Concrete Admixtures Handbook | ScienceDirect
1 - Concrete Science. This chapter discusses the important aspects of the physical, chemical, durability, and mechanical characteristics of cement paste and concrete that may be influenced by admixtures. Concrete, a composite material made with: (1) cement, (2) aggregates, (3) admixtures, and (4) water, comprises in quantity the largest of all
Superplasticizer - an overview | ScienceDirect Topics
Superplasticizers used in concrete come in four main groups: – Sulfated naphthalene formaldehyde (PNS); – Sulfated melamine formaldehyde (PMS); – Vinyl copolymers (VCPs); – Polycarboxylic ethers (PCEs). 8.2.1 Polynaphthalene sulfonates In 1930, PNS was used for the first time in the manufacture of synthetic rubber and the textile chemicals.
Super-plasticizers In Concrete: Amazon.com: Books
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Effect of Superplasticizer on Fresh and Hardened
Authors: Salahaldein Alsadey Abstract and Figures In recent years, significant attention has been given to use superplasticizer as a chemical admixture on concrete. However, the use of chemical...
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.
- 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.
- How do superplasticizers interact with cement?
- Today, recent results give a better understanding of the interactions between superplasticizers and cement. It is commonly accepted that the adsorption kinetics of superplasticizers on the surface of cement particles is the basis of deflocculation and dispersion of cement grains over time.
- Can superplasticizers improve self-compacting concrete workability?
- Self-compacting concrete workability is usually ensured by the addition of superplasticizers in the mixture. The effects of some properties of superplasticizers have been investigated by many researchers.
- Does superplasticizer admixture affect rheological properties of self-compacting concrete?
- The influence of superplasticizers on cement paste, and on rheological and mechanical properties of self-compacting concrete, are also discussed. Moreover, the effect of dry extract of superplasticizer admixture on the behavior of concrete is included. 8.1. Introduction
- 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 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.
