If aggregate contains organic impurities it may not be suitable for inclusion in concrete. Organic impurities, usually tannic acid and its derivatives, may interfere with the chemical reactions of hydration. Impurities are more likely to be found in fine (sand) aggregate.
|42-3000||Glass Bottle||info »|
|42-3040||Colour Standard||info »|
The soundness of aggregates to physical changes caused by the environment is important to the long-term durability characteristics of concrete. Excessive changes in volume can be caused by freezing and thawing, thermal changes at temperatures greater than freezing, and cycles of wetting and drying. Hydrometers and Wire Baskets see Laboratory Equipment Section.
|81-4819||Wire Basket - 150 μm wire mesh||info »|
|81-4821||Wire Basket - 600 μm wire mesh||info »|
|81-4823||Wire Basket - 1.18 mm wire mesh||info »|
|81-4825||Wire Basket - 3.35 mm wire mesh||info »|
|82-3505||Hydrometer used with sodium sulphate method||info »|
|82-3510||Hydrometer used with magnesium sulphate method||info »|