Medium Strength Recycled Concrete C40～C55Test Analysis And Mathematical Model Assessment About Strength-Time

Along with the fast development of the national economy and the infrastructure, the processing that abandon the coneret causes the people’s concern more and more. But the creation and developments of the recycle coneret technology, found out a new way that can keep on the development for the concrete engineering. It have already become a brand-new direction of the engineering material and the structure development, and it is the new hot point that most countries scientist study.The research on basic mechanical properties of recycled concrete mainly include compressive strength,tensile strength,rupture strength and modulus of elasticity,etc. To provide valuable test data for realizing the effective recycling and reusing wasted concrete.This paper gives compressive strength test on standard cubic specimen of ordinary concrete and recycled concrete, adding up to396test-components, which recycled concrete including only mix a kind of additive,admixture and mixed with three kinds of additives,admixtures, set ages to1~28day(C55), others respectively1,2,3,4,5,7,14and28day. During the experimental process, I observed the destructive process and form of recycled concrete, and contrast to the compressive performance of ordinary concrete, focuse on discussing the influences to compressive strength of recycled concrete from various additives,admixtures, experimental results show that the most conspicuous effect from water reducer, followed by silicon ash,fly ash. This paper also conduct experiments of flexural strength, tensile strength and modulus of elasticity.Through test the recycled concrete RC55cube compressive strength, this paper focuses on exploring compressive strength development law of recycled concrete with the change of the ages. Meanwhile, using the software SPSS establish the relational expression between compressive strength and the ages of recycled concrete RC55after doing the regression analysis between ages coefficient and ages. In this paper, several common mathematical models also are used to fit the trend of changed intensity with age, and compared the fitting precision.