HowPavementWorks瀝青路面工作原理

1、HOW HOT MIX ASPHALT WORKS熱拌瀝青工作原理Hot Mix Asphalt熱拌瀝青How Asphalt Binder Behaves瀝青結(jié)合料性能4Behavior Depends on 性能主要取決于： Temperature 溫度 Time of Loading 荷載作用時(shí)間Effect of Temperature溫度影響How hard is the water?水的硬度是多少？ASPHALT BINDER瀝青結(jié)合料Solid Behavior 固態(tài)性能固態(tài)性能Liquid Behavior 液態(tài)性能液態(tài)性能Stiffness 硬度硬度 EFFECT OF TE

2、MPERATURE 溫度影響Solid Behavior固態(tài)性能HighTemperature 高溫LowTemperature 低溫LiquidBehavior 液態(tài)性能Which is Better? 哪一個(gè)更好呢？哪一個(gè)更好呢？Asphalts A and B are the same penetration 瀝青瀝青A和和B的針入度是一樣的的針入度是一樣的Asphalt A瀝青瀝青AAsphalt B瀝青瀝青B 黏度黏度Viscosity-20 77 140 2752-7SUPERPAVE Asphalt Binder Specification SUPERPAVE 瀝青結(jié)合料技術(shù)指標(biāo)

3、Grading System Based on Climate (Pavement Temperatures) PG等級(jí)取決于氣候（路面溫度） (Summer夏季) (Winter冬季) - 202060135Asphalt Binder Tests瀝青結(jié)合料測(cè)試Done at different temperatures在不同溫度進(jìn)行測(cè)試Test TemperatureChanges in Incrementsof 6C 測(cè)試溫度按照每測(cè)試溫度按照每6攝氏度遞增攝氏度遞增Dynamic Shear 動(dòng)態(tài)剪切動(dòng)態(tài)剪切, TP5G*/sin d d, Min 1.00 kPa 64 70Test

4、 Temp 測(cè)試溫度測(cè)試溫度 10 rad/secHow the Spec Works技術(shù)指標(biāo)如何工作？RequirementStays Same 要求保持一致要求保持一致Temperature Grades 溫度等級(jí)4High Temperature 高溫 58 64 70 764Low Temperature 低溫 -22 -28 -34Rule of 9090度原則lModified Asphalt Binder改性瀝青結(jié)合料Low temperature from base asphalt 低溫性能來(lái)源于基質(zhì)瀝青High temperature changed with modifie

5、r 高溫性能來(lái)源于改性劑Rolling Thin Film Oven Test (Short Term Aging)旋轉(zhuǎn)薄膜烘箱測(cè)試 （短期老化）2-12模擬施工老化過(guò)程High Temperature Test (Rutting)高溫測(cè)試 （車轍）4Done at High Temperature Grade4在高溫條件下進(jìn)行2-15Pressure Aging Vessel 壓力老化容器(Long Term Aging長(zhǎng)期老化測(cè)試)2-14模擬使用老化過(guò)程Low Temperature Test (Cracking) 低溫測(cè)試 （開(kāi)裂）4Done 10C Warmer thanLow Te

6、mperature Grade2-15Traffic Speed Effect車速影響4Depends on speed of traffic車速影響 High speed (100 k/h)高速 PG 64-22 Slower speed (50 k/h)低速 PG 70-22 Stopped speed 停止（交通燈）(traffic lights) PG 76-22Rut Resistance 抗車轍Rut Resistance抗車轍4Effected by 取決于： AggregateProperties 骨料性質(zhì) Volumetric Properties 體積性質(zhì) Air Void

7、s 孔隙STIFFNESS AND THE INDIANAPOLIS MOTOR SPEEDWAY印第安納賽車場(chǎng)硬度A BUSY INTERSECTION 繁忙路口PAVED WITH REGULAR MIX, AGE 2 YEAR 普通路面，通車兩年REPAIR PATCH 維修處 AGE 2 YEAR 兩歲Too soft 太軟Stiff enough 足夠硬度Rutting In Asphalt Layer瀝青層面車轍HMA15 cmAggregateBase骨料基30 cmSubgrade路基Mixture Stiffness 混合料硬度PAVED WITH REPLACEMENT M

8、IX, 混合料修補(bǔ)AGE 3 YEAR 通車三年After 9 years 9年以后FATIGUE CRACKING疲勞開(kāi)裂4Effected by 取決于 Asphalt content (mixture properties)瀝青混合料性質(zhì) Thickness厚度Fatigue Cracking 疲勞開(kāi)裂DURABILTIY耐久性4Effected by取決于： Asphalt content瀝青含量 Compaction (in-place voids)壓實(shí)（到位空隙）Raveling 剝離(segregation)Raveling 剝離(segregation)Low Temperat

9、ure Cracking 低溫開(kāi)裂Top Down Cracking 向下開(kāi)裂Top Down Cracking 向下開(kāi)裂Raveling and Cracking 剝離和開(kāi)裂Base Failure 基層破壞HMA Performance PropertiesHMA 性質(zhì)4Mix Properties 混合料性質(zhì) Asphalt Content 瀝青含量 Air Voids 孔隙 VMA 礦料間隙度4Density 密度4Segregation 剝離Rehabilitation and Construction 恢復(fù)和建設(shè)4Mill Surface 銑刨面層 To remove undesi

10、rable material 移除不良材料 To re-establish grades 重新建立等級(jí)Milling Machine 銑刨機(jī)Sweep to Remove Loose Debris清掃疏松碎片Milled Surface Ready for Tack Coat銑刨后的表面供粘接層使用Poor Milling PatternGeneral Severe Rutting嚴(yán)重的車轍Localized Severe Rutting 當(dāng)?shù)貒?yán)重車轍4Mill old surface 銑刨舊路面4Need 4 to 6 inches of good mix 需要4-6英尺的新路面Localized Severe Rutting當(dāng)?shù)貒?yán)重車轍4Subgrade problem -Dig out and patch路基問(wèn)題-深挖修補(bǔ)Concrete Pavement 水泥路面Reflective Cracking反射裂縫Rehabilitation修復(fù)4Durab