EVALUATION THE PERFORMANCE OF TREATED BASE LAYER ON CRITICAL RESPONSES OF FLEXIBLE PAVEMENT

الملخص

Often rehabilitation of flexible pavement expensive process, especially if the pavement problems in the substrata, whether in the base layer or natural ground layer simple surface layer does not lead to a long-term solution, and are being considered in many of the secondary materials for use as alternatives to the natural aggregate in paving roads as solutions engineering and economical way. The study includes laboratory experiments and analysis using a finite element analysis model of the finite elements of the two-dimensional layer based on the improved pavement under the dynamic loading effect. The calculated damage such as fatigue, rutting, and surface deformation of base materials and treated base materials using finite elements PLAXIS program (PLAXI V8.6) has been used different ratios of Reclaimed Concrete Aggregate and Foundry Sand, has the study using treated base materials with (50,15)% of Reclaimed Concrete Aggregate and Foundry Sand, respectively. It was suggested that an alternative method in this study, for the characteristics of the materials used for the flexible pavement required for finite element analysis by examining the compressive strength Using equations available in the literature available. It has been found that the improved base layer with Foundry Sand and Reclaimed Concrete Aggregate leads to a decrease in the estimated fatigue 90% and 14%, respectively. The rutting reduced Foundry Sand and Reclaimed Concrete Aggregate by about 93% and 52%, respectively.