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What is the benefit of using steel fibers over synthetic macro fibers?

What is the benefit of using steel fibers over synthetic macro fibers?
Update Time:2018-01-23
Mechanically anchored steel fibers have been proven as reinforcement, even for structural application. Steel fibers are made from a material with well known engineering properties; e modulus, Poisson’s ratio, tensile strength and creep. the e-modulus of steel is greater than that of concrete. thus, the steel fibers pick up the stresses quickly and affect the cracking process immediately. the long term load carrying capacity of the steel fiber reinforced concrete is significant. Steel fibers have a material specification of AStM A820. Macro synthetic fibers come in a large variety and have very different material properties. Macro synthetic fibers do not have a material specification in AStM. All macro synthetic fibers do have an e-modulus lower then that of concrete and relatively low tensile strengths. thus, macro synthetic fibers need a certain crack width to occur prior to being able to engage in the concrete and then only moderate post crack strength values can be achieved. Macro synthetic fibers are also subject to creep which makes the long term loading capacity of the fiber lower or non existent. the rate of creep can be increased with increased ambient temperatures.

There are at least four factors to review when considering reinforcement; Modulus of elasticity, Poisson’s ratio, tensile strength and creep.
Company Profile
Dalian Harvest Metal Fibers Co., Ltd. is a Sino-France joint venture company , a specialty in producing thermal resistant steel fibers, and steel fibers for concrete reinforcement. HARVEST steel fibers have been well adopted by a wide range of professionals, such as Metallurgy, Cement, Petrol refinery, Chemistry, Ceramics, and so on. Steel fibers have been well used in concrete construction projects, such as  bridges, tannels, high ways, airport,  power stations, industrial floors. More than 90% of HARVEST steel fibers have been used by our customers in Asia, Europe, North and South America,  Australia, etc… . HARVEST has been winning the users high praise because of high quality products and good services.