Abstract： AS 1141.34:2018 pdf download.Methods for sampling and testing aggregates Method 34: Organic impurities other than sugar. 2 Principle The test relies on the reaction of humus material with a sodium hydroxide solution to produce a dark colour...

AS 1141.34:2018 pdf download.Methods for sampling and testing aggregates Method 34: Organic impurities other than sugar.

2 Principle

The test relies on the reaction of humus material with a sodium hydroxide solution to produce a dark colour in the liquid the

intensity of which is approximately proportionate with the mass content of humus in the line aggregate. Based on 1917 research,

fine aggregate with humus contents that have a resultant solution colour lighter than, or equal to, the Standard colour are

expected to have no detrimental effects when used in concrete or mortar products. A darker coloured solution may be the result of

humus content and/or reactions from other contaminents and may require further investigation to determine the extent of possible

effects to concrete or mortar properties.

3 Normative references

The following documents arc referred to in the text in such a way that some or all of their content constitutes requirements of

this document.

AS 1141.2, Methods for sampling and testiIg aggregates. Part 1: Definitions

AS 11412. Methods for sampling and test tig aq,gregates. Method 2: Basic testing equipment

AS 1141.3.1, Met hods for sampling and testing aggregates. Method 3.1: Sampling Aggregates

4 Definitions

For the purpose of this Standard the definitions In AS 1141.1 apply.

5 Safety precautions

Procedures using strong alkalis, including the preparation of dilute solutions of these chemicals, should be carried out with care.

WARNING — STRONG ALKALIS ARE HAZARDOUS AND CAN RESULT IN OFTEN IRREVERSIBLE DAMAGE TO THE SKIN OR EYES. INGESTION OF THE CHEMICAL, INHALATION OF THE FUMES, OR SKIN CONTACT CONSTITUTES A SI:RI0US HEAlTH HAZARD.

Appropriate documentation should be consulted as to safety precautions.

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