石粉作为碾压混凝土材料 的新组分 ,符合绿色混凝 土 的发展 思路 ,其 作用越来越 受到人们 的重视。本 文通过内掺法研究不同掺量的石灰石粉对碾压混凝土力学性能和耐久性能的影响。结果表明,适宜的石灰石粉掺 量对 改善碾压混凝土 的工作性 能作用 明显;石灰石粉 与水泥二次反应效果 良好 ,同时密度 比水泥低 ,对提高碾压 混 凝土的早期抗压 强度 、极限拉伸值 和降低静力抗压弹性模 量具有 明显优势 ;石灰 石粉 的加入对 碾压混凝 土抗渗 性 能无不利影响 ;过量的石灰石粉掺 量会 降低 混凝土的抗冻性能。 【关键词】 石灰石粉;碾压混凝土;工作性能;力学性能;耐久性能 中图分类号 :TV431 文献标志码 :A 文章编号 :1005-4774(2015)05-0030-04 Discussion on influence oflim estonepowder on m echanicsperform ance and durability performance ofroller compacted concrete ZHAO Zhe ,MA Zhiguang (1.Sho'iazhuangHutuoNewZoneInvestmentandDevelopmentCo.,Ltd.,Shifazhuang050800,China; 2.South—to—NorthWaterDiversionMid—lineProjectConstructionAdministrationHebeiDirectControl ConstructionDepartment,Sho'iazhuang050035,China) Abstract:Mountain flour, as a flew componentofRCC materials, is in line with the developmentconceptofgreen concrete.Itsroleismoreandmoreemphasized.Inthepaper,influenceoflimestonepowderindifferentmixingproportions On rollercompactedconcretemechanicsperformanceanddurabilityperform anceisstudiedthroughinternalmixingmethod. Theresultshowsthatsuitable limestone powderdosage hasobvious effects on improving working performance ofroller compacted concrete.Secondaryreactioneffectbetween limestonepowderand cementisexcellent. Meanwhile,thedensity islowerthancement,and ithasprominentadvantagesin improvingearlycompressivestrengthand ultimatetensilestrainof rollercompacted concrete value, and lowering static compressive elastic modulus. Limestone powder addition has no adverse influenceonanti—seepageperformanceofrollercompactedconcrete.Excessivelimestonepowderdosage canlower concreteantifreezeperformance. Key words:limestonepowder;rollercompacted concrete;workingperformance;mechanicsperformance;durabilityper— formanee
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