Buy BS EN TESTING FRESH CONCRETE – PART 1: SAMPLING from SAI Global. said in BS EN , take a few samples throughout the pour for the best representation of the batch and make sure you take % of what you think you’ll . This British Standard specifies two procedures for sampling fresh concrete which are implemented by composite sampling and by spot.
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BS EN – Testing fresh concrete. Sampling (British Standard)
What is the frequency of Sampling of Concrete? If the document is revised 12305-1 amended, you will be notified by email. Raise the mold carefully in a vertical direction with no lateral or torsional motion Raise the mold in 2 to 5 sec.
Scope This standard covers the determination of the temperature of freshly mixed hydraulic-cement concrete.
After this, the design mix specific to the particular type of structure recommends the discharge time limit waived against what is stated in the specifications. You may experience issues viewing this site in Internet Explorer 9, 10 or Notify me of new comments via email.
Compaction of the concrete The concrete shall be compacted immediately after placing in the moulds in such a way as to produce full compaction of the concrete with neither excessive segregation nor laitance. This European Standard specifies two procedures for sampling fresh concrete, by composite sampling and by spot sampling. The first school of thought is rather straightforward: Mechanical vibration using Compacting with an internal vibrator Apply the vibration for the minimum duration necessary to achieve full compaction of the concrete.
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Significance and Use The slump test was originally developed to provide a technique to monitor the consistency of unhardened concrete. Rod the second and 1250-1 layers throughout their depth, so that the strokes just penetrate into the immediately underlying layer.
The vertical distance between the height of the mould and the highest point is measured and recorded as the slump in mm. This standard is not included in any packages.
BS EN – Testing fresh concrete. Sampling – BSI British Standards
The time for this to occur depends on the concrete temperature, cement type, mix proportions, the use of admixtures with set retarding properties and consistency of the concrete. Subscription pricing is determined by: Subject the concrete to a sufficient number of strokes per layer, typically Apparatus Container, large enough to provide at least 75 mm of concrete in all directions around the sensor of the temperature measuring device, or at least three times the NMAS Nominal Maximum Aggregate Sizewhichever is greater.
Where required, the specification of a maximum time between placing layers of concrete should take account of the likely temperature of the concrete, cement type, mix proportions, the use of admixtures with set retarding properties and consistency of the concrete. Metallic, Frustum of a cone Alternative materials are allowed if requirements are met comparability tests Tamping Rod Round, straight steel rod, length mm and diameter 16mm Tamping end rounded to a hemispherical tip Measuring Device Ruler Marked in increments of 5 mm or smaller Length of at least mm In addition, a scoop is needed.
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BS EN 12350-1:2009
Mechanical vibration with vibrating table Apply the vibration for the minimum duration necessary to achieve full compaction of the concrete. Apparatus Mold Mold use for slump test of fresh concrete Dimension in mm Metallic, Frustum of a cone Alternative materials are allowed if requirements are met 12530-1 tests Tamping Rod Round, straight steel rod, length mm and diameter 16mm Tamping end rounded to a hemispherical tip Measuring Device Ruler Marked in increments of 5 mm or smaller Length of at least mm In addition, a scoop is needed.
Specifies two procedures for sampling fresh concrete: Scope This practice specifies methods for making and curing test specimens for strength tests. Find Similar Items This product falls into the following categories. Depending on the consistency of the concrete and the method of compaction, moulds shall be filled in one or more layers to achieve full compaction.
Protect the sample from the sun, wind, and other sources of rapid evaporation, and from contamination. Marking The fn specimens shall be marked clearly and indelibly, without damaging the specimen using a cub tag that contains the information related to the specimen Casting date, ticket number, specimen ID, location of sampling…. Customers who bought this product also bought BS EN The requirement for remixing the sample before tests on the fresh concrete, or before making test specimens, is included in the relevant standards.
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BS EN 12350-1/BS EN 12350-2/BS EN 12390-2/BS EN 12390-2
While the spot sampling takes scoopfuls from the initial discharge of the concrete from the truck mixer. Surface leveling Remove the excess concrete above the upper edge of the mould using the steel trowel or float and carefully level the surface.
Frequency shall be at least vibrations per minute The diameter of the internal vibrator not exceeding one-quarter of the smallest dimension of the test specimen Vibrating table with a minimum frequency of 40 Hz 2 cycles per minute Compacting rod or bar Preparation and filling of the moulds Before filling the mould, cover the inner surface of the mould with a thin film non-reactive release material to prevent the concrete from adhering to the mould.
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Procedure Place the TMD in the concrete so that the sensing portion is submerged a minimum of 75 mm. By continuing to use this website, you agree to their use. A sample of concrete is placed in a mold, shaped as the frustum of a cone, and compacted. 12530-1 in your details below or click an icon to log in: If the tamping operation of the top layer results in subsidence of the concrete below the top edge of the mould, add more concrete to keep an excess above the top of the mould at all times.
Usually, especially for big projects where a large quantity of concrete is cast, both 12350- come up with the designed mix and validated through trial mixes to compensates for this particular problem.
Thank you for another wonderful post.
Take the scoopfuls of concrete through the moving stream from truck mixer.