Use of Water Reducers, Retarders, and Superplasticizer
There are four types of superplasticizers: sulfonated melamine, sulfonated naphthalene, modified lignosulfonates and a combination of high dosages of water reducing and accelerating admixtures. Commonly used are melamine based and naphthalene based superplasticizers.
Chemical Admixtures - Cement
Superplasticizers, also known as plasticizers or high-range water reducers (HRWR), reduce water content by 12 to 30 percent and can be added to concrete with a low-to-normal slump and water-cement ratio to make high-slump flowing concrete. Flowing concrete is a highly fluid but workable concrete that can be placed with little or no vibration or
MasterPolyheed 8126
superplasticizer developed primarily for use in pumped concrete. It contains polycarboxylate ether polymers and is specially formulated to give exceptionally high water reduction and significantly improved slump retention compared to conventional superplasticizer. MasterPolyheed 8126 is free of chloride and has
Study on performance stability of Polycarboxylate
The effects of initial dropping temperature, amount of ferrous sulfate and dropping time on the performance of Polycarboxylate Superplasticizer were studied, and the measures to maintain the...
Application of viscosity-reducing Polycarboxylate
Using 3-methyl-3-buten-1-ol polyoxyethylene ethers (the TPEG), acrylic acid (AA), methyl acrylate (MA) monomer, ammonium persulfate (APS) and hydrogen peroxide Vitamin C- (Vc-H 2 O 2 ) composite...
- Do superplasticizers improve the fluidity of concrete?
- 5. Conclusions Superplasticizers are chemical additives that can significantly improve the fluidity of concrete. They work by reducing the surface tension between cement particles and water, thereby reducing the amount of water required to improve the workability of concrete.
- What is a superplasticizer in cement?
- According to ASTM C494, superplasticizers are linear polymers that possess a sulfonic acid group. The addition of superplasticizers into a mix neutralizes the surface interaction among the cement particles and thus, reduces the viscosity of cement paste (free from agglomeration) resulting in reduced pore volume.
- How do superplasticizers work?
- They work by reducing the surface tension between cement particles and water, thereby reducing the amount of water required to improve the workability of concrete. The potential superplasticizers for RC have been reviewed, discussed, and compared in this paper.
- How do superplasticizers affect the workability of concrete?
- Superplasticizers directly influence the workability of concrete, and certain factors are considered such as type of admixture, time of addition, addition sequence, mixing time, dosage, w/b ratio, and amount/nature of binder. The dosage between 0.6 to 2% by weight of cement resulted in minimal retardation.
- Why do you need A superplasticizer?
- They help to obtain concrete with higher tolerance to slight changes in the water content, and reduce bleeding and segregation if either superplasticizer is overdosed or the water content is too high.
- Which superplasticizer admixture is better?
- Based on the findings, out of three superplasticizers, PC—based admixture showed a better improvement in strength aspects compared to other mix. Compressive strength of UHPC (a) SNF admixture (b) SMF admixture (c) PC admixture
