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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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. The use of SCC in practical concrete construction is steadily increasing.
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 e very important.
These should address three key properties: It is desirable, especially in the case of new constituents or new concrete compositions, to test the consistence of fresh SCC before casting in place. A number of test methods including this test are available for testing fresh SCC.
According to the results from this EU project, it seems no single test method can completely cover all three key properties. Nevertheless any test method should at least be correlated to the practical situation and give consistent results in order to provide reliable data for judgment of concrete workability.
This standard is one of a series concerned with testing fresh concrete.
ENTesting fresh concrete, consists of the following parts: 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.
If cement or concrete enters the eye, immediately wash it out thoroughly with clean water and seek medical treatment without delay. Wash wet concrete off the skin immediately.
The test is not suitable when the maximum size of the aggregate exceeds 40 mm. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document including any amendments applies. 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.
It is based on the slump test described in EN The result is an indication of the filling ability of self-compacting concrete. The t time is a measure of the speed of flow and an indication of the relative viscosity of the self-compacting concrete.
The fresh concrete is poured into a cone as used for the EN slump test. 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. The largest diameter of the flow 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.
Measurement of the t time may be omitted if not requested. The plate shall have a flat, smooth surface. If the plate is made from other materials, in-use performance test data shall be available which demonstrates long-term equivalence with steel plate. The surface shall not be readily attacked by cement paste or be liable to rusting. The construction of the plate shall be such as to prevent distortion.
The deviation from flatness shall not exceed 3 mm at any point when a straight edge is placed between opposing sides and corners. All lines to be a maximum of 2,0 mm wide and 1,0 mm deep. NOTE The collar allows the test to be carried out by one person. 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 Check the top surface for horizontality using the spirit level.
Clean the table and the cone and dampen immediately prior to testing, but keep free from excess moisture.
BS EN – Testing fresh concrete. Self-compacting concrete. Slump-flow test
Fit the collar to the cone if being used. Place the cone centrally within the mm circle on the baseplate and hold in position by standing on the foot pieces or use the collarensuring that no concrete can leak from under the cone. Fill the cone in one operation without any agitation or mechanical compaction, and strike off surplus from the top of the cone.
Allow the filled cone to stand for not more than 30 s; during this time remove any spilled concrete from the baseplate. Lift the cone vertically in 1 s to 3 s in one movement without interfering with the flow of concrete. If the t time has been requested, 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.
BS EN 12350-8:2010
Then 12530-8 the diameter of the flow spread at eh angles to d to the nearest 10 mm and record as d to the nearest 10 mm. If the difference 1 2 between d and d is greater than 50 mm another sample shall be taken and the procedure repeated. Check the concrete spread for signs of segregation and report under item 8, f in a qualitative way, e. The report may include: The resulting values for r and R are given in Tables 1 and 2.
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