Effect of Compaction Temperature on Rutting and Moisture Resistance of Foamed Warm-Mix-Asphalt Mixtures

A laboratory investigation was carried out to study the effects of various compaction temperatures on moisture susceptibility and rutting resistance of warm-mix-asphalt (WMA) mixtures containing moist aggregates using a foaming technology. The experimental design included two aggregate moisture contents (0 and ∼0.5% by weight of aggregate dry mass), one lime content (1% lime by weight of dry aggregate), two foaming water contents (2 and 3%) with control, and two aggregate sources. The major properties, such as the gyration number of various samples, indirect tensile strength (ITS), tensile strength ratio, rut depths of dry and conditioned specimens, and deformation (flow), were measured for all mixtures. The test results indicated that the aggregate source significantly affected the ITS and rutting resistance regardless of the foaming water content, compaction temperature, and aggregate moisture content. In addition, mixtures from moist aggregate had lower gyration numbers regardless of aggregate type, foaming technology, and compaction temperature. Moreover, the ITS values of foamed mixtures containing moist aggregate increased as the compaction temperature increased. Furthermore, the rut depths of all the dry and wet mixtures slightly increased as their compaction temperatures decreased regardless of the aggregate moisture content, foaming water contents, and aggregate type. A compaction temperature below 102°C (215°F) generally had no noticeable aging (2 h) effects on the mixture and did not significantly increase the rutting resistance of these WMA mixtures.

Language

  • English

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Filing Info

  • Accession Number: 01491903
  • Record Type: Publication
  • Files: TRIS, ASCE
  • Created Date: Aug 14 2013 4:12PM