Short-Term Laboratory Conditioning of Asphalt Mixtures (2015) / Chapter Skim
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A-1 Construction Reports Texas Farm-to-Market Highway 973 (TX I FM 973)
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Location & Climate Date Plant Type TProduction Asphalt Aggregate & Additives Mixtures Factors Texas I FM 973 Wet–No Freeze 1/12 CFD 325°F (163°C)
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A-3 Figure A-1. Project limits for the Texas field site.
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Figure A-3. Mixture design used in Test Section 1 (HMA without RAP or RAS, PG 70-22)
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A-5 Plant and Mixture Production The Ramming Paving Company's RTI division (referred to as RTI) hot mix plant located in Buda, Texas, supplied the asphalt mixture .
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A-6 the paver hoper (see Figure A-6)
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A-7 Figure A-8. Loose mix collection from the truck at RTI hot mix plant.
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A-8 The road cores were drilled at the center of the travel lane (between wheelpath) , spread approximately equal distance on both directions .
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A-10 placing the overlay, the top of the existing pavement was milled off 2 .5 in .
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A-11 Figure A-15. Mix design for HMA and WMA mixtures with 35 percent RAP.
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A-12 Figure A-16. Mix design for HMA mixture without RAP.
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A-13 Figure A-17. Asphalt mixture plant at the New Mexico field site.
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A-14 Oldcastle Materials Group, was the contractor for this overlay paving job . This stretch of IH 84 is a heavily trafficked road located in urban area .
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A-15 Figure A-21. Mix design for CT IH 84.
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A-16 Plant and Mixture Production The asphalt plant was an Astec double barrel, a counter-flow drum design with an external mixing drum (Figure A-22)
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A-17 Field LMLC Specimen Compaction NCAT's mobile laboratory was on site for both nights of paving . Twenty-five 5-gal buckets of mixture were sampled each night about 2 hours into production once the plant was running smoothly .
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A-18 Construction The average distance between the asphalt plant and the construction site was only 3 mi (4 .8 km)
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A-19 Figure A-27. Breakdown with vibratory rollers.
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A-20 and longitudinal cracking . Before the placement of the overlay, the existing pavement was milled to a depth of 1 .0 in .
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A-21 Figure A-32. HMA mix design for South Dakota SD 262.
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A-22 Typically, the plant operator started the production at a higher temperature and lowered to the target mixing temperature within four to five truck loads . In this project, the majority of the asphalt mixture was supposed to be HMA .
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A-23 Large quantities of mixtures were collected for later use in the laboratory at TTI . The materials sampling scheme is presented in Table A-18 .
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A-24 The high-absorptive aggregate blends had limestone aggregate from Martin Marietta, Sully Mine, located just south of Newton, Iowa . Although both blends used field sand from the same source, the high-absorptive blends used 20 percent RAP from a different source .
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A-25 Figure A-37. Central Iowa Expo Center low-absorption HMA mix design.
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A-26 Figure A-38. Central Iowa Expo Center high-absorption HMA mix design.
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A-27 Plant and Mixture Production The asphalt plant, a Cedar Rapids E 400 SL (Figure A-39) , was a counter-flow drum .
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A-28 into the paver hopper . This job used one standard-sized steelwheeled roller and a small steel-wheeled finish roller .
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A-29 PMPC Specimen Compaction Sixty-four 6-in .
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A-30 Production The Astec DBG plant (Figure A-42) used to produce the mixtures for this field evaluation was located in Jacksonville, Florida, approximately 30 mi from the site .
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A-31 was approximately 30 mi from the site, and the haul time was 40 minutes to 1 hour . Figure A-45 shows the test section layout and Figure A-46 shows the paving site in relation to the plant .
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A-32 Table A-27. Design gradation, asphalt content, and volumetrics for plant-produced limestone mixtures.
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A-33 Figure A-46. Location of plant and paving site in Jacksonville, Florida.
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A-34 the paver with a handheld temperature gun . Tables A-28 and A-29 show the temperatures of the mixture in the auger and behind the screed, respectively .
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A-35 were then tested according to AASHTO T 331 . Average test results are shown in Table A-31 .
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A-36 WMA using the foaming technology AquaFoam® at 2 percent by weight of the binder . All the mixtures were produced based on the same mix design .
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A-37 On the third day of production, August 21, a WMA mix was produced using the modified batch plant with the WMA additive Advera . Mixture production started at approximately 7:20 a .m .
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Property JMF HMA Batch WMA Batch HMA Drum WMA Drum Control Points Sieve Size % Passing 19.0 mm (3/4")
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A-39 Figure A-55. Locations of plant and paving site in Indianapolis, Indiana.
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A-40 Figure A-56. RoadTec paver used in Indianapolis, Indiana.
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A-41 Figure A-59. Example of compacted WMA (batch plant)
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Figure A-61. Mix design used in Midland–Odessa field site.
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A-43 compactor . The design asphalt content was 6 .2 percent .
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A-44 Figure A-64. Paving with windrow operation at the Midland–Odessa field site.
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A-45 Sample Type Material Point of Sampling Lab Mixed, Lab Compacted Fine Aggregate Stockpile Coarse Aggregate Stockpile PG 64-22 Asphalt Transport Truck PG 76-22 Asphalt Transport Truck Plant Mixed, Lab Compacted Loose Mix Windrow Plant Mixed, Field Compacted Road Cores Center of the Paving Width Table A-42. Materials sampling scheme for the Midland–Odessa field site.
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