Experimental Study On Cracking And Fracture Properties Of High Strength And Wearable Concrete

In this paper, the main item that we researched is the experimental Study on cracking and Fracture Property of High Strength and Wearable Concrete.As the development of highway, the concrete that currently used have already been incapable of engineering use. So, in this paper, the author tries to make a new concrete which have the high strength and good wear ability by modulating the quantity of mineral admixture, usage of high performance water-reducing agent.Mechanical properties are one of the key properties of concrete. In this paper, the author researches the mechanical properties of this concrete, evaluates if this concrete is achieving the request of highway, seeks the rule of mechanical properties0, and the relations between some mechanical properties.The question of early-age cracking is a very important question for the concrete used in highway. In this paper, the author tries to modulate the quantity of mineral admixture, use the high performance water-reducing agent, and value the cracking performance of the concrete through by free-shrinkage test and ring test.The ultimate tensile strain is meaning the biggest strain at the time that concrete destroy. It's a important factor of concrete's cracking. In this paper, the flexural tensile strain test is applied to study the flexural tensile strain of the high strength and wearable concrete, and then try to find the rules of it.As the development of the structure designing method, more and more attentions are paid to the facture properties of concrete. As a result of the force that the highway gets, when there comes some cracking, it's the same to the facture experiment. So the facture properties become a key point of this research. In this paper, three point beam test based on double K fracture parameters model was applied to study the fracture properties of the high strength and wearable concrete, the author calculates the parameters of double K fracture parameters model, and try to find the rules of it. This research was supported by the National Education Ministry Special Funds for College Doctor Station "Research of the Influence of Early Time Dehiscence Sensitivity and Micro Crack Evolution Rule to Service Performance for Modern Concrete Structure" (Authorized NO.20070335087) and "863" program of National Hi-Tech Research Development "Durability Test Technology of Large-Scale Civil Engineering Infrastructure under Combined Environment" (NO.2006AA04Z415).