The influence of milling asphalt rates from wearing surface to the flexural strength applied to a recycled layer with Portland cement

Abstract

The reclaimed asphalt pavement (RAP) on the added cement recycled base can influence on resulted material behavior; because as the RAP tax increases the recycled mixture stiffness and resistance reduces. The RAP acts as a black aggregate or as asphalt lumps on the resulted material depending on the main asphalt cement (AC) characteristics. This suggests that the AC rheological properties from the milling wearing surface can affect the behavior of the cement recycled base. According to a technical bibliography review this issue is rare and not so researched. It is not known until today the level of influence of the AC content and RAP tax on the cement recycled pavement on the structural performance. The authors developed a lab experience according two RAP samples, one with conventional AC and the other with rubber AC, to evaluate the flexural strength. In this case the mixture was stabilized with 3% in cement weight. To realize this study there were molded prismatic samples, 10×10cm×40cm dimensions, to be submitted to dynamic essays, of flexural strength. These prismatic samples, composed by 30%, 50% and 70% of RAP in weight in relation to the base material, behave as beams, under the specific essays. The particle size distribution of each studied RAP samples is offered in this work and also the AC tax and the physical properties, as the asphalt penetration test, melting point and elastic recovering. The resulted data can bring new alternatives to the building process in regions with tropical soils.