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The wear behavior of tire tread rubber compounds is a fundamental factor in order to develop durable products, which can deal with the severity conditions of a multitude of markets. The rubber compounders must develop products in an interactive process, in which the ingredients and its levels are changed as a function of the market response The tire wear assessment is challenging because this behavior can be influenced by a multitude of factors, as the pavement, the vehicle, the driver and the weather conditions. Outdoor tests in vehicles provide a wear assessment but are expensive and need around 6 months to present results. Laboratory devices were developed to accelerate the data acquisition but frequently present a severity much higher than outdoor tests. A scientific and technological partnership between Escola Politécnica da USP and Pirelli Tires developed laboratory equipment that uses asphaltic counterfaces extracted from Brazilian roads, working under controlled conditions. The first part of this work presents that this testing machine can reproduce the tire wear mechanism (Schallamach waves), simulating the outdoor conditions and sorting the different rubber compounds in a way similar to the outdoor tests. The last part of this work presents a wear analysis of a rubber compound as a function of different pavements found in Brazilian roads. For a pavement with good integrity (absence of holes and irregularities) its microtexture will significantly influence the performance of vehicle tire tread rubber compounds.

Estudo do desempenho dos compostos de borracha utilizados na fabricação da banda de rodagem dos pneus automotivos em função dos pavimentos das rodovias.