Steel fiber function: The steel fiber used in the construction industry is usually a low-carbon steel cold-drawn fiber cutting type, which has no rust agent, anti-corrosion agent, etc., and can improve the function of casting by 2-6 times, replace or reduce the amount of steel, Shortened steel and fabrication time, the degree of mechanization of the construction schedule, can be achieved normally unachievable by construction methods, construction bays, roof cracking, plumbing leaks, etc. Cut steel fibers for use in highway bridges, concrete sleepers, explosion-proof warehouses, nuclear test sites, rocket launch sites, and more.
The volume ratio of stainless steel fiber reinforced steel will not enhance the effect, and to a certain extent, the minimum volume ratio of fibers of different types and different aspect ratios is slightly different, and the minimum volume ratio is usually 0.5% at home and abroad. The fiber volume ratio exceeds 2%, the processability of the mixture is more difficult, the construction is more difficult, and it is difficult to ensure the quality. But in special needs, through experiments and taking necessary measures to build quality assurance and reinforcement effects, the fiber volume rate will increase.
Adding proper fibers to concrete, its compressive strength is improved by 10%~80% (more than C50 concrete progress and significantly), 50%~100%, tensile strength is improved by 50%~80%, flexural strength is improved by 50%~80%, shear resistance Strength increases by 50% to 100%. Experiments show that the length of 5 ~ 15 mm, the ratio of length to diameter of 10 ~ 30, the compressive strength of short fibers and short fibers are improved, but the tensile strength and flexural strength of short fibers are much lower.
Except that the permeability function of steel fiber reinforced concrete usually does not change significantly compared with concrete, because fiber reinforced concrete has made significant progress in crack resistance, good integrity, freeze-thaw resistance, heat resistance, wear resistance and cavitation and corrosion resistance. . When fiber reinforced concrete is damaged, it is mainly the fibers that are uprooted rather than pulled, thus improving the bonding strength and matrix between fibers is the main controlling factor to improve the effect of fiber reinforcement.
