Title: Impact Performance of Recycled Rubber Tire Chip and Fiber-Reinforced Cementitious Composites

Author(s): Victor Lopez, Mi G. Chorzepa, and Stephan A. Durham

Publication: Symposium Paper

Volume: 347

Issue:

Appears on pages(s): 191-214

Keywords: cementitious composites, fiber reinforced concrete, FRC, rubberized concrete, energy dissipation, impact, macro fiber, steel fiber, recycled tire chip

DOI: 10.14359/51732665

Date: 3/1/2021

Abstract:

This paper presents the drop-weight impact performance of recycled tire chip and fiber-reinforced cementitious composites. Emphasis is placed on maximizing the energy dissipation capacity of rubberized fiber reinforced concrete (FRC) mixtures subjected to impact forces for the purpose of improving the impact resilience of concrete elements such as concrete traffic barriers and other applications. The first part of this study involved smallscale testing of preliminary mixtures to optimize compressive strength, modulus of rupture, and impact resilience using a fixed percentage of tire chip replacement of the coarse aggregate and varying volume fractions of steel, polypropylene, and polyvinyl alcohol fibers. Rubberized FRC beams were then tested under static loads to maximize the static energy dissipation potential of steel fiber inclusion at varying tensile steel reinforcement ratios. The final part of this study involved performing scaled drop-weight impact tests on reinforced concrete beam. Results confirmed that rubberized and/or fiber reinforced cementitious composite members exhibit significantly improved energy dissipation capacity and impact resilience, particularly with 1.0% steel fiber addition and 20% tire chip replacement. It was observed that more energy was dissipated through the steel fiber addition alone than FRC mixtures with the tire chips.