摘要
为提升城市地下综合管廊预制管接缝混凝土的力学性能,文中从纤维掺量和纤维长度入手,研究了预制管接缝纤维对混凝土裂缝面积、抗折强度、抗压强度及抗渗性能的影响.结果表明,纤维掺量从0、6%、10%增加至 14%,掺加 6mm纤维的混凝土裂缝面积降幅分别为31.8%、46.3%、62.7%,7 d抗折性能增幅分别为29.6%、14.3%、11.1%;掺加10 mm纤维的混凝土裂缝面积降幅分别为36.3%、52.7%、59.9%,7 d抗折性能增幅分别为25.9%、18.5%、14.8%,确定最佳纤维掺量为10%.当纤维长度从0 增加至6mm时,再增至10 mm时,混凝土的最大渗透高度降幅分别为50.1%、65.3%.
Abstract
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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