BS EN 13075-1-2012 pdf download.Bitumen and bituminous binders Determination of breaking behaviour
Part 1: Determination of breaking value of cationic bituminous emulsions, mineral filler method.
6 Apparatus
6.1 General
Usual laboratory apparatus and glassware, together with the specific equipment described below, depending on the procedure used (semi-automatic or manual). An explanatory sketch of the equipment set-up is shown in Figure 1 for the semi-automatic procedure.
6.2 Equipment for semi-automatic procedure
6.2.1 Stirrer motor, as shown in Figure 1, with an output power of at least 25 W, and a speed of (260 ± 60) r/min.
6.2.2 Stirrer, as shown in Figure 2, having the dimensions given in Figure 3, Figure 4 and Figure 5. In Figure 3, the dimensions are given as an example.
6.2.3 Metal cans, cylindrical, of approximate capacity of 500 ml, height of 95 mm and diameter of 90 mm.
6.3 Equipment for manual procedure
6.3.1 Enamelled or stainless steel dish, with approximately 20 cm inside diameter and height of 10 cm
6.3.2 Spatula, nickel or stainless steel, approximately 20 cm long.
6.4 Equipment for both procedures
6.4.1 Oven, capable of being maintained at (110 ± 5) °C.
6.4.2 Conical-shaped funnel, capable of supplying a continuous sufficient flow of filler to the filler feeder.
6.4.3 Adjustable filler feeder, to be placed at the outlet of the filler holding funnel and capable of feeding the filler at a rate ranging from 0,25 gls to 0.45 g/s. This equipment shall be calibrated. The calibration shall be achieved by weighing the amount of the filler poured during a period of time between 100 s and 200 s, measured with an accuracy of 0,2 s.
NOTE The feeding rate, q, in gls, should be calculated, using Fomiula (1):
6.4.4 Timer or stop watch, with an accuracy of 0,2 s or better over a time interval equal to or higher than
200 s.
6.4.5 Bottles, of approximate capacity of 500 ml, made of a material that will not react with the emulsion and having tight fitting lids.
6.4.6 Constant temperature bath andlor climatic chamber, capable of maintaining the sample in the bottle (6.4.5) at (25 ± 1) ‘C.
NOTE If the bath Is used to condition the emulsion sample bottles, it should be equipped with a frame or device to prevent the plastic bottles from moving in the water bath.
6.4.7 Balance, having a suitable range, capable of weighing the samples in Clause 8 to the nearest 0,1 g.
6.4.8 Thermometer, having a suitable range, capable of measuring the temperature to the nearest 0,2 °C.
7 Sampling
The test material shall be sampled in accordance with EN 58 and shall be prepared in accordance with
EN 12594.
8 Procedure
8.1 General
Carry out the procedure under normal laboratory conditions (18 °C to 28 °C). Before performing either of the two procedures however, ensure the following (preparatory) steps are taken:
dry the quantities of filler, required for the test, in the oven (6.4.1) at a temperature of (110 ± 5) C until constant mass arid cool to ambient temperature in a desiccator;
— pour a portion of emulsion (250 ± 10)9 into a bottle (6.4.5) and secure the lid;
— pour the required quantities of filler in a container and close the container;
place the bottle with the emulsion and the container with the filler in the constant temperature bath or climatic chamber (6.4.6) for a minimum of 1.5 h;
— transfer the required quantity of filler from the container into the hopper of the adjustable filler feeder.
8.2 Semi-automatic procedure
Weigh the metal can (6.2.3) containing the stirrer (6.2.2) to the nearest 0,1 g (rn1).
Transfer approximately (100 ± 1) g, weighed to the nearest 0,1 g (m.) of the emulsion sample from the bottle
(6.4.5) to the weighed metal can.
Place the metal can under the stirrer motor (6.2.1) and connect the stirrer (6.2.2) to the stirrer motor.
Start the stirrer motor, the filler addition and the timer simultaneously, ensuring that the stirrer blades rotate at (260 ± 60) rlmin and are below the surface of the emulsion during the test.
Rotate the metal can slowly (approximately 5 rlmin) by hand in the opposite direction to the stirrer in order to ensure homogeneity of mixing.
The mixture becomes thicker as the filler is added. The emulsion is considered broken when the mix comes off completely (or substantially) from the metal can. Turn off the filler feeder, the timer and the stirrer at this point.
Weigh the metal can containing the broken emulsion and the stirrer to the nearest 0,1 9 (in2).
Repeat the test with a second portion of emulsion taken from the same bottle using a second metal can and stirrer.
NOTE In case of dispute, only the semi-automated apparatus is allowed.BS EN 13075-1-2012 pdf download.
BS EN 13075-1-2012 pdf download
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