1 00:00:17,246 --> 00:00:19,595 ^- [Vincent] The US Army Engineer Research and Development 2 00:00:19,595 --> 00:00:22,713 ^Center's Geotechnical and Structures laboratory 3 00:00:22,713 --> 00:00:25,965 ^will evaluate different materials for camouflet repairs 4 00:00:25,965 --> 00:00:28,033 ^at the silver flag exercise site 5 00:00:28,033 --> 00:00:30,341 on Kendall Airforce Base, Florida. 6 00:00:30,341 --> 00:00:32,944 ^- A camouflet is similar to a crater, 7 00:00:32,944 --> 00:00:35,357 ^except the munition actually penetrates the pavement 8 00:00:35,357 --> 00:00:37,168 ^and detonates underneath it. 9 00:00:37,168 --> 00:00:39,217 ^So it leaves a void underneath the pavement 10 00:00:39,217 --> 00:00:41,398 ^and the pavement surface is fairly intact. 11 00:00:41,398 --> 00:00:43,378 It's more difficult to detect the damage 12 00:00:43,378 --> 00:00:45,648 but it also has the potential to cave in 13 00:00:45,648 --> 00:00:47,152 under the weight of an aircraft 14 00:00:47,152 --> 00:00:48,588 and that could cause damage to the aircraft 15 00:00:48,588 --> 00:00:50,429 as well as injury to people. 16 00:00:50,429 --> 00:00:51,568 - [Vincent] In these situations, 17 00:00:51,568 --> 00:00:53,190 typical crater repair procedures, 18 00:00:53,190 --> 00:00:55,562 such as sawcutting and debris removal, 19 00:00:55,562 --> 00:00:57,230 are likely unnecessary. 20 00:00:57,230 --> 00:00:59,073 Instead, the engineers will determine 21 00:00:59,073 --> 00:01:00,872 the suitability of different materials 22 00:01:00,872 --> 00:01:04,010 that best stabilizes camouflet sub-surface voids. 23 00:01:04,010 --> 00:01:06,148 - [Cox] And some of those things that we're looking at 24 00:01:06,148 --> 00:01:10,315 range from expanding foams that we can pour into the hole, 25 00:01:10,358 --> 00:01:12,880 into the cavity, that expands and fills it up, 26 00:01:12,880 --> 00:01:16,016 to rapid setting flowable fill, which is a concrete-type 27 00:01:16,016 --> 00:01:17,673 product that we can pour in 28 00:01:17,673 --> 00:01:19,173 and it kind of fills up the cavity. 29 00:01:19,173 --> 00:01:21,378 After repairs, the concrete slabs are measured 30 00:01:21,378 --> 00:01:25,172 by topographical survey to establish baseline elevation, 31 00:01:25,172 --> 00:01:26,589 then it's tested. 32 00:01:26,685 --> 00:01:28,787 - [Cox] We'll use the C17 load cart 33 00:01:28,787 --> 00:01:30,620 to simulate aircraft traffic 34 00:01:30,620 --> 00:01:34,432 and we'll apply numerous passes to the repair of damage 35 00:01:34,432 --> 00:01:38,400 and we'll take readings at different pass intervals 36 00:01:38,400 --> 00:01:41,695 just to see how the traffic is affecting the repair 37 00:01:41,695 --> 00:01:42,848 and if it's able to hold up. 38 00:01:42,848 --> 00:01:44,164 - [Vincent] The engineer's readings 39 00:01:44,164 --> 00:01:46,226 comes from simple tests such as... 40 00:01:46,226 --> 00:01:48,098 - [Cox] Going out and counting the cracks 41 00:01:48,098 --> 00:01:50,258 and seeing how the crack develops in the concrete. 42 00:01:50,258 --> 00:01:51,950 - [Vincent] To more complex tests 43 00:01:51,950 --> 00:01:53,887 with their falling weight deflectometer. 44 00:01:53,887 --> 00:01:55,710 - Which is a very sophisticated machine 45 00:01:55,710 --> 00:01:57,032 that drops a weight on the pavement 46 00:01:57,032 --> 00:01:59,302 but takes very minute deflection measurements 47 00:01:59,302 --> 00:02:01,716 and so we can see how the stiffness of the pavement 48 00:02:01,716 --> 00:02:04,344 changes over time, before the repair, after the repair, 49 00:02:04,344 --> 00:02:07,332 and as the repair might degrade under traffic. 50 00:02:07,332 --> 00:02:10,714 The idea is that we could repair the damage 51 00:02:10,714 --> 00:02:13,183 without ever having to tear out the pavement. 52 00:02:13,183 --> 00:02:15,358 That saves time as well as cost. 53 00:02:15,358 --> 00:02:18,225 The ultimate goal is that we can demonstrate 54 00:02:18,225 --> 00:02:20,345 that the repair can sustain traffic 55 00:02:20,345 --> 00:02:22,966 and also sustain further operations 56 00:02:22,966 --> 00:02:25,441 in the event of a real attack and a real repair. 57 00:02:25,441 --> 00:02:28,206 - [Vincent] Resuming aircraft launch and recovery operations 58 00:02:28,206 --> 00:02:30,749 is usually a first-order concern, 59 00:02:30,749 --> 00:02:32,795 so it's critical that repairs are completed 60 00:02:32,795 --> 00:02:34,439 in an expedient manner. 61 00:02:34,439 --> 00:02:38,606 With the Army Corps of Engineers, I'm Vincent Mouzon.