Historical Overview of Fiber Concrete And Its Use Today (III)

Research and application of fiber concrete.

Substantial progress in the research and application of fiber concrete, thanks to the development of synthetic fiber production technology. Into the early 1960s, the United States S. Goldfein began to explore the use of synthetic organic fiber – polypropylene fiber as an admixture of cement concrete, and recommended for the U.S. Army troops to make explosion-proof structural components. early 1970s, the United Kingdom will be mixed into the concrete polypropylene fiber to make pipe fittings, sheeting and other products, and in the construction industry, the development of relevant standards. In the last two decades, the United States as the representative of the technically developed countries to develop and produce a series of monofilament synthetic fibers can be mixed into the concrete; such as the United States vigorously develop synthetic fibers used to enhance the concrete, mainly polypropylene fibers and polyamide fibers, etc.; Germany and Japan were developed to enhance the concrete polyacrylonitrile fibers and polyvinyl alcohol fibers; the United States Grace Corporation, Japan’s TORASUTOKIKAKUKI, etc. have also introduced the corresponding asphalt concrete with enhanced fiber.

The U.S. Grace Company in 2003, the patent US6569526, CN1405110, reported a highly dispersible reinforced synthetic fiber, the fiber can be applied to concrete, mortar, shotcrete and asphalt concrete and other matrix materials, not only has good dispersion, and can significantly improve the strength of concrete materials. In the past, people mixed into the concrete fibers such as most plant fibers, most of them can not withstand the strong alkali in the concrete base material, or because they can not be uniformly dispersed in the concrete, or do not have a certain high-temperature resistance to achieve the desired effect of anti-cracking, strengthening. Synthetic fiber production technology advances to solve these problems one by one. In recent years, synthetic organic fibers in the high tensile strength, and alkali resistance of polypropylene fiber and polyamide fiber, despite the weakness of their relatively low modulus of elasticity, but they can inhibit and reduce the occurrence and development of cracks in the initial plastic phase of concrete features, so that its application in concrete has made great progress. Synthetic fibers are added to concrete, while also improving the permeability, frost resistance, impact resistance, ductility, abrasion resistance, etc., and have been widely used in the construction field due to the ease of construction, easy to operate, and moderate prices.

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