DJS 112: Part 2: 2015 ICS 93.080.20

DRAFT

Jamaican Standard

Methods

for

Sampling and testing of mineral aggregates, sands and fillers – Part 2: Reducing samples of aggregate to testing size

Notice

This is a draft standard and shall not be used or referenced as a Jamaican Standard.

This draft is subject to change without notice. Recipients of this draft are invited to

submit their comments during the designated public comment period.

BUREAU OF STANDARDS JAMAICA

Bureau of Standards Jamaica 6 Winchester Road P.O. Box 113 Kingston 10 Jamaica, WI Tel: 876 632 4275 or 876 619 1131 Fax: 876 929 4736 E-mail: info@bsj.org.jm Month 20XX

COMMENT DEADLINE: 05 OCTOBER 2015

IMPORTANT NOTICE

Jamaican standards are subjected to periodic review. The next amendment will be sent without charge if you cut

along the dotted line and return the self-addressed label. If we do not receive this label we have no record that

you wish to be kept up-to-date. Our address:

Bureau of Standards Jamaica

6 Winchester Road

P.O. Box 113

Kingston 10

Jamaica W.I.

---------------------------("cut along the line)------------------------------------------------------------------------------------------

JS 112: Part 2: 20XX

NAME OR DESIGNATION………………………………………………….………………………………......

ADDRESS……………………………………………………………………….………….……………………….……………………………………….…………………………………………………………………………………...............................................................................……………………………………………………

DJS 112: Part 2: 2015

iii

JBS CERTIFICATION MARK PROGRAMME

The general policies of the JBS Certification Mark Programme are as follows:

- The JBS provides certification services for manufacturers participating in the programme and licensed to use the gazetted JBS Certification Marks to indicate conformity with Jamaican Standards.

- Where feasible, programmes will be developed to meet special requirements of the submitter. Where applicable, certification may form the basis for acceptance by inspection authorities responsible for enforcement of regulations.

- In performing its functions in accordance with its policies, JBS will not assume or undertake any responsibility of the manufacturer or any other party.

Participants in the programme should note that in the event of failure to resolve an issue arising from interpretation of requirements, there is a formal appeal procedure.

Further information concerning the details of the JBS Certification Mark Programme may be obtained from the Bureau of Standards Jamaica, 6 Winchester Road, Kingston 10.

CERTIFICATION MARKS

Product Certification Marks Plant Certification Mark

Certification of Agricultural Produce Jamaica-Made Mark (JMM)

(CAP) Mark

DJS 112: Part 2: 2015

iv

© 20xx Bureau of Standards

All rights reserved. Unless otherwise specified, no part of a Bureau of Standards publication may be reproduced or

utilized in any form or by any means, electronic or mechanical, including, photocopying microfilm or scanning, without

permission in writing.

ISBN XXX XXX XXX XXX X

Declared by the Bureau of Standards to be a standard specification pursuant to section 7 of the Standards Act 1968.

First published Month 20XX

This standard was circulated in the draft form for comment under the reference DJS 112: Part 2: 2015.

Jamaican Standards establish requirements in relation to commodities, processes and practices, but do not purport to

include all the necessary provisions of a contract.

The attention of those using this standard specification is called to the necessity of complying with any relevant

legislation.

Amendments

No.

Date of Issue

Remarks

Entered by and date

DJS 112: Part 2: 2015

v

Contents Page

Foreword ............................................................................................................................................................ vi

1 Scope ...................................................................................................................................................... 1

2 Normative references ............................................................................................................................ 1

3 Definitions .............................................................................................................................................. 1

4 Significance and Use ............................................................................................................................ 1

5 Selection of Method .............................................................................................................................. 2

5.1 Fine Aggregate ...................................................................................................................................... 2

5.2 Coarse Aggregates and Mixtures of Coarse and Fine Aggregates .................................................. 2

6 Sampling................................................................................................................................................. 2

Method A - Mechanical Splitter ......................................................................................................................... 2

7 Apparatus ............................................................................................................................................... 3

7.1 Sample Splitter ...................................................................................................................................... 3

8 Procedure ............................................................................................................................................... 3

Method B – Quartering ....................................................................................................................................... 4

9 Apparatus ............................................................................................................................................... 4

10 Procedure ............................................................................................................................................... 4

Method C – Miniature Stockpile Sampling (Damp Fine Aggregate Only) ..................................................... 5

11 Apparatus ............................................................................................................................................... 5

12 Procedure ............................................................................................................................................... 5

DJS 112: Part 2: 2015

vi

Foreword

This standard has been prepared by the Jamaica Bureau of Standards' Aggregates Technical Committee. Metric dimensions are used throughout the standard as part of the national policy to change to the metric system.

The standard is one of twelve parts.

This part (Part 2) covers reducing samples of aggregate to testing size.

Part 1 covers sampling of aggregates.

Part 3 covers description and classification.

Part 4 covers particle size distribution.

Part 5 covers sedimentation

Part 6 covers particle shape

Part 7 covers clay lumps and friable particles

Part 8 covers moisture content

Part 9 covers soundness

Part 10 covers particle density and water absorption

Part 11 covers sand equivalent value

Part 12 covers liquid limit, plastic limit, and plasticity Index

Information on any other methods of tests that are thought suitable for extensive use, or suggestions for improvement of the specified methods are welcome and will be considered when will be considered when the standard becomes due for revision (5 years).

Committee representation

The revision of this standard for the Standards Council, established by the Standards Act 1968 was carried out under the supervision of the Bureau’s Aggregates Technical Committee which at the time comprised the following members:

Acknowledgement

Acknowledgement is made to the following institution for permission to reproduce material from the related documents outlined below.

American Society for Testing and Materials (ASTM)

DJS 112: Part 2: 2015

vii

Related documents

This standard makes reference to the following:

ASTM C125 Standard Terminology Relating to Concrete and Concrete Aggregates

ASTM C128 Standard Test Method for Relative Density (Specific Gravity) and Absorption of Fine Aggregate

ASTM C702 Standard Practice for Reducing Samples of Aggregate to Testing Size

JS 112: Part 1 Methods for sampling and testing of mineral aggregates, sands and fillers — Part 1: Sampling of aggregates

DJS 112: Part 2: 2015

1

Draft Jamaican Standard Methods for sampling and testing of mineral aggregates, sands and fillers – Part 2: Reducing samples of aggregate to testing size

1 Scope

1.1 This practice covers three methods for the reduction of large samples of aggregate to the appropriate size for testing employing techniques that are intended to minimize variations in measured characteristics between the test samples so selected and the large sample.

1.2 The values stated in this standard are SI units.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ASTM C125, Standard Terminology Relating to Concrete and Concrete Aggregates

ASTM C128, Standard Test Method for Relative Density (Specific Gravity) and Absorption of Fine Aggregate

JS 112, Methods for sampling and testing of mMineral aggregates, sands and fillers - Part 1: Sampling of aggregates

3 Definitions

The terms used in this practice are defined in ASTM C125 .

4 Significance and Use

4.1 Specifications for aggregates require sampling portions of the material for testing. Other factors being equal, larger samples will tend to be more representative of the total supply. This practice provides procedures for reducing the large sample obtained in the field or produced in the laboratory to a convenient size for conducting a number of tests to describe the material and measure its quality in a manner that the smaller test sample portion is most likely to be a representation of the larger sample, and thus of the total supply. Failure to carefully follow the procedures in this practice could result in providing a non-representative sample to be used in subsequent testing. The individual test methods provide for minimum amount of material to be tested.

4.2 Under certain circumstances, reduction in size of the large sample prior to testing is not recommended. Substantial differences between the selected test samples sometimes cannot be avoided, as for example, in

2

the case of an aggregate having relatively few large size particles in the sample. The laws of chance dictate that these few particles may be unequally distributed among the reduced size test samples. Similarly, if the test sample is being examined for certain contaminants occurring as a few discrete fragments in only small percentages, caution should be used in interpreting results from the reduced size test sample. Chance inclusion or exclusion of only one or two particles in the selected test sample may importantly influence interpretation of the characteristics of the original sample. In these cases, the entire original sample should be tested.

5 Selection of Method

5.1 Fine Aggregate

Reduce the size of samples of fine aggregate that are drier than the saturatedsurfacedry condition.

NOTE Using a mechanical splitter according to Method A. Reduce the size of samples having free moisture on the particle surfaces by quartering according to Method B, or by treating as a miniature stockpile as described in Method C.

5.1.1 If the use of Method B or Method C is desired, and the sample does not have free moisture on the particle surfaces, moisten the sample to obtain free moisture on the particle surfaces, mix thoroughly, and then reduce the sample size.

5.1.2 If use of Method A is desired and the sample has free moisture on the particle surfaces, dry the entire sample to at least the saturatedsurfacedry condition, using temperatures that do not exceed those specified for any of the tests contemplated, and then reduce the sample size. Alternatively, if the moist sample is very large, make a preliminary split using a mechanical splitter having chute openings of 38 mm or more in width to reduce the sample to not less than 5 kg. Dry the portion so obtained, and reduce it to test sample size using Method A.

NOTE The method of determining the saturatedsurfacedry condition is described in Test Method ASTM C128. As a quick approximation, if the fine aggregate will retain its shape when molded in the hand, it may be considered to be wetter than saturated surface dry.

5.2 Coarse Aggregates and Mixtures of Coarse and Fine Aggregates

Reduce the sample using a mechanical splitter in accordance with Method A (preferred method) or by quartering in accordance with Method B. The miniature stockpile Method C is not permitted for coarse aggregates or mixtures of coarse and fine aggregates.

6 Sampling

Obtain samples of aggregate in the field in accordance with JS 112 Part 1, or as required by individual test methods. When tests for sieve analysis only are contemplated, the size of the field sample listed in JS 112 Part 1 is usually adequate. When additional tests are to be conducted, the user shall be satisfied that the initial size of the field sample is adequate to accomplish all intended tests. Use similar procedures for aggregate produced in the laboratory.

Method A – Mechanical Splitter

3

7 Apparatus

7.1 Sample Splitter

Sample splitters shall have an even number of equal width chutes, but not less than a total of eight for coarse aggregate, or twelve for fine aggregate, which discharge alternately to each side of the splitter. For coarse aggregate and mixed aggregate, the minimum width of the individual chutes shall be approximately 50 % larger than the largest particles in the sample to be split.

NOTE For dry fine aggregate in which the entire sample will pass the 9.5-mm seive, a splitter having chutes 12.5 to 20 mm wide shall be used. The splitter shall be equipped with two receptacles to hold the two halves of the sample following splitting. It shall also be equipped with a hopper or straight edged pan which has a width equal to or slightly less than the over-all width of the assembly of chutes, by which the sample may be fed at a controlled rate to the chutes. The splitter and accessory equipment shall be so designed that the sample will flow smoothly without restriction or loss of material (see Fig. 1 and Fig. 2).

NOTE Mechanical splitters are commonly available in sizes adequate for coarse aggregate having the largest particle

not over 37.5 mm.

8 Procedure

Place the original sample in the hopper or pan and uniformly distribute it from edge to edge, so that when it is introduced into the chutes, approximately equal amounts will flow through each chute. Introduce the sample at a rate so as to allow it to flow freely through the chutes and into the receptacles below. Reintroduce the portion of the sample in one of the receptacles into the splitter as many times as necessary to reduce the sample to the size specified for the intended test. Reserve the portion of material collected in the other receptacle for reduction in size for other tests, when required.

Figure 1 — Large sample splitter for coarse aggregate

4

Figure 2 — Sample splitters (Riffles)

NOTE Small Sample Splitters for Fine Aggregate. May be constructed as either closed or open type. Closed type is preferred.

Method B – Quartering

9 Apparatus

Apparatus shall consist of a straight-edged scoop, shovel, or trowel; a broom or brush; and a canvas blanket approximately 2 by 2.5 m.

10 Procedure

10.1 Use either the procedure described in 9.1.1 or 9.1.2 or a combination of both.

10.1.1 Place the original sample on a hard, clean, level surface where there will be neither loss of material nor the accidental addition of foreign material. Mix the material thoroughly by turning the entire sample over three times. With the last turning, shovel the entire sample into a conical pile by depositing each shovelful on top of the preceding one. Care-fully flatten the conical pile to a uniform thickness and diameter by pressing down the apex with a shovel so that each quarter sector of the resulting pile will contain the material originally in it. The diameter should be approximately four to eight times the thickness. Divide the flattened mass into four equal quarters with a shovel or trowel and remove two diagonally opposite quarters, including all fine material, and brush the cleared spaces clean. Successively mix and quarter the remaining material until the sample is reduced to the desired size (Fig. 3).

5

Cone Sample on Hard Clean Surface Mix by Forming New Cone Quarter After Flattening Cone

Sample Divided into Quarters Retain Opposite Quarters

Reject the Other Two Quarters

Figure 3 — Quartering on a hard, clean level surface

10.1.2 As an alternative to the procedure described in Clause 9.1.1, when the floor surface is uneven, place the field sample on a canvas blanket and mix with a shovel as described in Clause 9.1.1, or by alternately lifting each corner of the canvas and pulling it over the sample toward the diagonally opposite corner causing the material to be rolled. Flatten the pile as described in Clause 9.1.1. Divide the sample as described in 9.1.1, or if the surface beneath the blanket is uneven, insert a stick or pipe beneath the blanket and under the center of the pile, then lift both ends of the stick, dividing the sample into two equal parts. Remove the stick leaving a fold of the blanket between the divided portions. Insert the stick under the center of the pile at right angles to the first division and again lift both ends of the stick, dividing the sample into four equal parts. Remove two diagonally opposite quarters, being careful to clean the fines from the blanket. Successively mix and quarter the remaining material until the sample is reduced to the desired size (Fig. 4).

Method C – Miniature Stockpile Sampling (Damp Fine Aggregate Only)

11 Apparatus

Apparatus shall consist of a straight-edged scoop, shovel, or trowel for mixing the aggregate, and either a small sampling thief, small scoop, or spoon for sampling.

12 Procedure

Place the original sample of damp fine aggregate on a hard clean, level surface where there will be neither loss of material nor the accidental addition of foreign material. Mix the material thoroughly by turning the entire sample over three times. With the last turning, shovel the entire sample into a conical pile by depositing each shovelful on top of the preceding one. If desired, flatten the conical pile to a uniform thickness and diameter by pressing down the apex with a shovel so that each quarter sector of the resulting pile will contain the material originally in it. Obtain a sample for each test by selecting at least five increments of material at random locations from the miniature stockpile, using any of the sampling devices described in Clause 11.

6

Figure 4 — Quartering on a canvas blanket

7

Standards Council

The Standards Council is the controlling body of the Bureau of Standards and is responsible for the policy and general

administration of the Bureau.

The Council is appointed by the Minister in the manner provided for in the Standards Act, 1968. Using its powers in the

Standards Act, the Council appoints committees for specified purposes.

The Standard Act, 1968 sets out the duties of the Council and the steps to be followed for the formulation of a standard.

Preparation of standards documents

The following is an outline of the procedure which must be followed in the preparation of documents:

a) The preparation of standards documents is undertaken upon the Standards Council’s authorization. This may arise

out of representations from national organisations or existing Bureau of Standards’ Committees or Bureau’s staff. If

the project is approved it is referred to the appropriate sectional committee or if none exists a new committee is

formed or the project is assigned to a Bureau staff.

b) If necessary, when the final draft of a standard is ready, the Council authorizes an approach to the Minister in order to

obtain the formal concurrence of any other Minister who may be responsible for any area which the standard may

affect.

c) With the approval of the Standards Council, the draft document is made available for general public comments. All

interested parties, by means of a notice in the Press, are invited to comment. In addition, copies are forwarded to

those known, interested in the subject.

d) The committee considers all the comments received and recommends a final document to the Standards Council.

e) The Standards Council recommends the document to the Minister for publication.

f) The Minister approves the recommendation of the Standards Council.

g) The declaration of the standard is gazzetted and copies placed on sale.

h) On the recommendation of the Standards Council the Minister may declare a standard to be compulsory.

i) Amendments to and revisions of standards normally require the same procedure as is applied to the preparation of

the original standard.

Overseas Standards documents

The Bureau of Standards maintains a reference library which includes the standards of many overseas standard

organizations. These standards can be inspected upon request.

The Bureau can supply on demand copies of standards produced by some national standards and is the agency for the

sale of standards produced by International Organisation for Standardization (ISO) members.

Application to use the reference library and to purchase Jamaican and other standard documents should be addressed to:

Bureau of Standards 6 Winchester Road, P.O. Box 113, Kingston 10, Jamaica, W.I.