Effectiveness of Polycarboxylate Superplasticizers in Ultra-High
Effectiveness of Polycarboxylate Superplasticizers in Ultra-High Strength Concrete: The Importance of PCE Compatibility with Silica Fume Johann Plank1, Christof Schroefl2, Mirko Gruber2, Matthias Lesti3and Roland Sieber4 Received 23 October 2008, accepted 14 January 2009 Abstract
Effectiveness of Polycarboxylate Superplasticizers in Ultra-High
Mechanistic investigations revealed that in cement pore solution, the surface charge of silica fume becomes positive by adsorption of Ca 2+ onto negatively charged silanolate groups present on the silica surface. This way, polycarboxylate copolymers adsorb to and disperse silica fume grains.
Effectiveness of Polycarboxylate Superplasticizers in Ultra-High
Effectiveness of Polycarboxylate Superplasticizers in Ultra-High Strength Concrete: The Importance of PCE Compatibility with Silica Fume J. Plank, C. Schroefl, +2 authors R. Sieber Published 26 February 2009 Materials Science, Engineering Journal of Advanced Concrete Technology
Preferential adsorption of polycarboxylate superplasticizers on cement
Polycarboxylate 1. Introduction The main characteristics of ultra-high performance concrete (UHPC) are a granulometrically optimized packing density of the matrix, a very low water/cement ratio of below 0.25 and an extraordinarily high compressive strength of more than 150 MPa [1].
Action Mechanism of Superplasticizer in Consideration of Early
Effectiveness of Polycarboxylate Superplasticizers in Ultra-High Strength Concrete: The Importance of PCE Compatibility with Silica Fume Johann Plank, Christof Schroefl, Mirko Gruber, Matthias Lesti, Roland Sieber Journal of Advanced Concrete Technology,volume ( ), pp.7 2009 5-12
- Are polycarboxylate superplasticizers effective in ultra-high strength concrete?
- Effectiveness of Polycarboxylate Superplasticizers in Ultra-High Strength Concrete: The Importance of PCE Compatibility with Silica Fume Methacrylate ester as well as allylether based polycarboxylates (PCEs) were synthesized to plasticize pastes of cement and silica fume having a water/cement ratio of 0.22.
- Do polycarboxylate-based superplasticizers influence the performance of UHPC?
- In this research, different investigative methods were employed to study the influence of polycarboxylate-based superplasticizers (PCs) on the performance of UHPC. The potential interaction of PC with cement and fine pozzolans was explored. Three PCs, three cements, and three pozzolans typically used in the design of UHPC were selected.
- What is ultra-early strength type polycarboxylate superplasticizer?
- In this study, a ultra-early strength type polycarboxylate superplasticizer (ES) was synthesized successfully by a design molecule structure such as introducting ultra long polyoxyethlene side chains, functional monomer (2-acrylamide-2-methylpropanesulfonic acid), and cationic monomer (Methacrylatoethyl trimethyl ammonium chloride) composition.
- Do allylether-based PCE adsorb polycarboxylate superplasticizers on silica fume?
- For optimum dispersion of the cement/silica blend present in UHPC, a combination of selectively adsorbing polycarboxylate superplasticizers is more effective than individual polymers. Our study demonstrates that the allylether-based PCE sample used here preferably adsorbs on silica fume.
- How do polycarboxylate copolymers adsorb silica fume?
- Mechanistic investigations revealed that in cement pore solution, the surface charge of silica fume becomes positive by adsorption of Ca2+ onto negatively charged si- lanolate groups present on the silica surface. This way, polycarboxylate copolymers adsorb to and disperse silica fume grains.
- Are allylether based polycarboxylates better than methacrylate ester?
- Methacrylate ester as well as allylether based polycarboxylates (PCEs) were synthesized to plasticize pastes of cement and silica fume having a water/cement ratio of 0.22. Methacrylate ester copolymers were found to disperse cement well, whereas allylether copolymers are more effective with silica fume.
