What is the use of blown asphalt?

Blown asphalt is primarily utilized as a joint filler and for waterproofing applications. The process of blowing asphalt involves introducing air or oxygen under controlled conditions, which alters its properties. This modification enhances the material's durability, flexibility, and adhesive qualities, making it highly effective for sealing joints and creating impermeable barriers against water ingress.

In construction, this is particularly valuable when applied between building segments or to protect structures from moisture-related damage. The enhanced adhesive properties allow blown asphalt to meld effectively with various surfaces, ensuring a tight seal that prevents water penetration.

The other uses listed, such as a fuel source, coating for roads, or insulation material, do not leverage the unique properties of blown asphalt as effectively. While asphalt is generally used in road coatings, blown asphalt specifically excels in joint sealing and waterproofing rather than merely serving as a surface layer on roads.