POM纤维体积掺量对含粗骨料UHPC性能的影响及机理分析.pdfVIP

2025年第3期混凝土与水泥制品2025No.3

3月CHINACONCRETEANDCEMENTPRODUCTSMarch

POM纤维体积掺量对含粗骨料UHPC性能的

影响及机理分析

胡宇锋1,吴方红2.*,庄兆铨²,孙永佳2

（1.中铁十一局集团第四工程有限公司，湖北武汉430061;2.佛山大学土木与交通学院，广东

佛山528225）

摘要：研究了共聚甲醛(POM)纤维的体积掺量(0~2.00%)对含粗骨料超高性能混凝土(CA-UHPC)的流动性、

表观密度和力学性能的影响，并进行了微观分析。结果表明：掺POM纤维CA-UHPC的表观密度为2300~2420kg/m；

随着POM纤维体积掺量的增加,CA-UHPC的流动性降低，抗压强度增大，劈裂抗拉强度和抗折强度基本呈先增大

后减小再增大的趋势;POM纤维与UHPC基体间的界面过渡区致密，基体开裂区域的POM纤维呈拔出和拉断两种

破坏形式。

关键词：含粗骨料超高性能混凝土（CA-UHPC)；共聚甲醛纤维；流动性；力学性能；微观机理

中图分类号：TU528.572文献标识码：Adoi:10.19761/j.1000-4637.2025.03.054.05

InfluenceandmechanismanalysisofvolumecontentofPOMfiberonperformanceof

UHPCwithcoarseaggregates

HUYufeng,WUFanghong,ZHUANGZhaoquan,SUNYongjia?

(1.ChinaRailway11thBureauGroupFourthEngineeringCo.,Ltd.,Wuhan430061,China;2.SchoolofCivilEngineeringand

Transportation,FoshanUniversity,Foshan528225,China)

Abstract:Theinfluenceofthevolumecontentofcopolymerformaldehyde(POM)fiber(0-2.00%)ontheflowability,

apparentdensityandmechanicalpropertiesofultra-highperformanceconcretewithcoarseaggregates(CA-UHPC)was

studied,andmicroscopicanalysiswasconducted.TheresultsshowthattheapparentdensityofPOMfiberreinforcedCA-

UHPCis2300~2420kg/m.WiththeincreaseofthevolumecontentofPOMfiber,theflowabilityofCA-UHPCdecreases

whilethecompressivestrengthincreases,andthesplittingtensilestrengthandflexuralstrengthshowanon-lineartrend,

initiallyincreasing,thendecreasing,andsubsequentlyincreasingagain.TheinterfacetransitionzonebetweenPOMfibersand

UHPCmatrixisd