Answered: For cohesive soil fill, what is the…

For cohesive soil fill, what is the relationship between dry density and moisture content in the proctor (soil compaction) test?

Construction Materials, Methods and Techniques (MindTap Course List)

4th Edition

ISBN:9781305086272

Author:William P. Spence, Eva Kultermann

Publisher:William P. Spence, Eva Kultermann

Chapter5: Soils

Section: Chapter Questions

Problem 2RQ: How is the plasticity index of a soil determined?

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Concept explainers

Soil Compaction Test

Soil compaction is the major area of geotechnical engineering. Soil is composed of multiple pores present on its surface, while the soil is mainly composed of gravel, sand, rocks, etc. The arrangement of these rocks and gravels is such that they build up voids (spaces) between them, which allows spaces for the roots of the plants and crops to spread and absorb the required amount of nutrients. Soil compaction is a major problem primarily caused by human activities, micro-organisms, and other multiple factors.

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For cohesive soil fill, what is the relationship between dry density and moisture content in the proctor (soil compaction) test?

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How is the plasticity index of a soil determined?
A soil sample was taken from a proposed cut area in a highway construction project and sent to a soils laboratory for a compaction test, using the Standard Proctor compaction procedure. Results of the test are as follows: Maximum dry unit weight = 112.6 lb/ft3 %3D Optimum moisture content = 15.5% The contractor, during construction of the soil em-bankment, achieved the following: Dry unit weight reached by field compaction = 107.1 Ib/ft3 Actual water content 16.0% %3D Determine the percent compaction achieved by the contractor.
Dynamic loading, Vibro static test, Standard proctor and modified proctor are tests to determine soil compaction characteristics. Is it true ?
For cohesive soil fill, what is the relationship between dry density and moisture content in the proctor (soil compaction) test? Subject : Soil Mechanics
1. Classify the following soil to be used as a highway subgrade material using AASHTO method. Sieve Analysis % Finer No. 10 sieve = 88% No. 40 sieve = 75% No. 200 sieve = 34 % Plasticity for fraction passing No.4 Liquid Limit = 39% Plasticity Index = 12% %3D
Problem 1 The following grain size distribution test results were obtained from sieve analysis test. Percent Passing U.S. Sieve Number 4 100 10 90 20 64 40 38 08 200 18 13 Also, the Atterberg test results revealed the following results LL = 23 and PL = 19 Classify the soil by using a) AASHTO soil classification system b) USCS soil classification system Give group names and group symbols. Show the GSDC and sketch of finding necessary information from GSDC. Problem 2
Subject: Soil Mechanics A. Classify the Soil Using USCS (with explanation/ justification) Given data: D10 = ? D30= 0.0023mm D60= 0.032mm Liquid Limit= 49% Plastic Limit= 24% CHOICES: a. CL (lean clay with gravel) b. CL ( lean clay with sand) c. ML (silt with gravel) d. ML (Silt with sand)
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The modified Proctor test (ASTM D 698, method C) was performed for a soil with G, = 2.70, and the results are as follows: Moist Weight in Mold, gf Water Content, % 6.5 3250 9.3 3826 12.6 4293 14.9 4362 17.2 4035 18.6 3685 (a) Plot the Ya versus w relation. (b) Determine Ya.max and wopt• (c) Calculate S and e at the maximum dry unit weight point. (d) What is Y at w. (e) What is the range of water content if the relative compaction (R.C.) is required to be 95% of the modified Proctor Ya.max? pt? opr?
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