber (WSF) and fly ash (FA). WSF was used at two doses, namely, 0.5% and 1%, by volume in HSC, with low‐to‐medium volumes of FA, that is, 10%–35%. The studied durability parameters included rapid chloride permeability (RCP) and chloride penetration depth (CPD) by immersion method (28 and 120 days) and acid attack resistance (AAR) (28 and 120 days). Various basic mechanical properties of HSC were also analyzed, such as compressive strength (fCM), modulus of elasticity (ECM), splitting‐tensile strength (fCTM), and modulus of rupture (fCRM). The results revealed that the damaging effect of WSF on the RCP resistance of HSC is probably due to the high conductivity of steel fibers. However, test results of CPD showed that WSF produced insignificant changes in chloride permeability of HSC. Furthermore, when made with FA, WSF‐reinforced HSC yielded very low chloride permeability. Both WSF and FA contributed to the improvement in the AAR of HSC. WSF was highly useful to tensile properties while it showed minor effects on compressive properties (fCM and ECM). Optimum ductility and durability can be achieved with HSC incorporating 1% WSF and 10%–15% FA.
Highlights
Babar Ali,1 Erol Yilmaz,2 Ahmad Raza Tahir,1 Fehmi Gamaoun,3,4 Mohamed Hechmi El Ouni,5,6 and Syed Muhammad Murtaza Rizvi1
high-strength concrete (HSC) is highly brittle. erefore, to augment its ductility behavior, expensive fibers are used. ese negative drawbacks of HSC can be controlled by incorporating waste materials into its manufacturing instead of conventional ones. erefore, this study assessed the performance of HSC produced with different quantities of waste tire steel fiber (WSF) and fly ash (FA)
Both FA and WSF addition showed mixed effects of fCM depending on their percentage in an HSC mix. e 28 days fCM of HSC was increased by 6% at 10% FA addition. is improvement in fCM was credited to the effective filling effect and development of pozzolanic products [12, 15]
Summary
Babar Ali ,1 Erol Yilmaz ,2 Ahmad Raza Tahir, Fehmi Gamaoun, Mohamed Hechmi El Ouni, and Syed Muhammad Murtaza Rizvi. Erefore, this study assessed the performance of HSC produced with different quantities of waste tire steel fiber (WSF) and fly ash (FA). E substitution of a small and medium volume of cement with these waste powders can drastically reduce the CO2 footprint of concrete. The efficacy of potential cement substitution materials should be assessed properly in terms of their contribution towards durability and mechanical performance. FA is rich in alumina-silica, and it has minor amounts of calcium and iron oxides It qualifies as a potential cement replacement material [8]. E effects of FA on the properties of concrete have been studied properly It helps in the slow consumption of residual portlandite Ca(OH) and positively affects the resistance of concrete against water absorption, chloride attack, and drying shrinkage [9,10,11]. FA with high fineness and low carbon content is considered suitable for concrete applications
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