Superplasticizer - an overview | ScienceDirect Topics
Superplasticizers are a fundamental ingredient for lowering the yield stress of concrete. This chapter provides an overview of the chemical classes of superplasticizers and their performance, with a selective review of those aspects that we consider important in understanding superplasticizers. We also demonstrate the consistency in findings
Superplasticizers in practice - ScienceDirect
Superplasticizers are essential components of modern concrete, allowing the production of highly durable structures with reduced environmental impact. Their working mechanisms rely on their molecular structures and physical–chemical interactions taking place between them and the surface of cement particles.
Progresses in Synthesis of Polycarboxylate Superplasticizer
Polycarboxylate superplasticizer (PCE) was synthesized by unsaturated monomers of carboxylic acid, alkane macromonomers of long chains, and others. It was an excellent cement dispersant which would make great performance in concrete [ 1 ].
Superplasticizers in practice | Request PDF - ResearchGate
Superplasticizers (SPs) are used to reduce the amount of water required to obtain the desired flow properties of concrete mixtures or maintain the flow properties while reducing the cement...
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.
- What is a superplasticizer used for?
- Superplasticizers are used to increase the fluidity of concrete without adding excess water. These molecules physically separate the cement particles by opposing their attractive forces with steric and/or electrostatic forces, as explained in Chapter 11 (Gelardi and Flatt, 2016). As a result, the concrete is easier to place.
- Are superplasticizers essential components of modern concrete?
- Conclusions Superplasticizers are essential components of modern concrete, allowing the production of highly durable structures with reduced environmental impact. Their working mechanisms rely on their molecular structures and physical–chemical interactions taking place between them and the surface of cement particles.
- Do superplasticizers control workability?
- Therefore, at low w/c and with superplasticizers, it is the effective surface coverage of cement particles by superplasticizers that controls workability (see Section 16.3.1 and Chapter 11 (Gelardi and Flatt, 2016))—something that standard mortar tests are not designed to evaluate.
- Why should a superplasticizer be reduced?
- Higher levels of dispersion may be reached and possible segregation may occur. As a result, in most cases, the superplasticizer dosage should be reduced. This, in turn, would reduce the workability time, so that the final benefits are not obvious. In an earlier section, we mentioned that the mixing process affects the initial fluidity of concrete.
- Are superplasticizers effective in a low dosage regime?
- In other words, in the low dosage regime the impact of superplasticizers is much stronger than assumed from a direct proportionality between yield stress and interparticle forces. This is all the more so, that the volume fraction considered is close to the percolation threshold.
- What are the effects of superplasticizers on ettringite?
- Ettringite is the main hydration product of aluminate minerals. The effects of superplasticizers on the morphology and stability of ettringite are related to the thermal stability of self-stressing cement, as well as fluidity, setting time, strength development, and durability of concrete , .
