Colour Standard to ASTM C40 (ASTM C40) (LAG206)

Colour Standard to ASTM C40 (ASTM C40) (LAG206)

Stable-coloured, glass standard for long-term use

Code LAG206
Other Standards ASTM C40
Weight (kg) 0.1
Tariff 902480 90
  • The colour standard is designed for quick and accurate tests of organic matter in sand and aggregates for concrete, according to ASTM C-40.
  • Organic impurities, usually in the form of tannic acid and its derivatives, are typically present in fine aggregates such as sand.
  • These may interfere with the chemical reactions of hydration and may affect the strength of the cement, mortar or concrete where the aggregate is being used.
  • The results given by the colour comparison are designed to serve as a warning that unacceptable levels of organic impurities may be present.
  • In the test, a measured sample of fine aggregate is shaken with sodium hydroxide solution in a stoppered bottle and left to stand for 24 hours.
  • The liquid above the test sample develops a colour, which is compared directly with coloured glass standards to indicate the level of organic impurities present.

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