Results 271 to 280 of about 2,529,989 (344)

Hydration Heats of Zeolites For Evaluation of Heat Exchangers

Journal of Thermal Analysis and Calorimetry, 2001
The enthalpy of hydration of purified clinoptilolite from Beli Plast, Bulgaria, and various cation-exchanged types such as Na-, K-, Ca- and Mg-clinoptilolite was determined by the adiabatic water-vapor absorption calorimeter. The hydration enthalpy becomes more exothermic in the sequence K, Na, Ca, Mg depending on hydration energy values of exchanged ...
N. Petrova, T. Mizota, K. Fujiwara
openaire   +1 more source

Heat of hydration

Journal of Chemical Education, 1971
A commonly published experiment can be expanded so that students may obtain the enthalpy of the reaction between anhydrous salts and water.
openaire   +1 more source

Heats of formation of some hydrates

Canadian Journal of Chemistry, 1976
Heats of formation of hydrates may be measured by dissolving the hydrate and the corresponding anhydrate in water to attain the same final concentration and measure the difference in heats of solution.Measurements were made at 0 °C in a modified Bunsen ice calorimeter, well insulated, and surrounded with an ice–water mixture.The data obtained are a ...
Alan Phillipson, Gordon R. Finlay
openaire   +1 more source

Hydration and Heat Development

2018
The driving process of early-age cracking in massive element is the hydration and reactions of the binder that composes the concrete. Indeed, these reactions are highly exothermic and lead to heat generation in the structure. It is thus of primary importance to be able to characterise and predict the heat generation of binders in order to assess the ...
Lacarriere, Laurie, Knoppik, Agnieszka, Leal da Silva, Wilson Ricardo, Honorio, Tulio, Šmilauer, Vit, Asamoto, Shingo, Fairbairn, Eduardo   +6 more
openaire   +1 more source

Hydrate Prevention With Electrically Heated Jumpers

Offshore Technology Conference, 2007
Abstract Hydrate management in deepwater production jumpers connecting production Christmas Trees to a manifold, or directly to a production line, generally requires the injection of large quantities of methanol to flush the line during the preservation sequence that follows a production shut down.
François Bardon, William L. Hudson, Alain Cretenet   +2 more
openaire   +1 more source

Beat the Heat: Managing Heat and Hydration in Marching Band

The Journal of School Nursing, 2002
Marching band students are athletes who practice outdoors under conditions that expose them to dehydration, heat exhaustion, and sunstroke. They suffer these heat-related injuries because breaking formation frequently to adequately hydrate is impractical.
openaire   +2 more sources

Heat of hydration in concrete

Magazine of Concrete Research, 1954
Summary The paper traces the development of a function between time and temperature, which makes it possible to refer the process of hardening of concrete at varying temperature to hardening at constant temperature. It is further shown that it is possible to predetermine the temperature of concrete during hardening when properties of concrete, sizes
openaire   +2 more sources

Heat of hydration of 2-nitropyrrole

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1958
1. The shift in the ultraviolet absorption maximum of 2-nitropyrrole resulting from change in solvent from glacial acetic acid to dilute acetic acid is associated with hydration of the solute molecules; the heat of hydration has a value of from −1.5 to − 1.7 kcal/mole. 2.
V. M. Belikov, S. G. Mairanovskii, E. N. Safonova, S. S. Novikov   +3 more
openaire   +1 more source

Precision of cement hydration heat models in capturing the effects of SCMs and retarders

Magazine of Concrete Research, 2018
A major input to numerical simulation models used to predict the risk of early-age thermal cracking in concrete is the hydration heat estimation.
Maryam Ghareh chaei, A. Akbarnezhad, A. Castel, R. Lloyd, L. Keyte, S. Foster   +5 more
semanticscholar   +1 more source

On-site measurement of heat of hydration of delivered mass concrete

, 2020
In this study, measurements of the heat of hydration of mass concrete delivered on-site were proposed. A one-meter concrete cube, cast adjacent to the real structure, was developed as an on-site semi-adiabatic calorimeter. A table was established for the
H. Chen, S. Mardmomen, G. Leon
semanticscholar   +1 more source