Science and Technology of Concrete Admixtures - 1st Edition - Elsevier
eBook ISBN: 9780081006962 Purchase options Select country/region Bundle (Hardcover, eBook)50% Off $570.00 $285.00 $285.00 Available $285.00 eBook Format Help Add to cart Description Science and Technology of Concrete Admixtures presents admixtures from both a theoretical and practical point-of-view.
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 - Hindawi
The usual practice was to esterify and graft polyether into main chains at high temperature. Sun et al. [ 33 ] grafted alkoxyamine as a reactant with PCE in the amount of 10–20% of –COOH mole. The mixture lasted at 150°C for 1.5–3 h, and then some catalyst was added, the mixture was cooled at 100–130°C, and the desired product was obtained.
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...
Influence of PCE superplasticizers on the fresh properties of low
Generally, the strengths of all the blended cement were lower than that of the OPC mortar, especially at early times such as 1; 3 and 7 d. At a curing time of 1 d, the blended cement containing the CCC sample exhibited the highest compressive strength among all blended cements, followed by that of the CCI and CCG containing samples.
- 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.
- Which superplasticizer is more effective?
- Especially PCE-based superplasticizers are more effective as their absorption by blended cement particles is often higher. High performance concrete like Self compacting concrete (SCC), high-fluidity concrete and high-performance concrete can be achieved by using advance superplasticizers. 2.
- 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.
- 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 compatible with SCMS Blended Low carbon cement?
- With expanding cement demand, the need for chemical admixtures has also increased. This comprehensive study focuses on the compatibility of commercially available superplasticizers with SCMs blended low carbon cement and their influence on fresh and hardened properties along with microstructural and durability aspects.
- Why do we use specialized superplasticizers in RC?
- However, the unique properties of RC, such as the high water demand and short setting time, necessitate the use of specialized superplasticizers that are different from those used in ordinary Portland cement. As an important component for the application of RC, superplasticizer has an important impact on the performance modification of RC.
