A novel kind of concrete superplasticizer based on lignite
Superplasticizers facilitate the reduction of the water-to-cement ratio, thus enabling the production of concrete with higher strength and durability. Since the invention of superplasticizers in the 1960s, this group of chemical admixtures experienced a rapid growth.
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.
Superplasticizers and Other Chemical Admixtures in Concrete
Amphoteric Superplasticizers for Cements Blended with a Calcined Clay by Marlene Schmid, Nancy Beuntner, Karl-Christian Thienel, and Johann Plank SP-329-05 55 PCE Superplasticizers Used as Dispersants in Oil Well Cementing by B. Yu, M. Moumin, and J. Plank SP-329-06 67 Nucleation and Growth of C-S-H – PCE Used as Strength Enhancer in Cement
Superplasticizers in practice | Request PDF - ResearchGate
Superplasticizers are essential components of modern concrete, allowing the production of highly durable structures with reduced environmental impact. Their working mechanisms rely on their...
Current Effects of Naphthalene Based Superplasticizer’s
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).
- 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.
- 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.
- 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.
- What makes a superplasticizer a successful water reducing agent?
- In the European project SUPERPLAST we produced superplasticizers with varied architectures and we have been able to show the important structural features of the macromolecules that lead to a successful superplasticizer or water reducing agent. Both polycarboxylate and lignosulfonate polymers have been investigated.
- Are superplasticizers compatible with cement?
- Beyond these process parameters, the only real leverage on these superplasticizers is their molecular mass, in the range of 32–75 kD in the case of PNS (Spiratos et al., 2003). This only leaves a narrow range of variations, so that incompatibilities with cement should come mainly from the cement.
- Do superplasticizers affect rheological properties of cementitious materials?
- The effect of superplasticizers on the rheological properties of cementitious materials is strongly linked to the amount of polymer adsorbed onto the surface of cement particles (Schober and Flatt, 2006, Winnefeld et al., 2006) (Figure 16.3). Figure 16.3.
