辅助胶凝材料与砂胶比对沙漠砂超高性能混凝土性能的影响

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中图分类号：TU528 文献标志码：A

Abstract：ToreducetheproductioncostofUltra-high-performanceconcrete（UHPC）andreduceenvironmentalpolution，thisstudy investigatedthefectsofuxiliarycementiousmaterialdosageandsand-tobinderratioontheperformanceoffulldesertsandUHPC. Theoptimumcontentoflyashandilicafumeandtheoptimumsand-to-binderratioweredetermiedbythresinglefactortests，and thenthe microstructure wasanalyzedbyscanning electron microscopyandthermogravimetricanalysis.Theresultsshowthat withthe increaseofflyashcontent，thefluidityofdesertsandUHPCgraduallincreases.Withtheincreaseofsand-to-binderratiothefuidity decreases.When the silica fume content accounts for 10% ofthe cementitiousmaterial，thefluidityreachesthe peak.Inaddition， when the content of fly ash accounts for 20% of the total amount of cementitious materials，the compressive strength and flexural strengthreachthepeakvaluesof112.4 MPaand 24.0MPa ，respectively.When the content of silica fume accountsfor 30% ofthe totalamount ofcementitiousmaterialsand the sand-binderratio is 0，90 ，themaximum compressive strength can reach 1O8.O MPa. Microstructural analysisrevealed that with 20% fly ash and 30% SFdosages relative to the total cementitious materials，combined with asand-binderratioofO.9O，theinterfacialransitionzonebondingperformanceandmatrixcompactnesswereotimied，andtheC-- Hgelcontentataineditshighestlevel.Thesefidingsprovideastrongreferenceforthepreparationandapplicationoflow-cost， environmentally friendly UHPC.

超高性能混凝土（Ultra-High-PerformanceConcrete，UHPC）以其卓越的力学性能和耐久性[-2]，在满足相同性能需求的情况下能够显著减少混凝土用量，从而减轻结构自重，而被广泛应用于高层建筑、桥梁工程和国防工程中。（剩余14283字）