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1、 1 AS 1289.2.1.52005 Standards Australia Australian Standard TM Methods of testing soils for engineering purposes Method 2.1.5: Soil moisture content tests Determination of the moisture content of a soil Infrared lights method (subsidiary method) 1 SCOPE This Standard sets out the method for the det
2、ermination of the moisture content of a soil as a percentage of its dry mass using a system of infrared lights. The infrared lights method is a rapid method, and is considered less accurate than the standard method (see AS 1289.2.1.1). This method is not suitable for soils containing gypsum, calcare
3、ous or organic matter since the temperature of drying cannot be controlled. 2 REFERENCED DOCUMENTS The following documents are referred to in this Standard: AS 1289 Methods of testing soils for engineering purposes 1289.1.1 Method 1.1: Sampling and preparation of soilsPreparation of disturbed soil s
4、amples for testing 1289.2.1.1 Method 2.1.1: Soil moisture content testsDetermination of the moisture content of a soilOven drying method (standard method) 1289.2.3.1 Method 2.3.1: Soil moisture content testsEstablishment of correlation Subsidiary method and the standard method 2243 Safety in laborat
5、ories 2243.7 Part 7: Electrical aspects 3 APPARATUS The following apparatus is required: (a) Heat-resistant and corrosion-resistant containers of suitable dimensions. (b) A system of one or more lights with 250 W infrared globes with each globe having approximately 150 mm clearance above a container
6、 base. NOTE: The infrared light system used should comply with the appropriate requirements of AS 2243.7. (c) Suitable balance with limit of performance as shown in Table 1. (d) A palette knife of convenient size. (e) A timer with an alarm. AS 1289.2.1.52005 Accessed by TAFE QUEENSLAND INSTITUTES on
7、 04 Dec 2007 AS 1289.2.1.52005 2 Standards Australia .au TABLE 1 BALANCE CAPACITY, LIMIT OF PERFORMANCE AND PRECISION OF MEASUREMENT Sample size (see AS 1289.1.1) Limit of performance of balance not greater than g g 100 0.05 100 and 500 0.5 500 5 4 PROCEDURE The procedure shall be as follows: (a) Pr
8、epare a suitable size representative subsample in accordance with AS 1289.1.1. (b) Determine the mass of a clean and dry container (ma). Place a subsample of soil in the container and determine the mass of the container and wet soil (mb). (c) Place the container under an infrared globe and turn on t
9、he power. Set the timer for 25 min. (d) Dry for 25 min, stirring the sample with the palette knife after about 10 min and 20 min to assist the evaporation of the moisture. (e) Remove the container from beneath the globe and allow the container and contents to cool until the container is warm to touc
10、h. (f) Determine the mass of the container and dry soil (mic). (g) Replace the container with the soil underneath the globe and then dry for at least a further 10 min and repeat Steps (e) and (f). (h) Repeat Step (g) until the loss of mass in the soil between successive drying periods is less than 0
11、.1% of the initial mass of the wet soil. Record the last mass determined as mc. 5 CALCULATIONS Calculate the moisture content (w) of the soil as a percentage of the dry soil mass from the following equation: 100 ac cb = mm mm w where w= moisture content of soil, in percent mb = mass of container and
12、 wet soil, in grams mc = mass of container and dry soil, in grams ma = mass of container, in grams NOTE: A method of correlating results from this method with the standard method is given in AS 1289.2.3.1, and this approach should be applied. Accessed by TAFE QUEENSLAND INSTITUTES on 04 Dec 2007 3 A
13、S 1289.2.1.52005 .au Standards Australia 6 TEST REPORT The following shall be reported: (a) The moisture content (w) of the soil in percent to (i) the nearest 0.1 for w less than 50%; (ii) the nearest 0.5 for w between 50 and 100%; and (iii) the nearest 1.0 for w greater than 100%. (b) Where a corre
14、lation derived from AS 1289.2.3.1 has been used to correct the result, the original and amended values. (c) Reference to this Standard, i.e., AS 1289.2.1.5. Accessed by TAFE QUEENSLAND INSTITUTES on 04 Dec 2007 AS 1289.2.1.520054 This Australian Standard was prepared by Committee CE-009, Testing of
15、Soils for Engineering Purposes. It was approved on behalf of the Council of Standards Australia on 15 March 2005 and published on 26 April 2005. The following are represented on Committee CE-009: AUSTROADS Australian Building Codes Board Australian Chamber of Commerce and Industry Australian Geomech
16、anics Society Australian Stabilisation Industry Association Cement Concrete and Aggregates Australia Certification Interests (Australia) Department of Transport and Works Northern Territory Engineering and Construction Laboratories Association Engineers Australia University of Melbourne University o
17、f Sydney Keeping Standards up-to-date Standards 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 withd
18、rawn. 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 r
19、elevant Standard in the on-line catalogue. Alternatively, the printed Catalogue provides information current at 1 January each year, and the monthly magazine, The Global Standard, has a full listing of revisions and amendments published each month. We also welcome suggestions for the improvement in
20、our 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 5420, Sydney, NSW 2001. First published as AS 12892.B1.51988. Revi
21、sed and redesignated AS 1289.2.1.51992 Second Edition AS 1289.2.1.52005. This Standard was issued in draft form for comment as DR 04010. 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, incl
22、uding photocopying, without the written permission of the publisher. Published by Standards Australia Limited GPO Box 5420, Sydney, NSW 2001, Australia ISBN 0 7337 6647 1 Printed in Australia Accessed by TAFE QUEENSLAND INSTITUTES on 04 Dec 2007 Thi s page has been l ef t i nt ent i onal l y bl ank. Accessed by TAFE QUEENSLAND INSTITUTES on 04 Dec 2007