超高性能混凝土早期收縮性能的研究

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中圖分類號：TU528.31 文獻標志碼：A 文章編號：1005-8249（2025）02-0011-07

DOI：10.19860/j.cnki.issn1005-8249.2025.02.003

Abstract：Theshrinkagesof UHPC specimenswith diferentconstituentindifferentcuringmethodsweremeasuredbycontact methodinordertosolvethecrackproblemofUHPCatearlystage.Theresultsshowthatthereisacritical water-binderratio for theearlyshrinkageofUHPC，whenthe water-binderratioislessthanthecritical water-binderratio，theshrinkageof UHPC increases withtheincreaseofwater-binderratio，anddecreaseswiththeincreaseofwater-binderratiowhenthewater-binder ratioisargerthanthecritical water-binderratio.TheefectofflyashandslagpowderonearlyshrinkageofUHPCissimilar. Theshrinkagedecreases withtheincreaseof thedosageofflyashandslag powder，theefectoflyashonearlyshrinkagecontrol isbetterthanthatof slagpowder.Theearlyshrinkageof UHPCincreaseswiththeaditionofsilicafume.Thereistheobvious ffectofsteelfiberonearlyshrinkagecontrolofUHPC.ThetotalshrinkageofUHPCin7disthehighestinhotwatercuring，the second instandardcuring，andthelowestinnaturalcuring.Theshrinkageofthefourcuring methodsisveryobvious inthefirst （20 3 d ，andtheshrinkagefrom3dto7dinhot watercuringisthesmalestinfourcuring methods.Therefore，the properhot water maintenance in the early stageof theactual projectis beneficial to the late development of shrinkage inhibition.

Key words： ultra-high performance concrete; constituent； curing method; early shrinkage

0 引言

自Larrard等1提出超高性能混凝土（UHPC）以來，其研究與應(yīng)用已成為土木工程領(lǐng)域關(guān)注的熱點。（剩余8732字）