65 sedangkan tanah berbutir halus mempunyai nama A4; A5; A6 dan A7. Untuk lebih detailnya dapat dilihat pada tabel berikut: Tabel 3.7. Klasifikasi tanah berdasarkan sistem AASTHO (Das, 1995) AASHTO Soil Classification System (M145) Granular Materials Silt-Clay Materials General Classification 35%or less passing the 0.075 mm sieve >35% passing the 0.075 mm sieve A-1 A-2 A7 Group Classification A-3 A2-4 A2-5 A2-6 A2-7 A4 A5 A6 A7-5 A-1-a A-1-b A7-6 Sieve Analysis, % passing 2.000 mm (No. 10) 50 max --- --- --- --- --- --- --- --- --- --- 0.425 mm (No. 40) 30 max 50 max 51 max --- --- --- --- --- --- --- --- 0.075 mm (No.200) 15 max 25 max 10 max 35 ma x 35 ma x 35 ma x 35 ma x 36 mi n 36 mi n 36 mi n 36 mi n Characteristics of fraction passing 0.425 mm (No. 40) Liquid Limit --- --- 40 ma x 41 mi n 40 ma x 41 mi n 40 ma x 41 mi n 40 ma x 41 mi n Plasticity Index 6 max N.P. 10 ma x 10 ma x 11 mi n 11 mi n 10 ma x 10 ma x 11 mi n 11 mi n Usual Type of significant constituent materials stone fragments, gravel and sand fine san d silty or clayey gravel and sand silty soils clayey soils General rating as a subgrade excellent to good fair to poor
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