Geotechnical investigation andtesting — Laboratory testing of soil

( ISO 17892-1-2014 ,  ISO 17892-2-2014 )

 

 

Part 1:Determination of water content

۱ Scope

This International Standard specifies a method of determining the water content of soils.This International Standard is applicable to the laboratory determination of the water (also known as moisture) content of a soil test specimen by oven-drying within the scope of geotechnical investigations. The water content is required as a guide to the classification of natural soils and as a control criterion in re-compacted soils, and is measured on samples used for most field and laboratory tests. The oven-drying method is the definitive procedure used in usual laboratory practice.The practical procedure for determining the water content of a soil is to determine the mass loss on drying the test specimen to a constant mass in a drying oven controlled at a given temperature. The mass loss is assumed to be due to free water and is referenced to the remaining dry mass of solid particles.NOTE This document fulfils the requirements of the determination of water content of soils for geotechnical investigation and testing in accordance with EN 1997–۱ and EN 1997–۲.

Part 2:Determination of bulk density

۱ Scope
This International Standard specifies three methods for the determination of the bulk density ofsoils, comprising:
a) linear measurement method;
b) immersion in fluid method;
c) fluid displacement method.
This International Standard is applicable to the laboratory determination of the bulk density of soil within the scope of geotechnical investigations. The linear measurement method is suitable for the determination of the bulk density of a specimen of soil of regular shape, including specimens prepared for other tests. The specimens used are either rectangular prisms or cylinders with circular cross sections.
The immersion in fluid method covers the determination of the bulk density of a specimen of natural or compacted soil by measuring its mass in air and its apparent mass when suspended in fluid. The method may be used when lumps of material of suitable size can be obtained. The fluid displacement method covers the determination of the bulk density of a specimen of soil by measuring its mass in air and the mass of fluid displaced by immersion. The method may be used when lumps of material of suitable size can be obtained. If the immersion in fluid method or fluid displacement method is used, and if the fluid is likely to penetrate into the specimen (eg water) the specimen should be coated before testing to prevent fluid penetration. The bulk density of a soil is useful in the determination of the in situ overburden stress as a function of depth. If required, the dry density of a specimen may be calculated from the bulk density and the water content, if known.
NOTE This International Standard fulfils the requirements of the determination of the bulk density of soils for geotechnical investigation and testing in accordance with EN 1997–۱ and EN 1997–۲.

 

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