Theoretical and Experimental Determination of the Crack Width in Reinforced Concrete at Very Low Temperatures

摘要

The compressive strength, the tensile splitting strength, the stress strain relationship and the thermal deformation of concrete are determined experimentally as a function of temperature. Theoretical formulae are derived based on the classical bond stress-slip theory to predict crack width and spacing in a reinforced tension member at very low temperatures. The model is based on the local bond stress-slip relationship, which is determined experimentally as a function of temperature and curing conditions. It has been proven that realistic crack widths can be calculated using the tension member model. Furthermore a model is derived to predict the ultimate bond stress in case splitting failure occurred as a function of concrete cover and temperature. The lowest bond strength relative to the actual splitting strength is predicted at -40 and -80C.