Research On Impact Mechanical Properties Of Slag And Fly Ash Based Geopolymeric Recycled Aggragate Concrete

As the most used material in engineering structure,concrete materials,the use of concrete puts forward requirements for ecology,resources and environment.Slag and fly ash based geopolymeric recycled aggregate concrete(SF-GRAC),as a new green building material,can not only recycle waste solid concrete,but also utilize industrial waste slag,slag and fly ash.In the process of using the concrete structure,in addition to the static load of the structure itself,it will also be subjected to loads such as earthquakes,automobiles,and explosions.Therefore,it is of great significance to study the mechanical properties of geopolymer recycled concrete under static and i MPact conditions.The main content of this paper is as follows:(1)With different slag content(10%,15%,20%,25%,30%,35%and 40%)and different recycled coarse aggregate replacement rates(0%,30%,50%,70%and 100%)as a variable to study the conversion relationship between the strength of the cube,the cylinder and the prism in the static state of the geopolymer recycled concrete,and put forward the conversion formula.(2)Study the stress-strain full curve of geopolymer recycled concrete,analyze the failure form of the prism,fit the full stress-strain curve,and establish the relationship between the parameters of the constitutive model and the replacement rate of recycled coarse aggregate The relationship formula between.(3)Conduct impact performance tests on geopolymer recycled concrete,analyze DIF,and analyze and study the dynamic stress-strain curve and failure form after the test.(4)The impact constitutive model of geopolymer recycled concrete is studied,the constitutive model is fitted,and the difference between DIF_σ and DIF_ε,slag content and recycled coarse aggregate under different strain rates Analyze the relationship between fitting strain rate and DIF.