Superplasticizers: the wonder of fluid concrete - YouTube
Superplasticizers are used to enhance the fluidity of the concrete without adding water. These molecules physically separate the grains of cement by neutralizing their force of attraction....
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.
Superplasticizer - an overview | ScienceDirect Topics
Superplasticizers are additions that allow a given degree of workability to be obtained at a reduced water/cement ratio. The ratio may be reduced by up to 20% in the presence of, for example, sulphonated naphthalene formaldehyde condensate, which is absorbed at the solid/liquid interface.
Use of Water Reducers, Retarders, and Superplasticizer
Superplasticizers are soluble macromolecules, which are hundreds of times larger than water molecule (Gani, 1997). Mechanism of the superplasticizers is known as adsorption by C 3 A, which breaks the agglomeration by repulsion of same charges and releases entrapped water.
How Super Are Superplasticizers? - Concrete Construction
A superplasticizer is not a cure-all admixture; it has its own problems, which must be taken into account. Nonetheless, dramatic transformation of stiff concrete into flowing concrete by adding superplasticizer instead of water may be the most significant breakthrough in concrete technology since the development of air-entraining agents.
- What is a superplasticizer & how does it work?
- Dispersion of cement particles by superplasticizer. The European Standard NF EN 934-2 presents the superplasticizer as a high-range water reducer and a new generation of plasticizer that greatly decreases the water/cement ratio to increase the workability and mechanical properties of concrete.
- What is a superplasticizer in concrete?
- Superplasticizers allow a 30% or more reduction in water content. It is chemical admixtures that are added to the concrete to improve their flowing ability, they help to reduce the amount of water in the concrete and to improve the strength and durability of concretes. They achieve a reduction in water content without loss of workability.
- What is the difference between a plasticizer and a superplasticizer?
- Plasticizers are chemical compounds enabling the production of concrete with approximately 15% less water content. Superplasticizers allow reduction in water content by 30% or more. These additives are employed at the level of a few weight percent. Plasticizers and superplasticizers also retard the setting and hardening of concrete.
- Can a superplasticizer be used to reduce water content?
- The use of superplasticizers allows this water reduction without affecting workability. Water reduction of up to 30% can be achieved and concrete with a w/c ratio below 0.28 has been placed successfully. Superplasticizers can be used to produce concrete with reduced cement content without changing the w/c ratio.
- What are the effects of superplasticizers?
- At ordinary dosage, the reduction in the water content 5 generally reaches 20%. The effects of superplasticizers depend not only on their nature and dosage but also on many other factors. The type of cement and also the gypsum content affect the admixture effectiveness.
- What is a superplasticizer admixture?
- Superplasticizers are a relatively new category of admixtures utilized for gaining higher strength at lower water/cement ratios. Mostly, these are chemical admixtures and interact with cement. Superplasticizers are chemically different from normal water reducers and are capable of reducing water content up to about 30%.
