Study on the Properties of Polyformaldehyde Fiber Concrete Based on Steel Box Girder Bolting Zone
To improve the concrete strength and workability of the leveling layer for the 60 m anchor zone of the steel box girder of non-navigable bridge in the shallow area of the Shenzhen-Zhongshan Channel,modifications were made to the original design,which planned to use C50 steel fiber concrete with steel ingot milled-type fibers.Concrete mixes were tested with steel fibers from Shanghai Harrex,Tianjin Hengfeng,basalt fibers,and polyoxymethylene(POM)fibers.The properties such as slump,spread,cohesion,and water retention were analyzed,along with 28-day compressive strength,flexural strength,and cost-effectiveness for a comprehensive comparison to select the most suitable fiber type.Results indicate that POM fibers offer better dispersion than steel fibers,significantly enhancing cohesion,reducing bleeding and segregation,and ensuring concrete's compressive and flexural strength.
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