Lab Services: Aggregate testing

Back to Search

Test Method Title

Organic Impurities in Fine Aggregates for Concrete

Reference Number

AASHTO T 21

Material

Aggregate

Test Property

Organic content

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

Number of Test Specimens

1

Test Specimen Size

450 g

Keywords

Organic, Impurities