Experimental Research On Time-Dependent Regularity Of The Recycled Concrete Strength

In recent years,due to the increasing of urban houses renewal and municipal relocation,a large number of old buildings are demolished.If thoes construction wastes are thrown away,not only polluting the environment,but also taking up a lot of arable land,which also waste the resources.It brings to us a question,how to reasonable use these old construction waste ?Usually the waste concrete after cleaning,crushing,grading and cooperating with each other by a certain percentage,which called recycled aggregate,and the use of recycled aggregates as a part or all of the preparation of concrete aggregate are called recycled concrete.The recycled aggregate have a rough surface,edges and corners are more large,water absorption and crushing index are too large,and the surface of the particles wrap some slurry,which different from the characteristics of natural aggregate,and which lead to the physical and mechanical properties of recycled concrete different with ordinary concrete more or less.Research on the recycled concrete technology is still in its infancy,most of the researchs are focused on the study of basic performance of recycled aggregate and recycled concrete,but the results are not the same,and the results of the current study are not enough to summarize the basic properties of the recycled aggregate and the recycled aggregate concrete,which can guide the production of the engineering.The paper reference to foreign research results,and bases on the status of the domestic research at the same time,mainly studies the recycled concrete mix design and basic mechanical properties related experiment of recycled concrete,and the influencing factors and time-varying regularity of the recycled concrete cube compressive strength,tensile splitting cube strength,axial compressive strength,this test have 14 ages,which are 3d,7d,14 d,28d,42 d,56d,70 d,90d,120 d,150d,180 d,210d,240 d,270d.Through experimental data analysis of recycled concrete time-varying regularity and intensity of the fitting formula,providing reference for the application of recycled concrete engineering and technical design.