Particle size analysis of powders for concrete manufacturers

The particle size distribution of powders incorporated into a concrete formulation affects their behavior during mixing, their reactivity, the packing density of the granular skeleton, and the properties of the material both in the fresh state and after hardening. A change in particle size can notably alter water requirements, rheology, mix stability, or production repeatability.

Filab laboratory supports concrete manufacturers with the particle size analysis of powders such as binders, mineral additions, fillers, or extenders. The results can be used to compare a batch with an internal specification, monitor supply variability, or investigate process drift.

In addition, studying the particle size distribution can be combined with an assessment of powder flowability to gain a broader understanding of powder behavior during storage, dosing, and transfer.

The particle size curve describes the proportion of particles according to their size. Depending on the objective of the study, Filab laboratory can report characteristic percentiles, such as D10, D50, and D90, along with the information required to compare several samples. Analysis of the fine fraction, coarse fraction, and distribution range helps identify differences between batches.

The quality of an analysis depends on the representativeness of the sample collected. We recommend submitting a sample from an identified batch and providing all available information about the material: designation, supplier, batch number, storage conditions, relevant process, and applicable specification. For comparison purposes, samples should be collected using the same procedure.

When a change in behavior is observed during production, comparing the particle size distribution of a compliant batch with that of the affected batch can help objectively establish a difference in the raw material. In particular, it can verify whether the particle size distribution of a powder has changed compared with a reference.

A relevant powder analysis begins by defining the need: material type, expected size range, control or comparison objective, sample representativeness, and acceptance criterion. Filab laboratory develops an analysis strategy consistent with these parameters.

The characterization can provide a particle size distribution and particle size indicators useful for quality management. The results are interpreted in light of the available data: specification, reference sample, batch history, or formulation requirements.

For investigations involving the finished material, Filab laboratory can also support industrial companies wishing to reconstruct the formulation of an existing concrete or examine the possible causes of a defect in a structure.

Particle size data are most meaningful when compared with a reference defined by the manufacturer: acceptance range, qualified batch, supplier technical data sheet, or historical result. This approach facilitates raw material monitoring and the objective assessment of a change in supply, grinding, sieving, or packaging.

Moisture, agglomeration, the presence of foreign particles, or insufficient dispersion can affect the measurement. Filab laboratory works with your team to define the most appropriate packaging precautions and preparation conditions for the powder being studied. This step is essential for obtaining interpretable results.

Particle size distribution is one investigative tool among others. Its interpretation should be considered alongside the formulation, manufacturing conditions, control results, and the properties observed in the concrete. To further examine a degraded material or one exhibiting defects, see our support service for analysing cracked concrete.

To prepare your request, specify the nature of the powder, the number of samples, the purpose of the particle size analysis, the expected results, and any available specifications. The Filab laboratory can assist you in defining the scope of the testing, arranging shipment of the samples, and using the results as part of your quality control or investigation.

Describe your requirements, send your samples, and request your analysis quote.