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Showing 1 to 16 of 16 for “"hydration reaction"”.
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Mechanical Agitation Effects on Physical Properties of Calcium-Silicate-Cement Sealers
… This study investigated real-time setting reactions and effects of mechanical agitation on flow, film thickness, and setting time of calcium-silicate-cement sealer (EndoSequence Bioceramic sealer). Single-paste bioceramic sealer (Brasseler, USA) was agitated for 10 seconds using a vortex …
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Modeling of the Aging Viscoelastic Properties of Cement Paste Using Computational Methods
… The dissolution process occurring during the hydration reaction can change the stress distribution inside cementitious materials, resulting in an apparent viscoelastic behavior of the whole cementitious materials. This finding requires new consideration of mechanisms of time-dependent behavior …
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The thermodynamics, mechanism and kinetics of the catalytic conversion of propylene and water to diisopropyl ether over amberlyst 15
… propylene to water ratios between 1:5 and 10:1. Reaction proceeded in the liquid phase within the catalyst particles. The only reactions that occurred in the system were the hydration of propylene to form isopropanol (IPA) , the alkylation of IPA with propylene to form DIPE and the bimolecular …
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Homogeneous nucleation of water vapor in inert gas atmospheres
… The law of mass action is applied to this hydration reaction to achieve the dependence of the nucleation rate on the nature for the carrier gas. Since detailed computations were undertaken for only one cluster size, namely a 57 molecule four celled cluster, the results apply to only one …
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The influence of fly ash and ground granulated blastfurnace slag on restrained shrinkage cracking of bonded overlays
… material properties depends on the degree of hydration of the binder material. Fly ash (FA) and slag (GGBS) are known to influence the hydration reaction when added to the binder material. This change in hydration reactions affects the development of the mechanical properties of the concrete, …
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Prediction of early-age cracking of UHPC materials and structures : a thremo-chemo-mechanics approach
… high cement content and the highly exothermic hydration reaction. Because of the risk of early-age UHPC cracking, there is a need to develop a material model that captures the behavior of UHPC at early-ages. The objective of this research is to develop a new material model for early-age UHPC …
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Thermal curing of concrete with conductive polymer technology.
… that reacts with the binder in the form of a hydration reaction. This hydration reaction or strength development is dependant on two primary curing factors, time and temperature. Increasing the rate of strength development of concrete by elevating the curing temperature at early ages has …
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EXPLORATION AND MECHANISTIC STUDY OF WEAKLY COORDINATING ANIONS UNDER THERMAL AND PHOTOCHEMICAL CONDITIONS FOR SELECTIVE TRANSFORMATIONS OF C-C MULTIPLE BONDS
… to deliver a mild condition for internal alkyne hydration reaction was developed. Studies on the roles of solvents, temperature, and substrate into the mechanism were accomplished through rate and kinetic isotope effect experiments. In the third chapter, a series of ion pairs in metal-based …
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The structure, function and engineering of a thermostable nitrile hydratase
… of organocyanides to amides via a non-hydrolytic hydration reaction. They are industrially relevant enzymes, currently used in the manufacture of nicotinamide and acrylamide. The target of this study belongs to the thermophilic bacteria Geobacillus pallidus. The G. pallidus RAPc8 NHase is a …
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Expansion and shrinkage of early age cementitious materials under saturated conditions : the role of colloidal eigenstresses
… slurry and triggers a set of complex exothermic reactions. As the cement slurry transitions from a suspension to a gel and ultimately to a stone-like porous solid, the material develops mechanical properties. This transition, however, is also accompanied by bulk volume changes, which -if …
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Molecular Crosslinking of Calcium-Silicate-Hydrate with Organosilanes: Toward Engineering of Cementitious Matrices with High Thermal Resistance
… (C-S-H), the main product of cement hydration, are directly bridged with bis-organosilanes molecules. The crosslinking with organic molecules provides C-S-H with attributes imperative for the reduced thermal conductivity e.g. contrast in vibrational densities of states and reduced …
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From molecular Au(I) complexes to subnanoclusters and nanoparticles: study of the influence of secondary interactions in (photo)catalytic systems
… complex [Au(C-CPh)]n in the A3 coupling reaction for the obtention of propargylamines has been evaluated. The active species involved in the catalyzed coupling reaction were identified through an experimental mechanistic study. Furthermore, the importance of weak interactions, …
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Salt hydrates for thermochemical energy storage
… due to their high energy density, suitable dehydration temperatures and water vapour being a safe and cheap reaction partner. However, this method of thermal energy storage is yet to be fully developed or commercialized. The overarching aim of this work is to investigate salt hydrates for …
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Zur Wirkung von Additiven auf die Hydratationsreaktion von Anhydrit II
Anhydrit II (AII) wird industriell hauptsächlich als Bindemittel bei der Fußbodenestrich-Herstellung eingesetzt. Zur Beschleunigung der Abbindereaktion und der daraus resultierenden schnelleren Verfestigung des Fußbodens wird Kaliumsulfat als Additiv verwendet. Im Rahmen dieser Arbeit wurden …
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Development of a New Cold Binder Course Emulsion Asphalt
… with Ca(OH)2 creating C-S-H gel through the hydration process. This results in a very high early strength and improved mechanical properties. Balanced oxide compositions, within the new filler, were identified as responsible for an enhanced hydration reaction. A laboratory programme of …
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Design of Functional Polyesters for Electronic and Biological Applications
… renewable, polyesters. A formic acid hydration reaction generated an isomeric mixture of AB hydroxyester or AB hydroxyacid monomers for melt polymerization. Thermal analysis elucidated the plant-based polyesters exhibited a single transition, a Tg of about -60 °C. Aliphatic polyesters …