Title:
Structural Behavior of Low-Carbon and Functionally Graded Concrete One-Way Slab Strips
Author(s):
Jacob Yager, Joshua Woods, Evan C. Bentz, and Neil A. Hoult
Publication:
Structural Journal
Volume:
121
Issue:
4
Appears on pages(s):
149-159
Keywords:
digital image correlation; distributed fiber-optic sensing; functionally graded concrete; low-carbon concrete; one-way slabs; supplementary cementitious materials (SCMs)
DOI:
10.14359/51740715
Date:
7/1/2024
Abstract:
Supplementary cementitious materials (SCMs) have been used
to replace portland cement and are used in conjunction with
advanced mixture design approaches in reinforced concrete for the
purpose of creating low-carbon concrete (LCC). In this research,
functionally graded concrete (FGC) was used with LCC to provide
strength and serviceability for reinforced concrete one-way slab
strips by placing a higher-strength/stiffness concrete in the flexural
compression region and LCC in all other locations. The behavior
of FGC slab strips with varied connection types, placement
methods, reinforcement ratios, and ages were compared to uniform
specimens with different types of LCC and conventional concrete.
Behavior was evaluated through load deflection, cracking, and
strains during four-point bending, which were measured using
distributed sensing, including distributed fiber-optic sensing and
digital image correlation. Limited differences in behavior existed
among specimens with the same reinforcement ratios. However,
some FGC specimens had higher stiffness and ultimate capacity.
Implications of FGC, including cracking behavior at the interface,
are also discussed.