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Petrographic Atlas: Characterisation of Aggregates Regarding Potential Reactivity to Alkalis

RILEM TC 219-ACS Recommended Guidance AAR-1.2, for Use with the RILEM AAR-1.1 Petrographic Examination Method

  • Isabel Fernandes
  • Maria dos Anjos Ribeiro
  • Maarten A T M Broekmans
  • Ian Sims

Table of contents

  1. Front Matter
    Pages i-xi
  2. Isabel Fernandes, Maarten A. T. M. Broekmans, Maria dos Anjos Ribeiro, Ian Sims
    Pages 1-7
  3. Isabel Fernandes, Helena Martins, Maria dos Anjos Ribeiro, Fernando Noronha, Maarten A. T. M. Broekmans, Ian Sims
    Pages 9-41
  4. Isabel Fernandes, Maarten A. T. M. Broekmans, Maria dos Anjos Ribeiro, Ian Sims
    Pages 43-101
  5. Isabel Fernandes, Maria dos Anjos Ribeiro, Maarten A. T. M. Broekmans, Ian Sims
    Pages 103-159
  6. Isabel Fernandes
    Pages 161-172
  7. Isabel Fernandes
    Pages 173-189
  8. Back Matter
    Pages 191-193

About this book

Introduction

This RILEM AAR 1.2 Atlas is complementary to the petrographic method described in RILEM AAR 1.1. It is designed and intended to assist in the identification of alkali-reactive rock types in concrete aggregate by thin-section petrography. Additional issues include:
• optical thin-section petrography conforming to RILEM AAR 1.1 is considered the prime assessment method for aggregate materials, being effective regarding cost and time. Unequivocal identification of minerals in very-fine grained rock types may however require use of supplementary methods.
• the atlas adheres to internationally adopted schemes for rock classification and nomenclature, as recommended in AAR 1.1. Thus, rock types are classified as igneous, sedimentary or metamorphic based upon mineral content, microstructure and texture/fabric.
• in addition, the atlas identifies known alkali-reactive silica types in each rock type presented. It also identifies consistent coincidence between certain lithologies and silica types; however, it refrains from attributing alkali-reactivity to a specific silica property or quality.
• operator skill and experience remain essential for reliable assessment by thin-section petrography.
• aggregate materials must be classified according to local criteria, based on regional experiences with ASR-damaged field structures and geology. Access to additional data may be relevant for the assessment of imported materials.
• mere application of rock nomenclature does not provide any sort of warranty to the development of deleterious alkali-reaction. Such may result in either rejection of a suitable aggregate material, thus wasting a valuable resource, or acceptance of an unsuitable material leading to concrete damage, both of which are undesirable.

Keywords

Aggregates Alkali-Aggregate Reactivity Concrete and Rock Concrete damage RILEM Thin-section petrography

Editors and affiliations

  • Isabel Fernandes
    • 1
  • Maria dos Anjos Ribeiro
    • 2
  • Maarten A T M Broekmans
    • 3
  • Ian Sims
    • 4
  1. 1.Geology, Faculty of SciencesUniversity of LisbonLisbonPortugal
  2. 2.ICT, Institute of Earth Sciences &DGAOTUniversity of PortoPortoPortugal
  3. 3.Geological Survey of Norway - NGUTrondheimNorway
  4. 4.RSK Environment LtdHemel HempsteadUnited Kingdom

Bibliographic information

  • DOI https://doi.org/10.1007/978-94-017-7383-6
  • Copyright Information RILEM 2016
  • Publisher Name Springer, Dordrecht
  • eBook Packages Engineering
  • Print ISBN 978-94-017-7382-9
  • Online ISBN 978-94-017-7383-6
  • Buy this book on publisher's site