简介:Theobjectiveofthisresearchwastoshowawaytoconductrejuvenationofagedpolymermodifiedasphaltbinder(PMB)successfully.TofullyevaluateandunderstandtherejuvenationofagedPMB,thePenetrationgradetestsincludingpenetration,softenpoint,ductilityandelasticrecoveryandSuperpaveTMPGgradetestsincludingDSR,BBRandDDTwereconducted.TherejuvenationeffectofagedPMBbyutilizingafluidrecyclingagentincommonuseforbinderrejuvenationwasevaluated.AndthenthecompoundrejuvenationeffectofagedPMBbyutilizingtherecyclingagentwithanewmodifyingadditiveforbindermodificationwasevaluated.Theexperimentalresultsindicatedthattherecyclingagentincommonusecurrentlydoesnotapplytopolymermodifiedasphaltbinderrejuvenation.Buttherecyclingagenttogetherwiththemodifyingadditivecanrestorethecharacteristicsofagedpolymermodifiedbinderverywell.Therefore,compoundrejuvenationofpolymermodifiedasphaltbinderisrecommended.
简介:Thecoarseporesystem,interfacialtransitionzone(ITZ)betweenaggregateandpastematrixandvolumefractionofunhydratedcementinconcrete(w/c=0.3)containingmineraladmixtureswerequantitativelycharacterizedbythescanningelectronmicroscope-backscatteredelectron(SEM-BSE)imageanalysistechnique.Theexperimentalresultsshowthatcompoundadditionofslagandflyashdecreasesthecoarseporosityfrom10.17%to3.74%andthethresholddiameterofcoarseporesizefrom345μmto105μmcomparedwithconcrete(w/c=0.30)withoutmineraladmixtures;Moreoverwithcompoundadditionofflyashandslag,thevolumeproportionofunhydratedcementinpastematrixisreducedby30%,themaximumamountofcoarseporesintheITZbetweenaggregateandpastedecreasesfrom13.11%to5.57%andthethicknessofITZisreducedby37%,comparedwithconcretewithoutmineraladmixtures.
简介:力量的发展和用在在低温度的硫酸盐环境下面的低水文件夹比率的石灰石粉末做的基于水泥的材料的攻击的形式被学习。结果显示当水文件夹比率比0.40低时,有石灰石粉末的基于水泥的材料在为120d在低温度在10%镁硫酸盐答案被浸泡,并且在在200d岁时被浸泡以后在外观有重要变化以后在外观有不足道的变化。扩大损坏和脱落在不同层次发生在具体测试立方体的表面上。当石灰石粉末占大约28%似水泥的材料时,与水文件夹比率的减少,在材料在200d岁时在低温度在镁硫酸盐答案被浸泡以后,压缩力量损失逐渐地减少了。在有不到0.4的水文件夹比率和石灰石粉末卷的标本以后大与20%在200d岁时在低温度在10%镁硫酸盐答案被浸泡比,带攻击的破坏被引起到具体测试立方体的石膏,没有thaumasite硫酸盐攻击。