BS EN BRITISH STANDARD National foreword This British Standard is the UK implementation of EN This publication does not. Find the most up-to-date version of BS EN at Engineering PREN Draft BS EN Testing fresh concrete. Part 8: Self- compacting concrete – Slump-flow test.
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Licences can cover as few or as many users as you wish. This European Standard shall be 12305-8 the status of a national standard, either by publication of an identical text or by endorsement, at the latest by Januaryand conflicting national standards shall be withdrawn at the latest by January The t time is a measure of the speed of flow and an indication of the relative viscosity of the self-compacting 12350–8.
This European Standard specifies the procedure for determining the slump-flow and t time for self-compacting concrete. Allow the filled cone to stand for not more than 30 s; during this time remove any spilled concrete from the baseplate.
Sb is based on the slump test described in EN A list of organizations represented on this committee can be obtained on request to its secretary.
BS EN – Testing fresh concrete. Self-compacting concrete. Slump-flow test
Dimensions in millimetres Figure 1 — Baseplate Dimensions in millimetres Figure 2 — Example of dimensions of a steelweighted collar 5 Test sample The sample shall be obtained in accordance with EN The result is an indication of the filling ability of self-compacting concrete.
Since SCC has to give satisfactory in-situ properties perfect filling of the mould and embedment of the reinforcement, homogeneity and full compaction without vibration, the proper methods for testing the fresh SCC are very important. For dated references, only the edition cited applies. Need more than one copy? The surface shall not be readily attacked by cement paste or be liable to rusting. Owing to its significant advantages in the improvement of construction quality and working environment, self- compacting concrete SCC has been widely accepted by the construction owners.
If the difference 1 2 between d and d is greater than 50 mm another sample shall be taken and the procedure repeated. Customer Services If you need international and foreign standards from other Standards Development Tel: This publication does not purport to include all the necessary provisions of a contract.
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Fill the cone in one operation without any agitation or mechanical compaction, and strike off surplus from the top of the cone.
We have no amendments or corrections for this standard. NOTE 1235-8 collar allows the test to be carried out by one person. The report may include: Take precautions to avoid dry cement entering the eyes, mouth and nose whilst mixing concrete. Prevent skin contact with wet cement or concrete by wearing suitable protective clothing. A number of test methods including this test are available for testing fresh SCC.
BS EN 12350-8:2010
The deviation from flatness shall not exceed 3 mm at any point when a straight edge is placed between opposing sides and corners. Proceed to Checkout Continue Shopping. It is desirable, especially in the 21350-8 of new constituents or new concrete compositions, to test the consistence of fresh SCC before casting in place.
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These should address three key properties: For further information, email bsmusales. Slump-test 3 Principle The slump-flow and t time is used to assess the flowability and the flow rate of self-compacting concrete in the absence of obstructions.
E worldwide for CEN national Members. All lines to be a maximum of 2,0 mm wide and 1,0 ne deep. If the t time has been 1235-08, start the stop watch immediately the cone ceases to be in contact with the baseplate and record the time taken to the nearest 0,1 s for the concrete to first touch the mm circle After the flow of concrete has stabilized without disturbing the baseplate or concrete, measure the largest diameter of the flow spread and record as d1 to the nearest 10 mm.
This standard is one of a series concerned with testing fresh concrete. Organizations sn all sizes and across all sectors choose standards to help Copyright them achieve their goals. When the cone is withdrawn upwards the time from commencing upward movement of the cone to when the concrete has flowed to a diameter of mm is measured; this is the t time.
Find out more about British Standards by visiting our website at commercial publication and use. The resulting values for r and R are given in Tables 1 and 2. Fit the collar to the cone if being used. The largest diameter of the ns spread of the concrete and the diameter of the spread at right angles to it are then measured and the mean is the slump-flow.