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Resin Modified Pavement Demonstration Project.pdf

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Table 2Open-Graded Mixture Aggregate GradationSieve SizePercent Passing by Weight19 mm (3/4 in.) 10012.5 mm (1/2 in.) 54-769.5 mm (3/8 in.) 38-604.75 mm (No. 4) 10-262.36 mm (No. 8) 8-16600 μm (No. 30) 4-1075 μm (No. 200) 1-3whereOptimum asphalt content = 3.25 αΣ 0.2α = 2.65/SGSG = apparent specific gravity of the combined aggregatesΣ = conventional specific surface area= 0.21G + 5.4S + 7.2s + 135fG = percentage of material retained on 4.75 mm sieveS = percentage of material passing 4.75 mm sieve and retained on600 μm sieves = percentage of material passing 600 μm sieve and retained on75 μm sievef = percentage of material passing 75 μm sieveOnce the optimum asphalt content is estimated using this equation, twoasphalt contents below this amount and two asphalt contents above this amountare used, along with the estimated optimum, in the laboratory production andevaluation of 75-mm (6-in.) diameter Marshall specimens. The open-graded ACspecimens are compacted with 25 blows from a 4.5-kg (10-lb) Marshall handhammer on one side of each specimen. The temperature of the laboratoryproduced asphalt mixture during compaction is usually around 121 C (250 F).After the laboratory specimens have been compacted and cooled, they are weighedin air and water to determine bulk density and void contents. The optimumasphalt content is typically selected where the resulting void content is nearest to30 percent.<strong>Resin</strong> modified groutG - 16

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