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ADMIXTURES. Chemical admixtures reduce the cost of construction, modify properties of hardened concrete,
ensure quality of concrete during mixing/transporting/placing/curing, and overcome certain emergencies during concrete operations.
Type A: Water-reducing admixtures
Type B: Retarding admixtures
Type C: Accelerating admixtures
Type D: Water-reducing and retarding admixtures
Type E: Water-reducing and accelerating admixtures
Type F: Water-reducing, high range admixtures
Type G: Water-reducing, high range, and retarding admixtures
Chemical admixtures are used to improve the quality of concrete during mixing, transporting, placement and curing. They fall into the following categories:
air entrainers
water reducers
set retarders
set accelerators
superplasticizers
Admixtures are usually stored in bulk, in plastic or metal tanks or in barrels. Modem bulk plastic storage tanks are double-skinned in order to minimize the risk of leakage due to a skin splitting. If double-skinned tanks are not used, the admixture storage area should be bunded in order to prevent any spillage entering the water system.
Admixtures should be protected from freezing, all tanks and pipes should be clearly marked with their contents and the shelf life of the product should be indicated.
Admixture containers should never be left with open tops due to the risk of contamination. Rain can also enter, diluting the product and reducing its effectivness.
If an admixture exceeds its storage life or is no longer required, it must be disposed of through an approved contractor.
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