BS EN 13286-4:2021 PDF Download

BS EN 13286-4:2021 is a standard that provides a method for determining the relationship between the dry density and water content of unbound and hydraulically bound mixtures using vibrating hammer compaction. This standard is applicable to mixtures that contain no more than 10% by mass of the mixture retained on the 40 mm test sieve.

The standard is intended for manufacturers and suppliers of unbound and hydraulically bound mixtures, suppliers of binders like cement and fly-ash, equipment suppliers, civil engineers, contractors, and highway and road transport authorities. It is particularly useful for those involved in the construction and maintenance of pavement sub-base layers.

By following the testing methods specified in BS EN 13286-4:2021, users can determine the relationship between dry density and water content, as well as calculate and plot the curves corresponding to 0%, 5%, and 10% air voids. This information is important for determining the maximum dry unit weight and water content range for successful compaction of granular soils using a vibrating hammer.

The latest version of this standard, BS EN 13286-4:2021, has undergone editorial revisions and includes changes such as the removal of the particle size requirement at 20mm, advice on using the test method with absorbent aggregates and soils, and the inclusion of text relating to different compaction curves and the definition/selection of optimum water content. Additionally, an annex on compactibility testing for graded aggregates has been removed as it was deemed unnecessary.