An Experimental Study On The Properties Of Steel Fiber Reinforced Concrete At Early Ages

Steel fiber reinforced concrete(SFRC) is a new compound civil engineering material. Its properties have been studied deeply in recent years. Comparing to the knowledge of the fully-hardening SFRC, we know very little about its properties in the early ages. For the need of the rapid repair of the airport runways, we have this experimental project to investigate the strength development of the SFRC in the early age, the development of the modulus of SFRC and the effect of the early-age loading on its strength development.Test results show that the steel fiber in concrete have more effectiveness on improving the splitting tensile strength and the flexural strength in the early age than after its hardening; the flexural modulus of elasticity of SFRC are higher than the plain concrete at different ages while their compressive modulus of elasticity are almost the same. It's also shown that, similar to the plain concrete, the early-age loading decreases the strengths of SFRC, but, with the increase of the contents of the steel fiber things are getting better, especially for the splitting tensile strength and the flexural strength.The phenomena stated above are explained in details based on the existing theories of SFRC. The test data provides the experimental basis for the application of SFRC in engineering practice.