Results 201 to 210 of about 506,757 (254)

Rheology and apparent activation energy of alkali activated phosphorous slag

Construction and Building Materials, 2018
Abstract This paper focused on determining the rheological behavior and apparent activation energy of activated phosphorous slag (AAPS) with sodium silicate and NaOH at different SiO2/Na2O (S/N) and Na2O/Al2O3 (N/A) molar ratios. The results showed that the AAPS paste behaved like a shear-thinning fluid, its rheological behavior obeyed the Herschel ...
Hamideh Mehdizadeh, Ebrahim Najafi Kani
exaly   +2 more sources

Determination of apparent activation energy of concrete by isothermal calorimetry

Cement and Concrete Research, 2000
In recent works at our laboratory, instrumentations have been developed to carry out calorimetric tests on concrete in isothermal conditions, which give much information. The objective of this article is, on the basis of this technique, to study the validity of the Arrhenius law and to determine the evolution of apparent activation energy of the ...
B Duthoit
exaly   +2 more sources

The apparent activation energy and dynamic fragility of ancient ambers

Polymer, 2014
Abstract According to the literature, different types of materials have different glass transition temperature ( T g ) dependences of apparent activation energy ( E g ) and dynamic fragility ( m ). In previous work we found that for different ambers, there were different glass transition temperatures.
Gregory B McKenna
exaly   +3 more sources

Determination of the Apparent Activation Energy of Concrete by Adiabatic Test

Key Engineering Materials, 2011
It is known that apparent activation energy of the binders in concrete characterizes the sensitivity of concrete hydration processes to temperature. In this paper the apparent activation energies of concretes containing different complex binders have been determined through adiabatic temperature rise test.
Jia Chun Wang
exaly   +2 more sources

Apparent activation energy of the nerve impulse conduction

Experientia, 1971
On definit la notion d'energie apparente d'activation de la transmission nerveuse et on calcule les valeurs de l'enthalpie d'activation de ce processus. Les resultats sont discutes par rapport au mecanisme moleculaire de la conduction.
D G, Mărgineanu, I, Mărgineanu
openaire   +2 more sources

Nanoparticles and Apparent Activation Energy of Portland Cement

Journal of the American Ceramic Society, 2014
Although chemically inert nanosize mineral fillers have been shown to modify early cement hydration kinetics, with the effects dependent upon usage rate, particle size, and dispersibility, the effects of such fillers on the “apparent activation energy” ( E a ) of cement ...
Amal R. Jayapalan, Melinda L. Jue, Kimberly E. Kurtis   +2 more
openaire   +1 more source

Intraparticle diffusion and the apparent activation energy

Chemical Engineering Science, 1969
Abstract The course of Arrhenius-type plots of calculated reaction rates yields information about the apparent activation energy of diffusionally influenced catalytic reactions obeying Langmuir—Hinshelwood type rate equations. In the region of strong diffusional effects, it is possible to express the activation energy explicitly. The magnitude of the
P. Schneider, P. Mitschka
openaire   +1 more source

Determination of the apparent activation energy of concrete carbonation

Journal of Wuhan University of Technology-Mater. Sci. Ed., 2013
Accelerated carbonation experiments about the development of carbonation rates of ordinary Portland cement concrete under different artificial climates were carried out. Six water cement ratios and six climate condition combinations of temperature and relative humidity were used.
Guo Li, Yingshu Yuan, Jianmin Du, Yongsheng Ji   +3 more
openaire   +1 more source