Evaluation of the Relationship between Asphalt Binder Properties and Non-Load Related Cracking

• Autores: R. MICHAEL ANDERSON, GAYLE N. KING, DOUGLAS I. HANSON, PHILLIP B. BLANKENSHIP
• Localización: Asphalt paving technology, ISSN 0270-2932, Vol. 80, 2011, págs. 615-663
• Idioma: inglés
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• Resumen

  • Non-load related cracking of asphalt pavements is cracking that is associated with the development of thermal stresses�usually manifesting itself as transverse and block cracking. Transverse cracking is generally referred to as low temperature cracking since it is associated with cracking that develops as the asphalt pavement is subjected to low temperatures that approach the limiting stiffness of the asphalt binder. Block cracking, however, is usually associated with cracking that may happen as the asphalt pavement ages and loses durability.

    As part of a research project involving airfield asphalt pavements, a laboratory study was conducted to evaluate if there was any potential relationship between asphalt binder properties and non-load related cracking.

    The objective of the research was to identify one or more parameters that could be easily determined by testing that would allow an airport manager to monitor the loss of durability experienced with aging and to use the information to assess when the airfield asphalt pavement would need preventative maintenance to minimize the effects of non-load associated cracking.

    In the laboratory study, three asphalt binders were selected representing different expected aging characteristics. Testing was conducted on asphalt binders in their unaged condition, as well as on asphalt binders that had undergone long-term aging in the Pressure Aging Vessel (PAV) at 100C and 2.1 MPa pressure for 20, 40, and 80 hours. The purpose of the longer PAV aging times was not to correlate with any expected service life, but simply to create a more highly-aged sample.

    Past research indicated some relationship between ductility (conducted at an intermediate temperature) and the durability of an asphalt pavement. Using ductility as the hypothesized property related to flexibility, two parameters were identified that related well to ductility and the expected ____________________________________ 1Asphalt Institute, Lexington, KY 2GHK Inc., Houston, TX 3AMEC, Phoenix, AZ The oral presentation was made by Mr. Anderson.