What is the difference between plasticisers and superplasticizers?
What is the difference between plasticisers and superplasticizers?
Plasticizer: A plasticizer is an additive used to improve the plasticity of a certain substance. Superplasticizer: Superplasticizer is a water-reducing admixture capable of producing large water reduction or great flowability without causing undue set retardation or entrainment of air in mortar or concrete.
What are superplasticizers made of?
Traditional plasticizers are lignosulphonates as their sodium salt. Superplasticizers are synthetic polymers. Compounds used as superplasticizers include sulfonated naphthalene formaldehyde condensate, sulfonated melamine formaldehyde condensate, acetone formaldehyde condensate and polycarboxylate ethers.
What are admixtures and its types?
Admixtures are classed according to function. There are five distinct classes of chemical admixtures: air-entraining, water-reducing, retarding, accelerating, and plasticizers (superplasticizers).
What are the examples of admixtures?
There are two types of admixtures, viz., chemical admixtures and mineral admixtures. Accelerators, Retarders, Water-reducing agents, Super plasticizers, Air entraining agents etc. are the commonly used chemical admixtures. Fly-ash Blast-furnace slag, Silica fume and Rice husk Ash are the examples of mineral admixtures.
How much is a superplasticizer?
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What is the purpose of superplasticizer?
Superplasticisers are commonly used in dry-pressed concrete to improve the workability and to enhance the compaction of concrete for increasing density and to improve the surface finish of the concrete product.
What are the disadvantages of superplasticizers?
The main disadvantage of superplasticizer usage is loss of workability as a result of rapid slump loss and incompatibility of cement and superplasticizers. Superplasticizers are soluble macromolecules, which are hundreds of times larger than water molecule (Gani, 1997).
What are the commonly used admixtures?
15 Types of Admixtures Used in Concrete
- Water Reducing Admixtures.
- Retarding Admixtures.
- Accelerating Admixtures.
- Air Entraining Concrete Admixture.
- Pozzolanic Admixtures.
- Damp-proofing Admixtures.
- Gas forming Admixtures.
- Air detraining Admixtures.
Why is admixture used?
Admixtures are used in concrete to alter its properties in various ways. Some common uses include improving workability, increasing or decreasing cure time, and increasing concrete strength. Admixtures can also be used for aesthetic reasons, such as to change the color of the cement.
What are the two types of admixtures?
Concrete admixtures are used to improve the behavior of concrete under a variety of conditions and are of two main types: Chemical and Mineral.
