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- W612430211 abstract "Durch die verminderte Relaxationsfaehigkeit von Asphalt bei tiefen Temperaturen koennen infolge von Abkuehlprozessen kryogene Zugspannungen entstehen. Diese kryogenen Zugspannungen werden mithilfe des Abkuehlversuchs gemaess der Technischen Pruefvorschrift zum Verhalten von Asphalten bei tiefen Temperaturen versuchstechnisch ermittelt. Hierbei wird aus Zeitgruenden mit einer konstanten Abkuehlrate von 10 Kelvin pro Stunde (K/h) fuer Asphaltdeckschichtmaterialien gearbeitet. Die aus diesem Versuch resultierenden Ergebnisse sind jedoch tatsaechlich als zu hoch anzunehmen, da vor allem im negativen Temperaturbereich die maximal auftretenden Abkuehlraten zum Teil weitaus geringer sind. Durch die Auswertung deutschlandweiter und sehr umfangreicher Messwerte von Fahrbahnoberflaechentemperatur konnten temperaturabhaengige maximale Abkuehlraten ausgearbeitet werden. (A) ABSTRACT IN ENGLISH: Tensile stresses due to thermal constraction occur in asphalt layers because of the reduced ability to relaxation of asphalt at low temperatures. A special test method, as outlined in the TP Asphalt Behaviour of asphalt at low temperatures is currently used in Germany to investigate the low temperature properties of asphalt mixes. At the moment, the test operates with a fixed cooling-down rate of 10 K/h. However, this very high cooling-down rate does not reflect the actual cooling-down rates occurring in the field. In fact, the actual in situ coolingdown rates are varying and are much smaller than 10 K/h. Hence, a study was carried out in order to determine relevant cooling-down rates for asphalt pavements in Germany. A large number of pavement surface temperature data was analysed to define representative temperature dependant cooling-down rates. (A)" @default.
- W612430211 created "2016-06-24" @default.
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- W612430211 date "2008-01-01" @default.
- W612430211 modified "2023-09-23" @default.
- W612430211 title "Abkuehlraten von Asphaltdeckschichten auf der Basis von Fahrbahnoberflaechentemperaturmesswerten / Cooling-down rates for asphalt surface courses based on pavement surface temperature data" @default.
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