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.
ADVA 198 Data Sheet | Resource | GCP Applied Technologies
ADVA 198 superplasticizer is a polycarboxlate-based high-range water-reducing admixture specifically formulated to meet the needs of the concrete industry. It is a low viscosity liquid, which has been formulated by the manufacturer for use as received.
Superplasticizer: Types, Advantages & Disadvantages
Superplasticizers (SPs) are also known as high- range water reducers that are additive used in making high strength concrete. Plasticizers are chemical compounds that enable the production of concrete with approximately 15% less water content. Superplasticizers allow a 30% or more reduction in water content.
The 23 types of Concrete Admixtures（Additives）used in Concrete
Common water-reducing agent is a wood quality sulfonate of chemicals. When added to concrete, it can produce the desired slump in a case where the water-cement ratio lower than usual design. It usually reduces the required water content of the concrete mixture by about 5% to 10%.
Use of Water Reducers, Retarders, and Superplasticizer
Dosage needed for a concrete mixture is unique and determined by the Marsh Cone Test. There are four types of superplasticizers: sulfonated melamine, sulfonated naphthalene, modified lignosulfonates and a combination of high dosages of water reducing and accelerating admixtures.
- How naphthalene based superplasticizers increase compressive strength according to Abram's law?
- Compressive strength according to Abram’s law is increased with reduction in water/ cement (w/c) ratio inferring that water reduction leads to compressive strength Naphthalene based superplasticizers have been in use since 1930 , they are produced from naphthalene by oleum or sulfur trioxide sulfonation of the β- sulfonate .
- How much water does naphthalene based superplasticizer reduce W/C ratio?
- The average water reduction of Naphthalene based superplasticizer is 26 within 0.3 – 0.5 w/c ratio on cement paste dosage . In another study, the addition of ammonium salt of Naphthalene formaldehyde lead to the decrease of w/c ratio from 0.25 to 0.21 in .
- Are naphthalene based superplasticizers still used today?
- Despite the long history and the advent of polycarboxylates superplasticizers, naphthalene based super plasticizers (SNF) are still in use today with brands being produced with refinements through research aimed at improving their performance. In a study carried out in , it was observed increase.
- How is superplasticizer applied to concrete?
- Superplasticizer was applied to concrete in two processes: addition of Superplasticizer to 25% of the gauging water adding remaining of gauging water by trials till a constant consistence is reached (CCC process) and by partial reduction of gauging water by amount of superplasticizer added (RGW process).
- What is naphthalene based superplasticizer (SNF)?
- Naphthalene based superplasticizer (SNF) is produced from naphthalene by oleum or sulfur trioxide sulfonation of β sulfonate. Subsequent reaction with formaldehyde leads to polymerization and the sulfonic acid as shown in Figure 1. It is then neutralized with a suitable alkali and filtration to eliminate calcium sulfate . Figure 1.
- What are superplasticizers-polymer additives?
- Superplasticizers-polymer additives are widely used to increase the plasticity of concrete materials without reducing their strength. In terms of chemical plasticizers, the products are formaldehyde condensate of naphthalene sulfonic acid, melamine-formaldehyde condensate, and products of modification lignosulfonates [3, 4].
