【AS澳大利亚标准】AS 1289.3.3.1 Methods of testing soils for engineering purposes Method 3.3.1 Soil classification testsCalculation of the plasticity index of a soil

1 AS 1289.3.3.1—2009Australian Standard®Methods of testing soils for engineering purposesMethod 3.3.1: Soil classification tests— Calculation of the plasticity index of a soil1 SCOPEThis Standard sets out a method to calculate the plasticity index of a soil as derived from the liquid limit and the plastic limit of a soil.2 REFERENCED DOCUMENTSThe following documents are referred to in this Standard: AS1289 Methods of testing soils for engineering purposes1289.3.1.1 Method 3.1.1: Soil classification tests—Determination of the liquid limit of a soil—Four point Casagrande method1289.3.1.2 Method 3.1.2: Soil classification tests—Determination of the liquid limit of asoil—One point Casagrande method (subsidiary method)1289.3.2.1 Method 3.2.1: Soil classification tests—Determination of the plastic limit of a soil—Standard method3 PROCEDUREThe procedure shall be as follows:(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 with 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.ON4 CALCULATI −Using the reported values of wL and wP, calculate the plasticity index (IP) from thefollowing equation:© Standards AustraliawhereIP = wL wPAS 1289.3.3.1—2009IP = plasticity index, in percent.wL = liquid limit, in percent.wP = plastic limit, in percent.AS 1289.3.3.1—2009 25 TEST REPORTThe following shall be reported:(a) The plasticity index (IP), in percent, when both the liquid limit and the plastic limit are determined.(b) When 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 (zero) 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.© Standards Australiawww.standards.org.au3 AS 1289.3.3.1—2009NOTESAS 1289.3.3.1—2009 4This Australian Standard® was prepared by Committee CE-009, Testing of Soils for Engineering Purposes. It was approved on behalf of theCouncil of Standards Australia on 9 December 2008 and published on 6 February 2009.The following are represented on Committee CE-009: AUSTROADSAssociation of Geotechnical Testing Authorities (Qld)Australian Building Codes BoardAustralian Chamber of Commerce and IndustryAustralian Geomechanics SocietyAustralian Stabilisation Industry AssociationCement Concrete and Aggregates AustraliaDepartment of Planning and Infrastructure (NT)Engineering and Construction Laboratories AssociationEngineers AustraliaNational Association of Testing Authorities AustraliaUniversity of MelbourneUniversity of SydneyVictorian Construction Materials Laboratories AssociationKeeping Standards up-to-dateStandards are living documents which reflect progress in science, 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 should 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 our Standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. Contact us via email at mail@standards.org.au, or write to the Chief Executive, Standards Australia Limited, GPO Box 476, Sydney, NSW 2001.Originated as AS A89.4A—1966.Revised and redesignated as AS 1289.C3.1—1977. Revised and redesignated as AS 1289.3.3.1—1995. Second edition 2009.This Standard was issued in draft form for comment as DR 06693.COPYRIGHT© Standards AustraliaAll 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 LimitedGPO Box 476, Sydney, NSW 2001, AustraliaISBN 0 7337 9006 2 Printed in AustraliaThis page has been left intentionally blank.。