Self-healing asphalt | Erik Schlangen | TEDxDelft
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0:27 - 0:33(Crackling)
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0:48 - 0:49(Thud)
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0:54 - 0:58(Laughter)
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1:16 - 1:21(Microwave beeping)
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1:29 - 1:33You probably all agree with me
that this is a very nice road. -
1:33 - 1:35It's made of asphalt.
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1:35 - 1:39Asphalt is a very nice material
to drive on. -
1:39 - 1:43But, not always,
especially not on days as today, -
1:43 - 1:45when it's raining a lot.
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1:45 - 1:48Then you have a lot of splashing
water on the asphalt, -
1:48 - 1:51and especially if you ride
your bicycle and cars pass you, -
1:51 - 1:55then that's not very nice.
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1:55 - 1:58Also, asphalt can create
a lot of noise. -
1:58 - 2:00It's a noisy material,
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2:00 - 2:03and if we build roads,
like in the Netherlands, -
2:03 - 2:06very close to cities,
then we would like a quiet road. -
2:06 - 2:09We have solutions for that.
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2:09 - 2:14The solution for that is
to make roads out of porous asphalt. -
2:14 - 2:17Porous asphalt material
that we use now -
2:17 - 2:20in most of the highways
in the Netherlands, -
2:20 - 2:23it has pores, and water
can just rain through it, -
2:23 - 2:25like you see in this image.
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2:25 - 2:28So all the rain water
will flow away to the side, -
2:28 - 2:31and you have a road easy to drive on,
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2:31 - 2:33so no splashing water anymore.
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2:33 - 2:36Also the noise will disappear
into these pores, -
2:36 - 2:39because it's very hollow,
all the noise will disappear, -
2:39 - 2:42so it's a very silent road.
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2:42 - 2:45It also has disadvantages, of course.
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2:45 - 2:50A disadvantage of this road
is that reveling can occur. -
2:50 - 2:52What is reveling?
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2:52 - 2:56You see that in this road
the stones at the surface come off. -
2:56 - 3:00So what actually happens,
first you get one stone, -
3:00 - 3:02then several more,
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3:02 - 3:04and more, and more, and more,
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3:04 - 3:06and then they --
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3:06 - 3:07I will not do that.
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3:07 - 3:08(Laughter)
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3:08 - 3:11But they can damage your windshield,
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3:11 - 3:13so you're not happy with that.
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3:14 - 3:17Finally, this reveling can also lead
to more and more damage -
3:17 - 3:19like you see in the next image,
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3:19 - 3:22sometimes you can create
potholes with that. -
3:22 - 3:23(Microwave beeping)
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3:23 - 3:25Hah, it's ready.
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3:27 - 3:30Potholes, of course,
can become a problem. -
3:30 - 3:32But we have a solution.
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3:32 - 3:35Here you can see how the damage
appears in this material. -
3:35 - 3:37It's a porous asphalt, like I said,
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3:37 - 3:40there is only a small amount
of binder between the stones, -
3:40 - 3:43and this binder,
due to weathering, due to UV light, -
3:43 - 3:47due to oxidation,
this binder, this bitumen, -
3:47 - 3:49the glue between the aggregates
is going to shrink. -
3:49 - 3:51And if it shrinks, it gets microcracks,
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3:51 - 3:53and it delaminates from the aggregates,
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3:53 - 3:55and then if you drive over the road
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3:55 - 3:58you kick out the aggregates,
which we just saw here. -
3:59 - 4:03To solve this problem,
we thought of self-healing materials. -
4:03 - 4:06If you can make these materials
self-healing, -
4:06 - 4:09then probably, we have a solution.
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4:09 - 4:12So what we do is use steel wool,
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4:12 - 4:14used to clean pans,
like you see in the picture, -
4:14 - 4:18and the steel wool we can cut
into very small pieces, -
4:18 - 4:22and these very small pieces,
we can mix into the bitumen. -
4:22 - 4:26Then you have asphalt with
very small pieces of steel wool in it. -
4:27 - 4:30Then you need a machine,
like you see here, -
4:30 - 4:33that is used for cooking,
an induction machine. -
4:33 - 4:37Induction can heat especially steel,
it's very good at that. -
4:37 - 4:40And then what you do is you melt --
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4:40 - 4:43you heat up the steel,
you melt the bitumen, -
4:43 - 4:45and the bitumen will flow
into these microcracks, -
4:45 - 4:49and the stones are again
fixed to the surface. -
4:49 - 4:51Today I used a microwave,
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4:51 - 4:55because I cannot bring the big
induction machine to heat on the stage, -
4:55 - 4:58so I microwaved, it's a similar system.
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4:58 - 5:01So I put the specimen in,
which I'm going to take out -
5:01 - 5:03to see what happened.
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5:03 - 5:06I need my gloves again.
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5:22 - 5:25This is the specimen coming out now.
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5:25 - 5:30We have such an industrial
machine in the lab, -
5:30 - 5:32to heat up the specimens.
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5:32 - 5:34We tested a lot of specimens there,
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5:34 - 5:37and then the government,
they actually saw our results, -
5:37 - 5:39and they thought,
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5:39 - 5:41Well, that's very interesting.
We have to try that. -
5:41 - 5:44So they donated to us
a piece of highway, -
5:44 - 5:47400 meters of the A58,
close to Vilssingen, -
5:47 - 5:50where we had to make
a test track to test this material. -
5:50 - 5:55So that's what we did here, you see
where we're making the test road, -
5:55 - 6:00and then, of course,
this road will last several years, -
6:00 - 6:04without any damage,
that's what we know from practice. -
6:04 - 6:07So we took a lot of samples
from this road, -
6:07 - 6:09and we tested them in the lab.
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6:09 - 6:12So we did aging on the samples,
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6:12 - 6:14did a lot of loading on it,
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6:14 - 6:17healed them with our induction machine,
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6:19 - 6:21healed them, tested them again.
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6:21 - 6:25Again broke them, healed them,
several times we can repeat that. -
6:25 - 6:29So actually the conclusion
from this research is that -
6:29 - 6:34if you go on the road every
4-years with our heating machine-- -
6:34 - 6:37this is the big version we have made
to go on the real road -- -
6:37 - 6:40if you go on the road every 4-years
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6:40 - 6:42we can double the service life
of this road, -
6:42 - 6:46which, of course,
saves a lot of money. -
6:46 - 6:52To conclude, I can say
that we made a material -
6:52 - 6:56using steel fibers,
additional steel fibers, -
6:56 - 6:58and using induction energy,
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6:58 - 7:02to really increase
the service life of the road, -
7:02 - 7:05even double the service life,
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7:05 - 7:08really save a lot of money
with very simple tricks. -
7:08 - 7:11And now you're of course
curious if it also worked. -
7:11 - 7:14So I still have the specimen
here, it's quite warm. -
7:14 - 7:16Actually it has to cool down first,
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7:16 - 7:19before I can show you
that the healing works, -
7:19 - 7:21but I will do a trial.
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7:21 - 7:23Let's see --
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7:23 - 7:24Yeah, it worked!
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7:24 - 7:26Thank you.
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7:26 - 7:31(Applause)
- Title:
- Self-healing asphalt | Erik Schlangen | TEDxDelft
- Description:
-
Erik Schlangen presents his invention of self-healing asphalt using steel-wool fibers and induction energy.
- Video Language:
- English
- Team:
- closed TED
- Project:
- TEDxTalks
- Duration:
- 07:38
TED Translators admin edited English subtitles for Self-healing asphalt | Erik Schlangen | TEDxDelft | ||
Tulio Leao approved English subtitles for Self-healing asphalt | Erik Schlangen | TEDxDelft | ||
Tulio Leao edited English subtitles for Self-healing asphalt | Erik Schlangen | TEDxDelft | ||
Tulio Leao edited English subtitles for Self-healing asphalt | Erik Schlangen | TEDxDelft | ||
Tulio Leao edited English subtitles for Self-healing asphalt | Erik Schlangen | TEDxDelft | ||
Tulio Leao commented on English subtitles for Self-healing asphalt | Erik Schlangen | TEDxDelft | ||
Ariana Bleau Lugo accepted English subtitles for Self-healing asphalt | Erik Schlangen | TEDxDelft | ||
Ariana Bleau Lugo edited English subtitles for Self-healing asphalt | Erik Schlangen | TEDxDelft |
Tulio Leao
Perfect sync/transcription and adaptation of sentences to be more readable.