Results 261 to 270 of about 146,363 (308)
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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.
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A commonly published experiment can be expanded so that students may obtain the enthalpy of the reaction between anhydrous salts and water.
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Heat capacity of hydration in zeolites
American Mineralogist, 2007Dehydration of zeolites is a critical factor in their stability, effectiveness as storage media for thermal energy, and influence on the thermal evolution of radioactive waste repositories. Prediction of the hydration states of zeolites as a function of temperature, pressure, and water activity is often hampered by limited data on the heat capacity ...
P. S. Neuhoff, J. Wang
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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
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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
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Heat of hydration models of cementitious materials
Advances in Cement Research, 2012Silica fume from certain metallurgical operations, granulated slag from metal industries and fly ash from the combustion of coal are industrial by-products that have been widely used as mineral admixtures in normal- and high-strength concrete. Due to the reaction between calcium hydroxide (CH) and mineral admixtures, the hydration of concrete ...
Xiao-Yong Wang, Han-Seung Lee
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The heats of hydration of cement constituents
Cement and Concrete Research, 1982Abstract Integral heats of hydration and time courses of heat power function were directly measured for a series of nine cements in a heat-conduction calorimeter. Both the heat power and the integral heat of hydration of cement constituents C3S, C2S, and C3A+C4AF were evaluated by the thermochemical analysis method. The rate of heat evolution courses
M. Kamiński, W. Zielenkiewicz
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Enhancement of immunoblot sensitivity by heating of hydrated filters
Analytical Biochemistry, 1986Immunoblots of either dot or Western type were exposed to heat before reaction with antibody. Dramatic increases in immunoblot sensitivity were seen for certain antigen-antibody pairs after heating of either dry or hydrated nitrocellulose filters at or above 100 degrees C.
Swerdlow, Paul S. +2 more
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Finite Element Simulation of Hydration Heat Using Fuzzy Logic Model of Hydration
Key Engineering Materials, 2016This paper deals with heat of hydration in a concrete structure at the early age. The influence of temperature on development of hydration heat in the concrete structure is implemented through a fuzzy-logic model of the degree of hydration. The transient heat transfer problem was solved as a three-dimensional finite element simulation.
Jitka Mádlová +2 more
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On the hydration heat capacity change of benzene
Biophysical Chemistry, 2005The heat capacity change associated with the hydration of benzene is a large and positive quantity, but it is significantly smaller than that associated with the hydration of an alkane having the same accessible surface area of benzene, the corresponding alkane. This large difference merits attention and should be rationalized.
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Thermochemical heat storage materials – Performance of mixed salt hydrates
Solar Energy, 2016Abstract Thermochemical heat storage is highly promising, in particularly with a view to long-term heat storage. For the implementation of heat storage in households, thermochemical reactions in the low temperature range below 120 °C are important. Especially salt hydrates such as MgCl2, CaCl2 or MgSO4 were tested with micro gravimetric methods for ...
Rammelberg, Holger U. +4 more
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Effect of the Hydration Heat on Creep
Applied Mechanics and Materials, 2013A method for the box girders creep calculation considering the hydration heat is proposed and the effect of the hydration on the creep is discussed. The box girder is divided into several components and the average hydration temperature of the component is defined to represent the general condition resulted in the hydration. The formulae of the average
Rui Rao, Yong Hui Huang, Ai Rong Liu
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