AS 2758.7—1996

Australian Standard

Aggregates and rock forengineering purposes

Part 7: Railway ballast

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This Australian Standard was prepared by Committee CE/12, Aggregates and Rock forEngineering Purposes. It was approved on behalf of the Council of Standards Australiaon 30 August 1996 and published on 5 October 1996.

The following interests are represented on Committee CE/12:

Australasian Railway Association

Australasian Slag Association

Australian Asphalt Pavement Association

Australian Geomechanics Society

Australian Premixed Concrete Association

Australian Stone Industry Association

AUSTROADS

Bureau of Steel Manufacturers of Australia

Cement and Concrete Association of Australia

Crushed Stone Association of Australia

Crushed Stone Association (Qld)

CSIRO —Division of Building, Construction and Engineering

Institute of Municipal Engineering Australia, New South Wales Division

Monash University

National Association of Testing Authorities Australia

National Public Works Council

Quarry Masters Association of New South Wales

Review of Australian Standards.To keep abreast of progress in industry, Australian Standards are subjectto periodic review and are kept up to date by the issue of amendments or new edit ions as necessary. It isimportant therefore that Standards users ensure that they are in possession of the latest edit ion, and anyamendments thereto.Full details of all Australian Standards and related publications wil l be found in the Standards AustraliaCatalogue of Publications; this information is supplemented each month by the magazine ‘The AustralianStandard’, which subscribing members receive, and which gives details of new publications, new editi onsand amendments, and of withdrawn Standards.Suggestions for improvements to Australian Standards, addressed to the head office of Standards Australia,are welcomed. Notification of any inaccuracy or ambiguity found in an Australian Standard should be madewithout delay in order that the matter may be investigated and appropriate action taken.

This Standard was issued in draft form for comment as DR 95015.

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AS 2758.7—1996

Australian Standard

Aggregates and rock forengineering purposes

Part 7: Railway ballast

PUBLISHED BY STANDARDS AUSTRALIA(STANDARDS ASSOCIATION OF AUSTRALIA)1 THE CRESCENT, HOMEBUSH, NSW 2140

ISBN 0 7337 0742 4

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AS 2758.7 — 1996 2

PREFACE

This Standard was prepared by Standards Australia Committee CE/12 on Aggregates andRock for Engineering Purposes.

This Standard is Part 7 of the AS 2758 series of Standards which covers the specification ofrocks and aggregates for engineering purposes. The other Parts are as follows:

Part 1: Concrete aggregatesPart 2: Aggregate for sprayed bituminous surfacingPart 5: Asphalt aggregates

The objective of this Standard is to provide a basis for specifying requirements for the supplyof aggregates intended for use as railway ballast.

This Standard covers a new area of specification for Australian Standards and in view ofregional differences in environment, materials and practice, provision has been made to allow,in the works specification, changes to some limits and procedures.

Track classifications defined in this Standard are based on the distribution of track usage asset out in the Railways of Australia publicationClassification of Railways(1979), andacknowledgment is made of the assistance received from this source.

The term ‘informative’ has been used in this Standard to define the application of theappendix to which it applies. An ‘informative’ appendix is for information and guidance only.

Copyright STANDARDS AUSTRALIA

Users of Standards are reminded that copyright subsists in all Standards Australia publications and software. Except where theCopyright Act allows and except where provided for below no publications or software produced by Standards Australia may bereproduced, stored in a retr ieval system in any form or transmitted by any means without prior permission in writ ing fromStandards Australia. Permission may be conditional on an appropriate royalty payment. Requests for permission and information oncommercial software royalties should be directed to the head off ice of Standards Australia.

Standards Australia will permit up to 10 percent of the technical content pages of a Standard to be copied for use exclusivelyin-house by purchasers of the Standard without payment of a royalty or advice to Standards Australia.

Standards Australia wil l also permit the inclusion of its copyright material in computer software programs for no royaltypayment provided such programs are used exclusively in-house by the creators of the programs.

Care should be taken to ensure that material used is from the current edit ion of the Standard and that it is updated whenever theStandard is amended or revised. The number and date of the Standard should therefore be clearly identif ied.

The use of material in print form or in computer software programs to be used commercially, with or without payment, or incommercial contracts is subject to the payment of a royalty. This policy may be varied by Standards Australia at any time.

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3 AS 2758.7 — 1996

CONTENTS

Page

1 SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 REFERENCED DOCUMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 TRACK CLASSIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 SAMPLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 GENERAL REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 DIMENSIONAL REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

10 DURABILITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

APPENDICESA GUIDANCE ON TYPICAL SAMPLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8B TERMINOLOGY AND CLASSIFICATION (PETROLOGICAL) . . . . . . . . . . . . . 9

First published as AS 2758.7— 1996.

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AS 2758.7 — 1996 4

STANDARDS AUSTRALIA

Australian Standard

Aggregates and rock for engineering purposes

Part 7: Railway ballast

1 SCOPE This Standard provides a basis for specifying requirements for the supply ofaggregates intended for use as railway ballast.

2 APPLICATION While a number of the requirements nominated in this Standard arebasic, the specifier shall make a selection from the options available in this Standard, or fromalternative test methods and limits (which may be from Australian Standards or otherappropriate Standards).

The basic requirements for all ballast aggregates are prescribed in Clauses 8 to 10 of thisStandard. Alternatives are provided for the assessment of durability. However, not more thanone of these alternatives shall be specified.

The selection of test procedures and test limits where alternatives are provided, and thefrequency at which individual tests are required, shall be determined by the individual worksspecification.

The works specification should specify all the tests appropriate to the source rock or thetender samples, or both, but the whole range of tests is not necessarily applied to controlacceptance of the product during the performance of a contract.

For contractual purposes it is the works specification which is binding.

However, the case may arise where a contract document uses terms such as ‘materialcomplying with AS 2758.7’ without providing a works specification. In this event thesupplier shall attempt to obtain further details from the purchaser. In the absence of a worksspecification, material will be deemed to comply with AS 2758.7 if the supplier operates aquality system certified to AS/NZS ISO 9002 and can provide test data from a laboratoryaccredited to ISO Guide 25 showing that the material to be supplied fulfils the Class Nrequirements of this Standard.

3 REFERENCED DOCUMENTS The following documents are referred to in thisStandard:

AS1141 Methods for sampling and testing aggregates1141.3.1 Method 3.1: Sampling of aggregates1141.4 Method 4: Bulk density of aggregate1141.6.1 Method 6.1: Particle density and water absorption of coarse aggregate—

Weighing-in-water method1141.11 Method 11: Particle size distribution by dry sieving1141.12 Method 12: Materials finer than 75µm in aggregates (by washing)1141.14 Method 14: Particle shape, by proportional calliper1141.18 Method 18: Crushed particles of coarse aggregate1141.21 Method 21: Aggregate crushing value1141.22 Method 22: Wet/dry strength variation1141.23 Method 23: Los Angeles value1141.27 Method 27: Resistance to wear by attrition

COPYRIGHT

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