Title:
Beam-Column Joint Retrofitting Using Basalt Fiber- Reinforced Polymer Grid and Cementitious Matrixes
Author(s):
Chhoung Lim, Yeongseok Jeong, and Minho Kwon
Publication:
Structural Journal
Volume:
121
Issue:
1
Appears on pages(s):
133-146
Keywords:
basalt fiber-reinforced polymer (BFRP) grid; engineered cementitious composite (ECC); fabric-reinforced cementitious matrix (FRCM); high-strength mortar; joint failure
DOI:
10.14359/51739190
Date:
1/1/2024
Abstract:
This paper focuses on retrofitting reinforced concrete (RC) beamcolumn joints using a new method—namely, fabric-reinforced
cementitious matrix (FRCM). This method is expected to be a
substitute for externally bonded FRP, as it works better in a moist
and flammable environment. In this study, basalt fiber-reinforced
polymer (BFRP) grids were used as reinforcement and highstrength
mortar and engineered cementitious composites (ECCs)
were used as a cementitious matrix. ECC is ductile and good
for crack distribution. High-strength mortar is good for its high
compressive strength, applicability, shrinkage resistance, lack of
pores, and high bonding strength. The retrofitted specimens were
originally fabricated by taking out the concrete cover around the
joint area, and it was filled back by the cementitious matrix to make
up the original dimension using two different retrofitting types.
As a result, the overall performances of the retrofitted specimens
were improved regarding failure level, ductility, energy dissipation,
strength, and stiffness degradation. The working mechanism of the
retrofitted specimen tended to change as the stress concentration
also attempted to shift from joint to beam for the ECC specimen.