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Superplasticizer
Superplasticizers, also known as high range water reducers, are chemical admixtures used where well-dispersed particle suspension is required. These polymers are used as dispersants to avoid particle segregation(gravel,coarse and fine sands), and to improve the flow characteristics (rheology) of suspensions such as in concrete applications. Their addition to concrete or mortar allows the reduction of the water to cement ratio, not affecting the workability of the mixture, and enables the production of self-consolidating concrete and high performance concrete.This effect drastically improves the performance of the hardening fresh paste. The strength of concrete increases when the water to cement ratio decreases. However, their working mechanisms lack a full understanding, revealing in certain cases cement-superplasticizer incompatibilities.〔Ramachandran, V.S. (1995) (Concrete Admixtures Handbook – Properties, Science, and Technology ), 2nd Edition, William Andrew Publishing, ISBN 0-8155-1373-9 p. 121〕
The addition of superplasticizer in the truck during transit is a fairly new development within the industry. Admixtures added in transit through automated slump management systems, such as (Verifi ), allows concrete producers to maintain slump until discharge without reducing concrete quality.
==Polycarboxylate ether superplasticizer==
The new generation of this kind of admixtures is represented by polycarboxylate ether-based superplasticizers (PCEs). With a relatively low dosage (0.15–0.3% by cement weight) they allow a water reduction up to 40%, due to their chemical structure which enables good particle dispersion.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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