How can I determine the fibre dosage rate on fresh or on hardened concrete?
The best way to check fibre dosage rates is to do so with fresh concrete as this allows for corrective actions to take place prior to concrete placement. Normally the concrete volume to be analyzed should be at least ten (10) litres to avoid large deviations in the obtained results. The fines can be washed out from the fresh concrete and the fibres extracted by a magnet. This procedure is rather simple but time consuming. Therefore the use of the ArcelorMittal dosometer is recommended for this purpose. This tool allows for easy and safe collection of the SFRC sample while acting as a simple and safe mechanism for separating the steel fibres from the concrete constituents. Here the fibres are extracted directly from the fresh concrete magnetically. The extracted fibres must then be dried and weighed to calculate the corresponding dosage rate. Determining the fibre dosage rate on hardened concrete is not very accurate. This is mainly due to the fact, that it can only be done on drilled c
