Historical overview of fiber concrete and its use today (I)

After more than a century of research and practice, concrete technology has made rapid development, concrete materials have become the largest amount of engineering construction today, the most widely used engineering materials. Over the years, in the development of concrete technology, the compounding of the material structure, has been considered one of the important directions of development, such as the addition of sand, stone, and additives; in the concrete with fiber is a rapidly developing material compounding technology in recent years.

 

What is fiber concrete?

Fiber for construction is a thin and long material with a length-to-diameter ratio of 100 or more, and has a certain tensile strength (also known as breaking strength), modulus of elasticity (also known as initial modulus) and ultimate elongation (also known as elongation at break). In the construction of the application of fiber, mainly refers to the concrete in the uniform distribution, and can strengthen the concrete structure, short sections of discontinuous fiber material.

According to the different fiber materials used can be divided into: Natural or artificial fibers; organic or inorganic fibers, etc. Specifically, they can be divided into natural organic fibers (a variety of hemp fibers, wood pulp fibers, coconut shell fibers (collectively known as cellulose fibers) and animal bristles, etc.); natural inorganic fibers (asbestos fibers, needle silica, etc.), man-made organic fibers, and man-made inorganic fibers (metal fibers, glass fibers, basalt fibers, mineral wool fibers, and carbon fibers, etc.). If the fiber modulus of elasticity used according to the difference, that is, the fiber modulus of elasticity is higher or lower than the modulus of elasticity of the matrix it is mixed with, the corresponding can be divided into two categories of high modulus fiber and low modulus fiber; if it is mixed with different matrix materials, and can be divided into: cement concrete with fiber, mortar (cement net slurry) with fiber, asphalt concrete with fiber.

Fibrous concrete can be seen as a concrete made of ordinary concrete, mixed with a certain amount of shorter, uniformly dispersed and discontinuous fibers, and compounded with it. The combination of fibers and concrete base material improves the inherent weaknesses of concrete and has a multifaceted impact on concrete performance. The improvement of the crack resistance and durability of fiber concrete is of great significance to the construction of high quality, beautiful and durable projects.

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