Experiment Study Of Steel Fiber Reinforced Regenerated Concrete's Mechanical Properties

The steel fiber reinforced concrete is recently a kind of new structural material and is a king of new compound material that is formed by adding the proper amount of steel fibers into ordinary concrete. It can be poured and can be ejected to form some shapes. It has better physical mechanical properties than ordinary concrete except for compressive resistance. It can make ordinary concrete that is a kind of brittle material be changed into a kind of compound material that has better plasticity. Its main working mechanism is to improve the brittleness of ordinary concrete by using short fibers that are scattered equably. Because short fibers have higher tensile resistance and ordinary concrete has higher compressive strength in the process of loading, every technical property of fiber reinforced concrete is improved greatly. Accordingly steel fiber reinforced concrete has better stressing properties such as crack resistance, bending resistance, anti-fatigue, anti-friction and high toughness. So it has brilliant future in highway surface,road surface of aerodrome and architectural construction. At first the application and theory of steel fiber reinforced concrete at home and abroad are analyzed in this paper. Then, based on the basic theories of fiber reinforced concrete, mechanical properties and strength theories of steel fiber reinforced concrete are studied systematically. The main research outputs of this paper are as follows:1. The type and the form of steel fiber in concrete are described and analyzed and the mechanism of steel fiber reinforced concrete such as reinforcement, damage and cracking resistance is discussed.2. Four different types of specimens of steel fiber reinforced concretes and two corresponding plain concretes are subjected to compressive, splitting tensile and 4 point bending tests. The results show that the compressive strength, splitting tensile strength and flexural strength increase respectively with the addition of steel fibers, but the compressive strength increases little compared with the splitting tensile strength and flexural strength; for the same kind of steel fiber reinforced concrete, the compressive strength, splitting tensile strength and flexural strength of steel fiber reinforced regenerated concrete are higher than those of steel fiber reinforced pebble concrete; the load-bearing capacity of blended steel fiber reinforced concrete is less than that of single dimension steel fiber reinforced concrete; the use of steel fiber reinforced regenerated concrete whose aggregate is made of regenerated concrete can not only turn waste into treasure, but also reduce environmental pollution and realize the recycle of resources, and its load-bearing capacity is far higher than that of steel...