Classify the following soils in Table Q2 (b) by the AASHTO classification systemand give the group indices.Table Q2 (b) APPENDIX IITable 1 AASHTO Soil Classification SystemGeneral classificationGranular materials (35% or less of total sample passing No. 200)A-1A-2Group classificationА-1-аA-1-bА-3A-2-4A-2-5А-2-6A-2-7Sieve analysis(percent passing)No. 1050 max.No. 4030 max.50 max.51 min.No. 20015 max.25 max.10 max.35 max.35 max.35 max.35 max.Characteristics offraction passingNo. 40Liquid limitPlasticity index40 max.41 min.40 max.41 min.6 max.I1 min.11 min.NP10 max.10 max.Usual types ofsignificantSilty or clayey gravel and sandStone fragments,gravel, and sandFinesandconstituentmaterialsExcellent to goodGeneral subgraderatingGeneral classificationSilt-clay materials (more than 35% of total sample passing No. 200)A-7A-7-5*Group classificationA-5A-7-6A-4A-6Sieve analysis (percent passing)No. 10No. 40No. 20036 min.36 min.36 min.36 min.Characteristics offraction passingNo. 40Liquid limitPlasticity index40 max.41 min.40 max.41 min.10 max.10 max.11 min.11 min.Usual types of significantconstituent materialsSilty soilsClayey soilsGeneral subgrade ratingFair to poor*For A-7-5, PI < LL – 30†For A-7-6, PI > LL – 30 Classify the following soils in Table Q2 (b) by the AASHTO classification systemand give the group indices.Table Q2 (b)Percent finer than (sieve analysis)LiquidPlasticSoilLimit*Limit*No. 4No. 10No. 40No. 2002908371464621*Based on portion passing No. 40 sieveRefer Table 1

The soil sample has following characteristics: Percent finer than Sieve No.04=90%. Percent finer…

Answered: Classify the following soils in Table…

Engineering

Civil Engineering

Classify the following soils in Table Q2 (b) by the AASHTO classification system and give the group indices.

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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Concept explainers

Soil classification and characteristics

Soil classification is a method of categorizing soil based on its properties, types, and uses. The motive of soil classification is to arrange various types of soils and divide them into groups for various engineering and agricultural purposes. Soil classification is carried out by various agencies as per their purposes. From an engineering perspective, soil classification is done to find out the suitability of soil for various construction purposes like the construction of dams, foundations, highways, infrastructures, and so on. For engineering purposes, the soil is classified by the following systems:

Question

Classify the following soils in Table Q2 (b) by the AASHTO classification system
and give the group indices.
Table Q2 (b)

APPENDIX II
Table 1 AASHTO Soil Classification System
General classification
Granular materials (35% or less of total sample passing No. 200)
A-1
A-2
Group classification
А-1-а
A-1-b
А-3
A-2-4
A-2-5
А-2-6
A-2-7
Sieve analysis
(percent passing)
No. 10
50 max.
No. 40
30 max.
50 max.
51 min.
No. 200
15 max.
25 max.
10 max.
35 max.
35 max.
35 max.
35 max.
Characteristics of
fraction passing
No. 40
Liquid limit
Plasticity index
40 max.
41 min.
40 max.
41 min.
6 max.
I1 min.
11 min.
NP
10 max.
10 max.
Usual types of
significant
Silty or clayey gravel and sand
Stone fragments,
gravel, and sand
Fine
sand
constituent
materials
Excellent to good
General subgrade
rating
General classification
Silt-clay materials (more than 35% of total sample passing No. 200)
A-7
A-7-5*
Group classification
A-5
A-7-6
A-4
A-6
Sieve analysis (percent passing)
No. 10
No. 40
No. 200
36 min.
36 min.
36 min.
36 min.
Characteristics of
fraction passing
No. 40
Liquid limit
Plasticity index
40 max.
41 min.
40 max.
41 min.
10 max.
10 max.
11 min.
11 min.
Usual types of significant
constituent materials
Silty soils
Clayey soils
General subgrade rating
Fair to poor
*For A-7-5, PI < LL – 30
†For A-7-6, PI > LL – 30

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