1 00:00:00,328 --> 00:00:01,161 (light music) 2 00:00:01,161 --> 00:00:03,492 (logo swooshes) 3 00:00:03,492 --> 00:00:05,992 (light music) 4 00:00:09,450 --> 00:00:12,570 - [Narrator] Full depth reclamation, or FDR, 5 00:00:12,570 --> 00:00:16,560 reuses asphalt bound and unbound granular materials, 6 00:00:16,560 --> 00:00:19,020 offering the Texas Department of Transportation 7 00:00:19,020 --> 00:00:22,323 a cost-effective way to recycle previously used pavement. 8 00:00:23,250 --> 00:00:25,230 Studies over the past few years 9 00:00:25,230 --> 00:00:26,790 have shown a need for revision 10 00:00:26,790 --> 00:00:29,850 of currently used mixture specifications. 11 00:00:29,850 --> 00:00:31,890 The Texas Department of Transportation 12 00:00:31,890 --> 00:00:34,500 and the Texas A&M Transportation Institute 13 00:00:34,500 --> 00:00:36,060 conducted lab tests 14 00:00:36,060 --> 00:00:38,070 to propose a revised criteria 15 00:00:38,070 --> 00:00:41,340 and validate those proposals with current field sections. 16 00:00:41,340 --> 00:00:43,080 - Roads with time deteriorate. 17 00:00:43,080 --> 00:00:46,200 It's just a nature of them being exposed 18 00:00:46,200 --> 00:00:48,750 to environment and traffic. 19 00:00:48,750 --> 00:00:51,840 So, whenever you reach that point 20 00:00:51,840 --> 00:00:53,670 you will need to do something to it 21 00:00:53,670 --> 00:00:55,590 to make it functional again. 22 00:00:55,590 --> 00:00:58,980 So, the need for this research was to come up 23 00:00:58,980 --> 00:01:00,600 with mix design strategies 24 00:01:00,600 --> 00:01:05,250 so that we can manufacture these materials 25 00:01:05,250 --> 00:01:07,170 in a more consistent way 26 00:01:07,170 --> 00:01:10,727 and provide that sustained level of service 27 00:01:12,510 --> 00:01:13,740 for the public. 28 00:01:13,740 --> 00:01:15,570 - The original process takes a long time. 29 00:01:15,570 --> 00:01:19,833 It takes 28 days to do all the testing per spec. 30 00:01:20,760 --> 00:01:23,850 So the process that was developed in this 31 00:01:23,850 --> 00:01:28,590 actually allowed us to reduce the amount of time used 32 00:01:28,590 --> 00:01:29,670 to get the samples. 33 00:01:29,670 --> 00:01:31,560 So instead of a 28-day turnaround, 34 00:01:31,560 --> 00:01:34,200 it turned into a seven-day turnaround. 35 00:01:34,200 --> 00:01:35,640 - [Edith] Whenever we started this project, 36 00:01:35,640 --> 00:01:37,990 there was a concern that the mix design methods 37 00:01:38,910 --> 00:01:40,740 could lead to some variability. 38 00:01:40,740 --> 00:01:43,320 And so we as researchers 39 00:01:43,320 --> 00:01:47,940 tried to come up with several ways of exploring variables 40 00:01:47,940 --> 00:01:51,780 that could affect the outcome of the mix design process. 41 00:01:51,780 --> 00:01:53,910 So we look at things in the lab, 42 00:01:53,910 --> 00:01:58,020 like the specimen size, the compaction level, 43 00:01:58,020 --> 00:02:01,440 the curing time and temperature, the testing temperature. 44 00:02:01,440 --> 00:02:03,840 And then with those results we came up with something 45 00:02:03,840 --> 00:02:07,950 that could lead to more consistent results in the lab 46 00:02:07,950 --> 00:02:09,990 and also between laboratory. 47 00:02:09,990 --> 00:02:13,470 So say, TTI is doing the mix design 48 00:02:13,470 --> 00:02:16,410 versus TxDOT versus a contractor. 49 00:02:16,410 --> 00:02:19,320 Everybody's kinda getting the same or similar answer 50 00:02:19,320 --> 00:02:20,820 as close as possible. 51 00:02:20,820 --> 00:02:23,700 - Obviously, any time that we can save in the lab 52 00:02:23,700 --> 00:02:26,970 is time saved on the duration of the contract. 53 00:02:26,970 --> 00:02:28,740 The contractor is basically, 54 00:02:28,740 --> 00:02:30,480 they're time dependent on us 55 00:02:30,480 --> 00:02:33,360 and anytime that they're waiting on us is something that, 56 00:02:33,360 --> 00:02:36,120 you know, we may be responsible for financially. 57 00:02:36,120 --> 00:02:38,850 So anytime that we can eliminate that or minimize that, 58 00:02:38,850 --> 00:02:41,070 it's in TxDOT's benefit 59 00:02:41,070 --> 00:02:44,070 as well as it's for the state's benefit. 60 00:02:44,070 --> 00:02:45,990 - The beauty of these methods is that 61 00:02:45,990 --> 00:02:48,180 it allows for the materials to be stronger, 62 00:02:48,180 --> 00:02:50,211 therefore, they last longer. 63 00:02:50,211 --> 00:02:52,950 The road is also smoother, 64 00:02:52,950 --> 00:02:55,200 so it provides a very nice ride. 65 00:02:55,200 --> 00:02:57,270 And it's also environmentally friendly. 66 00:02:57,270 --> 00:02:59,760 Why? Because you're doing these processes on site. 67 00:02:59,760 --> 00:03:03,180 You're not holding in new materials, new raw materials. 68 00:03:03,180 --> 00:03:05,130 There's also saving on emissions. 69 00:03:05,130 --> 00:03:08,580 So it's a very friendly in terms of the environment, 70 00:03:08,580 --> 00:03:11,340 and also cost savings for the contractor 71 00:03:11,340 --> 00:03:12,420 and even the taxpayer. 72 00:03:12,420 --> 00:03:15,330 You know, you're not having to devote those dollars 73 00:03:15,330 --> 00:03:18,483 and it can be spread out in other maintenance efforts. 74 00:03:20,160 --> 00:03:21,390 - [Narrator] For more information 75 00:03:21,390 --> 00:03:23,790 and to find the publication for this project, 76 00:03:23,790 --> 00:03:26,100 please visit the TxDOT research library 77 00:03:26,100 --> 00:03:27,300 at the link shown below.