what are the usages of in situ density tests
Answers
Many civil engineering projects require the use of fill material. Whenever soil is placed as an engineering fill, it is usually compacted to a dense state, to obtain satisfactory engineering properties. Compaction on site is is usually effected by mechanical means such as rolling, ramming or vibrating. Control of compaction is necessary to achieve a satisfactory result at a reasonable cost. Laboratory compaction tests provide the basis for control procedures used on site.
Many civil engineering projects require the use of fill material. Whenever soil is placed as an engineering fill, it is usually compacted to a dense state, to obtain satisfactory engineering properties. Compaction on site is is usually effected by mechanical means such as rolling, ramming or vibrating. Control of compaction is necessary to achieve a satisfactory result at a reasonable cost. Laboratory compaction tests provide the basis for control procedures used on site.
Proctor Penetrometer
This spring-type penetrometer can be used in the field to control soil compaction. The stem is calibrated to 150 lbf x 2 lbf divisions, and a sliding collar indicates the applied load. A rapid estimate of the moisture content of soil can be obtained by comparing the amount of penetration of the needle for a corresponding load, with a laboratory determined moisture/density curve for a similar soil.
Sand Replacement
This equipment is used to determine the dry density of insitu soils. Apparatus is included which satisfies BS, ASTM and AASHTO specifications.
Core Cutter Apparatus
In this method of determining the dry density of in-situ soil, a core-cutter of known volume is driven into the soil by a rammer. The core-cutter is removed, trimmed and the soil obtained is weighed and dried for a moisture/density check.