Lab Services: Aggregate testing

Lab Services: Aggregate testing

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Test Method Title

Standard Test Method for Organic Impurities in Fine Aggregates for Concrete

Reference Number

ASTM C40

Material

Aggregate

Test Property

Injurious organic impurities

Description of Test

The fine aggregate is placed into a glass bottle with a 3% sodium hydroxide solution. The mixture is shaken vigorously and allowed to stand for 24-hours. The color of the supernatant liquid then compared with standard colors. If the color of the solution is darker than the Organic Plate No. 3, the aggregate is considered to contain organic impurities that may be injurious to concrete.

Preferred Test Sample Size

10 kg

Number of Test Specimens

1

Test Specimen Size

400 g

Keywords

Organic, Impurities, Injurious

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