28 Bleeding can be caused by a number of factors, including: • Too much asphalt binder in the mix, or the wrong type of asphalt. • Poor construction practices, such as an improperly constructed seal coat or a prime coat that’s too heavy. • Hot weather or traffic compaction can cause the asphalt binder to fill voids in the pavement and expand onto the surface. Bleeding can be prevented by: • Ensuring the asphalt is not too porous. • Using a well-drained aggregate. • Incorporating adequate drainage into the pavement design. • Using polymer-modified or other binders to improve surface treatment performance. • Addressing best-practice factors like traffic loads and environmental conditions. Tips to respond to bleeding: • Minor bleeding may be correctable by using coarse sand to absorb excess binder. • Major bleeding may require removing excess binder by milling and replacing the surface of the asphalt pavement. BLEEDING Bleeding, also known as flushing, is a condition that occurs when asphalt in a pavement rises to the surface and forms a shiny, black film, which can create a smooth, slippery surface that can lead to hydroplaning.
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