The effect of condensed silica fume on the rheological behaviour of cement pastes

1990 ◽  
pp. 33-36
Keyword(s):  
Silica Fume ◽  
Rheological Behaviour ◽  
Cement Pastes ◽  
Condensed Silica Fume

Rheological behaviour of fresh cement pastes: Influence of synthetic zeolites, limestone and silica fume

2014 ◽  
Vol 63 ◽  
pp. 38-45 ◽  
Author(s):  
Noemi Baldino ◽  
Domenico Gabriele ◽  
Francesca R. Lupi ◽  
Lucia Seta ◽  
Raffaele Zinno
Keyword(s):  
Silica Fume ◽  
Rheological Behaviour ◽  
Cement Pastes ◽  
Synthetic Zeolites

Special Binding for Refractory Concretes

2019 ◽  
Vol 17 (17) ◽  
pp. 11-16
Author(s):  
Elena Valentina Stoian ◽  
Dan Nicolae Ungureanu ◽  
Florin Toma ◽  
Alexandru Gabriel Colţa ◽  
Daniel Anculescu ◽  
...  
Keyword(s):  
Silica Fume ◽  
Ph Value ◽  
Concrete Structures ◽  
Hydrated Alumina ◽  
Binding System ◽  
Hydraulic Binder ◽  
Aluminous Cement ◽  
Mechanical Strengths ◽  
Condensed Silica Fume ◽  
New System

AbstractThe paper shows data related to coexistence of various binding systems, which could be present during the hardening of special concretes. It is taken into account the Ultra Low Aluminous Cement Concretes additivated with different materials (phosphates and mineral ultra dispersed powders - Condensed Silica Fume, Hydrated Alumina etc). In correlation to the pH-value, these substances can favour the forming of new binding systems besides the hydraulic binder (which is not important in this case). The new system is the coagulation binding form. The coagulation binding system has a very important role in the advanced compactness and in the increasing mechanical strengths of concrete structures.

Interaction Between Naphthalene Sulfonate and Silica Fume in Portland Cement Pastes

1987 ◽  
Vol 114 ◽  
Author(s):  
Sidney Diamond ◽  
Leslie J. Struble
Keyword(s):  
Portland Cement ◽  
Silica Fume ◽  
Cement Paste ◽  
Uv Spectrophotometry ◽  
Residual Concentration ◽  
Cement Pastes ◽  
High Ph ◽  
Substantial Concentration ◽  
Low Dosage

ABSTRACTPortland cement pastes were mixed with predissolved naphthalene sulfonate superplasticizer at normal water:cement ratios. Solutions were separated from the fresh pastes at intervals and the residual concentration of the superplasticizer determined by UV spectrophotometry. At low dosage levels essentially all of the superplasticizer was found to be removed from solution within a few minutes; at high dosage levels a substantial concentration was maintained in solution at least to approximately the time of set. In pastes in which silica fume replaced 10% by weight of the cement, it was found that the incorporation of silica fume significantly increased the uptake of superplasticizer. In separate trials it was found that the silica fume by itself adsorbed little superplasticizer, even from high pH solution simulating that of cement paste.

High Performance Concrete with Ternary Binders

2018 ◽  
Vol 761 ◽  
pp. 120-123 ◽  
Author(s):  
Vlastimil Bílek ◽  
David Pytlík ◽  
Marketa Bambuchova
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Silica Fume ◽  
High Performance ◽  
Ordinary Portland Cement ◽  
High Performance Concrete ◽  
Fresh Concrete ◽  
Binder Ratio ◽  
Water To Binder Ratio ◽  
Condensed Silica Fume

Use a ternary binder for production of a high performance concrete with a compressive strengths between 120 and 170 MPa is presented. The water to binder ratio of the concrete is 0.225 and the binder is composed of Ordinary Portland Cement (OPC), condensed silica fume (CSF), ground limestone (L), fly ash (FA) and metakaoline (MK). The dosage of (M + CSF) is kept at a constant level for a better workability of fresh concrete. Different workability, flexural and compressive strengths were obtained for concretes with a constant cement and a metakaoline dosage, and for a constant dosage (FA + L) but a different ratio FA / L. An optimum composition was found and concretes for other tests were designed using this composition.

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