Nondestructive Testing to Identify Delaminations Between HMA Layers, Volume 3 - Controlled Evaluation Reports (2013) / Chapter Skim
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1Controlled Laboratory and Field Evaluations: Construction Report This chapter was prepared by Dr.
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2Full bond No bond at 2" depth 8" 4 ft 8 ft 2" HMA Stripping at 4" depth No bond at 4" depth 8" 4 ft 8 ft 4" 4" Slab A Slab B Figure 1.1. Design of two HMA slabs for controlled laboratory evaluation.
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3 4 in. in one half and a debonded interface at a depth of 4 in.
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4As previously described, the 10 pavement test sections were built in the inside lane adjacent to Section 5 between Stations 0+15 and 2+65. The old pavement section built between those stations was constructed in 2000 with a 24-in.-thick HMA layer on top of a 6-in.-thick aggregate base.
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5 Note: No delamination; O = locations where point-load methods were conducted; and X = verification core. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 1 2 3 4 O X O O O O 5 6 O O O O O 7 8 9 O O O O O 10 11 O O O O O 12 Figure 1.11.
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6Note: Light gray = baghouse dust; delamination depth = ~ 2 in.; O = locations where point-load methods were conducted; X = verification core; and S = standpipe. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 1 2 S 3 O O O O O 4 X 5 O O O O O 6 7 8 O O O O O 9 10 O O O O O 11 12 Figure 1.14.
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7 Note: Dark gray = RAP; bottom of delamination = ~ 5 in.; RAP thickness = ~ 0.75 inches; O = locations where point-load methods were conducted; X = verification core; and S = standpipe. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 1 2 S 3 O O O O O 4 X 5 O O O O O 6 7 8 O O O O O 9 10 O O O O O 11 12 Figure 1.17.
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8621.0 621.5 622.0 622.5 623.0 623.5 624.0 624.5 625.0 0 25 50 75 100 125 150 175 200 225 250 El ev at io n (ft) Longitudinal Distance (ft)
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9 prepare the bottom surface for the delamination test sections. Figure 1.22 shows the concrete slab and the leveling layers of HMA being constructed between Stations 0+65 and 2+65.
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10 After the bottom lift was placed and cooled down, the research team placed the delamination conditions at a depth of 2 in. Because of the problems with the paper as previously discussed, the paper was not used as a bond breaker at the 2-in.
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11 of the control sections) , and this core showed no signs of delamination, as expected.
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12 Lessons Learned The following lessons were drawn from the experience with the construction of the test slabs for controlled laboratory evaluations at the NCAT Pavement Test Track: • Kraft paper was not strong enough to resist tensile forces generated by HMA paving screed as the screed passed over the paper. The top layer of paper tore and slid with the screed.
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