Standards: ASTM C40 • AASHTO T21

• The Organic Impurities Set is used to detect the presence of deleterious organic compounds in fine aggregates intended for use in hydraulic cement mortar or concrete.
• This preliminary test serves as an indicator of potential organic contamination, which may adversely affect the strength and durability of concrete.
• After the settling period, the color of the supernatant liquid is compared against a standardized color reference chart to assess the presence of organic impurities.
• This method is widely recognized for its simplicity and effectiveness in providing a quick assessment of aggregate quality concerning organic content