What is polycarboxylic ether?
Polycarboxylate ether (PCE) comb-copolymers are widely used as water reducing agents in the concrete industry while maintaining a high fluidity via the polymer adsorption to the cement particles. The influence of different structural parameters using well-defined polymeric structures is yet to be explored.
Why superplasticizer can be used for water reducer?
Superplasticizers (SP’s), also known as high range water reducers, are additives used in making high strength concrete. Plasticizers are chemical compounds that enable the production of concrete with approximately 15% less water content. The strength of concrete increases when the water to cement ratio decreases.
What is the difference between water reducer and superplasticizer?
Water Reduction Plasticizer: Plasticizers can reduce the need for water by 5-15%. Superplasticizer: Superplasticizer can reduce the need for water by 30%.
What does a water reducer do?
Water reducers, retarders, and superplasticizers are admixtures for concrete, which are added in order to reduce the water content in a mixture or to slow the setting rate of the concrete while retaining the flowing properties of a concrete mixture.
How do you use Superplasticizers?
Superplasticizers can be used in three ways: to create flowing, self-leveling concrete without increasing water, without reducing cement and without sacrificing strength; to produce workable, high-strength concrete by reducing the water and thus the water-cement ratio; or, to save cement by reducing both the water and …
Are polycarboxylates safe?
In summary, based on the available data, the human risk assessment considers the use of polycarboxylates in household laundry products and automatic dishwashing detergents as safe and of no concern with regard to consumer use.
How much does superplasticizer cost?
concrete. Very low water to cement ratios can be obtained with as much as 25-30% total water reduction. Typical dosage rates approximately 40% less than of standard melamine and naphthalene based superplasticizers, while maintaining the same percent water reduction….OPTIMUM 380 Premium Superplasticizer.
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When would you use a superplasticizer?
What can be used to slow the hardening of concrete?
retarding admixture
Sugar can be added to the concrete to retard hardening. For example, if the concrete needs to be transported a long distance, then a retarding admixture would be desired.
What is difference between plasticizer and admixture?
Plasticizer us in concrete for workability, Strength, and Durability of concrete. Plasticizer in concrete for Water-reducing admixtures usually reduces the required water content for a concrete mixture by about 5 to 12 percent. Water-reducing admixtures that delay the initial setting time by more than three hours.
What is high range water reducer?
High range water reducing admixture reduces the quantity of mixing water required to produce concrete of a given consistency by 12 % or greater, as per ASTM C 494- C 494M. It is capable of producing great water reduction, great flowability, or both.
How long do Superplasticizers last?
Superplasticizers in practice The concrete workability can be maintained for a long period of time (1–2 hours or more), which is beneficial to many processes, including transport, pouring, pumping, compaction, and casting.