MaterialsforRoadsandBridgeDecksprof.dr.ir.Andre MolenaarAugust31,2025TUDelftDelftUniversityofTechnology
Vermelding onderdeel organisatie August 31, 2025 1 Materials for Roads and Bridge Decks prof. dr. ir. André Molenaar
WhoamI?AndréMolenaar（安德烈-米勒Andelie-milei)Professor(em)attheDelftUniversityofTechnologyProfShaopengWuandmehadacooperationsince 2005IknowProfRongLuosince20088students fromprof Wu'sgroupgraduatedinDelftDrLiantong Mo,DrGangLiu,DrDongxing Xuan,DrJianQiu,DrYueXiao,Dr Ning Li,Dr Yuan Zhang,Dr Jingang WangAugust31,2025NTUDelft
Who am I? • André Molenaar (安德烈 - 米勒 Ān dé liè - mǐ lēi) • Professor (em) at the Delft University of Technology • Prof Shaopeng Wu and me had a cooperation since 2005 • I know Prof Rong Luo since 2008 • 8 students from prof Wu’s group graduated in Delft Dr Liantong Mo, Dr Gang Liu, Dr Dongxing Xuan, Dr Jian Qiu, Dr Yue Xiao, Dr Ning Li, Dr Yuan Zhang, Dr Jingang Wang August 31, 2025 2
AretieOceanGreanfeni(Des)RRCANADARUSSIANLANDSFEDERATIONCHINANOUDceanPATAERITAEAMAIeanBRAZILHAI1CDOMREPTIPUERTO RICOAUSTRALIATHEWORLDPoliticalbrepolsHubei province 4 * bigger and has 4* more inhabitants than my country
Hubei province ≈ 4 * bigger and has 4* more inhabitants than my country August 31, 2025 3
IntroductionA goodinfrastructure(roads,bridges,airfieldsharbors)isimportantforsocialandeconomicdevelopmentofa countryApoorinfrastructure meanspovertyBusiness will only do well wheninfrastructure(roads,railways,harbors,airports)isgoodAugust31,2025?TUDelft
Introduction • A good infrastructure (roads, bridges, airfields, harbors) is important for social and economic development of a country • A poor infrastructure means poverty • Business will only do well when infrastructure (roads, railways, harbors, airports) is good August 31, 2025 4
IntroductionBridgesarethe mostcriticalstructuresinaroad networkYoucan still drive over a failed roadYoucannotdrive overafailed bridge.Conseguencesof afailed bridge are much higher than those of a failed roadBridgesaredesigned withhigh safetyfactorsRoadsaredesignedwithmuchlowersafetyfactorsRoadsandbridgesarecompletelydifferentstructuresandthereforeneedcompletelydifferent materials?TUDelft
Introduction • Bridges are the most critical structures in a road network • You can still drive over a failed road • You cannot drive over a failed bridge. Consequences of a failed bridge are much higher than those of a failed road • Bridges are designed with high safety factors • Roads are designed with much lower safety factors • Roads and bridges are completely different structures and therefore need completely different materials August 31, 2025 5
BridgesBridges are keyfeatures ininfrastructure"No bridge-no traffic"Ofthe 10longestsuspensionbridgesintheworld,5are in ChinaAugust31,2025TTUDelft
Bridges • Bridges are key features in infrastructure • “No bridge – no traffic” • Of the 10 longest suspension bridges in the world, 5 are in China August 31, 2025 6
Xihoumen Bridge 2nd longestmain span 1650 m,4 lanesAugust31,2025TUDelft
Xihoumen Bridge 2nd longest main span 1650 m, 4 lanes August 31, 2025 7
PavementstructureinChinaSHOULDERSLOWLANE3.75mFASTLANE3.75m9.49.29.08.88.68.48.28.07.87.67.47.27.06.86.66.46.26.05.85.65.45.25.04.84.64.44.24.03.83.63.43.23.02.82.622.01.81.61.41.21.00.80.60.40.20.0Distancefromcentre(medianDeptrDepth20 cm20cm30cm+100100August31,2025TUDelft
August 31, 2025 8 Pavement structure in China 9.4 9.2 9.0 8.8 8.6 8.4 8.2 8.0 7.8 7.6 7.4 7.2 7.0 6.8 6.6 6.4 6.2 6.0 5.8 5.6 5.4 5.2 5.0 4.8 4.6 4.4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 5 5 10 10 15 15 20 20 25 25 30 30 35 35 40 40 45 45 50 50 55 55 60 60 65 65 70 70 +100 +100 Depth Depth SHOULDER SLOW LANE 3.75 m FAST LANE 3.75 m Distance from centre (median) 20 cm 20 cm 30 cm
Typical bridgedeckstructurewearingcourse50- 70 mmadhesion layerisolation layerbonding layersteel plate 10-12 mmAugust31,20252TUDelft
Typical bridge deck structure August 31, 2025 9 steel plate wearing course adhesion layer bonding layer isolation layer 10 – 12 mm 50 – 70 mm
Road vsBridge StructuresRoadBridgeStructureis fullysupportedStructure is NOT fully supportedAsphalt layer distributes the load toAsphalt layer protects the bridgelower layers and helps carrying thestructuretrafficloadTensilestrainin boundlayerssuchTensile strain in asphalt layer can bevery highasasphalt arefairly lowDead weight is not really importantDead weight is very importantDead weight, traffic, temperature,Traffic,temperature,moisturemoisture,windSoil very important = foundation forSoil very important = foundation forbridgepavement10TUDelft
Road vs Bridge Structures Road Bridge Structure is fully supported Asphalt layer distributes the load to lower layers and helps carrying the traffic load Tensile strain in bound layers such as asphalt are fairly low Dead weight is not really important Traffic, temperature, moisture Soil very important = foundation for pavement Structure is NOT fully supported Asphalt layer protects the bridge structure Tensile strain in asphalt layer can be very high Dead weight is very important Dead weight, traffic, temperature, moisture, wind Soil very important = foundation for bridge 10