Yielding and flow of foamed metakaolin pastes

Microstructural Changes Induced by CO2 Exposure in Alkali-Activated Slag/Metakaolin Pastes

The structural changes induced by accelerated carbonation in alkali-activated slag/ metakaolin (MK) cements were determined. The specimens were carbonated for 540 h in an environmental chamber with a CO2 concentration of 1.0 ± 0.2%, a temperature of 20 ± 2°C, and relative humidity of 65 ± 5%. Accelerated carbonation led to decalcification of the main binding phase of these cements, which is an ...

Yielding and Flow of Monodisperse Emulsions

prised of highly deformed droplets. Such emulsions exhibit We have measured the yield transition of monodisperse emula plastic-like response to shear deformations; for small deforsions as the volume fraction, f, and droplet radius, a , are varied. mations, they resist the shear elastically, with the stress, t, We study the crossover from the perturbative shear regime, which being linearly propo...

Assessment of the interaction of polycarboxylate superplasticizers in hydrated lime pastes modified with nanosilica or metakaolin as pozzolanic reactives

Two polycarboxylate ether copolymers were assessed as superplasticizers (SPs) for hydrated lime pastes modified with two reactive compounds, nanosilica (NS) and ceramic metakaolin (MK). Characterization of the molecular structure of the SPs by Size Exclusion Chromatography, XRD, FTIR and MALDI-TOF (Matrix Assisted Laser Desorption Ionization Time-of-Flight) mass spectrometry was performed. The ...

Gas Trapping During Foamed Flow in Porous Media

Yielding and flow of highly concentrated, few-layer graphene suspensions.

For a wide range of applications of graphene suspensions, a thorough understanding of their rheological properties is crucial. We probe the microstructure of dense suspensions of micron-sized, few-layer, defect-free graphene platelets by measuring their viscoelastic properties at various concentrations up to 39 mg ml(-1). We propose a model to relate the yield strain to the mesh size of the mic...