Experimental Study on Performance of Fiber Reinforced Concretefor Prefabricated Pipe Joints in Urban Underground Integrated Pipe Gallery
In order to improve the mechanical properties of prefabricated pipe joint concrete for urban underground comprehensive pipe galler-ies,this article starts with the fiber content and fiber length,and studies the influence of prefabricated pipe joint fibers on the crack area,flex-ural strength,compressive strength,and impermeability performance of concrete.The results showed that the fiber content increased from 0,6%,and 10%to 14%,and the crack area of concrete with the addition of 6mm fibers decreased by 31.8%,46.3%,and 62.7%,respec-tively.The 7-day flexural performance increased by 29.6%,14.3%,and 11.1%,respectively;The reduction in crack area of concrete with the addition of 10mm fibers was36.3%,52.7%,and59.9%,respectively.The7-day flexural performance increased by25.9%,18.5%,and 14.8%,respectively.The optimal fiber content was determined to be 10%.When the fiber length increases from 0 to 6 mm and then to 10 mm,the maximum permeability height of concrete decreases by 50.1%and 65.3%,respectively.
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