ASTM C40

This test method is used in making a preliminary determination of the acceptability of fine aggregates with respect to the requirements of Specification C 33 that relate to organic impurities.

The principal value of this test method is to furnish a warning that injurious amounts of organic impurities may be present. When a sample subjected to this test produces a color darker than the standard color it is advisable to perform the test for the effect of organic impurities on the strength of mortar in accordance with Test Method C 87.

1. Scope

1.1 This test method covers two procedures for an approximate determination of the presence of injurious organic impurities in fine aggregates that are to be used in hydraulic cement mortar or concrete. One procedure uses a standard color solution and the other uses a glass color standard.

1.2 The values given in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents

ASTM Standards
C125 Terminology Relating to Concrete and Concrete Aggregates
C33 Specification for Concrete Aggregates
C702 Practice for Reducing Samples of Aggregate to Testing Size
C87 Test Method for Effect of Organic Impurities in Fine Aggregate on Strength of Mortar
D1544 Test Method for Color of Transparent Liquids (Gardner Color Scale)
D75 Practice for Sampling Aggregates

Index Terms

colorimetric test; fine aggregate; organic impurities; ICS Number Code 91.100.30 (Concrete and concrete products)

Citing ASTM Standards

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