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The document discusses different methods for compacting soil and measuring soil density. It describes the Proctor compaction test which determines maximum dry density at optimum moisture content using a standardized mold. It defines relative compaction as the ratio of field dry density to maximum laboratory dry density. Finally, it discusses three common field density test methods - sand cone, rubber balloon, and nuclear devices - and provides diagrams of associated testing apparatuses.

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Allan Añavisa Ostique Jr.
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695 views8 pages

Ce Board

The document discusses different methods for compacting soil and measuring soil density. It describes the Proctor compaction test which determines maximum dry density at optimum moisture content using a standardized mold. It defines relative compaction as the ratio of field dry density to maximum laboratory dry density. Finally, it discusses three common field density test methods - sand cone, rubber balloon, and nuclear devices - and provides diagrams of associated testing apparatuses.

Uploaded by

Allan Añavisa Ostique Jr.
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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COMPACTION OF SOIL

BRC_OYEAH
Proctor Compaction Test
- a laboratory test to determine the maximum dry density of
a particular soil at an optimum moisture content.
Typical Moisture-Density Curve
Dry Density
γdmax

Moisture Content
woptimum

Note: Proctor mold has a standard volume of 1/30 ft3

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Relative Compaction (R)
- the ratio of dry density (or unit weight) in the field to the
maximum dry density (or unit weight) in the laboratory.

γdfield RO(100)
R= (100) or: R=
γdmax 1 – Dr(1 – RO)

where: γdfield = dry unit weight in the field


γdmax = maximum dry unit weight in the laboratory
RO = γdmin/γdmax
Methods of Field Density Test (FDT)
1. Sand-Cone Method
2. Rubber-Balloon Method
3. Nuclear Device Method

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Sand – Cone Apparatus
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Rubber – balloon Apparatus

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Nuclear Density Meter

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Proctor Compaction Apparatus
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Problem (CE – Board, May 2007)
The laboratory compaction test of a certain type of soil gives
a maximum dry density of 1.486 Mg/m3 with an optimum
moisture content of 12.5%. The following are the results of a
field unit weight determination test using sand cone method.
Volume of soil excavated from the hole = 0.001337 m3
Wet weight of the soil = 2220 grams
Weight of dry soil = 1890 grams

Determine the following:


1. Field unit weight of the soil. (ans. 1.66 g/cc)
2. In situ moisture content. (17.46%)
3. Is the relative compaction within the allowable range of
95±0.20? (ans. Yes)

BRC_OYEAH

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