公路施工新技术.ppt.ppt

公路施工新技术,2019年12月,施工过程,施工过程新技术,自检碾压机移动式拌和楼红外线摄影机混合料传送机,不均匀密度的影响,同压密不够类似增加剥落与水损减少疲劳寿命增加空隙率1%将至少减少10%的寿命,不均匀密度的位置,温差超过14C空隙率增加2%,材料传递机,材料传递机拌和叶片,摊铺之前的再拌和,施工工艺自动化,计算机技术应用卫星和激光定位技术遥控技术图控技术机器眼技术动态反馈和传感技术人机对话技术,卫星定位技术,激光定位技术,遥控技术,遥控挖掘装载机,碾压自动化,多台碾压机碾压自动化,机器眼探测裂缝,机器眼安装路面标记,自动封缝机,图控技术,人机对话,遥控管涵安装机,遥控挖掘装载机,桥梁除漆机器人,自动扫雪洒盐机,路面新技术,超级性能路面玛蹄脂沥青碎石混凝土路面永久路面,混合料主要特点,严格的材料选择,旋转压密机和体积比设计,沥青性能分级,以天气为基础,PG64-22,PerformanceGrade,Average7-daymaxpavementdesigntemp,Minpavementdesigntemp,Thelowerthenumber,themoreresistanttothermalcracking.,PG-22-28-34,集料特性,基本特性要求coarseaggregateangularity(CAA)fineaggregateangularity(FAA)flat,elongatedparticles(F&E)claycontent(SE)来源特性选择toughnesssoundnessdeleteriousmaterialspolishvalues,100,0,.075.32.364.759.512.519.0,PercentPassing,SieveSize(mm)Raisedto0.45Power,级配,控制点,100,0,.075.32.364.759.512.519.0,PercentPassing,controlpoint,restrictedzone,maxdensityline,maxsize,nommaxsize,SieveSize(mm)Raisedto0.45Power,MarshallMethod,19.0mm,25.0mm,37.5mm,9.5mm,4.75mm,12.5mm,AGGREGATEGRADATIONNominalSize:19.0mmSMA&19.0mmSuperpave,PercentPassing,SMA,Superpave,19.0mmSuperpave,InsertI-70,I-70Ndesign-9619.0mmSMAVTM-4.3,AGGREGATEGRADATIONNominalSize:12.5mmSMA&12.5mmSuperpave,SMA,Superpave,I-8312.5mmPG70-22Binder,First12.5mmSMA,I-68,热压密和紧跟摊铺机!,特性比较,RutResistantDurableSkidResistantReducedSprayReducedHydroplaningReducedSound,SuperpaveSMA,DecisionPointsforusingSMAastheSurfaceLayer,2000ESALsperday55mph,永久路面路面设计概念,永久路面路面设计概念,抗疲劳沥青基层：通过厚度使拉应变最小,永久路面路面设计概念,抗车辙上面层,集料颗粒摩擦互锁：轧制和粗颗粒沥青胶结料：高温性能和改性空隙率：现场4%-6%,永久路面路面设计概念,抗车辙上面层车辙试验验证现场加速试验,上开裂,华盛顿州永久路面,州际高速公路90号47%没有破坏27-33年；路面24公分；第一次罩面12年；第二次罩面13年。,厚度比较,性能试验,车辙仪,车辙仪试验结果,路面噪音,FHWA-NoiseAbatementCriteria67dB(A)“thisisnotanabsolutevalueordesignstandard,onlyalevelwherenoisemitigationmustbeconsidered”,TheDecibelScale,HearingThreshold,Conversation,PainThreshold,Discomfort,TheDecibelScale,Increasingthedecibellevelby10doublesthenoiseintensity!,Conversation,Train,ChainSaw,隔音墙,Effectiveonlyforthoseinline-of-sight.,Donotreducenoiseatsource.,Effectivenessmustjustifyexpense.Cases:I-40,Knoxville:$25,000/homeI-285,Atlanta:Requirementsof69dB(A)and67dB(A),5dB(A)Nationwide(FHWA,2019):$1M/mile,隔音墙,Conclusions,“Ingeneral,whendense-gradedasphaltandPCCpavementsarecompared,thedense-gradedisquieterby2to3dB(A)”,路面微观构造,67dB(A),15m,TheDecibelScale,Areductionof3dB(A)islikedoublingthedistancefromthenoise.,67dB(A),30m,-3dB(A)=64dB(A),Conclusions:“Ingeneral,whendense-gradedasphaltandPCCpavementsarecompared,thedense-gradedisquieterby2to3dB(A)”,A3dB(A)reductioncorrespondsto:-doublingthedistance-reducingtrafficvolumeby50%-reducingtrafficspeedby25%,Conclusions:“Open-gradedasphaltshowsthegreatestpotentialfornoisereductionforpassbynoise.Reductionwhencomparedtodense-gradedasphaltrangedfrom1to9dB(A).”,A9dB(A)reductioncorrespondsto:-areductionintrafficnoisebyalmost50%!,OGFCsReduceNoiseandImproveVisibility,NoiseReductionOpenvsDenseGradedMixes,Source:NCHRP284,DOTsindicateastrongneedforpavementnoisecontrolstrategies.Properselectionofpavementsurfaceisthebestmethodtoreducenoisefrompavement/tireinteractions.,WhatCanBeDone?,OGFCisthequietestsurfacetype.(Wayson,NCHRPSynthesis268)SMAhasalsoproventobeaquietsurface.(WisconsinDOT,1993)DensegradedHMAsurfacesarequieterthanPCCpavements.(HibbsandLarson,ReportFHWA-SA-96-068,May2019),EffectofPavementSurface,NoiseMakesNews!,FamiliesNearI-275islobbyingtheMichiganDOTforsoundabatement.In2019,MDOTrebuiltI-275withconcrete.Residentscontendtheprojecthasincreasenoiselevels.Levelshavebeenregisteredupwardsof90decibels.StevePhillipsofBerkshire,England-basedTRLLimitedspokeaboutEnglands10-yearplantoinstallquietersurfaceson60%ofmaintrunkroads.ThesurfaceswillbeSMAorOGFC.,Summary,Highwaynoiseisimportanttothepublic.SmallchangesindBlevelarenoticeable.Decreaseof9dB(A)reducesnoiseby50%Decreaseof3dB(A)islikedoublingdistance,Summary,Noisewallscanwork,but:Theyareexpensive.Theydontworkinal