Search results for "fineness"

showing 3 items of 3 documents

Effect of content and particle size distribution of high-calcium fly ash on the rheological properties of cement pastes

1997

Abstract The Theological properties of high-calcium fly ash cement pastes were investigated. An increase both in yield value and plastic viscosity with fly ash content was found. It was also observed that the pastes became more fluid with the higher fly ash fineness. A more important relation was shown between the fine fractions (

CementViscosityMaterials scienceYield (engineering)RheologyFly ashFinenessParticle-size distributionGeneral Materials ScienceBuilding and ConstructionParticle sizeComposite materialCement and Concrete Research
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Mechanisms and parameters controlling the tricalcium aluminate reactivity in the presence of gypsum.

2007

International audience; To understand the mechanisms and the parameters controlling the reactivity of tricalcium aluminate in the presence of gypsum at an early age, a study of the hydration of the “C3A–sulphate” system by isothermal microcalorimetry, conductimetry and a monitoring of the ionic concentrations of diluted system suspensions have been carried out with various gypsum quantities. The role of C3A source and its fineness were also studied. This work shows the fast initial formation of AFm phase followed by ettringite formation during the period when the sulphate is consumed. It has been highlighted that the time necessary to consume all the gypsum varies with the type of C3A and i…

Isothermal microcalorimetryEttringiteGypsumFineness0211 other engineering and technologieschemistry.chemical_elementMineralogyHydrationchemical and pharmacologic phenomena02 engineering and technologyCalciumengineering.materialEttringitechemistry.chemical_compound021105 building & constructionGeneral Materials ScienceReactivity (chemistry)Tricalcium aluminateBuilding and ConstructionCa3Al2O6021001 nanoscience & nanotechnologyKineticschemistryChemical engineeringengineering0210 nano-technologyAFm phase
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The role of nanoparticles in decreased washout of underwater concrete

2019

Abstract The paper presents research results of the influence of SiO2 nanoparticles on the washout of underwater concrete and hardened concrete. Based on infrared spectroscopy (FTIR) and thermogravimetric (TGA) analyses of the applied anti-washout admixture (AWA), its chemical structure was determined. A beneficial effect of SiO2 nanoparticles on the reduction of the mix washout was demonstrated and the most probable reason for that phenomenon was given, taking into account the AWA chemical structure and its behaviour in the concrete mix environment. It was found that a dosing method of AWA and nanoparticles to the concrete influenced the washout.

Thermogravimetric analysisMaterials sciencefresh concreteChemical structure0211 other engineering and technologiesInfrared spectroscopyWashoutNanoparticle020101 civil engineering02 engineering and technologyBuilding and Construction0201 civil engineeringChemical engineeringfinenessSio2 nanoparticles021105 building & constructionadmixturenanoparticlesGeneral Materials ScienceFourier transform infrared spectroscopyCivil and Structural EngineeringConstruction and Building Materials
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