BS EN 1097-2:2020 pdf free.Tests for mechanical and physical properties of aggregates.Methods for the determination of resistance to fragmentation.
BS EN 1097-2 This document describes the reference method, the Los Angeles test, used for type testing and in case of dispute (and an alternative method, the impact test) for determining the resistance to fragmentation of coarse aggregates (main text) and aggregates for railway ballast (Annex A). For
other purposes, in particular factory production control, other methods are possible provided that an appropriate working relationship with the reference method has been established.This document applies to natural, manufactured or recycled aggregates used in building and civil engineering.Annex A describes a method for the determination of resistance to fragmentation of aggregates for railway ballast.Annex B gives alternative narrow range classifications for the Los Angeles test and the impact test.Annex C contains construction, operation and safety requirements for the impact tester. Annex D describes a method for checking of the impact tester. Annex E gives precision data. Annex F contains a worked example of calculation of impact value SZ. Annex G gives an alternative narrow range classification for the Los Angeles test of 16/32 mm recycled aggregates.Annex H proposes an additional sieve for the evaluation of the Los Angeles test for railway ballast.Annex A is normative and Annexes B to H are informative.S275 of EN 10025-2:2004 which has been selected to be formed without undue stress, and can be welded without significant distortion. The drum shall be closed at both ends. It shall have an internal diameter of (711土5] mm and an internal length of (508土5) mm. The drum shall be supported on two horizontal stub axles fixed to its two end walls but not penetrating inside the drum; the drum shall be mounted so that it rotates about a horizontal axis.An opening (150土3) mm wide shall be provided, preferably over the whole length of the drum,to facilitate insertion and removal of the sample after the test. During the test, the opening shall be sealed so that it is dustproof, by using a removable cover which enables the inside surface to remain cylindrical.BS EN 1097-2 pdf download.