It supersedes BS EN which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee B//1. , DAY RATE: Sampling/Slump/Making/Storage BS EN /BS EN /BS EN /BS EN · Concrete Cube Coring Drilling, POA. Specifies a method for determining the consistency of fresh concrete by the slump test, which is sensitive to changes in the consistence of concrete and.
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It supersedes BS EN A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary sb of a contract. Users are responsible for its correct application.
Compliance with a British Standard cannot confer immunity from legal obligations. Up-to-date lists and bibliographical 123550-2 concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by Octoberand conflicting national standards shall be withdrawn at the latest by October Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
This document supersedes EN The compaction of specimens in the moulds using hand tamping, vibrating table, or internal poker vibrator are accepted as equivalent. However, it was found in this programme that the use of an internal vibrator to compact specimens of air entrained fresh concrete should only be done with caution, if loss of entrained air is to be avoided.
Curing specimens in a closely regulated humidity chamber is recognised as being equivalent to curing in water. This standard is one of a series concerned with testing concrete. The series EN includes the following parts: Sn Testing hardened concrete — Part 1: Shape, dimensions and other requirements of specimens and moulds; Part 2: Making and curing specimens for strength tests; Part 3: Compressive strength of test specimens; Part 4: Compressive strength – Specification for testing machines; Part 5: Flexural strength of test specimens; Part 6: Tensile splitting strength of test specimens; Part 7: Density of hardened concrete; Part 8: Depth of penetration of water under pressure.
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. It covers the preparation and em of moulds, compaction of the concrete, levelling the surface, curing of test specimens and transporting test specimens. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments applies. ENTesting fresh concrete — Part 1: Sampling ENTesting hardened concrete — Part 1: Shape, dimensions and other requirements for specimens and moulds 3 Apparatus 3.
It shall be of appropriate dimensions such that the concrete can be thoroughly re-mixed, using the wn shovel; 3. The sample shall be re-mixed, using the remixing container and square mouth shovel, before filling the moulds. In the case of self-compacting concrete, the mould shall be filled in one operation and no mechanical compaction shall be applied during filling or after the mould is filled.
Each layer shall be compacted by using one of the methods described in 5. NOTE 1 Full compaction is achieved using bd vibration, when there vs further appearance of large air bubbles on the surface of the concrete and the surface becomes relatively smooth with a glazed appearance, without excessive segregation. NOTE 2 Further guidance on methods of compaction for concretes having different consistencies or cast in different sizes of moulds, may be given in national annex NA.
Avoid over- vibration, which may cause loss of entrained air. NOTE 1 Care should be taken not to damage the mould.
BS EN 12350-2:2009
The vibrator should be vertical and not allowed to touch the bottom or sides of the mould. The use of a filling frame is recommended.
NOTE 2 Laboratory tests have shown that great care 123502- needed if loss of entrained air is to be avoided ns using an internal vibrator. The mould should preferably be attached to, or firmly held against the table. Avoid over-vibration, which may cause loss of entrained air. Ensure that the compacting rod, or bar, does not forcibly strike the bottom of the mould when compacting the first layer, nor penetrate significantly any previous layer.
Subject the concrete to a sufficient number of strokes per layer, typically 25 for concretes having a consistence equivalent to slump classes S1 and S2, in order to remove pockets of entrapped air but not the entrained air. After compaction of each layer, tap the sides of the container smartly with the mallet until large bubbles of air cease to appear on the rn and depressions left by the compacting rod or bar, are removed.
BS EN 新拌混凝土试验.坍落试验 – MBA智库文档
NOTE 1 In case of dispute, curing in water shall be the reference method. Regular checks should be made that surfaces of specimens in the chamber are continuously wet.
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BS EN 12350-1/BS EN 12350-2/BS EN 12390-2/BS EN 12390-2
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