Which test is used to evaluate the adhesion of asphalt to aggregates?

The test used to evaluate the adhesion of asphalt to aggregates is the Adhesion Test. This specific test measures how well the asphalt binder adheres to the aggregate surface, which is crucial for the performance of asphalt mixtures. Adequate adhesion ensures that the asphalt maintains its integrity and durability, which directly impacts the lifespan of the pavement.

In practice, this test can involve various methodologies, such as the boiling water test or other laboratory techniques that simulate conditions the asphalt will encounter in real-world applications. The outcome of the Adhesion Test helps in determining if the chosen aggregate and asphalt combination will perform effectively in terms of strength and resistance to moisture damage.

While the Marshall Stability Test is primarily focused on determining the stability and flow of asphalt mixes, and the Superpave Mix Design Test is geared toward optimizing the performance characteristics of the asphalt mixture, none of these directly assess the bond between asphalt and aggregates. The Pavement Quality Index Test evaluates overall quality and condition of pavement rather than specifically testing adhesion. Hence, the Adhesion Test is the most relevant to the question regarding the assessment of adhesion between asphalt and aggregates.