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:
121
Issue:
5
Appears on pages(s):
147-160
Keywords:
axial capacity; concentric column; crumb rubber (CR); ductility; failure mode; polypropylene (PP) fiber; recycled coarse aggregate (RCA)
DOI:
10.14359/51740860
Date:
9/1/2024
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 150 x 150 x 950 mm in size were tested under uniaxial compression loading. Test parameters included 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 rubberized 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.