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Cerâmica

versão impressa ISSN 0366-6913

Resumo

NUNES, F. R. G.; SILVA, C. L. da  e  FROTA, C. A. da. Fatigue damage induced and healing identification in particulate ceramic composites for application in flexible pavings. Cerâmica [online]. 2009, vol.55, n.336, pp.425-436. ISSN 0366-6913.  http://dx.doi.org/10.1590/S0366-69132009000400014.

One of the major distresses in flexible pavings, throughout its useful life, is the fatigue cracking. This problem, in general, initiates in the base of the asphalt layer and propagates for its surface. The characterization of the asphalt mixtures, carried out in Brazil, is based on the number of cycles that cause the rupture in the fatigue test. However, such number is not a mechanical parameter, varying for different boundary conditions. The objective of the present article is to identify mechanical parameters, referring fatigue cracking, of the asphalt composite with synthetic calcinated clay aggregates (SCCA). To this end, a continuum damage viscoelastic model was used based works from Shapery, Kim and Lee. The results with the composite studied (SCCA) had shown: that the loss of rigidity, based on an internal state variable, can be a fatigue criterion; that the test can be carried through for one stress level; the healing of micro cracks during the rest periods in the structure.

Palavras-chave : fatigue; synthetic aggregates; micro cracks.

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