Table 5.1 Classification of Highway Subgrade MaterialsThe sieve analysis of ten soils and the liquidand plastic limits of the fraction passingthrough the No. 40 sieve are given below.Classify the soils using the AASHTOclassification system and give the groupindexes.GeneralclassificationGranular materials(35% or less of total sample passing No. 200)А-1A-2Group classificationSieve analysis(percentage passing)А-1-аA-1-bA-3A-2-4A-2-5A-2-6A-2-7No. 1050 max.No. 4030 max.50 max. 51 min.No. 20015 max.25 max.10 max.35 max.35 max.35 max.35 max.Sieve analysis(percent finer)Characteristics of fractionpassing No. 40Liquid limitPlasticity indexUsual types of significantconstituent materialsGeneral subgrade ratingSoilNo.LiquidlimitPlasticlimitNo. 10No. 40No. 20040 max.41 min.40 max.41 min.6 max.NP10 max.10 max.11 min.11 min.19880503829Stone, fragments,gravel and sandFinesandSilty or clayey gravel, and sand210092805623310088653722Excellent to good48555452820Silt-clay materials(more than 35% of total sample passing No. 200)59275624328General classificationА-7А-7-5°Group classificationA-5A-6A-7-6A-4Sieve analysis (percentage passing)No. 10No. 40No. 20036 min.36 min.36 min.36 min.Characteristics of fraction passing No. 40Liquid limitPlasticity indexUsual types of significant constituent materialsGeneral subgrade rating40 max.41 min.40 max.41 min.10 max.10 max.11 min.11 min.Silty soilsClayey soilsFair to poor"For A-7-5, PI S LL - 30"For A-7-6, PI > LL - 30

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The sieve analysis of ten soils and the liquid and plastic limits of the fraction passing through the No. 40 sieve are given below. Classify the soils using the AASHTO classification system and give the group indexes. Sieve analysis (percent finer) Soil No. Liquid limit Plastic limit No. 10 No. 40 No. 200 1 98 80 50 38 29 100 92 80 56 23 3 100 88 65 37 22 4 85 55 75 45 28 20 5 92 62 43 28

The sieve analysis of ten soils and the liquid and plastic limits of the fraction passing through the No. 40 sieve are given below. Classify the soils using the AASHTO classification system and give the group indexes. Sieve analysis (percent finer) Soil No. Liquid limit Plastic limit No. 10 No. 40 No. 200 1 98 80 50 38 29 100 92 80 56 23 3 100 88 65 37 22 4 85 55 75 45 28 20 5 92 62 43 28

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter4: Soil Classification

Section: Chapter Questions

Problem 4.1P: State whether the following are true or false. a. In the AASHTO classification Table 4.1, the soils...

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