Quantao obtained in the last weeks some new interesting data from the tests.
The tests that he performed are the 4-point bending fatigue tests on beams. See one of the posts below for the set-up. What comes out of the tests is that the optimum healing temperature is 85 C. The tests are done on 'fresh' samples and samples that are artificially aged to an age of about 5 years. The healing performance and fatigue life extension ratio of the fresh and aged samples is almost equal. In the aged samples we see a slight decrease of 2%.
In the graph below the fatigue life extension ratio is plotted for tests were we only had natural healing (just rest periods) and were we had our induction healing combined with rest periods.
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.