BS EN ISO 17892-12:2018+A1:2021

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Geotechnical investigation and testing. Laboratory testing of soil – Determination of liquid and plastic limits

Published By	Publication Date	Number of Pages
BSI	2021	36

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This document specifies methods for the determination of the liquid and plastic limits of a soil. These comprise two of the Atterberg limits for soils.

The liquid limit is the water content at which a soil changes from the liquid to the plastic state.

This document describes the determination of the liquid limit of a specimen of natural soil, or of a specimen of soil from which material larger than about 0,4 mm has been removed. This document describes two methods: the fall cone method and the Casagrande method.

NOTE The fall cone method in this document should not be confused with that of ISO 17892‑6.

The plastic limit of a soil is the water content at which a soil ceases to be plastic when dried further.

The determination of the plastic limit is normally made in conjunction with the determination of the liquid limit. It is recognized that the results of the test are subject to the judgement of the operator, and that some variability in results will occur.

PDF Catalog

PDF Pages	PDF Title
2	National foreword
4	European foreword Anchor 2 European foreword to amendment A1
6	Foreword
7	Introduction
9	1 Scope 2 Normative references 3 Terms and definitions
10	4 Apparatus 4.1 General 4.1.4 Ancillary apparatus.
11	4.2 Fall cone method
13	4.3 Casagrande method
14	4.4 Plastic limit equipment
15	5 Test procedure 5.1 Choice of liquid limit method 5.2 Specimen preparation
16	5.3 Determination of liquid limit by the fall cone method
18	5.4 Determination of liquid limit by the Casagrande method
20	5.5 Determination of plastic limit
21	6 Test results 6.1 Proportion of sample smaller than 0,4 mm 6.2 Liquid limit by the fall cone method
23	6.3 Liquid limit by the Casagrande method 6.4 Plastic limit
24	6.5 Plasticity index 7 Test report 7.1 Mandatory reporting 7.2 Optional reporting
26	Annex A (normative) Calibration, maintenance and checks
33	Annex B (normative) Additional parameters
35	Bibliography