Answered: s 17%, how much water, in gallons, must…

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Civil Engineering

s 17%, how much water, in gallons, must be added per cubic yard of compacted soil to meet the specification?

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 5.16P

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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.

Question

. The maximum dry unit weight obtained from a standard compaction test on a silty sand forest road subgrade soil is 110 lb/ft³. The corresponding optimum water content is 26%.

The compaction specifications call for compaction to 90% or greater of the maximum dry unit weight by the standard compaction test, and a water content of 2% less than the optimum water content.

If the existing natural water content is 17%, how much water, in gallons, must be added per cubic yard of compacted soil to meet the specification?

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