Purpose:
This laboratory test is performed to determine the relationship between the
moisture content and the dry density of a soil for a specified compactive effort.
The compactive effort is the amount of mechanical energy that is applied to the
soil mass. Several different methods are used to compact soil in the field, and
some examples include tamping, kneading, vibration, and static load compaction.
This laboratory will employ the tamping or impact compaction method using the
type of equipment and methodology developed by R. R. Proctor in 1933,
therefore, the test is also known as the Proctor test.
Two types of compaction tests are routinely performed: (1) The Standard
Proctor Test, and (2) The Modified Proctor Test. Each of these tests can be
performed in three different methods as outlined in the attached Table 1. In the
Standard Proctor Test, the soil is compacted by a 5.5 lb hammer falling a
distance of one foot into a soil filled mold. The mold is filled with three equal
layers of soil, and each layer is subjected to 25 drops of the hammer. The
Modified Proctor Test is identical to the Standard Proctor Test except it employs,
a 10 lb hammer falling a distance of 18 inches, and uses five equal layers of soil
instead of three. There are two types of compaction molds used for testing. The
smaller type is 4 inches in diameter and has a volume of about 1/30 ft3
(944 cm3
),
and the larger type is 6 inches in diameter and has a volume of about 1/13.333 ft3
(2123 cm3
). If the larger mold is used each soil layer must receive 56 blows
instead of 25 (See Table 1).
Purpose: This laboratory test is performed to determine the relationship between themoisture content and the dry density of a soil for a specified compactive effort.The compactive effort is the amount of mechanical energy that is applied to thesoil mass. Several different methods are used to compact soil in the field, andsome examples include tamping, kneading, vibration, and static load compaction.This laboratory will employ the tamping or impact compaction method using thetype of equipment and methodology developed by R. R. Proctor in 1933,therefore, the test is also known as the Proctor test. Two types of compaction tests are routinely performed: (1) The StandardProctor Test, and (2) The Modified Proctor Test. Each of these tests can beperformed in three different methods as outlined in the attached Table 1. In theStandard Proctor Test, the soil is compacted by a 5.5 lb hammer falling adistance of one foot into a soil filled mold. The mold is filled with three equallayers of soil, and each layer is subjected to 25 drops of the hammer. TheModified Proctor Test is identical to the Standard Proctor Test except it employs,a 10 lb hammer falling a distance of 18 inches, and uses five equal layers of soilinstead of three. There are two types of compaction molds used for testing. Thesmaller type is 4 inches in diameter and has a volume of about 1/30 ft3 (944 cm3),and the larger type is 6 inches in diameter and has a volume of about 1/13.333 ft3(2123 cm3). If the larger mold is used each soil layer must receive 56 blowsinstead of 25 (See Table 1).
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