隧道衬砌结构复合改性再生混凝土力学与耐久性能试验

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中图分类号：U454 文献标志码：A 文章编号：1005-8249（2025）04-0051-06

DOI：10.19860/j.cnki.issn1005-8249.2025.04.010

LAN Yang' ，XIE Kaizhong²，PAN Feng

（1. Guangxi Road and Bridge Engineering Group Co.， Ltd.， Nanning 53OOOO， China; 2. School of Civil Engineering and Architecture， Guangxi University，Nanning 530o04， China; 3.Guangxi Changxing Engineering Construction Co.， Ltd.， Nanning 53OoOO， China）

Abstract：To enhance theoverallperformanceofrecycledconcreteused intunnel linings，anorthogonalexperimentalmethod was employed under a 30% recycled coarse aggregate replacement rate to systematically investigate the effects of fly ash content ， basalt fibercontentandlength，andwater-binderratioonthemechanicalanddurabilitypropertiesof theconcrete.Theresults indicate that the optimal overall performance was achieved with a mix of 25% fly ash， 0.20% basalt fiber，12 mm fiber length， and a water-binder ratio of O.35，yielding the highest 28- day compressive and tensile strengths. The water-binder ratio was identified as the most influential factor.Under coupled freeze-thawand sulfate attack conditions，the mix with 15% fly ash， （20 0.10% basalt fiber，6mm fiberlength，anda water-binder ratioof O.35exhibitedsuperior strength retention．The study demonstratesthatthesynergisticincorporationofflyashandbasaltfiberscansignificantlyimprovethemechanicalanddurability

propertiesofrecycledconcrete，providingtechnicalsupportforitsapplicationintunnelstructures exposedtocoldandaggresive environments.

Key words：recycledconcrete；flyash；basalt fiber；mechanical properties；freeze-thawand sulfatecoupling；durability

0 引言

随着交通基础设施的快速发展，隧道工程在铁路、公路和城市轨道交通中的应用日益广泛，结构安全与耐久性能成为设计与运维阶段的重点关注方向[1]。（剩余6966字）