Matches in SemOpenAlex for { <https://semopenalex.org/work/W614042146> ?p ?o ?g. }
Showing items 1 to 85 of
85
with 100 items per page.
- W614042146 abstract "During the past twenty years the use of hot mix asphalt (HMA) as a sub-ballast layer within the track structure has steadily increased until it is becoming standard practice in many areas of the United States. Previous investigations involving core drilling, sampling, and characterization of trackbed materials were conducted on twelve in-service HMA trackbeds. These were widely scattered over six different states and averaged thirteen years of service. The strength and bearing capacity values of the protected roadbed materials remain near optimum, thus assuring adequate support for the track. The HMA layer - protected from temperature extremes, sunlight, and oxidation - maintains mechanical properties essentially unaffected after many years of exposure and loading. More recent studies involve instrumenting several HMA trackbeds with earth pressure cells and displacement transducers to measure trackbed pressures and deflections and to calculate track stiffness (modulus). These tests, conducted in the real time domain train operations, confirm the positive attributes of the HMA layer. Results are presented for several test installations on CSX Transportation heavy tonnage mainlines and for the Transportation Technology Center (Pueblo) low track modulus heavy tonnage test track. For the 105 metric ton loaded hopper cars, track deflections are typically 6 mm for wood tie track and 1.5 mm for concrete tie track. These equate to dynamic track modulus values of 20 MPa and 50 MPa respectively. Vertical pressures at the ballast/HMA interface are a function of imposed loadings and range up to 120 kPa for 33 metric ton axle loads. Pressures are further reduced to about 35 to 50 kPa under the HMA layer at the subgrade interface. It is shown that the low trackbed stress level is due in part to the high sheer stress development in the ballast since the HMA layer provides optimum restraint and support for the ballast. The low stress level assures a long fatigue life for the asphalt layer. For the covering abstract see ITRD E122683." @default.
- W614042146 created "2016-06-24" @default.
- W614042146 creator A5002012111 @default.
- W614042146 creator A5019595634 @default.
- W614042146 creator A5034427156 @default.
- W614042146 date "2002-01-01" @default.
- W614042146 modified "2023-09-24" @default.
- W614042146 title "HEAVY-HAUL ASPHALT (HMA) UNDERLAYMENT TRACKBEDS: PRESSURES/DEFLECTIONS/MATERIALS PROPERTIES MEASUREMENTS" @default.
- W614042146 hasPublicationYear "2002" @default.
- W614042146 type Work @default.
- W614042146 sameAs 614042146 @default.
- W614042146 citedByCount "2" @default.
- W614042146 crossrefType "journal-article" @default.
- W614042146 hasAuthorship W614042146A5002012111 @default.
- W614042146 hasAuthorship W614042146A5019595634 @default.
- W614042146 hasAuthorship W614042146A5034427156 @default.
- W614042146 hasConcept C111368507 @default.
- W614042146 hasConcept C119599485 @default.
- W614042146 hasConcept C125907379 @default.
- W614042146 hasConcept C127313418 @default.
- W614042146 hasConcept C127413603 @default.
- W614042146 hasConcept C129727815 @default.
- W614042146 hasConcept C159985019 @default.
- W614042146 hasConcept C168056786 @default.
- W614042146 hasConcept C182377489 @default.
- W614042146 hasConcept C187320778 @default.
- W614042146 hasConcept C192562407 @default.
- W614042146 hasConcept C2777946747 @default.
- W614042146 hasConcept C2778713851 @default.
- W614042146 hasConcept C2779372316 @default.
- W614042146 hasConcept C2779666059 @default.
- W614042146 hasConcept C36656581 @default.
- W614042146 hasConcept C39432304 @default.
- W614042146 hasConcept C523993062 @default.
- W614042146 hasConcept C66938386 @default.
- W614042146 hasConcept C78519656 @default.
- W614042146 hasConcept C89992363 @default.
- W614042146 hasConceptScore W614042146C111368507 @default.
- W614042146 hasConceptScore W614042146C119599485 @default.
- W614042146 hasConceptScore W614042146C125907379 @default.
- W614042146 hasConceptScore W614042146C127313418 @default.
- W614042146 hasConceptScore W614042146C127413603 @default.
- W614042146 hasConceptScore W614042146C129727815 @default.
- W614042146 hasConceptScore W614042146C159985019 @default.
- W614042146 hasConceptScore W614042146C168056786 @default.
- W614042146 hasConceptScore W614042146C182377489 @default.
- W614042146 hasConceptScore W614042146C187320778 @default.
- W614042146 hasConceptScore W614042146C192562407 @default.
- W614042146 hasConceptScore W614042146C2777946747 @default.
- W614042146 hasConceptScore W614042146C2778713851 @default.
- W614042146 hasConceptScore W614042146C2779372316 @default.
- W614042146 hasConceptScore W614042146C2779666059 @default.
- W614042146 hasConceptScore W614042146C36656581 @default.
- W614042146 hasConceptScore W614042146C39432304 @default.
- W614042146 hasConceptScore W614042146C523993062 @default.
- W614042146 hasConceptScore W614042146C66938386 @default.
- W614042146 hasConceptScore W614042146C78519656 @default.
- W614042146 hasConceptScore W614042146C89992363 @default.
- W614042146 hasLocation W6140421461 @default.
- W614042146 hasOpenAccess W614042146 @default.
- W614042146 hasPrimaryLocation W6140421461 @default.
- W614042146 hasRelatedWork W138415400 @default.
- W614042146 hasRelatedWork W1984459244 @default.
- W614042146 hasRelatedWork W2085636494 @default.
- W614042146 hasRelatedWork W2155236577 @default.
- W614042146 hasRelatedWork W2172637557 @default.
- W614042146 hasRelatedWork W2240348569 @default.
- W614042146 hasRelatedWork W2246721097 @default.
- W614042146 hasRelatedWork W2519082845 @default.
- W614042146 hasRelatedWork W573447687 @default.
- W614042146 hasRelatedWork W580889664 @default.
- W614042146 hasRelatedWork W584213798 @default.
- W614042146 hasRelatedWork W592076717 @default.
- W614042146 hasRelatedWork W609892402 @default.
- W614042146 hasRelatedWork W622928154 @default.
- W614042146 hasRelatedWork W624543783 @default.
- W614042146 hasRelatedWork W632520850 @default.
- W614042146 hasRelatedWork W639154320 @default.
- W614042146 hasRelatedWork W640703775 @default.
- W614042146 hasRelatedWork W658562469 @default.
- W614042146 hasRelatedWork W85330978 @default.
- W614042146 isParatext "false" @default.
- W614042146 isRetracted "false" @default.
- W614042146 magId "614042146" @default.
- W614042146 workType "article" @default.