Petrographic Atlas: Characterisation of Aggregates Regarding Potential Reactivity to Alkalis (eBook)

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 (Herausgeber)

eBook Download: PDF

2016 | 1st ed. 2016
XI, 193 Seiten
Springer Netherland (Verlag)
978-94-017-7383-6 (ISBN)

Infos

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.

Inhalt

Foreword 5
Acknowledgments 7
Contents 9
Abbreviations 10
1 Introduction 11
1.1ƒSample Materials 12
1.2ƒDisclaimer 13
1.3ƒMaterials and Methods 13
1.3.1 General Considerations 13
1.3.2 Specimen Preparation and Analysis 14
1.3.3 Thin Section Petrography 14
1.4ƒOrganization of the Atlas 14
1.5ƒSummary 16
References 16
2 Igneous Rocks 18
References 19
3 Sedimentary Rocks 51
References 52
4 Metamorphic Rocks 110
References 111
5 Characteristic Examples of Reactive Silica 167
References 168
6 Examples of ASR in Selected Rock Types 179
References 179
Bibliography 196

Produkt-Details

• Erscheint lt. Verlag: 18.3.2016
• Zusatzinfo: XI, 193 p. 504 illus., 37 illus. in color.
• Verlagsort: Dordrecht
• Sprache: englisch
• Themenwelt: Naturwissenschaften ► Geowissenschaften ► Geologie
• Themenwelt: Naturwissenschaften ► Geowissenschaften ► Meteorologie / Klimatologie
• Themenwelt: Technik ► Bauwesen
• Themenwelt: Technik ► Maschinenbau
• Schlagworte: aggregates • Alkali-Aggregate Reactivity • Concrete and Rock • Concrete damage • RILEM • Thin-section petrography
• ISBN-10: 94-017-7383-1 / 9401773831
• ISBN-13: 978-94-017-7383-6 / 9789401773836