Standardizing Study On Concrete Freeze-thaw Tests Under Different Environments

The problems of concrete durability have long been the hotspot in the civil engineering specialties, and the frost damage problem is a major concern. In this thesis, the author put forward a new concept-the standard method. Based on this method, a series of experiments were carried out to analyse the performance of concrete under different environments.In the preface, the concrete durability problems together with the background and current situation of this project were introduced. The factors that influenced the anti-frost durability of concrete structure were given. Baced on these research briefs both at home and abroad, the author conducted an in-depth study on the mechanism of frost damage.There were two standard environments in the experiment study, which were defined as standard water environment and standard salty environment respectively. The performance of the standard specimen was analyzed under these two environments. According to the datas of the standard specimen, some parameters were adjusted, such as the material and environment. In these experiments, the influence of water-cement ratio, the substitution rate of fly ash and the curing period was considered. The damage of concrete was evaluted through the measuring of mass loss and dynamic elastic modulus loss of the specimen. The results and conclusions of the thesis had a guiding significance for both the durability region division and life span predicting of concrete.