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1、 1 AS 1289.5.4.22007 www.standards.org.au Australian Standard Methods of testing soils for engineering purposes Method 5.4.2: Soil compaction and density testsCompaction control testAssignment of maximum dry density and optimum moisture content values 1 SCOPE This Standard sets out the method for as
2、signing maximum dry density and optimum moisture content values. The method is applicable only to very uniform materials and, therefore, usually is confined to manufactured materials such as crushed rocks that have been produced under controlled conditions. NOTE: Occasionally, unprocessed materials,
3、 such as gravels and sands, will be found to meet the required criteria in Table 1. Due to the nature of the deposition and the composition of unprocessed materials, the MDD and OMC may vary throughout the deposit. Checks need to be made, as detailed in Clause 4(e), each time the unprocessed materia
4、ls are used to ensure that the assigned values are still applicable. 2 NORMATIVE REFERENCES The following referenced documents are indispensable for the application of this document: AS 1289 Methods of testing soils for engineering purposes 1289.1.4.1 Method 1.4.1: Sampling and preparation of soilsS
5、election of sampling or test sitesRandom number method 1289.1.4.2 Method 1.4.2: Sampling and preparation of soilsSelection of sampling or test sitesStratified random number method 1289.5.1.1 Method 5.1.1: Soil compaction and density testsDetermination of the dry density/moisture content relation of
6、a soil using standard compactive effort 1289.5.2.1 Method 5.2.1: Soil compaction and density testsDetermination of the dry density/moisture content relation of a soil using modified compactive effort 1289.5.4.1 Method 5.4.1: Soil compaction and density testsCompaction control test Dry density ratio,
7、 moisture variation and moisture ratio 1289.5.5.1 Method 5.5.1: Soil compaction and density testsDetermination of the minimum and maximum dry density of a cohesionless materialStandard method 3 DEFINITIONS For the purposes of this Standard, the definitions below apply. 3.1 Lot An area of work that i
8、s essentially homogeneous in relation to material type and moisture condition, rolling response and compaction technique, and which has been used for the assessment of the density ratio for an area of work with more than one test site. AS 1289.5.4.22007 Accessed by TAFE QUEENSLAND INSTITUTES on 04 D
9、ec 2007 AS 1289.5.4.22007 2 Standards Australia www.standards.org.au 4 PROCEDURE The procedure shall be as follows: (a)Obtain six random samples of the material from not less than three days production, or three lots sampled over two days production in accordance with AS 1289.1.4.1 or AS 1289.1.4.2
10、and AS 1289.5.4.1. Identify the samples in the chronological order in which they were taken. (b)Determine the maximum dry density (MDD) and optimum moisture content (OMC) adjusted for oversize as appropriate, of each sample in accordance with AS 1289.5.1.1, AS 1289.5.2.1 or AS 1289.5.5.1, as appropr
11、iate. (c)Record the values obtained for maximum dry density, and for optimum moisture content. (d)Calculate the mean values for the maximum dry density and optimum moisture content from the set of six test results. If any single result obtained for a property from the six samples differs from the ca
12、lculated mean for that property by more than the limits shown in Table 1, a value for that property shall not be assigned from that set of samples. NOTE: If an error is known or is suspected to have occurred in the testing procedures, all results should be discarded completely, and a new set of six
13、samples should be tested to obtain new mean values. If all results obtained for a property from the six samples do not differ from the mean by more than the limits shown in Table 1 for that property, the mean value for that property, as calculated in Clause 4(d), is designated the assigned maximum d
14、ry density or assigned optimum moisture content, as appropriate. TABLE 1 LIMITS FOR ASSIGNING MAXIMUM DRY DENSITY AND OPTIMUM MOISTURE CONTENT Property Unit Range Limits Mean maximum dry density t/m3 0.05 Mean optimum moisture content % 2.0 to 10.0 10.1.to 15.0 Over 15.1 1.0 1.5 2.0 5 MONITORING ASS
15、IGNED VALUES Monitor the assigned values by determining the maximum dry density and optimum moisture content, in accordance with AS 1289.5.1.1, AS 1289.5.2.1 or AS 1289.5.5.1 as appropriate, of samples taken at regular intervals in accordance with AS 1289.5.4.1 during the period of use of the assign
16、ed values. NOTE: In cases when there is continuous production of the material, one sample per 10 000 t supply or one sample per fortnight, whichever frequency produces the lesser number of samples, should be taken. When values have been assigned for unprocessed materials, one sample shall be taken i
17、n accordance with AS 1289.5.4.1 and tested in accordance with AS 1289.1.4.1 or AS 1289.1.4.2 and AS 1289.5.4.1 as applicable, each time the assigned values are used. Each time a sample is tested to monitor the assigned values, remove the oldest value for each property from the set of six results. Us
18、ing the new result and the remaining five results for each property, recalculate the mean value for each property. Accessed by TAFE QUEENSLAND INSTITUTES on 04 Dec 2007 3 AS 1289.5.4.22007 www.standards.org.au Standards Australia If all results used in calculation of the latest mean value for a prop
19、erty do not differ from the mean by more than the limits shown in Table 1, the new mean value for that property is then designated the assigned maximum dry density or assigned optimum moisture content, as appropriate. NOTES: 1When production is not continuous, it is desirable to obtain a sample and
20、determine its maximum dry density each time the assigned value is to be used as a monitoring check. 2If monitoring check sampling and testing have not been performed within the previous three months, the assigned values should not be used. If the latest six results do not meet the requirements of Ta
21、ble 1, the assigned values shall be discontinued until it can be demonstrated that the requirements of Table 1 can be satisfied by the testing of a further six samples. 6 TEST REPORT The following shall be reported: (a)The assigned value of maximum dry density, in tonnes per cubic metre, to the near
22、est 0.01. (b)The assigned value of optimum moisture content, in percent, to the nearest 0.5. (c)The source and description of the material. (d)The date the values were assigned. (e)The compactive effort (modified or standard) to which the assigned values relate. (f)Reference to this test method, i.e
23、., AS 1289.5.4.2. NOTES: 1Control charts of the assigned values and results from individual monitoring samples may be plotted to assess whether there is drift in the values being used, in which case, new values may need to be assigned. 2When field density test sites are subject to retest, the user s
24、hould check that the assigned values for the material have not changed due to further working by following the procedure in Clause 4(e). Accessed by TAFE QUEENSLAND INSTITUTES on 04 Dec 2007 AS 1289.5.4.22007 4 This Australian Standard was prepared by Committee CE-009, Testing of Soils for Engineeri
25、ng Purposes. It was approved on behalf of the Council of Standards Australia on 20 June 2007 and published on 31 August 2007. The following are represented on Committee CE-009: AUSTROADS Association of Geotechnical Testing Authorities (QLD) Australian Building Codes Board Australian Chamber of Comme
26、rce and Industry Australian Geomechanics Society Australian Stabilisation Industry Association Cement Concrete and Aggregates AustraliaAggregates Department of Planning and Infrastructure (NT) Engineering and Construction Laboratories Association Engineers Australia National Association of Testing A
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30、onth. 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 mailstandards.org.au, or write to the Chief Executive, Standards Australia Limited, GPO Box 476, Sydn
31、ey, NSW 2001. Originated as AS 1289.5.4.21993. Second edition 2007. This Standard was issued in draft form for comment as DR 01092. 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
32、 photocopying, without the written permission of the publisher. Published by Standards Australia Limited GPO Box 476, Sydney, NSW 2001, Australia ISBN 0 7337 8364 3 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