| Abstract: | Exposure to environmental conditions can significantly influence the mechanical behavior of concrete structures in civil engineering.
In this study, the effect of environmental factors, such as moisture and temperature, on the strain-rate sensitivity of concrete
mixtures was systematically investigated. The strain rate varied from 10−5s−1 to 10−2s−1. From the investigation it was concluded that moisture content had a significant influence on the strain-rate sensitivity
of concrete. With regard to concrete with low moisture content, temperature had little influence on the rate-dependent behavior;
while for fully saturated specimens, a significant influence was observed. These phenomena were attributed to the meso-scale
bonding properties of the concrete matrix. Equations were derived to characterize the ultimate strength increment of concrete
with strain rate under different environmental conditions. An explanation to the dynamic failure mechanisms of concrete based
on the experimental findings was proposed. |
