Research On The Creep Properties Of High Strength Self-Consolidating Concrete In High-Rise Buildings

Creep and shrinkage are two of fundamental time-dependence properties of concrete,which are link to problems of volume stability.As parameters related varies in most cases,it is not practical to analyze the mechanism of creep with a perfect theory.More universally,we can use predicting models,which show a mathematic connection between creep strain and basic parameters,to estimate the influence on engineering.The vertical creep deformation of high-rise buildings accumulated by long-time construction can confuse engineering management,which may lead to unnecessary accidents.High strength self-compacting concrete(SCC)is one of building materials widely used in the construction of high-rise buildings.With low water binder ratio,large volume of mineral admixtures,high sand ratio and small nominal maximum size of aggregate,the creep characteristics of high strength SCC should be different from those of conventional concrete(CC).It is important for the safety and deformation simulating of construction to discuss these properties with experiments.The contradistinction of experimental data and predicting models are included in this article.As a result,there is a significant difference between experimental data and the calculation based on model codes.Due to the distinction of experimental standards,it is necessary to provide local predicting model with experimental data in China.A series of experiments are designed and carried on according to the mix ratio of high strength SCC of Pingan International Finance Center.With these data and more others,a revision of empirical parameters in B3 model is provided by numerical fitting in Matlab.Moreover,we test the accuracy of this model revised by coefficients of variation,and the comparing observational results with predictions.The new model shows satisfying accuracy.