Application and crack resistance testing of wave shaped fiber reinforced concrete slipform paving construction
Adopts the sliding mode paving technology to study its application and crack resistance testing in the construction of wavy fiber reinforced concrete.The design parameters for the steel fiber reinforced concrete mix ratio are selected as follows:water cement ratio of 0.46,steel fiber volume ratio from 0.85％to 1.25％,and sand content of 818 kg/m3.The steel fiber concrete mixer is equipped with a steel fiber dispersion device to evenly mix cement,steel fibers,and coarse and fine aggregates.Water is added for wet mixing,and the mixing time is 2 minutes.The mixing amount at a time cannot exceed 85％of the rated mixing amount.The unloading of steel fiber concrete mix-ture from the mixer to the completion of paving should not exceed 45 minutes.The vibration frequency should be higher than that of ordi nary concrete paving to ensure the continuity of the paving process.When the slump is 30 mm,the loose laying coefficient is controlled at around 1.1.Depending on the weather conditions,the length of the fabric and discharge is controlled between 5 m and 10 m.In the post crack stage,it can be seen that fiber reinforced concrete materials have higher levels of deformation capacity and fracture energy compared to plain concrete materials.
slipform paving technologyfiberconcrete constructioncrack resistance test
万方数据
维普
