Análise da execução de um revestimento asfáltico utilizando diferentes medidas de qualidade

Abstract

Currently, the issue of quality control used in road works is gaining notoriety in Brazil. Some studies and projects have been developed in technical and scientific circles in the search for improving the quality of asphalt sidewalks. In this context, the present study evaluated the quality of the binder and overlay layers of an asphalt pavement applied on a federal highway under the perspective of the DNER-PRO 277/97 standard (quality measure PRO/277) which provides guidelines regarding the acceptance or rejection of road works and services in Brazil. The layers were also evaluated from the perspective of quality measures adopted in other countries, especially in the United States. These are the Percentage Within Limits (PDL) and the Mean Absolute Deviation (DAM). By means of these three measures, sample sets of the following properties were evaluated: percentages of the degree of compaction (Gc), binder content (%CAP) and voids volume (Vv), the thicknesses (Esp) of the binder and overlay layers, and the percentages of the asphalt mixture used in a 1.58 km long asphalt pavement section that passed through the 19mm, 12.50mm, 4.75mm and 0.075mm sieves. The impact of the quality measured by PDL and DAM on the Payment Factors (FP) of the contractor was also estimated. As results, the indications of PRO/277 and PDL are in favor of rejection of the binder and overlay layers, due to the low quality control quantified by both measures, especially related to the property thickness (Esp) of the two overlay layers, which presents high sample values in relation to the design specifications. On the other hand, measures PRO/277, PDL and DAM pointed to good execution quality for the properties %CAP and Vv, with a beneficial impact on the contractor's FP, as it resulted in the right to full payment and/or bonuses of up to 5%. In summary, it was concluded that variability, a preponderant factor in determining the execution quality of asphalt pavements, is well covered by measures PRO/277 and PDL, but on the contrary, it was not well shown through DAM, leading to divergences between the three measures, with significant emphasis on the application of PDL and DAM indications in the equations for determining their respective payment factors FPPDL and FPDAM.