EXPERIMENTAL STUDY ON THE DEFORMATIONS FOR SHRINKAGE AND CREEP OF BEAMS IN NON-GLUED PRESTRESSED HIGH PERFORMANCE FLY ASH CONCRETE BRIDGES

Using the construction of the railway between Luoyan and Zhanjiang as background,based upon the experimental results of shrinkage and creep of eight non-glued concrete beams with different mixtures of high-performance fly ash,the shrinkage,creep and camber of beams with different mixtures of high-performance fly ash concrete under long-term loadings are investigated.The effects of the environmental factors such as temperature,humidity are also explored,the experimental results over 300 days indicate that the non-glued concrete beams with 20%～40% high performance fly ash not only have better workability and mechanical properties,but also exhibit better long-term performance.Compared with concrete beams of same strength but without fly ash,they have higher late-stage strength and compressive elastic modulus,lower shrinkage and less creep with desirable social and economic profitability.