Title: Uniaxial Compressive Behavior of Fiber-Reinforced Rubberized Recycled Concrete Column

Author(s): Md. Shahjalal, Kamrul Islam, Mohammad Tiznobaik, M. Shahria Alam and Raquib Ahsan

Publication: Structural Journal

Volume:

Issue:

Appears on pages(s):

Keywords: axial capacity, concentric column, crumb rubber, ductility, failure mode, polypropylene fiber, recycled coarse aggregate

DOI: 10.14359/51740860

Date: 6/3/2024

Abstract:
The concrete industry is increasingly adopting the production of environmentally sustainable green concrete. Using recycled coarse aggregate (RCA) produced from demolished concrete infrastructures and waste tire-derived crumb rubber (CR) in the concrete mixture provides a sustainable construction practice and can enhance structural performance. This study investigates the uniaxial compressive behavior of concrete columns composed of RCA, CR, and polypropylene (PP) fiber. A total of 26 columns having 150×150×950 mm size were tested under uniaxial compression loading. Test parameters comprised longitudinal reinforcement ratio (0, 1.4, and 2.0%), tie spacing (75 and 150 mm), CR content (0, 5, 10, and 15% of the volume of natural fine aggregate), and percentage of PP fiber (0 and 0.5% of the volume of the total mixture) with 30% RCA replacement (by weight of natural coarse aggregate). The compressive behavior, failure mechanism, influence of longitudinal and transverse reinforcement, dilation, ductility, and toughness were examined. This study demonstrated that incorporating fiber into the concrete made with RCA and CR waste materials improved the axial capacity, resulting in fiber-reinforced recycled concrete (FRRC) columns with enhanced ductility and toughness. These findings support the development of sustainable concrete for structural columns, justifying their applicability to existing design codes.