The 'Technisch Weekblad' published an article (in Dutch) on the self healing asphalt. Click on the image to read the article.
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.
Sunday, 30 January 2011
Wednesday, 26 January 2011
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.
Monday, 24 January 2011
Today the road was inspected and 120 cores have been drilled from the road. The road survived the cold days with ice and snow perfectly. No damage or even small cracks could be observed.
The cores will be tested in our lab. We will perform mechanical tests to measure the indirect tensile strength. The cores will be scanned in our CT-scanners to measure the fibre distribution. Part of the cores will be aged in the weather-o-meter and we will apply induction heating to the samples to test how fast heating is possible.
The results of the tests will be put on this blog when available,
Thursday, 20 January 2011
Tuesday, 4 January 2011
oC under the induction machine in the laboratory. The image is taken with our infrared camera.
here. The brochure is both in Dutch and in English. Happy reading.