BS EN 13286-4:2021 pdf free download – Unbound and hydraulically bound mixtures Part 4: Test methods for laboratory reference density and water content一Vibrating hammer.
This document specifies a method for the determination of the relationship between the dry density and water content of a mixture using vibrating hammer compaction.
This document applies to mixtures which contain no more than 10 % by mass of the mixture retained on the 40 mm test sieve.
This document also describes the procedure for calculating and plotting the curves corresponding to 0%, 5 % and 10% air voids.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 93 2-2, Testsforgeneral properties of aggregates – Part 2: Methods for reducing laboratory samples
EN 93 3-1, Tests for geometrical properties of aggregates – Part 1: Determination of particle size distribution – Sieving method
EN 1097-5, Tests for mechanical and physical properties of aggregates – Part 5: Determination of the water content by drying in a ventilated oven
EN 13286-1, Unbound and hydraulically bound mixtures – Part 1: Test methods for laboratory reference density and water content – Introduction, general requirements and sampling
3 Terms and definitions
5.10 Metal or plastic trays.
5.11 Suitable scoop.
5.12 Stopclock or similar timer, readable to 1 s.
5.13 Apparatus for extracting the sample from the mould.
6 Preparation
6.1 Preparation of the sample for test
NOTE I Care needs to be taken with aggregates and soils that absorb water. If supplied dry, such materials need to be pre-treated with sufficient water beforehand and for sufficient time to allow full absorption to take place.
NOTE 2 HBM include treating agents that depending on their nature either quickly or slowly commence reaction and setting in contact with water and, in the case of quick lime, slake when coming into contact with water. What follows therefore needs to recognize this and ensure that testing is completed before any setting corn me nces.
Weigh and record the mass of the sample. The sample shall have a mass of at least 50 kg. Determine the water content of the sample using the procedures described in EN 932-2 and EN 1097-5.
Remove all of the particles retained on the 40 mm test sieve from the remainder of the sample. Use the sieving procedures described in EN 933-1, without first washing and drying the sample. If necessary, sieve in parts to ensure that the test sieve is not overloaded.
Weigh and record the mass of the particles retained on the 40 mm sieve.
If the sample contains 5 % or less, by mass, of particles retained on the 40 mm test sieve, the resulting modified sample shall be considered as the test portion.
If the sample contains more than 5 % but less than 10 %, by mass, of particles retained on the 40 mm test sieve, further modify the sample by adding an equal mass of similar material which passes the 40 mm test sieve but is retained on the 20 mm test sieve.
6.2 Preparation of the test portions.