in situ measurement of concrete creep and shrinkage in ambient subarctic weather

Concrete creep and shrinkage at cold temperatures are less significant than those at room temperature. for the structures exposed to subarctic weather, in situ creep and shrinkage strains are important factors in design process, such as estimating pre-stress losses, since ambient temperature and relative humidity change in a wide range. in the present study, the in situ creep and shrinkage strains were measured from high strength concrete specimens loaded in a concrete creep frame exposed to subarctic weather for 332 days. the measured creep strain was 23–30% of creep strain from specimens at room temperature. also, the shrinkage strain was 67% of the shrinkage strain measured at room temperature. the comparison showed that the creep and shrinkage strains in real subarctic weather were larger than strains at a sustained cold temperature, but they were substantially smaller than strains at room temperature. the measured strains were compared with predicted values from widely used creep and shrinkage models. the aashto-lrfd model and the ceb mc90-99 model matched well with test results. © 2021, iran university of science and technology.