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.
Tuesday, 18 October 2011
Testing Different Coils
Last week we spend together with our partner SGS-Intron a day at the producer of the induction machine that we are using to heat and heal the asphalt. We once again found out that the mechanism of induction heating is influenced by many factors. To find the right combination of fibres in the material (length, cross section, amount, distribution) and settings of the machine (frequency, power, coil design etc) needs some insight knowledge, but also some trial and error.
We can not say that we had nothing to choose from..............