Creep and Shrinkage Prediction Model for Analysis and Design of Concretetructures: Model B3

This paper presents a model for the characterization of concrete creep and shrinkage in design of concrete structures (Model B3), which is simpler, agrees better with the experimental data and is better theoretically justified than the previous models. The prediction model B3 is calibrated by a computerized databank comprising practically all the relevant test data obtained in various laboratories throughout the world. The effect of concrete composition and design strength on the model parameters is the main source of error of the model. A method to reduce this error by updating one or two model parameters on the basis of short time creep tests is given. The updating of model parameters is particularly important for high strength concretes and other special concretes containing various admixtures, super plasicizers, water-reducing agents and pozzolanic materials. This new model allows a more realistic assessment of the creep and shrinkage effects in concrete structures, which significantly affect the durability and long time serviceability of civil engineering infrastructure.