International Concrete Abstracts Portal

Title: Effects of Freeze-Thaw Cycling and Sustained Load on FRP-Concrete Interface

Author(s): Jiawei Shi, Hong Zhu, Zhishen Wu, and Gang Wu

Publication: Special Publication

Volume: 275

Issue:

Appears on pages(s): 1-20

Keywords: concrete structure, durability, freeze thaw, FRP, bond interface, sustained load

Date: 3/1/2011

Abstract:
This paper presents an experimental investigation into the bond behavior between basalt FRP (BFRP) sheet and concrete substrate under coupled effects of freeze-thaw cycling and sustained load. Specially designed double-lap shear specimens were exposed to up to 200 freeze-thaw cycles with sustained load. After exposure, the specimens were tested to failure. Digital Image Correlation (DIC) test method was applied to capture the full-field strain in the study. Nonlinear constitutive law of FRP-concrete interface was determined based on full-field deformation and strain analysis. Test results show that freeze-thaw cycling leads to significant decreases in load carrying capacity, ultimate slip, shear strength and increases in effective stress transfer length of FRP-concrete interface. Additional damage is generated when the load condition is taken into account during freeze-thaw cycling test. Moreover, apparent changes in failure mode were found with the increasing number of freeze-thaw cycles.