BS 7943:1999

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