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 978-0-626-21529-3 SANS 5840:2008Edition 2.2Any reference to SABS SM 840 is deemedto be a reference to this standard(Government Notice No. 1373 of 8
4、November 2002)SOUTH AFRICAN NATIONAL STANDARD Shell content of fine aggregate 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 5840:2008 Edition
5、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, and to delete a footnote. Foreword This South African standard was approved by National Committee StanSA SC 5120.61A, Cons
6、truction 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 840:2002 (edition 2.1). A vertical line in the margin shows where t
7、he text has been technically modified by amendment No. 2. SANS 5840:2008 Edition 2.2 1 Shell content of fine aggregate 1 Scope and field of application This standard specifies two methods primarily intended for determining the shell content of sea sand. The two methods are an ignition method and a s
8、olubility method. NOTE Although the methods provide for the elimination of organic material such as vegetable matter, the end result could be affected by the presence of other substances that decompose, oxidize or become volatile under the conditions specified in the methods. Examples of such substa
9、nces are sulfate and chlorine compounds and phosphates. The result will indicate the presence of any form of limestone. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this standard. All standards are subject to revisi
10、on 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 standard are encouraged to take steps to ensure the use of the most recent editions of the standards indicated below. Information on currently valid natio
11、nal and international standards can be obtained from Standards South Africa. SANS 197, Preparation of test samples of aggregates. SANS 3310-1/ISO 3310-1, Test sieves Technical requirements and testing Part 1: Test sieves of metal wire cloth. Amdt 1 3 Reagents 3.1 Hydrochloric acid, concentrated, ana
12、lytical reagent. 3.2 Silver nitrate solution, of concentration approximately 0,1 N. 4 Apparatus 4.1 Crucibles and lids, such as a platinum crucible with lid. The use of crucibles of materials such as silica or quartz could cause the crucible and contents to fuse at the temperature specified in 5.1.4
13、, rendering the crucible unsuitable for further use. 4.2 Filter paper1) medium textured, quantitative filter paper. Amdt 2 1) Whatman No. 40 or equivalent. Amdt 2 SANS 5840:2008 Edition 2.2 2 4.3 Test sieves, of aperture sizes 600 m and 150 m and that comply with the requirements of SANS 3310-1. Amd
14、t 1 5 Ignition method 5.1 Procedure 5.1.1 Ignite a crucible with a lid, cool to room temperature in a desiccator, and determine the mass of the crucible with lid to the nearest 0,01 g (mass a). 5.1.2 From the test sample (see SANS 197), take a test specimen of approximately 10 g, place it in the cru
15、cible and dry it to constant mass at a temperature of 100 C to 110 C. Cool to room temperature in a desiccator, and determine the mass of the crucible, with contents and lid, to the nearest 0,01 g (mass b). 5.1.3 Ignite the crucible with the test specimen, but without the lid, for 1 h at a temperatu
16、re of 550 C to 600 C. Transfer the crucible, with contents, to a desiccator, replace the lid and cool the whole to room temperature, but for a period not exceeding 2 h. Determine the mass of the crucible, lid and contents to the nearest 0,01 g (mass c). 5.1.4 Ignite the crucible with the test specim
17、en, but without the lid, for 1 h at a temperature of 950 C to 1 000 C. Transfer the crucible, with contents, to the desiccator, replace the lid and cool the whole to room temperature, but for a period not exceeding 2 h. Determine the mass of the crucible, lid and contents to the nearest 0,01 g (mass
18、 d ). 5.2 Expression and reporting of results Calculate the shell content of the fine aggregate to the nearest 0,1 %, as follows: ( ) 2,274100cdbawhere a is the mass of the crucible and lid, in grams (see 5.1.1); b is the mass of the crucible, lid, and test specimen, in grams (see 5.1.2); c is the m
19、ass of the crucible, lid, and test specimen after initial ignition, in grams (see 5.1.3); and d is the mass of the crucible, lid, and test specimen after final ignition, in grams (see 5.1.4). Report the shell content of the fine aggregate to the nearest 0,1 %. 6 Solubility method 6.1 Procedure 6.1.1
20、 Take a sample of the aggregate of approximately 100 g (see SANS 197), and so crush and mill it that the whole of the sample passes the 600 m sieve. Reduce the sample by means of a sample splitter, or by coning and quartering, to obtain a representative portion of approximately 25 g. Further mill th
21、is portion until it all passes a sieve of aperture size 150 m. SANS 5840:2008 Edition 2.2 3 6.1.2 From the material prepared in accordance with 6.1.1, take a test specimen of approximately 10 g and follow the procedures described in 5.1.1 to 5.1.3. 6.1.3 Wash the test specimen with distilled or deio
22、nized water and pour all the material from the crucible into a 1 mL beaker, add water to make up to a volume of approximately 400 mL and stir well. 6.1.4 Add 100 mL of hydrochloric acid to the contents of the beaker and once again stir well. Heat, breaking up any conglomerated material present, and
23、then boil gently for 10 min while maintaining constant volume. 6.1.5 Filter the contents of a beaker through a medium textured quantitative filter paper (see 4.2), rinse the beaker with hot water, and finally wash the residue with hot water until the wash water is free from chlorides (i.e. free from
24、 cloudiness when tested with the silver nitrate). 6.1.6 Place the paper with the residue in the previously ignited and tared crucible with a lid (mass e) and carefully char the paper without allowing it to flame. Ignite the crucible, with contents but without the lid, for 1 h at a temperature of 950
25、 C to 1 000 C. Transfer the crucible, with contents, to a desiccator, replace the lid and cool the whole to room temperature. Determine the mass of the crucible, lid and contents to the nearest 0,01 g (mass f ). 6.1.7 Conduct a blank determination, using a previously ignited and tared crucible with
26、a lid (mass g), following the procedures described in 6.1.4 to 6.1.6 (i.e. excluding the test sample) and using the same quantities of reagents. Determine the mass of the crucible, contents and lid, to the nearest 0,01 g (mass h). 6.2 Expression and reporting of results Calculate the shell content o
27、f the fine aggregate to the nearest 0,1 %, as follows: ()( )100 100fe hgbawhere f e is the mass of the residue, in grams (see 6.1.6); h g is the mass of the residue found in the blank determination, in grams (see 6.1.7); and b a is the mass of the test sample, in grams (see 5.1.2 and 5.1.1). Report the shell content of the fine aggregate to the nearest 0,1 %. Standards South Africa
