Answered: a) What field equipment would you…

a) What field equipment would you specify to compact the soil in the field, and why? b) How would you check that the specified dry unit weight and water content are achieved in the field?

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter4: Plasticity And Structure Of Soil

Section: Chapter Questions

Problem 4.3P

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Concept explainers

Weight-Volume relationships

Weight is defined as the quantity of matter contained in a body. Weight can also be defined as the force acting on a body due to gravity. Mathematically, weight can be defined as-

Question

A fine-grained soil has 60% clay with LL 220%, PL 545%, and a natural water content of 6%. A
standard Proctor test was carried out in the laboratory and the following data were recorded
Diameter of mold = 101.40 mm Height of mold = 116.70 mm Mass of mold = 4196.50 gram Specific gravity, Gs = 2.69

a) What field equipment would you specify to compact the soil in the field, and why?
b) How would you check that the specified dry unit weight and water content are achieved
in the field?

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A compaction test was conducted in the laboratory and the following information was obtained: • The weight of the compacted soil specimen (including the mold) was determined to be 3815 • The volume of the mold = 1/30 ft³ (944 cm³) • The weight of the mold = 2050 g • The water content in the soil was determined to be 9.1% Find the dry unit weight of the soil (in units of kN/m³).
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