BS 812 .PDF


BS - - Download as PDF File .pdf), Text File .txt) or read online. No 4 - BS Section - Flakiness Index. Aggregate Crushing Value BS and BS en BS Part - Methods for Determination of Particle Size Distribution. BS Part BS Part BS Section BS British Standards can be obtained in PDF or hard copy formats from the.

Bs 812 .pdf

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BRITISH STANDARD. BS Testing aggregates —. Part Methods for determination of particle shape —. Section Flakiness index. BS Part BS Part BS ○ European Standards adopted as British Standards (BS EN). BS EN download your copy of BS as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards available.

The sample used for the test the laboratory sample shall be taken in accordance with the procedures described in clause 5 of BS Dry the test portions by heating at a accurate to 0.

Allow to cool, weigh and record as M1. Mount the sieves 63 50 in such a way that the suspension passing the test 50 35 sieve can be run to waste or, when required, collected in a suitable vessel. Remove excess free hoggin, the particle size distribution may result in water by careful decantation through the test sieve, excess mass on one or more sieves particularly on avoiding transfer of solids see note 2 and dry the the finer sizes.

Cool, weigh and record as M2. NOTE 2 If some transfer of solids does occur wash them back a Subdivide the test portion into two or more into the tray and repeat the operation.


Determine the particle size NOTE 3 Fine sieves are fragile and the integrity of the mesh distribution for each portion and combine the should be checked frequently see appendix B. Weigh the retained 7.

Determine the particle size receiver in order of increasing aperture size from distribution of each fraction separately, reducing bottom to top. Place the dried residue on the top where necessary by quartering or by means of a coarsest sieve and cover with a fitting lid.

Licensed Copy: Mr. Type Camlab Ltd, Cambridge.

No 11 - BS - Part - Determine Water Soluble Chloride Salts

Weigh 2 kg of water into the bucket. Stir the materials in the bucket intermittently for at least 15 min for fine aggregate or 10 h for coarse or mixed aggregate.

Agitate the contents intermittently for 4 h, allow to settle and then pour some of the supernatant solution into the beaker or plastics drinking cup A. NOTE 1 One hour extraction can be used for the coarse or mixed aggregate provided the relationship between chloride extracted at 1 h and 10 h is known and can be allowed for.

NOTE 2 These shorter extraction times may result in lower chloride contents than the standard test. Acidify with the nitric acid A.


If no turbidity is apparent after 10 min the chloride ion content of the aggregate is negligible. Appendix B Field tests for determination of chloride ions B.

If this is not available, it is necessary to measure the chloride content of the water by making a determination of the water alone by the procedure described in 9. When the required extraction time is complete, allow the aggregate to settle and remove some of the supernatant extraction liquid into a beaker or cup.

It is therefore necessary to incorporate a 75 m test sieve in the series of test sieves used to sieve the dried BS or BS When published, it will supersede 7. When sieving is done by hand percentage of the original dry mass M1 , For the alone start with the coarsest sieve and shake each mass of material passing the finest sieve, add that sieve separately over a clean tray or receiver until not more than a trace passes, but in any case for a passing during washing M1 M2 to that found period of not less than 2 min.

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Do the shaking with a during the dry sieving. Do not force materials through Estimates of the repeatability and reproducibility of the sieve by hand pressure but placing of particles is sieve analysis using the methods described in permitted.

Break lumps of agglomerated material this Section of BS are given in Table 4 for a which consist of particles representative of the bulk limited range of materials. NOTE 2 There is insufficient data available to permit the 7. When data is available it will be incorporated by break down into individual particles, such as clay amendment.

Some values of Vs for a single experiment are given lumps, and remove from the sieve for separate in Supplementary Report published by the Transport and Road Research Laboratory. Light The report shall affirm that the particle size brushing with a soft brush on the underside of the distribution was determined in accordance with this sieve may be used to clear sieve openings.

Light Section of BS and whether or not a certificate of brushing with a fine camel-hair brush may be used sampling is available.

If available, a copy of the on the m and 75 m sieves to prevent certificate of sampling shall be provided.Fill the container to overflowing, volume, as a percentage of original volume, of a tamp it again with the same number of blows, and mass of fine aggregate whose moisture content is remove the surplus aggregate by rolling the tamping increased from the oven-dry condition to a test rod across and in contact with the top of the moisture content. By Prashant C.

This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. ISA RP This has been done because some aggregates have a significantly reduced resistance to crushing when tested in this condition.

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