Asphalt

The majority of roads, pavements, and landing-strips are made out of asphaltThe majority of roads, pavements, and landing-strips are made out of asphalt

Asphalt

Asphalt is a popular road construction material today because of its cost and performance advantages. Natural asphalt was discovered in 1595, but it was not bound with coal tar and used to pave roadways until 1902.

Asphalt courses

  1. Surface Course
  2. Binder Course
  3. Asphalt Base Course
  4. Road Base Course
  5. Sub-base
  6. Subgrade

Bitumen, the solid or semi-solid residue of the refinery process to make gasoline from petroleum, quickly replaced natural asphalt in paving. Recently, different synthetic polymers have improved performance and durability. Superpave (an acronym for Superior Performing Asphalt Pavements) is the latest technique for making superior asphalt to withstand adverse load and weather conditions.

Did you know?

At a speed of 40 km/h, the rolling noise of vehicles exceeds the noise coming from the engine. For this reason, German engineers developed noise-reducing asphalt, which is compact but has an air breathing capacity to absorb the major part of the noise caused by friction.

Vibratory plate compactor

The 10-12-ton road roller utilizes its own weight to compact the asphalt

Spreading grit on hot tar

The road inspector on a working platform