Guide to the interpretation of petrographical examinations for alkali-silica reactivity1 Scope This British Standard gives guidance on the interpretation of the results of petrographical examination of coarse and fine aggregates, carried out in accordance with BS 812104, in terms of the susceptibility of the combined aggregate to alkali silica reactivity (ASR) sufficient to cause damage to concrete in which it is used. The guidance is not applicable to alkali carbonate reactive materials. NOTE 1 Guidance on precision expected from the

PD ISO/TR 23605:2009 Technical product specification (TPS)

a sample stage that permits defined photoelectron emission angles and a spectrometer with an input lens that can be restricted to less than a 6° cone semi-angle

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