Introduction of 1 steel fiber reinforced concrete<br>(1) concrete is a composite material made of gel material, aggregate and water in proper proportion and hardened after a certain period of time. It has the advantages of strong plasticity, good grip, good economic efficiency, high safety, good fire resistance, good durability and low cost. However, the defects of single concrete such as self weight, low tensile strength, high brittleness and poor ductility limit its wide application.<br>(2) In order to improve the performance of concrete, the ideal measure is to add steel fiber into the concrete mixture to enhance the mechanical properties of concrete. This kind of concrete is called steel fiber reinforced concrete (SFRC). Steel fiber is a kind of small steel wire whose diameter ratio is between 40 and 80, which is distributed randomly in concrete.<br>(3) Steel fiber reinforced concrete effectively makes up for some defects existing in ordinary concrete and greatly improves the performance of ordinary concrete. Its structure is uniform and continuous, with large specific surface area, which can increase the friction of steel fiber surface; The obvious increase of C content in steel fiber reinforced concrete can effectively prevent the expansion of cracks, improve the tensile and compressive strength (less increase) and durability (impermeability, frost resistance, corrosion resistance, carbonation resistance), bending resistance, crack resistance, toughness and impact resistance of concrete structure, and greatly extend the design service life of concrete structure.<br>
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