BS 1377 : 1990 – 2 Determination of density, Xác định tỷ trọng của đất
7.1 General
7.1.1 Terminology.
In this standard, density is expressed in terms of mass density. The bulk density of a soil,r, is the mass per unit volume of the soil deposit including any water it contains. The dry density,rd, is the mass of dry soil contained in a unit volume. Both are expressed in Mg/m3, which is numerically the same as g/cm3.
7.1.2 Types of test.
Three methods are specified. The first applies to soils that can be formed into a regular geometric shape, the volume of which can be calculated from linear measurements. In the second the volume of the specimen is determined by weighing it submerged in water. In the third the volume is measured by displacement of water.
BS 1377 : 1990 – 2 Determination of density, Xác định tỷ trọng của đất
7.2 Linear measurement method
7.2.1 General.
7.2.2 Apparatus.
The apparatus required is as specified in 8.2 of BS 1377-1:1990, with the addition of a balance readable to 0.01 g
7.2.3 Preparation of specimens
7.2.4 Measurements
7.2.4.1 Weigh the trimmed specimen to an accuracy of 0.1 % (m).
7.2.5 Calculations and expression of results
7.2.6 Test report.
The test report shall affirm that the test was carried out in accordance with BS 1377-2:1990 and shall include the following information:
- a) the method of test used;
- b) the density and the dry density of the soil specimen;
- c) the moisture content if known;
- d) the information required by clause 9 of BS 1377-1:1990.
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