Study On Creep Of Concrete With Fly Ash

Fly ash,as a kind of mineral admixture,could not only reduce the consumption of energy and resources,lower the production costs and protect the environment,but also improve the physical and mechanical properties of concrete, especially the durability and creep performance.As a result,fly ash is widely used as an indispensable part of material and receives great attention.As a long-term performance of concrete,creep,which has a significant impact on concrete structures,especially the prestressed concrete structures,has been studied for many years.Although lots of researches about creep performance of concrete with fly ash have been done,there is not a comprehensive creep mechanism or an uniform mathematical model at present.It is necessary to do fur the researches about the creep performance of concrete with fly ash,which is very important to the practical engineering.In this paper,both theoretical and experiential methods are used to study the creep mechanism of concrete with fly ash.Theoretically,on the basis of comparing B3 model and the experimental data about creep of concrete with fly ash,a calculation method is present for considering the variation of fly ash contents by calculating the weight number and regressing the modify parameters of B3 model.Bye experiments,the effects of concrete composition,contents of fly ash and the water reducing agent are considered.The results of experiment are used to verify the theoretical model, demonstrating the feasibility of the model.