BS EN 933 is a European Standard on tests for geometrical properties of aggregates. The main aim of the BS EN 933 series is to provide the best industry guidance to ensure construction materials contribute to the structural integrity of civil engineering works.
BS EN 933-1 is the first part of the BS EN 933 series that describes the reference washing and dry sieving method used for type testing and in case of dispute, for determination of the particle size distribution of aggregates.
For other purposes, in particular factory production control, other methods may be used, provided that an appropriate working relationship with the reference method has been established.
BS EN 933-1 applies to all aggregates, including lightweight aggregates, up to 90 mm nominal size, but excluding filler.
BS EN 933-1 on geometrical properties of aggregates is useful for:
Particle size and gradation have more influence on the performance of hardened concrete, asphalt, and base material performance than any other characteristic of aggregates. The size and distribution of particles are assessed to determine the properties of stiffness, strength, workability, permeability, and stability, amongst others. Ultimately, the particle size distribution of aggregates is a determining factor for the wearing behaviour of asphalts.
In this regard, BS EN 933-1 provides the requirements for apparatus, reagents, test preparation and test procedure to evaluate the particle size distribution of aggregates.
As a result, if you are a manufacturer of aggregates, conforming to BS EN 933-1 can demonstrate the performance and credibility of your products.
Overall, the dry sieving method mentioned in BS EN 933-1 is used to determine compliance with the particle size distribution with applicable specification requirements and to provide necessary data for the quality control of the production of various aggregate products and mixtures containing aggregates.EN 933-1:2012