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1、 1 AS 1289.3.3.12009 Standards Australia Australian Standard Methods of testing soils for engineering purposes Method 3.3.1: Soil classification tests Calculation of the plasticity index of a soil 1 SCOPE This Standard sets out a method to calculate the plasticity index of a soil as derived from the
2、 liquid limit and the plastic limit of a soil. 2 REFERENCED DOCUMENTS The following documents are referred to in this Standard: AS 1289 Methods of testing soils for engineering purposes 1289.3.1.1 Method 3.1.1: Soil classification testsDetermination of the liquid limit of a soilFour point Casagrande
3、 method 1289.3.1.2 Method 3.1.2: Soil classification testsDetermination of the liquid limit of a soilOne point Casagrande method (subsidiary method) 1289.3.2.1 Method 3.2.1: Soil classification testsDetermination of the plastic limit of a soilStandard method 3 PROCEDURE The procedure shall be as fol
4、lows: (a)Determine liquid limit in accordance with AS 1289.3.1.1 or AS 1289.3.1.2. If the liquid limit cannot be determined the soil is considered to be non-plastic and the plastic limit need not be determined. (b)If a liquid limit value has been determined, perform the plastic limit in accordance w
5、ith AS 1289.3.2.1 ensuring that the same method of preparation of the soil for the liquid limit and plastic limit has been followed. 4 CALCULATION Using the reported values of wL and wP, calculate the plasticity index (IP) from the following equation: IP= wL wP where IP= plasticity index, in percent
6、. wL= liquid limit, in percent. wP= plastic limit, in percent. AS 1289.3.3.12009 AS 1289.3.3.12009 2 Standards Australia www.standards.org.au 5 TEST REPORT The following shall be reported: (a)The plasticity index (IP), in percent, when both the liquid limit and the plastic limit are determined. (b)W
7、hen the liquid limit or the plastic limit cannot be determined, report the plasticity index as NP (i.e., non-plastic), together with the liquid or plastic limit, if either has been determined. (c)When the plastic limit is equal to or greater than the liquid limit, report the plasticity index as 0 (z
8、ero) and also report both the liquid limit and the plastic limit. (d)The method used to determine the liquid limit, i.e., AS 1289.3.1.1 or AS 1289.3.1.2. (e)Method of preparation and the history of the sample. (f)Reference to this method, i.e., AS 1289.3.3.1. 3 AS 1289.3.3.12009 NOTES AS 1289.3.3.12
9、009 4 This Australian Standard was prepared by Committee CE-009, Testing of Soils for Engineering Purposes. It was approved on behalf of the Council of Standards Australia on 9 December 2008 and published on 6 February 2009. The following are represented on Committee CE-009: AUSTROADS Association of
10、 Geotechnical Testing Authorities (Qld) Australian Building Codes Board Australian Chamber of Commerce and Industry Australian Geomechanics Society Australian Stabilisation Industry Association Cement Concrete and Aggregates Australia Department of Planning and Infrastructure (NT) Engineering and Co
11、nstruction Laboratories Association Engineers Australia National Association of Testing Authorities Australia University of Melbourne University of Sydney Victorian Construction Materials Laboratories Association Keeping Standards up-to-date Standards are living documents which reflect progress in s
12、cience, technology and systems. To maintain their currency, all Standards are periodically reviewed, and new editions are published. Between editions, amendments may be issued. Standards may also be withdrawn. It is important that readers assure themselves they are using a current Standard, which sh
13、ould include any amendments which may have been published since the Standard was purchased. Detailed information about Standards can be found by visiting the Standards Web Shop at .au and looking up the relevant Standard in the on-line catalogue. We also welcome suggestions for the improvement in ou
14、r Standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. Contact us via email at mailstandards.org.au, or write to the Chief Executive, Standards Australia Limited, GPO Box 476, Sydney, NSW 2001. Originated as AS A89.4A1966. Revised and rede
15、signated as AS 1289.C3.11977. Revised and redesignated as AS 1289.3.3.11995. Second edition 2009. This Standard was issued in draft form for comment as DR 06693. COPYRIGHT Standards Australia All rights are reserved. No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher. Published by Standards Australia Limited GPO Box 476, Sydney, NSW 2001, Australia ISBN 0 7337 9006 2 Printed in Australia This page has been left intentionally blank.