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Advances in Concrete Construction
  Volume 13, Number 6, June 2022 , pages 433-450

Effect of rubber fiber size fraction on static and impact behavior of self-compacting concrete
Akshay A. Thakare, Salman Siddique, Amardeep Singh, Trilok Gupta and Sandeep Chaudhary

    The conventional disposal methods of waste tires are harmful to the environment. Moreover, the recycling/reuse of waste tires in domestic and industrial applications is limited due to parent product's quality control and environmental concerns. Additionally, the recycling industry often prefers powdered rubber particles (<0.60 mm). However, the processing of waste tires yields both powdered and coarser (>0.60 mm) size fractions. Reprocessing of coarser rubber requires higher energy increasing the product cost. Therefore, the waste tire rubber (WTR) less favored by the recycling industry is encouraged for use in construction products as one of the environment-friendly disposal methods. In this study, WTR fiber >0.60 mm size fraction is collected from the industry and sorted into 0.60-1.18, 1.18-2.36-, and 2.36-4.75-mm sizes. The effects of different fiber size fractions are studied by incorporating it as fine aggregates at 10%, 20%, and 30% in the self-compacting rubberized concrete (SCRC). The experimental investigations are carried out by performing fresh and hardened state tests. As the fresh state tests, the slump-flow, T500, V-funnel, and L-box are performed. As the hardened state tests, the scanning electron microscope, compressive strength, flexural strength and split tensile strength tests are conducted. Also, the water absorption, porosity, and ultrasonic pulse velocity tests are performed to measure durability. Furthermore, SCRC's energy absorption capacity is evaluated using the falling weight impact test. The statistical significance of content and size fraction of WTR fiber on SCRC is evaluated using the analysis of variance (ANOVA). As the general conclusion, implementation of various size fraction WTR fiber as fine aggregate showed potential for producing concrete for construction applications. Thus, use of WTR fiber in concrete is suggested for safe, and feasible waste tire disposal.
Key Words
    ANOVA; impact energy; microstructure; self-compacting concrete; waste rubber; water permeability
Akshay A. Thakare: Department of Civil Engineering, Indian Institute of Technology Indore, Simrol, Indore, 453552, India
Salman Siddique: Department of Civil Engineering, Center for Advanced Construction Materials, University of Texas at Arlington, Nedderman Hall, Arlington, TX 76010, USA
Amardeep Singh: Department of Civil and Architectural Engineering, Changzhou Institute of Technology, Jiangsu, 213032 China
Trilok Gupta: Department of Civil Engineering, College of Technology and Engineering, Maharana Pratap University of Agriculture & Technology, Udaipur, 313001, India
Sandeep Chaudhary: Department of Civil Engineering, Indian Institute of Technology Indore, Simrol, Indore, 453552, India; Center for Rural Development and Technology, Indian Institute of Technology Indore, Simrol, Indore, 453552, India

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