Question

Referring to Table 5.6, plot the specification limits of Superpave gradation with a nominal maximum size of 19 mm on a 0.45 gradation chart (Figure A.25). What is the maximum aggregate size of this gradation? Is this a dense, open, or gap graded gradation? Why? Reference: Table 5.6 TABLE 5.6 Aggregate Grading Requirements for Superpave Asphalt Mix Designs (AASHTO MP-2) Nominal Maximum Size (mm) Sieve Size, mm in.) 50 (2 in.) 37.5 (1 1/2 in.) 25 (1 in.) 19 (3/4 in.) 12.5 (1/2 in.) 9.5 (3/8 in.) 4.75 (No. 4) 2.36 (No. 8) 1.18 (No. 16) 0.075 (No. 200) 0.0-6.0 25 19 12.5 9.5 4.75 37.5 100 90-100 100 90 max 90-100 100 100 90-100 90 max 90 max 90-100 90 max 100 90-100 90 max 100 95-100 90-100 1541 19-45 23-4928-58 32-67 1.0-7.0 2.0-8.0 2.0-10.0 2.0-10.0 30-60 6.0-12.0
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max size is 25mm

Gap graded by looking at graph

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