Laboratory tests performed on a saturated alluvial subgrade soil gave the following information:In situ water content = 11.9%, Specific gravity = 2.65, Soil size distribution: D100 = 51 mm, D75 = 30 mm, D60 = 20 mm, D45 = 15 mm, D30 = 8 mm, D10 = 4.76 mm, D8 = 2 mm, D4 = 0.08 mm, < 2 m = 4%a. Is this soil well graded? Classify it by the AASHTO and Unified systemsb. Using the sieve analysis soil data and the classification systems, estimate for a total of 100% the approximate percentages of coarse aggregate (gravel), fine aggregate (sand), silts, and clays?

Given: water content w=11.9% Specific gravity G=2.65 D30=8 mmD60=20 mmD10=4.76 mm

Answered: Laboratory tests performed on a…

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter5: Soil Compaction

Section: Chapter Questions

Problem 5.14P

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Laboratory tests performed on a saturated alluvial subgrade soil gave the following information:

In situ water content = 11.9%, Specific gravity = 2.65, Soil size distribution: D₁₀₀ = 51 mm, D₇₅ = 30 mm, D₆₀ = 20 mm, D₄₅ = 15 mm, D₃₀ = 8 mm, D₁₀ = 4.76 mm, D₈ = 2 mm, D₄ = 0.08 mm, < 2 m = 4%

a. Is this soil well graded? Classify it by the AASHTO and Unified systems

b. Using the sieve analysis soil data and the classification systems, estimate for a total of 100% the approximate percentages of coarse aggregate (gravel), fine aggregate (sand), silts, and clays?

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