Long-term loading examinations in connection with the law of linear creep

Abstract

The failure process of concrete is usually described by the relative volume change function. The initial part of this function is constant. Balázs has named the upper limit of the constant part sigma_ka (lower critical stress). His hypothesis is that, until this point is valid the law of linear creep. With the reviewed pre-experiments we examined the validity of this hypothesis. Due to this reason high strength concrete was long-term loaded up to 30; 50; 62 and 75% of the prism strength and the properties of the concrete were examined. According to the experiment the law of linear creep is probably valid until 0.50R/R_c,pr value, but it has to be proved by further experiments.