Asphalt

Asphalt is a type of artificial block made from sand, gravel, and bitumen in a chemical plant, similar to concrete. It gives an incredible speed boost when walked on.

Usage
Having a blast resistance of 100, makes it a useful building material.

Though not as strong nor as useful as concrete, it is still a hard and durable material. Ideas can include blast-resistant walkways/roads, or a protective covering over the ground for Watz Power Plants due to its resistance to the degrading effects of poisonous mud, sky bridges for boss fights.

(terraria moment)