Avaliação de rodovias goianas restauradas com a técnica de reciclagem a frio in situ
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Data
2014-08-27
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Universidade Federal de Goiás
Resumo
Studies developed by the state road agency (AGETOP) in 2010, regarding the road infrastructure in the state of Goiás, indicated a need for rebuild 60% of the road network to reestablish its service level. To this end, in 2011, was create the program of road restoration "Rodovida", which aims to restore road infrastructure in the state along four years. In order to obtain parameters for evaluation of performed services, was signed an agreement between the government inspection agency (GO-CGE) and the federal university (UFG). This investigation was developed with the goal to made structural and functional analysis of restored pavements using full depth reclamation technique with gravel addition, to evaluate if the solutions defined in the projects enable the restored pavements meet, or not, the technical parameters of the current road standards, and therefore provide parameters for the incorporation of these reconstruction techniques in future projects. For this study were select three roads with pavements reconstruction in progress, in which procedures for recycling and compacting base monitored by sand bottle test, Speedy Moisture Test and the Dynamic Cone Penetrometer (DCP). Also deformed samples of recycled material for laboratory testing were collect, aiming to propose a model that relates California Bearing Ratio (CBR) with the Penetration Index (DN) for bases added crushed gravel, obtained from the analysis with the DCP in compacted specimens. For structural analysis, were performed field DCP tests to determine the resistance to dynamic penetration and stratigraphic evaluation. As well as testing with Benkelman beam for determining deflections. With the stratigraphy data collected from DCP and displacement basins with the Benkelman beam were determined resilience modulus through back analysis with the aid of the KENLAYER iterative tool. The results obtained with DCP showed thickness variation in the recycled layers, showing the need for greater control during restoration process. Respect to the penetration index determined for the tested bases, these values had increased variability that may be associated with loss control in the executive process, now for sub-base and subgrade layers were determined heterogeneous values, concluding that although high strength present in the recycled bases, this resistance, as well as the thickness of the bases, is heterogeneous. In terms of deflection, the three studied roads showed values within a satisfactory variation range, although some parts were identify with large values of deflection. In terms of back calculated modules, the obtained results can be considered heterogeneous, which may be associated to the recycling technique used or the fact that were adopt different restoration solutions along the evaluated section on a highway. As such, is concluded that even being adopted similar recycling solutions in the three studied roads, the analysis shows distinct behaviors connected mainly to executive processes used.
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GARCÍA HÓMEZ, J. H. Avaliação de rodovias goianas restauradas com a técnica de reciclagem a frio in situ. 2014. 173 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2014.