AS 1141.26:2019

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Methods for sampling and testing aggregates – Secondary minerals content in igneous rocks

Published By	Publication Date	Number of Pages
AS	2019-12-20	16

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Categories: 91.100.15 - Mineral materials and products, AS

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Description

The objective of this Method is to provide a microscopic procedure for determining the percentage of secondary minerals, including deuteric minerals, present in igneous rocks.

Scope

This Method sets out the method for determining the content of secondary or deuteric minerals of rock spalls, bore cores and aggregates of igneous rocks using a petrological microscope.
This Method is not applicable to rocks that have developed a clearly identifiable metamorphic texture or mineral assemblage, or to sedimentary rocks.
NOTE 1 As secondary minerals are not necessarily deleterious, the method should not be used alone to provide a measure of the quality of the source rock or product.
NOTE 2 The method is suitable for continuing routine assessment of known rock sources as confirmation that the extent and type of secondary minerals have not changed significantly and do not exceed accepted specification limits.
This Method should not be used —
(a) to investigate new rock sources or for previously unknown rock types in known sources;
(b) to investigate other properties of rocks which may limit engineering applications (e.g. potential alkali aggregate reactivity or respirable silica content);
(c) to investigate failures; or
(d) when the genesis of the rock is unclear (e.g. is a deep seated rock type considered a melt or a high grade metamorphic).
In all these cases a more detailed petrological method is recommended.
NOTE 3 Throughout most of Australia the procedure of ASTM C-295 is usually employed.

Additional information

Published Code	AS
Published By	Australia Standards
Publication Date	2019-12-20
Pages Count	16
Language	English
Edition	3
File Size	419.8 KB
ISBN	9781760726829
ICS Codes	91.100.15 - Mineral materials and products

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AS 1141.26:2019

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