BS EN 12697-6:2020 pdf free download

BS EN 12697-6:2020 pdf free download.Bituminous mixtures – Test methods Part 6: Determination of bulk density of bituminous specimens.
7 Sample sizes and sample handling
The minimum thickness of the specimen shall be 20 mm or two times the maximum nominal size of the aggregate, whichever is largest.
Care shall be taken to ensure that the specimens are not disturbed during handling. The specimens shall be stored in a cool place at a temperature not exceeding 25 °C.
8 Preparation of sample
Specimens shall be cleaned if necessary, by brushing or washing, as required.
The specimens shall be dry, have a known water content, or be allowed to dry to constant mass.
NOTE Constant mass is defined as successive weighings after drying at least 1 h apart not differing more than 0,1 %.
9 Procedure
9.1 General
All masses shall be determined in gram to the nearest 0,1 g. All measurements shall be determined in millimetre to the nearest 0,1 mm.
NOTE General guidance on determining the required procedure related to the specific bituminous material is given In Annex A.
9.2 Procedure A: Bulk density — dry
Carry out the procedure as follows:
a) Determine the mass of the dry specimen (mi). When testing damp specimens, step a) shall be carried out after steps b) to d).
b) Determine the density of the water at test temperature at the nearest 0,000 1 Mg/mi (p) according to 5.1.
c) Immerse the specimen in the water-bath kept at known test temperature.
d) Determine the mass of the specimen immediately the water has settled after immersion (mz).
9.3 Procedure B: Bulk density — Saturated surface dry (SSD)
Carry out the procedure as follows:
a) Determine the mass of the dry specimen (mi). When testing damp specimens, step a) shall be carried out after steps b) to g).
b) Determine the density of the water at test temperature to the nearest 0,000 1 Mg/rn3 (pw) according to 5.1.
c) Immerse the specimen in the water-bath at known test temperature. Allow the water to saturate the specimen sufficiently long enough for the mass of the specimen not to change.
In general, the required saturation period is 30 mm but should not be more than 3 h.
d) Determine the mass of the saturated specimen when immersed (m2), taking care no air bubbles adhere to the surface of the specimen or leave the specimen when weighing.
e) Remove the specimen from the water, dry the surface from adhered drops by wiping with a damp Chamois.
fl If water continues to drain from the sample, discontinue the measurement by Procedure B, saturated surface dry, and undertake the measurement by Procedure C, sealed specimen or procedure D if applicable.
g) Determine the mass of the saturated, surface wiped specimen in air immediately after drying (mi).
9.4 Procedure C: Bulk Density — Sealed specimen
Carry out the procedure as follows:
a) Determine the mass of the dry specimen (ml). When testing damp specimens, step a) shall be carried out after steps b) to f).
b) Determine the density of the water at test temperature to the nearest 0,000 1 Mg/rn3 (pm.) according to 5.1.
c) Seal the specimen with material according to 5.2 in such a way, that the internal voids in the specimen being part of the volumetric material composition are not penetrated and that no extra voids are included between seal and specimen or in seal folds. After sealing, the specimen shall be inaccessible to water when submerged.
When using paraffin wax, obtain sealing using the following procedure:
1) Bring the paraffin wax to its melting temperature + 10 °C and maintain this temperature at ± 5 °C.
2) Immerse the specimen partially in the paraffin wax for less than 5 s, agitating the specimen to make the air balls free. After cooling and solidification of the paraffin wax on this part of the specimen, repeat the same procedure on the other part. Repeat these procedures until a continuous film of paraffin wax is obtained, which totally cover the specimen.
d) Determine the mass of the dry sealed specimen (m2).
e) Immerse the specimen in the water-bath kept at known test temperature.BS EN 12697-6 pdf download.