Self-healing asphalt

In this TEDxTalk Eric gives a demo of a new type of asphalt made with simple materials, that results in astonishing features.

The problem:
After some years, asphalt binder is degraded by environmental factors, especially due to UV-radiation from the sun, until it loses the ability to bind the surface particles together. This results in cracks which allow damaging moisture into the lower pavement levels, creating surface roughness, pot holes, degradation and eventual structural failure. At present, there are no solutions to close cracks in the pavement. Occasionally, when signs of ageing are visible, a sealant that protects asphalt surfaces from environmental degradation and moisture penetration is applied to the surface. These procedures can increase the lifetime of asphalt for several years before rehabilitation or reconstruction is required, but they have the disadvantage that they only work in the first centimeters from the surface and can reduce sliding resistance.

In many studies it has been demonstrated how it is possible to make asphalt or concrete conductive by adding electrically conductive fillers and fibers. Then, if this magnetically susceptible and electrically conductive material is heated with electromagnetism. Heat is generated through the energy lost and finally the material melts and the crack is closed.

Microwave technology makes this new asphalt economically viable because of the following reasons:
*The steel wool content is around ten times less than that recommended for heating by electro- magnetic induction, which in practice could mean an important reduction in costs.
*The amount of electricity used by microwave devices is much less than that required to produce a similar effect by electromagnetic induction.

You can find extra information in this paper:
Heating asphalt mixtures with microwaves to promote self-healing (


2 thoughts on “Self-healing asphalt

  1. Wonderful technology that can lower the cost for rehabilitation or reconstruction. But one of the disadvantages, causing the reduction of the slide resistance, to some extends, is disastrous, especially in snowy or rainy days. I believe with the development of this technology, this drawback can be eliminated._(:з」∠)_

  2. This material is very amazing. Compare with the material before, it doesn’t make the stone out and it will combine together. I mean self-healing. I am wandering is it rigid enough after heating up? Because it looks very soft after heating up.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s