BS EN 1744-4:2021 pdf free download – Tests for chemical properties of aggregates Part 4: Determination of water susceptibility of fllers for bituminous mixtures.
B.1 General
This annex specifies the method for the determination of the water susceptibility of fillers for bituminous mixtures using the shaking abrasion method. The method is based on the procedure pursuant to EN 12 274-7 “Slurry surfacing — Test Methods — Part 7: Shaking abrasion test”.
B.2 Principle
The shaking abrasion test determines the water susceptibility of an asphalt mixture — prepared using fillers, fine aggregates and bitumen. The test measures the abrasion of standardized specimens that occurs when cylindrical specimens of a compacted asphalt mixture are placed in water-filled shaking cylinders, which are rotated around an axis in a suitable device with overhead movement. In addition, the cylindrical specimens are tested for swelling as a result of being stored in water.
Three cylindrical specimens measuring 30 mm in diameter are tested in each series of tests. They are prepared from a standardized specimen mixture using a standard bitumen. The specimens are statically compacted.
B.3 Apparatus
B.3.1 Conical steel bowl, 18 cm in diameter.
B.3.2 Porcelain crucible 1000 ml with handle.
B.3.3 3x porcelain crucible 125 ml with handle.
B.3.4 Porcelain pestle, 57 mm in diameter, 180 mm in length.
B.3.5 Stirring thermometer up to 220 °C.
B.3.6 Heater with air bath.
B.3.7 Heating chamber with air circulation, temperature controlled, for maintaining a temperature of (110±5)°Cand(150±5)°C.
B.3.8 Test sieves with metal mesh pursuant to ISO 33 10-1 with opening widths of 0,4 mm, 0,25 mm and 0,125 mm.
B.3.9 Compaction moulds with base plates pursuant to EN 12274-7 (at least 3 per series of tests).
B.3.1O Compaction pistons, one per compaction mould pursuant to EN 12 274-7.
B.3.11 Filling funnel pursuant to EN 12274-7.
B.3.12 Thermostatic water bath (EN 12697-12:20 18, Clause 5, Method A).
B.3.13 Vacuum system (EN 12697-12:20 18, Clause 5, Method A).
B.4 Materials
B.4.1 Binder.
The binder used for these tests is a bitumen 70/100 to EN 12591 “Bitumen and bituminous binders — Specifications for paving grade bitumen”. The reference for the applied bitumen can be found at www.fgsv.de/bezugsadressen.
B.4.2 Aggregate.
The fine aggregate 0/0,4 mm is composed of standard sands (“Fl-131” and “F36”). The reference addresses for the applied standard sands can be found at www.fgsv.de/bezugsadressen.
The aggregates shall be dried at (110 ± 5) °C inside the heating chamber. Drying aggregates with an open flame or an IR radiator is not permitted.
The unwashed aggregates are divided by dry sieving pursuant to EN 933-1:2012, 7.2 into the particle size classifications 0/0,125; 0,125/0,25; 0,25/0,4 mm.
B.5 Preparation of the specimens B5.1 Composition of the specimen mixture
The specimen mixture shall consist of 0/0,4 mm aggregate and standard bitumen 70/100 to EN 12591 and standard sands (“FH31” and ‘F36”) are used. The reference addresses for the applied bitumen and the applied standard sands can be found at www.fgsv.de/bezugsadressen.