HowPavementWorks瀝青路面工作原理

HOWHOTMIXASPHALTWORKS

熱拌瀝青工作原理HotMix

Asphalt

熱拌瀝青HowAsphaltBinderBehaves

瀝青結(jié)合料性能BehaviorDependson性能主要取決于：Temperature溫度TimeofLoading荷載作用時(shí)間EffectofTemperature

溫度影響Howhardisthewater?

水的硬度是多少？ASPHALTBINDER

瀝青結(jié)合料SolidBehavior固態(tài)性能LiquidBehavior液態(tài)性能Stiffness硬度EFFECTOFTEMPERATURE溫度影響SolidBehavior固態(tài)性能HighTemperature高溫LowTemperature

低溫Liquid

Behavior液態(tài)性能Whichis

Better????哪一個(gè)更好呢？AsphaltsAandBarethesamepenetration瀝青A和B的針入度是一樣的AsphaltA瀝青AAsphaltB瀝青B

黏度Viscosity-20771402752-7SUPERPAVEAsphaltBinderSpecification

SUPERPAVE瀝青結(jié)合料技術(shù)指標(biāo)GradingSystemBasedonClimate(PavementTemperatures)PG等級(jí)取決于氣候（路面溫度）

(Summer夏季)(Winter冬季)PG64-22PerformanceGradePG等級(jí)Average7-daymaxpavementdesigntemp(oC)平均7天最高設(shè)計(jì)路面溫度Minpavementdesigntemp

(oC)最低設(shè)計(jì)路面溫度Temperature,C-20 20 60 135AsphaltBinderTests

瀝青結(jié)合料測(cè)試Doneatdifferenttemperatures在不同溫度進(jìn)行測(cè)試TestTemperatureChangesinIncrements

of6C測(cè)試溫度按照每6攝氏度遞增DynamicShear動(dòng)態(tài)剪切,TP5G*/sind,Min1.00kPa 64 70TestTemp測(cè)試溫度@10rad/secHowtheSpecWorks

技術(shù)指標(biāo)如何工作？RequirementStaysSame要求保持一致TemperatureGrades

溫度等級(jí)HighTemperature高溫58647076LowTemperature低溫-22-28-34Ruleof9090度原則ModifiedAsphaltBinder改性瀝青結(jié)合料Lowtemperaturefrombaseasphalt低溫性能來源于基質(zhì)瀝青Hightemperaturechangedwithmodifier高溫性能來源于改性劑RollingThinFilmOvenTest

(ShortTermAging)

旋轉(zhuǎn)薄膜烘箱測(cè)試（短期老化）163CSimulatesConstructionAging2-12模擬施工老化過程HighTemperatureTest(Rutting)

高溫測(cè)試（車轍）Doneat

HighTemperature

Grade在高溫條件下進(jìn)行FixedPlate固定盤Binder結(jié)合料2-15PressureAgingVessel壓力老化容器

(LongTermAging長(zhǎng)期老化測(cè)試)SimulatesIn-ServiceAging2-14模擬使用老化過程LowTemperatureTest(Cracking)低溫測(cè)試（開裂）Done10oCWarmerthan

LowTemperature

Grade2-15TrafficSpeedEffect車速影響Dependson

speedoftraffic車速影響

Highspeed(100k/h)高速PG64-22Slowerspeed(50k/h)低速PG70-22Stoppedspeed停止（交通燈）

(trafficlights)PG76-22RutResistance抗車轍RutResistance抗車轍Effectedby取決于：Aggregate

Properties骨料性質(zhì)Volumetric

Properties體積性質(zhì)AirVoids孔隙STIFFNESSANDTHEINDIANAPOLISMOTORSPEEDWAY印第安納賽車場(chǎng)硬度ABUSYINTERSECTION繁忙路口PAVEDWITHREGULARMIX,AGE2YEAR普通路面，通車兩年REPAIRPATCH維修處AGE2YEAR兩歲Toosoft太軟Stiffenough足夠硬度RuttingInAsphaltLayer

瀝青層面車轍HMA

15cmAggregate

Base骨料基

30cmSubgrade路基MixtureStiffness混合料硬度PAVEDWITHREPLACEMENTMIX,混合料修補(bǔ)AGE3YEAR通車三年After9years9年以后FATIGUECRACKING疲勞開裂Effectedby取決于Asphaltcontent(mixtureproperties)瀝青混合料性質(zhì)Thickness厚度FatigueCracking疲勞開裂DURABILTIY耐久性Effectedby取決于：Asphaltcontent瀝青含量Compaction(in-place

voids)壓實(shí)（到位空隙）Raveling剝離(segregation)Raveling剝離

(segregation)LowTemperatureCracking低溫開裂TopDownCracking向下開裂TopDownCracking向下開裂RavelingandCracking

剝離和開裂BaseFailure基層破壞HMAPerformanceProperties

HMA性質(zhì)MixProperties混合料性質(zhì)AsphaltContent瀝青含量AirVoids孔隙VMA礦料間隙度Density密度Segregation剝離RehabilitationandConstruction恢復(fù)和建設(shè)MillSurface銑刨面層Toremoveundesirablematerial移除不良材料Tore-establishgrades重新建立等級(jí)MillingMachine銑刨機(jī)Sweepto

RemoveLoose

Debris

清掃疏松碎片MilledSurfaceReadyforTackCoat

銑刨后的表面供粘接層使用PoorMillingPatternGeneralSevereRutting

嚴(yán)重的車轍LocalizedSevereRutting當(dāng)?shù)貒?yán)重車轍Milloldsurface銑刨舊路面Need4to6inchesofgoodmix需要4-6英尺的新路面LocalizedSevereRutting

當(dāng)?shù)貒?yán)重車轍Subgradeproblem-Digoutandpatch路基問題-深挖修補(bǔ)ConcretePavement水泥路面ReflectiveCracking反射裂縫Rehabilitat