BS EN 1430-2000 pdf download.Methods of test for petroleum and its products — BS 2000-292:Bitumen and bituminous binders — Determination of particle polarity of bitumen emulsions (Identical with
IP 292-2000).
This BS EN 1430 specifies a method for the determination of the particle polarity of bitumen emulsions.
WARNING The use of this standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2 Normative references
This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies.
EN 58, Sampling bituminous binders.
EN 12594, Bitumen and bituminous binders — Preparation of test samples.
EN ISO 3696, Water for analytical laboratory use — Specification and test methods
(1S03696: 1987).
ISO 5280, Xylene for industrial use — Specification.
3 Definition
For the purposes of this standard, the following definition applies.
particle polarity
sign of the electric charge carried by particles in ionic emulsions
NOTE: In cationic emulsions, particles have positive polarity. In anionic emulsions, particles have negative polarity.
5.3 Ethanol, 99 % minimum
6 Apparatus
Usual laboratory apparatus and glassware, together with the following.
6.1 Electrical circuit, (see Figures 1 and 2) consisting of the following components.
6.1.1 Current source, capable of supplying a direct or rectified current of 8 mA at a potential of 12 V to 15 V for 30 mm.
6.1.2 Milliammeter, with a full scale deflection of 10 mA.
6.1.3 Variable resistor.
6.1.4 Electrodes, two stainless steel plates approximately 100 mm long, 25 mm wide and
1,0 mm thick, with an insulating device to hold the plates parallel and 12 mm apart in the emulsion (see Figure 2).
6.1.5 Insulator, polytetrafluoroethylene resin square rod, virgin electrical grade, 12 mm long.
6.2 Glass beaker, 150 ml or 250 ml capacity.
6.3 Glass rod, approximately 100 mm long and 6 mm thick or other suitable device that is
capable of insulating and suspending the electrode assembly in the emulsion.
6.4 Timing device, stop watch or other suitable device.
7 Sampling
The laboratory sample shall be sampled in accordance with EN 58 and shall be prepared in accordance with EN 12594.
The sample shall be divided into two portions; in case of doubt concerning the results, both portions shall be tested.
NOTE: The second portion is tested only in the exceptional case where the observation made according to 86 results in a doubtful conclusion.
8.2 Pour sufficient emulsion into a beaker (6.2) to permit immersion of the electrodes to a depth of approximately 25 mm in the emulsion. Suspend the electrodes, separated by the insulator (6.1.5), from the glass rod (6.3) across the top of the beaker. Immerse the electrodes to the required depth in the emulsion by placing the glass rod across the top of the beaker.
NOTE: Any apparatus capable of manual height adjustment and of insulating and suspending the electrodes in the emulsion may be used.
8.3 Connect the electrodes (6.1.4), which have been cleaned (see 8.1) and dried, to the direct current source (6.1.1), as shown in Figure 2.
8.4 Adjust the current to between 8 mA and 10 mA with the variable resistor (6.1.3) and start timing with a suitable timing device (6.4). Record the current used.
8.5 When the current drops to 2 mA, or at the end of 30 mm, whichever occurs first, disconnect the current source, and gently wash the electrodes in running water.
8.6 Observe the deposition of bituminous binder deposit on the electrodes, and record the polarity of this.
NOTE: A cationic emulsion (with positive polarity) will deposit an appreciable layer of binder on the cathode (negative electrode). An anionic emulsion (with negalive polarity) will deposit an appreciable layer of binder on the anode (positive electrode).
9 Expression of results
Express the polarity of bitumen particles in the emulsion as positive or negative (see 8.6).
10 Test report
The test report shall contain at least the following information:
a) the type and complete identification of the sample under test;
b) a reference to this European Standard;
C) the current used (see 8.4);
d) the result of the test (clause 9);
e) any deviation, by agreement or otherwise, from the procedure specified;
f) the date of the test.BS EN 1430-2000 pdf download.