Saturation point of superplasticizers determined by
The materials employed were Portland cement, pozzolana and three types of superplasticizers: poly naphthalene sulfonate (PNS), poly melamine sulfonate (PMS) and a polycarboxylate. The saturation point of each superplasticizer was determined in pastes by rheological tests using a coaxial cylinder rheometer AR2000.
Effects and mechanism of superplasticizers and precursor
From Fig. 4, the saturation point of each superplasticizer was obtained according to the maximum fluidity and then the rheological test and particles packing test were carried out based on the saturation point.
Saturation Point of Superplasticizers Determined by
The saturation point of each superplasticizer was determined in pastes by rheological tests using a coaxial cylinder rheometer AR2000. Self-compacting concretes were prepared using the...
Performance of sustainable SCC mixes with mineral additions
A new approach for determining the saturation point of superplasticizers is introduced. The fresh state performance was assessed by means of the following tests: slump flow, V-funnel, and J-ring.
Analytical method for determining the saturation point
The SPS is determined by methods that use the angles defined by the slope of the flow curve, which are obtained through geometric and visual resources. However, depending on the curve shape,...
- What is the optimum dosage of superplasticizer additives?
- The optimum dosage of superplasticizer (SP) additives is determined by the saturation point of SP (SPS), obtained on cement paste by the utilization of the Marsh cone.
- Why is the type and dosage of superplasticizer important?
- The type and dosage of superplasticizer are very important to enable the most stable fluidity. For different dosages of superplasticizer in relation to cement mass, the variation of flow time is presented in Fig. 8.12. Figure 8.12.
- What determines the rheological behavior of a cement-superplasticizer combination?
- The obtained curve indicates two essential points that govern the rheological behavior of the cement–superplasticizer combination studied: (1) the critical dosage corresponding to the saturation point [deviation of the curve: flow time=f (superplasticizer dosage)] is in the order of 1%.
- Do superplasticizers compete with sulfate ions?
- It should be noted that the superplasticizers have a preferential selective adsorption on the aluminate phases of cements (C 3 A and C 4 AF) and thus compete with the sulfate ions (gypsum, hemihydrate, and anhydrite).
- What is a superplasticizer & how does it work?
- Dispersion of cement particles by superplasticizer. The European Standard NF EN 934-2 presents the superplasticizer as a high-range water reducer and a new generation of plasticizer that greatly decreases the water/cement ratio to increase the workability and mechanical properties of concrete.
- 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.
