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RILEM Recommended Test Method AAR-1 'Detection of potential alkali-reactivity aggregates' Petrographic method



Title: RILEM Recommended Test Method AAR-1 'Detection of potential alkali-reactivity aggregates'
Petrographic method
Author(s): RILEM TC 191-ARP
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 36
Issue: 261
Issue date: 2003-08-01
Publication year: 2003
Pages: 480 - 496
Total Pages: 17
Nb references: 2
Language: English


Abstract: Petrographic analysis shall always be the first step in the assessment of the potential alkali-reactivity of concrete aggregates as stated in RILEM AAR-0 entitled, ‘Outline Guide to the Use of RILEM Methods in Assessments of Aggregates for potential alkali-reactivity’.
This RILEM method specifies a general procedure for the petrographic examination of concrete aggregates, to identify rock types and minerals that might react with hydroxyl ions from the concrete pore solution.
The method, including sampling, is intended to be used for the routine examination of natural aggregates including sand, coarse gravel, all-in and crushed rock aggregates, in testing laboratories, rather than by expert petrographers for research purposes.
The method can be also used to quantify the amounts of various mineral and rock types where required.
The main objective of the RILEM petrographic method is to determine a classification of a particular aggregate in terms of alkali-reactivity.
As a result of undergoing the RILEM petrographic examination an aggregate should be classified as one of the following: Very unlikely to be alkali-reactive Class I Alkali-reactivity uncertain Class II Very likely to be alkali-reactive Class III Acceptance and experience with reactive constituents differ between countries, and thus, final assessment of reactive constituents should where possible follow national or regional experiences, recommendations and specifications.
RILEM AAR-0 also gives guidance on the further testing that may be undertaken on the basis of the findings of the AAR-1 petrographical examination.
It is very important that the petrographic analysis is carried out by a qualified geologist or petrographer with experience of materials used for concrete and good local knowledge of alkali-reactive aggregates and minerals.


Online publication: 2003-06-27
Classification: RILEM Technical Committees
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/14060


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