Title:
Investigation on Impact-Resistant Behavior of Geopolymer Concrete Beams
Author(s):
Fen Zhou, Jian Fang, Yunxing Du, Caijun Shi, and Hao Wu
Publication:
Structural Journal
Volume:
121
Issue:
6
Appears on pages(s):
161-173
Keywords:
drop-weight impact test; dynamic failure criterion; geopolymer concrete (GC) beams; impact shear mechanisms in reinforced concrete beams under impact loading response; midspan deflection
DOI:
10.14359/51742154
Date:
11/1/2024
Abstract:
This study investigates the impact resistance of performance-based
geopolymer concrete beams through drop-weight impact tests.
Three ordinary portland cement (OPC) beams and 12 geopolymer
concrete (GC) beams were tested, considering several research
factors, such as concrete strength, longitudinal reinforcement ratio,
stirrup ratio, and drop height. The experimental findings indicate
that increasing the longitudinal reinforcement ratio or stirrup
ratio within a certain range can effectively mitigate damage and
deformation in GC beams subjected to impact loading. Furthermore,
an increase in strength was observed to result in decreased
midspan and residual displacement, while a deflection prediction
formula with high accuracy and low dispersion was developed for
designing impact-resistant GC beams with an error of no more
than 5.5%. Lastly, a dynamic damage criterion for GC beams is
proposed to assess their damage under impact loading.