SANS 5847-2008 Flakiness index of coarse aggregates《粗骨料的片状指数》.pdf

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1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21744-0 SANS 5847:2008Edition 2.2Any reference to SABS SM 847 is deemedto be a reference to this standard(Government Notice No. 1373 of 8

4、November 2002)SOUTH AFRICAN NATIONAL STANDARD Flakiness index of course aggregates Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 5847:2008 Edi

5、tion 2.2 Table of changes Change No. Date Scope Amdt 1 2002 Amended to update normative references. Amdt 2 2008 Amended to change the designation of SABS standards to SANS standards, with no technical changes. Foreword This South African standard was approved by National Committee StanSA SC 5120.61A

6、, Construction standards Cement, lime and concrete, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This document was published in August 2008. This document supersedes SABS SM 847:2002 (edition 2.1). SANS 5847:2008 Edition 2.2 1 Contents

7、 Page Foreword 1 Scope and field application 3 2 Normative references . 3 3 Apparatus . 3 4 Procedure . 4 5 Expression and reporting of results 5 SANS 5847:2008 Edition 2.2 2 This page is intentionally left blank SANS 5847:2008 Edition 2.2 3 Flakiness index of coarse aggregates 1 Scope and field of

8、application This standard specifies a method for determining the flakiness index of coarse aggregate that passes a sieve of aperture size 75 mm and that is retained on a sieve of aperture size 4 750 m. NOTE The flakiness index is a measure of the flatness of an aggregate, which has an effect on most

9、 of its uses in the construction industry. The flakiness index is the mass of particles in the aggregate (expressed as a percentage of the total mass of the aggregate test sample) that will pass slots of specified width for the appropriate size fraction of the aggregate. 2 Normative references The f

10、ollowing standards contain provisions which, through reference in this text, constitute provisions of this standard. All standards are subject to revision and, since any reference to a standard is deemed to be a reference to the latest edition of that standard, parties to agreements based on this st

11、andard are encouraged to take steps to ensure the use of the most recent editions of the standards indicated below. Information on currently valid national and international standards can be obtained from Standards South Africa. SANS 3310-1/ISO 3310-1, Test sieves Technical requirements and testing

12、Part 1: Test sieves of metal wire cloth. Amdt 1 SANS 3310-2/ISO 3310-2, Test sieves Technical requirements and testing Part 2: Test sieves of perforated metal cloth. Amdt 1 SANS 197, Preparation of test samples of aggregates. SANS 201, Sieve analysis, fine content and dust content of aggregates. 3 A

13、pparatus 3.1 Flakiness gauge, of metal (and of any suitable form), of nominal thickness 1,6 mm, and that has at least one slot for each fraction to be tested. The slots are rectangular and their dimensions conform to the relevant values given in columns 3 and 4 of table 1. 3.2 Test sieves, of apertu

14、re sizes as given in columns 1 and 2 of table 1, and that comply with the requirements of SANS 3310-1 or SANS 3310-2. Amdt 1 SANS 5847:2008 Edition 2.2 4 Table 1 Slot dimensions, size and mass of fractions 1 2 3 4 5 Fraction size to be gauged mm Slot dimensions Minimum length Width Minimum mass of s

15、pecimen to be gauged Passing Retained mm mm1)g 75,0 63,0 53,0 63,0 53,0 37,5 150,0 126,0 106,0 37,5 31,5 26,5 35 000 20 000 7 500 37,5 26,5 19,0 26,5 19,0 13,2 75,0 53,0 38,0 18,75 13,25 9,5 2 500 1 000 500 13,2 9,5 6,7 9,5 6,7 4,75 26,4 19,0 13,4 6,6 4,75 3,35 120 50 20 1) Subject to a tolerance of

16、 0,10 mm. 4 Procedure 4.1 From the sample to be tested (see SANS 197), weigh out a test specimen of such quantity that, for each fraction size to be gauged, the minimum mass prescribed in column 5 of table 1 will be available. The test specimen should be weighed out to the nearest 0,1 % of its mass

17、(basing the size of portions to be gauged on the actual fraction sizes present in the test sample). 4.2 Carry out a grading analysis in accordance with SANS 201, separating the aggregate into the relevant fraction sizes given in table 1 and discarding fraction sizes that constitute less than 10 % of

18、 the total mass of the test specimen. Record, to the nearest 0,1 %, the percentage (a), retained on each sieve. 4.3 From the fraction sizes separated in the grading analysis, take at least the minimum mass specified in column 5 of table 1 for each fraction size. Determine, to an accuracy of 0,2 % of

19、 its mass, the mass of each fraction to be gauged. 4.4 Gauge pieces in each fraction size (using the corresponding slot given in table 1), and determine the mass, to the same accuracy, of each quantity that passes through the appropriate individual slots. SANS 5847:2008 Edition 2.2 5 5 Expression an

20、d reporting of results 5.1 Calculate, to the nearest 0,1 %, the percentage (b) of each fraction size that passes through the individual slots. 5.2 Calculate (for each fraction size) the product (a b) as a percentage and report, rounded-off to the nearest whole number, the sum of these products as th

21、e flakiness index of the aggregate. (An example of the calculation of the flakiness index is given in table 2.) Table 2 Example of a calculation 1 2 3 4 Sieve size mm Individual percentage retained a Percentages passing slots b Flakiness index 100x ba26,5 19,0 13,2 13,9 75,2 11,6 25,8 32,4 36,5 3,6 24,4 4,2 32,21)1) Report the flakiness index as 32. Standards South Africa