Standard Proctor Compaction Test for Soil

Standard Proctor Compaction Test for
Soil

Table of Contents
INTRODUCTION...........................................................................................................................1
MAIN BODY...................................................................................................................................1
Proctor Compaction Test.............................................................................................................1
Energy from Standard Proctor Compaction Test.........................................................................2
Relationship Between Water Content and Dry Unit Weight.......................................................3
Way to Determine Maximum Dry Weight and Optimum water content.....................................3
Zero Air Content Line..................................................................................................................4
CONCLUSION................................................................................................................................4
REFERENCES................................................................................................................................6

INTRODUCTION
The Proctor compaction test is a Laboratory process that is used to experimentally
determining the optimal content of moisture at which particular type of soil will become most
density and will achieve maximum dry density (Gurtug, Sridharan and Ikizler, 2018). Soil
compaction is known as process in which stress is applied on soil causes densification of soil as
air displace form the pores between the Soil grains. The proctor compression can be observed by
using process of soil consolidation. In this test a specific procedure is followed to evaluate the
optimum water content, maximum dry unit weight and Zero air content line of particular soil
sample.
MAIN BODY
Proctor Compaction Test
In the proctor Compaction test different soil samples are used with given water content
with in a mould with standard compaction energy. As per the standard process in this test a
mould of 4 Inch diameter is used with the compaction of three separate layers of soil using 25
blows of 5.5 Lb hammer that fall form 12 inches. In this process initially soil is dried and then
divided in 4 to 6 different samples. The water content of each ample is adjusted by adding
different amount in each sample (Force, 2019). The percentage of water added in each sample
depends on type of soil that is consider for the test. After this process these soil samples are
placed and compacted in proctor compaction mould in three different layer after placement of
each layer it is compacted with 25 blows of standard hammer. After each hammering process soil
sample is scratched in order to keep the uniform distribution for compaction impact. At the end
of test each sample is removed form mould and dried, dry density and water content of each
compaction test is measured. As per the data collected in the process a curve plotted in the end
between dry unit weight as function of water content in sample (Phai and Eisazadeh, 2019). By
using this curve the optimum water content to reach maximum dry density can be calculated.
This is how complete test is performed in order to evaluate different variables which are
important to know the
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