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Various types of fibre may be added to the concrete to improve its properties, either in the fresh (unhardened) state or in service.
The main fibres used are steel, polypropylene and glass. The test requires that a measured, random test sample is selected and washed out using a sieve, to leave only the fibres and aggregates.
The sample is then spread out on a polythene sheet, and the steel fibres are picked out using a magnet. The fibres are then weighed while still wet, and the results recorded. These show the kg/m3 rate of fibre density in the sample.
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Various types of fibre may be added to the concrete to improve its properties, either in the fresh (unhardened) state or in service.
The main fibres used are steel, polypropylene and glass. The test requires that a measured, random test sample is selected and washed out using a sieve, to leave only the fibres and aggregates.
The sample is then spread out on a polythene sheet, and the steel fibres are picked out using a magnet. The fibres are then weighed while still wet, and the results recorded. These show the kg/m3 rate of fibre density in the sample.