Engineer invents self-healing asphalt

The video explains how cracks in asphalt roads form due to continuous traffic, leading to potholes. It introduces self-healing asphalt, which combines porous asphalt with steel wool fibers. When heated, the steel wool causes the bitumen to melt and fill the cracks, extending the road's lifespan without frequent repaving.

What is a common consequence of cracks forming in asphalt due to vehicle traffic?

• The asphalt becomes smoother.

• Potholes may form.

• The road becomes quieter.

• The road becomes more colorful.

What materials are combined to create self-healing asphalt?

• Concrete and rubber fibers

• Concrete and steel wool fibers

• Porous asphalt and steel wool fibers

• Porous asphalt and rubber fibers

How does self-healing asphalt repair cracks when heat is applied?

• The steel wool fibers harden and seal the cracks.

• The asphalt contracts and closes the cracks.

• The asphalt expands and covers the cracks.

• The steel wool fibers melt and fill the cracks.

What role do steel wool fibers play in self-healing asphalt?

• They provide color to the asphalt.

• They strengthen the asphalt.

• They help melt the bitumen to fill cracks.

• They make the asphalt more porous.

What is a significant benefit of using self-healing asphalt on roads?

• It reduces the need for frequent repaving.

• It makes roads more expensive to maintain.

• It increases the noise level of traffic.

• It makes roads more slippery.