ABSTRACT

The present paper presents the rutting evaluation of different asphalt mixtures in use in the state of Rio Grande do Sul, Brazil’s southernmost-region, through the uniaxial repeated load test and the monitoring of mixtures performance in field, culminating in a criteria proposal for the parameter Flow Number depending on traffic. For this, five distinct asphalt binders were studied, five grain size distributions, three warm mixtures and 21 hot mixes, with different mineralogical types of aggregates, and 15 monitored test sites distributed geographically throughout the state. The results indicated that the binder modifications were the most influential characteristics in the asphalt mixtures rutting. Also, it was verified that the Flow Number criteria proposed so far in the country present significant differences. In this way, a new criterion was suggested, and it is possible to infer a good applicability for asphalt concretes, except for warm mixes and those with rubber binder.

摘要

本文介绍了巴西最南端的南里奥格兰德州使用的不同沥青混合物的车辙评估，通过单轴重复载荷试验和现场监测混合物性能，最终提出了参数的标准建议流数取决于流量。为此，研究了五种不同的沥青粘合剂、五种粒度分布、三种温拌混合物和 21 种热拌混合物，以及不同矿物学类型的骨料，以及分布在全州各地的 15 个受监控的测试地点。结果表明，粘合剂改性是沥青混合料车辙中影响最大的特征。此外，经证实，迄今为止在该国提出的流量数标准存在显着差异。这样，