1 00:00:00,480 --> 00:00:03,780 - Airfield damage repair is super exciting 2 00:00:03,780 --> 00:00:06,010 and important to me because we're helping 3 00:00:06,010 --> 00:00:08,380 the war fighter repair a runway 4 00:00:08,380 --> 00:00:11,750 and getting back to traffic within hours, 5 00:00:11,750 --> 00:00:14,070 rather than weeks or months, 6 00:00:14,070 --> 00:00:15,733 even in remote areas. 7 00:00:17,600 --> 00:00:19,070 My name is Lulu Edwards, 8 00:00:19,070 --> 00:00:20,670 I am a research engineer 9 00:00:20,670 --> 00:00:23,453 in the Geotechnical Instructor's Laboratory. 10 00:00:24,300 --> 00:00:25,360 The name of our project 11 00:00:25,360 --> 00:00:29,330 is Structural Requirements for Large Crater Repairs. 12 00:00:29,330 --> 00:00:33,180 The steps involved in doing a rapid airfield repair 13 00:00:33,180 --> 00:00:37,880 are first we have to saw-cut the damaged area, 14 00:00:37,880 --> 00:00:40,310 and once the area is saw-cut, 15 00:00:40,310 --> 00:00:43,600 we remove the damaged debris, 16 00:00:43,600 --> 00:00:46,350 and the concrete that is on top. 17 00:00:46,350 --> 00:00:51,350 Once the debris is removed, we put a backfill in there. 18 00:00:51,650 --> 00:00:55,290 We've tested several backfills over time, 19 00:00:55,290 --> 00:00:58,390 we have several options to choose from. 20 00:00:58,390 --> 00:01:00,970 In this case, in our large crater repairs, 21 00:01:00,970 --> 00:01:05,820 we're testing global fill and crushed limestone. 22 00:01:05,820 --> 00:01:07,420 And then once we have a backfill, 23 00:01:07,420 --> 00:01:09,979 we put in a rapid-setting cap. 24 00:01:09,979 --> 00:01:11,830 This is a rapid-setting concrete, 25 00:01:11,830 --> 00:01:14,650 that once it's set, after two hours, 26 00:01:14,650 --> 00:01:17,913 we're able to put aircraft traffic on it. 27 00:01:19,200 --> 00:01:22,090 We know that a certain repair can sustain 28 00:01:22,090 --> 00:01:23,960 so many passes, because we've tested it 29 00:01:23,960 --> 00:01:25,910 with a simulated load cart. 30 00:01:25,910 --> 00:01:27,630 And what we do is we monitor it, 31 00:01:27,630 --> 00:01:32,630 we measure the behavior of the pavement over time. 32 00:01:34,750 --> 00:01:39,630 The ability to rapidly repair a runway 33 00:01:39,630 --> 00:01:42,390 within hours is amazing to me, 34 00:01:42,390 --> 00:01:44,420 and something that I didn't even know was possible 35 00:01:44,420 --> 00:01:46,253 until I started working on this.