What is the use of superplasticizer?
Superplasticizers (SPs), 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. Superplasticizers allow reduction in water content by 30% or more.
How is polycarboxylate made?
Polycarboxylates are linear polymers with a high molecular mass (Mr ≤ 100 000) and with many carboxylate groups. They are polymers of acrylic acid or copolymers of acrylic acid and maleic acid. The polymer is used as the sodium salt (see: sodium polyacrylate).
What is PCE superplasticizer?
Bisley supplies Polycarboxylate ( PCE ) in both liquid and powder forms. PCE superplasticiser is a high molecular weight surfactant polymer for use in cementitious systems.
What are the advantages and disadvantages of superplasticizer in concrete?
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- Superplasticizers reduces the water content.
- It reduces the cement content.
- Also, increases the workability of concrete.
- It reduces the permeability of concrete.
- They are easy to placement.
- Increased long terms.
- It develops the early strength.
How do superplasticizers increase workability?
Workability is greatly enhanced by delayed addition of the superplasticiser, rather than adding it with the mixing water. This allows time for the normal reactions between gypsum and clinker to occur without competition from the superplasticiser.
Is polycarboxylate toxic?
Although polycarboxylates are not readily biodegraded in sewage treatment plants, surface water and the soil, they generally have extremely low toxicity. Polycarboxylates are toxic to warm blooded animals only in very high doses.
Is superplasticizer a retarder?
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 does a superplasticizer affect the slump of concrete?
Superplasticizers, when added to fresh concrete, cause large increases in its slump. However, this increase in slump is not sustained over long periods and within 60 minutes or so the concrete reverts to its original slump. This was followed by additional mixing for 2 minutes.
What is naphtha based admixture?
Product Description. Naphtha Formaldehyde Based Admixture is a high range, low dosage, super plasticising admixture for slump retention. It is a product based on refined Naphthalene formaldehyde blends.
How do you make a computer superplasticizer?
Polycarboxylate Superplasticizer (PC-P) is free-flowing and spray dried powder, affords excellent control over initial and final setting times….Specifications.
| Items | Specification |
|---|---|
| Solid Content, % | 98.0 ±1.0 |
| Solubility | Water soluble |
| Performance | Dosages for P.O 42.5 Standard Cement: (wt% of cement) |
| 0.2±0.02 |