【AS澳大利亚标准】AS 1289.3.2.1-2009 Methods of testing soils for engineering purposes Method 3.2.1 Soil classification tests - Determination of the plastic limit of a soil- Standard method.doc
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1、AS 1289.3.2.120091 AS 1289.3.2.12009Australian StandardMethods of testing soils for engineering purposesMethod 3.2.1: Soil classification tests Determination of the plastic limit of a soil Standard method1 SCOPEThis Standard sets out a method for determining the plastic limit of a soil (the moisture
2、 content at which a soil passes from the semi-solid to the plastic state).2 REFERENCED DOCUMENTSThe following documents are referred to in this Standard: AS1289Methods of testing soils for engineering purposes1289.1.1Method 1.1:Sampling and preparation of soilsPreparation of disturbed soil samples f
3、or testing1289.2.1.1 Method 2.1.1: Soil moisture content testsDetermination of the moisture content of a soilOven drying method (standard method)3 APPARATUSThe following apparatus shall be used:(a) A thick, flat, rigid mixing plate of suitable size, made of non-absorbent material. (b)A mixing bowl o
4、f convenient size with a suitable close-fitting lid.(c) Palette knives of convenient size.(d)Frosted glass plate of suitable size on which to roll the threads. (e)A rod 3 mm in diameter and about 100 mm long.(f) Small containers with close-fitting lids.(g)A wash bottle or beaker containing potable w
5、ater.NOTE: Some types of clay may be affected by poor or marginally potable water. In such cases, and when testing for reference purposes, distilled, demineralized or deionized water should be used.4 PROCEDUREThe procedure shall be as follows:(a) Obtain a sample of about 40 g of soil from the materi
6、al passing the 425 m sieve which has been prepared in accordance with the procedure prescribed in AS 1289.1.1.Alternatively, when practically all soil passes a 425 m sieve the material may be used in the natural state without further preparation. Standards AustraliaAS 1289.3.2.12009 2If the plastici
7、ty index is to be calculated using the results from this test, the same method of preparation shall be used for both liquid limit and plastic limit tests.NOTE: If stones are present, only the material passing the 425 m sieve should be used for the test. This can be achieved by rubbing the wet soil t
8、hrough the sieve until a sufficient quantity is obtained. The sieve used for this process should not be one of a set used for a particle size analysis, as the rubbing of wet soil through a sieve results in rapid wear of the sieve. This wear, however, will not have any appreciable effect on the plast
9、ic limit obtained for the sample under test.Then proceed as follows:(i) Record the method of preparation.(ii) Thoroughly mix the soil with the water on the glass mixing plate or in the bowl, and knead until it becomes homogeneous and plastic enough to be shaped into a ball.(iii) Cover the soil and a
10、llow to cure for at least 12 h at room temperature.NOTE: Prior to testing, some clayey soils may require to stand for 24 h to allow thorough permeation of the water through the soil.(b)Take a ball of soil of about 8 g and mould it between the fingers. Then roll the ball between the palms of the hand
11、s until slight cracks appear on its surface. (This is to ensure that the soil has dried sufficiently.) Roll the ball between the hands and the glass plate, or between two glass plates, using sufficient pressure to form the soil into a thread of about 3 mm diameter.(c) If the soil thread crumbles bef
12、ore the diameter reaches 3 mm, add more potable water to the whole soil mass, re-mix on the glass plate, and knead thoroughly.(d)If the soil thread rolls down to 3 mm diameter without crumbling, gather up the soil, knead it together again, and re-roll a thread.The rod shall be used for comparison as
13、 a guide to the correct thread diameter.(e) Repeat Step (d) until the thread crumbles when it becomes 3 mm in diameter. Gather the portions of the crumbled thread into the container and cover the container. When threads of at least 3 mm in diameter cannot be rolled owing to the lack of cohesion of t
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