Comportamento mecânico de misturas asfálticas produzidas com ligante modificado por lignina extraída de pinus.

Abstract

In most countries, the main technique for coating flexible floors is the asphalt coating. The introduction of modifiers in asphalt binders and in asphalt mixtures has the purpose of avoiding the emergence of the defects themselves, allowing to improve the quality of the asphalt binder and, therefore, to provide the pavement with a longer life in service. Thus, this study aimed to evaluate the mechanical properties of asphalt mixtures produced with modified binder by addition of 3% and 6% lignin contents from pine. For this study, the CAP 50/70 was used as modifier and the lignin extracted from the pinus. Tests were carried out to determine the mechanical properties of the mixtures, among them: indirect traction, Modified Lottman and resilience modulus. The addition of lignin promoted an increase in stiffness, viscosity and machining and compaction temperatures. It was possible to observe an increase in tear strength, a reduction of adhesiveness after cycles of humidity.