The image below shows an asphalt core (left) and the same core heated under the induction machine (right). The right photo is taken with our infrared camera. It can be clearly seen that the induction heating primarily heats up the bitumen (with the steel wool fibers) and not the aggregates. In the infrared image the aggregates are darker, which means the temperature is lower.
Self Healing Aspalt on the A58
On this Blog we will give info on the test track with Self Healing Asphalt that is built on the A58 near Vlissingen in The Netherlands. The Asphalt is a special type of ZOAB (very porous aphalt concrete) containing small steelwool fibres. A known but serious problem with ZOAB is ravelling: stones at the surface coming off in time due to microcracking in the binder. The special ZOAB that is developed at Delft University (sponsored by AgentschapNL) can be heated with induction energy due to the fibres that are present which closes the microcracks and with that extends the service life of the road.