Concrete Admixtures: Super plasticizers

concrete admixtures: 

super plasticizers

The main purpose of using super plasticizers is to produce flowing concrete with a high slump in the range of 7-9 inches to be used in heavily reinforced structures and in placements where adequate consolidation by vibration cannot be readily achieved. The other major application is the production of high-strength concrete at w/c's ranging from 0.3 to 0.4. It has been found that for most types of cement, super plasticizer improves the workability of concrete. One problem associated with using a high range water reducer in concrete is slump loss. High workability concrete containing super plasticizer can be made with a high freeze-thaw resistance, but air content must be increased relative to concrete without super plasticizer.

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