DIN EN 933-8:2012-04

This document (EN 933-8:2012) describes the reference method used for type testing and in case of dispute for the determination of the sand equivalent value of 0/2 mm fraction (for 0/4 mm, see Annex A) in fine aggregates or all-in aggregates. For other purposes, in particular factory production control, other methods may be used provided that an appropriate working relationship with the reference method has been established. A 0/2 mm test specimen of aggregate with a maximum fines content of 10 % (either natural or obtained after grading curve adjustment) and a small quantity of washing and flocculating solution are poured into a graduated cylinder and are agitated to loosen the clay coatings from the coarser particles in the test portion. The aggregate is then 'irrigated' using additional washing and flocculating solution forcing the fine particles into suspension. After a fixed time, the sand equivalent value (SE(10)) is calculated as the height of sediment expressed as a percentage of the total height of sediment and suspension in the cylinder. This document (EN 933-8:2012) has been prepared by Technical Committee CEN/TC 154 "Aggregates", the secretariat of which is held by BSI (United Kingdom). The responsible German committee is Working Committee NA 062-03-13 AA "Gesteinskörnungen; Prüfverfahren, Petrographie, Probenahme und Präzision" ("Aggregates; test methods, petrography, sampling and precision") at the Materials Testing Standards Committee (NMP) of DIN. This standard is one of a series of standards for tests for geometrical properties of aggregates. Test methods for other properties of aggregates are covered by the following European Standards: EN 932, Tests for general properties of aggregates EN 1097, Tests for mechanical and physical properties of aggregates EN 1367, Tests for thermal and weathering properties of aggregates EN 1744, Tests for chemical properties of aggregates EN 13179, Tests for filler aggregate used in bituminous mixtures. The other parts of EN 933, Tests for geometrical properties of aggregates, are: - Part 1: Determination of particle size distribution - Sieving method - Part 2: Determination of particle size distribution - Test sieves, nominal size of apertures - Part 3: Determination of particle shape - Flakiness index - Part 4: Determination of particle shape - Shape index - Part 5: Determination of percentage of crushed and broken surfaces in coarse aggregate particles - Part 6: Assessment of surface characteristics - Flow coefficient of aggregates - Part 7: Determination of shell content - Percentage of shells in coarse aggregates - Part 9: Assessment of fines - Methylene blue test - Part 10: Assessment of fines - Grading of filler aggregates (air jet sieving) - Part 11: Classification test for the constituents of coarse recycled aggregate. The following modifications have been made with respect to DIN EN 933-8:1999-05: a) limitation of the fines content of the 0/2 mm size fraction to 10 %; b) standard editorially revised.