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This research evaluated the soil-aggregate recycling with cement, soil-aggregatecement mixtures, as a cementitious subbase solution for pavement rehabilitation. The use of recycled aggregates as paving material is an increasing practice in Brazil and abroad, receiving public and social incentives, as well as representing major environmental benefits associated with the reuse and conservation of natural resources, and reduction of the materials transportation costs. Such aggregates have unique characteristics inherent to their origin and previous use; therefore it should be extensively evaluated whenever used in any pavement layer. The materials selected to this study were collected from the base course of Fernão Dias Highway. To these materials, Portland cement was added, in order to establish new materials to the recycled subbase. Since it presents a very significant structural function in the pavement layers system, the cement treated base requires a careful and comprehensive mechanical characterization. This research was divided in laboratory and field evaluation. Five recycled mixtures with cement were studied in laboratory, varying: the recycled aggregate material, the cement percentage added to the mixture, and the energy compaction. Different laboratory standard procedures, applied for concrete and granular material, were also studied. All the variables investigated influenced the mechanical behavior of the recycled cementitious mixtures. The field study consisted of the construction and structural monitoring of an experimental test site comprised of three segments (varying the thickness of the recycled subbase layer), and also laboratory mechanical tests of field cores. The results have shown the structural evaluation of the pavement along one year, and also stiffness parameters measured in situ from the field cores.

Avaliação laboratorial e de campo da tecnologia de reciclagem de base com cimento para a reabilitação de pavimentos.