The C50 concrete strength standard refers to the compressive strength of concrete specimens formed by 150 * 150 * 150mm test molds after curing for 28 days at a temperature of 20 ± 2 ℃ and a relative humidity greater than 95%, reaching or exceeding 50MPa. The formula upstairs is used in the laboratory to calculate the strength of the mix during mix design.

The fiber volume fraction of ordinary steel fiber reinforced concrete is between 1% and 2%. Compared with ordinary concrete, the tensile strength is increased by 40% -80%, the bending strength is increased by 60% -120%, and the shear strength is increased by 50% -100%. The increase in compressive strength is relatively small, generally between 0-25%, but the compressive toughness is greatly improved.

Steel fiber reinforced concrete is a new type of multiphase composite material formed by mixing randomly distributed short steel fibers into ordinary concrete. These randomly distributed steel fibers can effectively hinder the expansion of micro cracks and the formation of macro cracks inside the concrete, significantly improving the tensile, bending, impact, and fatigue resistance of the concrete, and exhibiting good ductility.

C50 steel fiber reinforced concrete mix ratio:

The volume of aggregate in concrete accounts for about 3/4 of the volume of concrete. Due to its considerable volume, the quality of aggregate has a certain impact on the technical performance and production cost of concrete. When preparing C50 concrete, the strength, gradation, surface characteristics, particle shape, impurity content, water absorption rate, etc. of aggregate must be carefully inspected and strictly selected. This is the only way to prepare C50 concrete that meets the technical performance requirements, while also reducing the production cost of concrete.