The application of steel fiber reinforced concrete in bridge deck pavement serves as a typical case. During the construction process, the excellent performance of steel fiber reinforced concrete is fully demonstrated. Its material selection and construction application significantly enhance the service life of bridge deck pavement and exhibit remarkable performance in practical engineering.

During the construction process, the selection of steel fiber specifications is crucial. The range of steel fiber diameters varies according to different application scenarios, and these choices need to be tailored to specific situations to ensure they meet the engineering requirements. Steel fibers with diameters ranging from 25 to 35 millimeters are commonly used for various engineering needs, while in different scenarios, the range may extend to 30 to 80 millimeters or even wider.

After the incorporation of steel fibers, the performance of ordinary concrete has been significantly improved. Especially for milled steel fibers, their technical and application characteristics are manifested in multiple aspects: Before concrete cracking, steel fibers can already play their role, significantly enhancing the crack resistance of concrete and preventing the penetration and development of internal microcracks. Furthermore, steel fibers can improve the crack resistance, compressive strength, tensile strength, and other properties of concrete, significantly enhancing the durability of the project. They can also effectively improve various strength indicators of concrete, including a 5% to 20% increase in compressive strength, a 20% to 40% increase in tensile strength, and a 20% to 50% increase in flexural-tensile strength. At the same time, the wear resistance is improved by about 40%, the crack resistance under impact load is increased by 3 to 4 times, and the flexural-tensile fatigue strength is also increased by 1.65 to 2.25 times. These technological advancements bring significant economic benefits, reducing the original design slab thickness and saving the cost of plain concrete leveling layers.

Ultra-high strength steel fiber construction

Mixing and transportation

When mixing steel fiber reinforced concrete, special attention should be paid to ensuring its uniformity and preventing the steel fibers from sinking, in order to guarantee the quality of the concrete. During the mixing and transportation of concrete, uniformity should be maintained to prevent steel fiber sinking and concrete segregation. The feeding sequence and method are basically the same as for conventional concrete, but due to the characteristics of steel fibers, care should be taken to prevent clumping. The method of first dry mixing and then wet mixing should be adopted, the mixing time should be extended, and measures should be taken during transportation to prevent segregation caused by vibration.

On-site construction control

At the construction site, appropriate vibrating equipment is required to ensure that the concrete surface is free of exposed steel fibers and meets the design quality standards. Typically, an automatically traveling full-width vibrating beam is used for continuous pouring to prevent the formation of construction cold joints. After pouring, necessary processes should be followed to ensure that the surface is free of exposed or upright steel fibers. Texture pressing or hard grooving treatments are required, and precise material measurement and performance testing are conducted to ensure that the quality meets the design requirements.