Mostrando ítems 31-40 de 58
Hydration Reactions and Mechanical Strength Developments of Iron- Rich Sulfobelite Eco-cements
Belite calcium sulfoaluminate (BCSA) cements are low-CO2 building materials. However, their hydration behavior and its effect on mechanical properties have still to be clarified. Here, we report a full multitechnique study ...
In-situ early age hydration of cement-based materials by synchrotron X-ray powder diffraction
Cement based binders are building materials of worldwide importance. Since these samples are very complex, the knowledge/control of their mineralogical composition are essential to design and predict materials with ...
In situ hydration imaging study of a ye'elimite paste by ptychographic x-ray computed tomography
Eco-cements are a desirable alternative to ordinary Portland cements because of their lower CO2 footprints. For instance, the manufacture of Calcium SulfoAluminate (CSA) cements is more environmentally friendly than that ...
In-situ hydration study of sulfobelite eco-cements
Hydration study of Belite-Alite Calcium Sulfoaluminate (BACSA) cement blended with fly ash
The main objective of this work is to understand the effect of the addition of fly ash (0, 15 and 30 wt%) in the hydration of a BACSA cement paste (water/cement=0.4) prepared with 12 wt% of anhydrite. The pastes were ...
In-situ hydration studies of C4AF at early ages in the presence of other phases
The ferrite phase, C4AF in cement nomenclature, also called brownmillerite, is the major iron-containing phase in Ordinary Portland Cement (OPC) and in iron rich belite calcium sulfoaluminate cements. The term “ferrite” ...
Quantitative disentanglement of nanocrystalline phases in cement pastes by synchrotron ptychographic X-ray tomography
Mortars and concretes are ubiquitous materials with very complex hierarchical microstructures. To fully understand their main properties and to decrease their CO2 footprint, a sound description of their spatially resolved ...
Multiscale understanding of tricalcium silicate hydration reactions
(Nature Publishing Group, 2018-06)
Tricalcium silicate, the main constituent of Portland cement, hydrates to produce crystalline calcium hydroxide and calcium-silicate-hydrates (C-S-H) nanocrystalline gel. This hydration reaction is poorly understood at ...
Pseudo-cubic crystal structure and phase transition in doped ye'elimite
(ACS publications, 2014)
Sodalites are tridimensional alumino-silicate materials containing cages where loosely bonded anions are located. Ye'elimite, Ca4[Al6O12]SO4, is outstanding as an aluminate sodalite with a flexible framework accepting ...
Photocatalytic behavior of phosphonate-based hybrid materials on dyes and phenols degradation
There is increasing interest in using heterogeneous catalysis for mineralization of organic pollutants. Within Advanced Oxidation Processes (AOPs), Photo-Fenton reaction is one of the most efficient methodologies. To ...