1、BRITISH STANDARD BS 4550-6: 1978 Methods of testing cement Part 6: Standard sand for mortar cubes IMPORTANT NOTE. It is recommended that this Part be read in conjunction with the information in Part 0 “General Introduction” to BS4550, which is issued separately UDC 666.94.01:666.971.12BS4550-6:1978
2、This British Standard, having been prepared under the directionof the Cement, Gypsum,Aggregates and QuarryProducts Standards Committee, was published underthe authority ofthe Executive Board on 30 June 1978 BSI 07-1999 The following BSI references relate to the work on this standard: Committee refer
3、ence CAB/1 Draft for comment 73/10751 DC ISBN 0 580 10153 3 Foreword This British Standard has been prepared under the direction of the Cement, Gypsum, Aggregates and Quarry Products Standards Committee. It brings together and revises the specification for standard sand for mortar cubes described in
4、 the appendices of the following British Standards. BS 12-2:1971, Portland cement (ordinary and rapid-hardening). BS 915-2:1972, High alumina cement. BS 4248:1974, Supersulphated cement. Part 0 of BS 4550 is a general introduction; Part 1 lays down methods of sampling cement; Part 2 describes method
5、s of chemical testing of cement; Part3 describes methods of physical testing of cement; Part 4 specifies the standard coarse aggregate for concrete cubes and Part 5 specifies the standard sand for concrete cubes. Publication of BS 4550 enables the standards listed in the previous paragraph and BS 14
6、6-2:1973 “Portland-blastfurnace cement”, BS1370-2:1974 “Low heat Portland cement”, BS 4027-2:1972 “Sulphate-resisting Portland cement” and BS 4246-2:1974 “Low heat Portland-blastfurnace cement”, which cross refer to BS12-2:1971, to be revised by deletion of the relevant appendices. This will avoid r
7、epetition in the expanding range of cement standards and ensure that, if changes are made in any of the test methods or specifications, the standards remain in step. This Part of BS 4550 specifies the standard sand to be used in accordance with clause 2 “Compressive strength of mortar cubes”, of Sec
8、tion 3.4 “Strength tests” of BS 4550 “Methods of testing cement” Part 3 “Physical tests”. It is anticipated that the mortar cube test will be deleted at the first revision of BS 4550 “Methods of testing cement” Part 3: Physical tests. A British Standard does not purport to include all the necessary
9、provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and
10、2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue CommentsBS4550-6:1978 BSI 07-199
11、9 i Contents Page Foreword Inside front cover 1 Scope 1 2 References 1 3 Source 1 4 Sampling 1 5 Moisture content 1 6 Grading 1 7 Content of acid-soluble matter 1 8 Marking 1 Publications referred to Inside back coverii blankBS4550-6:1978 BSI 07-1999 1 1 Scope This Part of this British Standard spec
12、ifies the source, preparation and properties of a standard sand to be used for making mortar cubes. 2 References The titles of the publications referred to in this Part are listed on the inside back cover. 3 Source Natural (uncrushed) thoroughly washed and dried silica sand of the white variety shal
13、l be obtained from Leighton Buzzard, Bedfordshire. 4 Sampling Using a suitable scoop or similar device, a main sample of about 8 kg shall be taken from a single bag selected at random from a delivery not exceeding500kg. For the purposes of either of the tests specified in clauses 5 and 6, the main s
14、ample shall be reduced to about 500g by four passes through a sample divider. For the purpose of the test specified in clause 7, a sample of the specified size shall be taken from this reduced sample. 5 Moisture content The moisture content of the sample obtained as in clause 4 shall not exceed 0.1
15、% by dry mass when tested by the standard (oven drying) method in BS812-2. 6 Grading The sample of the sand, obtained as specified in clause 4, shall pass an 850 4m test sieve and the proportion by mass passing a 600 4m test sieve shall not exceed 10 % when determined by the normal test procedure fo
16、r sieve analysis given in BS 812-1. The test sieves shall be as specified in BS 410. 7 Content of acid-soluble matter The sand shall show a loss of mass not exceeding0.25 % on extraction with hot hydrochloric acid when determined by the following method. Dry a sample of a little over 2g of the sand
17、at a temperature of 105 5 C for a period of 1h. Weigh a quantity of approximately 2gof the dried sand to 0.001g into a porcelain dish and add 20ml of hydrochloric acid and 20ml of distilled water. Heat the dish on a water bath for 1h, filter the contents, and wash well with hot water. Dry the sand,
18、ignite it in a covered crucible, cool it and weigh it again. The loss in mass shall be expressed as a percentage of the original mass of the sample. 8 Marking The sand, processed in accordance with the requirements of this Part of this standard, shall be supplied in a suitable container marked with
19、the following particulars: a) the name, trade mark or other means of identification of the processor; b) the number of this British Standard, i.e. BS4550-6.2 blankBS4550-6:1978 BSI 07-1999 Publications referred to BS 410, Specification for test sieves. BS 812, Methods for sampling and testing of min
20、eral aggregates, sands and fillers. BS 812-1, Sampling, size, shape and classification. BS 812-2, Physical properties. BS 4550-6: 1978 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents
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