Mechanistic modelling of potential interlayer slip at base sub-base level

• Autores: E. Horak, J.W. Maina, S.E. Emery, B. Walker
• Localización: Bearing capacity of roads, railways and airfields: proceedings of the 8th International Conference on the Bearing Capacity of Roads, Railways and Airfields, Champaign, Illinois, USA, June 29-July 2, 2009 / Erol Tutulumluer (dir.), Imad L. Al-Qadi (dir.), Vol. 1, 2009, ISBN 9780415804325, págs. 543-550
• Idioma: inglés
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• Resumen

  • A new airport pavement under construction in Africa is experiencing severe salt crystallization problems. The local material with high salt content was used up to sub base level. The sub base was thus covered with a prime and bitumen rubber vapour cut off layer. On top of this layer a dry bound macadam (DBM) layer was constructed The DBM was sealed off with a 50 mm asphalt surfacing and a bitumen rubber seal as final surface seal.

    The concern was that the horizontal forces, due to braking and turning of the design aircraft, would cause interlayer slip at such positions where the bitumen rubber vapor seals are placed in the pavement as well as on the top. A mechanistic analysis was done to evaluate this pavement slip potential. The concept of strain energy of distortion (SED) is used to analyze the pavement to quantify and benchmark the effect of the horizontal forces.