BS EN 13302-2010 pdf download.Bitumen and bituminous binders Determination of dynamic viscosity of bituminous binder using a rotating spindle apparatus.
7.1 General
This paragraph is divided in several parts to cope with small deviations in procedure due to differences in the
product types covered by this European Standard.
7.2 Bituminous binders (unmodified and modified)
7.2.1 Preparation of test sample
The bulk binder sample shall be placed In an oven maintained at a temperature of about 80 °C above the expected ring and ball softening point temperature or at a maximum of 200 °C which ever is the lower (in case of oxidised bitumen the maximum temperature is 230 °C). Do not overfill or underfill the sample container, as the sample volume is cntical to meet the system calibration conditions. The container shall be covered with a loose lid to protect it against oxidation. The test sample shall be fluid before transferring it to the sample container. The total heating time should not exceed 1 h 45 mm for samples of 100 ml to 499 ml and 2 h 15 mm for samples of 500 ml to 999 ml. Test samples shall be tested within 4 h of the start of their preparation.
7.2.2 Preheating
Set the temperature control device to the desired test temperature. Refer to the operating instructions for the calibration of the temperature control device if necessary.
Connect the selected spindle to the rotating spindle viscometer and lower It into an empty sample container placed into the temperature control device. Wait until equilibrium temperature is obtained (about 1 h). If, for practical reasons, the spindle cannot be preheated while being connected to the viscometer, it is admitted that it is connected at ambient temperature and lowered into the hot sample. Temperature equilibration time has then to be extended accordingly.
Additional sample containers may be preheated at the same temperature in a separate oven for at least 45 mm.
Remove the sample container from the temperature control device or the oven and add the volume of sample specified for the spindle to be used. Do not overfill or underfill the sample container, as the sample volume is critical to meet the system calibration conditions. Avoid incorporation of air bubbles into the samples.
Place the loaded sample container into the temperature control device. Lower the spindle into the sample to the depth specified by the manufacturer.
Ensure the equipment is level by use of a levelling device (e.g. spirit level). Allow the system to equilibrate at the test temperature.
Allow the moveable part to rotate during the pre-heating time at a very low shear rate. Maintain the temperature during the test at within ± 0,5 °C up to 100 °C and ± 1,0 °C above 100 °C.
viscosity (where necessary, apply the form factor (see Clause 3.6) to calculate dynamic viscosity from the reading of the instrument),
— shear rate.
– temperature.
The reading shall be within the limits set for complying with the requirements on accuracy defined under 5.2. If it is not, change one of the variables, i.e. the shear rate or the rotating equipment, and repeat the measurement to obtain a new result, complying with the requirements of 5.2. The actually achieved accuracy shall be recorded In the report (Clause 10).
Repeat the measurement.
NOTE A change of the measurement geometry implies the procedure to be repeated from 7.2.1 onwards.
Reuse of sample is allowed for successive measurements at different temperature levels, as long as the total
time for the hot sample does not exceed 4 h.
7.2.4 Test conditions
This document specifies a test applicable to a large diversity of products for which the usable temperatures and shear rates are not necessarily the same. Typical test temperatures range from 90 °C to 180 °C.
Depending on the product (e.g. in the case of polymer modified binders) and test temperature, the material may display non-Newtonian behaviour. In such cases, it is recommended to determine dependency upon shear rate following a path going from low to high, then from high to low shear rates.
7.2.5 Repeat the measurement on a second separate sample.
7.2.6 Continue with Clause 8.
7.3 Bituminous emulsions
7.3.1 Place and maintain the bulk emulsion sample at the required test temperature in an appropriate oven. Before transferring the emulsion into the sample container, manually agitate the bulk emulsion sample to ensure homogeneity, without imparting excessive stress to the sample.
To maintain the integrity of the sample and reduce the chance of evaporation or skinning, ensure the sample is covered when not being agitated.
7.3.2 Set the temperature control device to the required test temperature. Refer to the operating instructions for the calibration of the temperature control device if necessary. Place the sample container and the selected spindle into the temperature control device (or in the oven) and wait until equilibrium temperature is obtained.BS EN 13302-2010 pdf download.