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BSI
BS 7943:1999

BS 7943:1999

Current

Current

The latest, up-to-date edition.

Guide to the interpretation of petrographical examinations for alkali-silica reactivity

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

15-07-1999

Publisher

British Standards Institution

Foreword
1 Scope
2 Characteristics of UK aggregates
3 Classification of aggregates
Annex A (informative) precision of the procedure for qualitative and
quantitative petrographic examination of aggregates
Annex B (informative) Gel-pat test for the detection of opaline silica
Annex C (informative) Example of report form
Bibliography
Figure B.1 Typical pat specimen at the end of a test, showing several
           gel growths - specimen immersed in the storage solution
Figure B.2 Typical pat specimen at the end of a test, showing several gel
           growths - specimen removed from the storage solution but kept wet
Figure B.3 Typical pat specimen at the end of a test, showing several gel
           growths - an oblique view of the pat after drying in ambient conditions
Table 1 - Guidance on rock types
Table 2 - Guidance on mineral types
Table B.1 - Detection limits for the gel-pat test

Applies to coarse and fine aggregates as specified in BS 812-104.

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 812-104, 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 petrographical examination of coarse and fine aggregates, carried out in accordance with BS 812-104, is given in annex A.

NOTE 2 It is recommended that a petrographical examination be earned out by a petrographer who is a member of the Proficiency Scheme for Aggregate Petrographers.

Committee
B/502
DevelopmentNote
Supersedes 98/101379 DC. (05/2005) Reviewed and confirmed by BSI, March 2008. (02/2008)
DocumentType
Standard
Pages
20
PublisherName
British Standards Institution
Status
Current
Supersedes

14/30291598 DC : 0 BS 8500-2 - CONCRETE - COMPLEMENTARY BRITISH STANDARD TO BS EN 206 - PART 2: SPECIFICATION FOR CONSTITUENT MATERIALS AND CONCRETE
PD 6682-9:2003 Aggregates Guidance on the use of European test method standards
S.R. 24:2004 GUIDANCE ON THE USE AND APPLICATION OF EUROPEAN TEST METHOD STANDARDS FOR AGGREGATES
11/30241319 DC : 0 BS 8500-2 + A1 - CONCRETE COMPLEMENTARY BRITISH STANDARD TO BS EN 206-1 - PART 2: SPECIFICATION FOR CONSTITUENT MATERIALS AND CONCRETE
BS 8500-2(2015) : 2015 CONCRETE - COMPLEMENTARY BRITISH STANDARD TO BS EN 206 - PART 2: SPECIFICATION FOR CONSTITUENT MATERIALS AND CONCRETE
BS 8500-2(2006) : 2006 CONCRETE - COMPLEMENTARY BRITISH STANDARD TO BS EN 206-1 - PART 2: SPECIFICATION FOR CONSTITUENT MATERIALS AND CONCRETE

BS 882:1992 Specification for aggregates from natural sources for concrete
BS 812-104:1994 Testing aggregates Method for qualitative and quantitative petrographic examination of aggregates
BS 5328:1981 Methods for specifying concrete, including ready-mixed concrete
BS 812-123:1999 Testing aggregates Method for determination of alkali-silica reactivity. Concrete prism method

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Hardcopy - English
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