Materials | Free Full-Text | Advances in Organic Rheology-Modifiers
Organic rheology modifiers, especially superplasticizers and viscosity-modifying admixtures (VMAs), have become key components for the workability optimization of modern concrete. The development of these admixtures is crucial to the further performance improvement of modern concrete under different casting and service conditions. Many of the former reviews have summarized research advances in
Buildings | Free Full-Text | Performance and Compatibility of
The main properties of the NSF and PCE-based superplasticizers are summarized in Table 2. Concretes with w/c ratio equal to 0.52 and with a cement content of 325 kg/m 3 were manufactured. The concrete mix composition is shown in Table 3. Particle size distribution of aggregates is shown in Figure 1.
Applied Sciences | Free Full-Text | Effect of Functional
The hydration rate, hydration products, and pore structure of the concrete containing different functional polycarboxylic acid superplasticizers were analyzed by means of mercury intrusion test, scanning electron microscopy (SEM), and X-ray diffraction (XRD).
Superplasticizers for Concrete - MDPI
for concrete with higher efciency in terms of water reduction with respect to polycarboxilate-based admixtures and characterized by a higher compatibility upon different cement types/production batches than NSF-based admixtures. 2. Materials and Methods Concrete mixes manufactured by using 13 different cement types produced by different cement
Materials | Free Full-Text | Concrete Strengthening by
The review specifically concerns superplasticizers, latexes, redispersible powders, admixtures to enhance crack resistance, fibres and recycled polymers that can play the role of the additives in concrete-based composites.
- Do superplasticizers improve the fluidity of concrete?
- 5. Conclusions Superplasticizers are chemical additives that can significantly improve the fluidity of concrete. They work by reducing the surface tension between cement particles and water, thereby reducing the amount of water required to improve the workability of concrete.
- Can superplasticizers reduce the environmental impact of concrete construction?
- An important consequence of the above is that superplasticizers can be used to reduce the environmental impact of concrete construction by reducing the cement content per cubic meter of concrete (see Preface).
- What are the different types of superplasticizers used in concrete?
- With the gradual enrichment of the types of concrete, the types of superplasticizers have also increased, and naphthalene superplasticizers and polycarboxylic acid superplasticizers are beginning to be widely used in concrete [27, 28].
- What is a superplasticizer used for?
- Superplasticizers (SPs), also known as high range water reducers, are additives used for making high strength concrete or to place self-compacting concrete. Plasticizers are chemical compounds enabling the production of concrete with approximately 15% less water content. Superplasticizers allow reduction in water content by 30% or more.
- Can superplasticizers be used in concrete with a low W/C ratio?
- Among the documented cases, it can be stated that the use of superplasticizers in concrete having a low w/c ratio enhances possible problems. Unfortunately, the workability tests used to qualify cements are done on mortars without admixture under standard conditions, implying the use of a high w/c ratio of 0.50 (ASTM C109).
- Does PCE superplasticizer adsorb in concrete?
- The adsorption of PCE superplasticizer in a concrete mix was found to be higher than in a cement paste mixed at 700 rpm with identical mixing time, W/C and dosage. However, the relative differences of adsorbed masses of the different PCEs measured in the cement paste correlated with the results from concrete.
