How to Use Steel Fibre Efficiently?

1. Steel fiber is easy to affect the quality of the project due to uneven mixing

Because the steel fibre has hooks at both ends, it is easy to agglomerate or be unevenly distributed during mixing, which will affect the quality of the project. Therefore, it is very important to ensure a reasonable mix ratio and mixing process.

The flatness error of the floor surface of steel fiber reinforced concrete is required to be within 3mm, and the requirement for levelness is high, so how to control the flatness of the surface is another key point of the construction.

2. Ways to use steel fiber efficiently

When the formwork of steel fibre reinforced concrete is supported, a leveller should be used to strictly control the height of the topmark of the channel steel. After the formwork is supported, the part underneath the channel steel will be filled with C30 fine-stone reinforced concrete to prevent the concrete from leaking during vibrating and affecting the concrete strength. Vibration should be strengthened during concrete pouring. Because hooked steel fibre will hinder the flow of concrete, the vibrating time of steel fibre concrete is longer than that of ordinary concrete, and should generally be 1.5 times that of ordinary concrete. During the vibrating, a 5-meter-long plate vibrator (try to avoid the use of plug-in vibrating rods) is used to vibrate and compact the concrete until the slurry is produced, and a 2-meter-long scraper and a wooden trowel are used to smooth the concrete surface, keeping the error within 3 mm.

Steel fiber floor reinforced concrete is poured with a column spacing of 9 meters and a span of 4.5 meters wide. When the concrete is poured for 6 to 8 days in the sub-silo, and its strength reaches 12Mpa, the shrinkage joints are cut. During the cutting, a cutting machine is used to cut flat seams every 9 meters in the longitudinal direction. The cutting depth is 5 mm, the slit width is 3 to 5 mm, and the slit is filled with flexible materials.