scholarly journals Determination of the Surface Properties of Alkali-Activated Slag by Inverse Gas Chromatography

2018 ◽  
Keyword(s):  
Gas Chromatography ◽  
Surface Properties ◽  
Inverse Gas Chromatography ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated

Shrinkage of Fine-Grained Composites Based on Alkali-Activated Slag

2018 ◽  
Vol 761 ◽  
pp. 7-10 ◽  
Author(s):  
Barbara Kucharczyková ◽  
Vlastimil Bílek Jr. ◽  
Dalibor Kocáb ◽  
Ondřej Karel
Keyword(s):  
Experimental Investigation ◽  
Experimental Determination ◽  
Alkali Activated Slag ◽  
Fine Grained ◽  
Shrinkage Reducing Admixture ◽  
Activated Slag ◽  
Alkali Activated

The paper deals with the experimental determination of shrinkage development of the composites based on the alkali-activated slag (AAS). The main aim of the experimental investigation was to verify the effect of the addition of shrinkage-reducing admixture (SRA) on the overall process of shrinkage properties during AAS composites ageing.

Experimental Determination of Early Shrinkage of Alkali-Activated Slag

2019 ◽  
Vol 292 ◽  
pp. 114-119
Author(s):  
Martin Alexa ◽  
Dalibor Kocáb ◽  
Barbara Kucharczyková ◽  
Jan Kotrla
Keyword(s):  
Autogenous Shrinkage ◽  
Volume Changes ◽  
Alkali Activated Slag ◽  
Detailed Evaluation ◽  
The Difference ◽  
Organic Admixture ◽  
Activated Slag ◽  
The Relationship ◽  
Alkali Activated

This paper deals with the relationship between chemical processes in the early stages of hydration of alkali-activated slag, volume changes and the development of the microstructure of this material. Two test pastes were produced for the purpose of the experiment - one with and the other without an organic admixture (isopropyl alcohol). The pastes were used to monitor autogenous shrinkage by measuring volume changes and at the same time the changes in the material during setting and early hardening using a modern ultrasonic instrument Vikasonic. The output of the described experiment is a detailed evaluation of the difference in the behaviour of the used alkali-activated paste with and without the addition of an organic admixture.

scholarly journals Correction of some thermodynamic surface properties of Sodium Alginate determined by Inverse Gas Chromatography

2021 ◽  
Author(s):  
Tayssir Hamieh
Keyword(s):  
Gas Chromatography ◽  
Sodium Alginate ◽  
Surface Area ◽  
Surface Properties ◽  
Inverse Gas Chromatography ◽  
Chemical Engineering ◽  
Specific Enthalpy ◽  
Free Energy Of Adsorption ◽  
Dispersive Component

Abstract In their paper published in the Journal of Chemical Engineering Data, Ugraskan et al. [1] made several inaccuracies in the determination of the surface properties of sodium alginate by using the inverse gas chromatography (IGC) technique. The proposed method to determine the dispersive component of the surface energy, I, cannot be correctly evaluated, because it depends on the surface area of n-alkanes or of methylene group. This surface area supposed by Ugraskan et al. [1] constant strongly depends on the temperature. Therefore, the specific free energy of adsorption, (-ΔGsp), and consequently the specific enthalpy of adsorption, (-ΔHsp), cannot be known with accuracy. The wrong values of (-ΔHsp), certainly lead to inaccurate determination of the acid KA and base KD constants of the solid.

scholarly journals Inverse gas chromatography as a method for determination of surface properties of binding materials

2017 ◽  
Vol 242 ◽  
pp. 012001
Author(s):  
Jihai Yu ◽  
Xiaolei Lu ◽  
Chunxia Yang ◽  
Baoli Du ◽  
Shuxian Wang ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Surface Properties ◽  
Inverse Gas Chromatography

scholarly journals Bentonite from Porto Santo Island, Madeira archipelago: surface properties studied by inverse gas chromatography

Clay Minerals ◽  
2010 ◽  
Vol 45 (1) ◽  
pp. 77-86 ◽  
Author(s):  
N. Cordeiro ◽  
J. Silva ◽  
C. Gomes ◽  
F. Rocha
Keyword(s):  
Gas Chromatography ◽  
Surface Properties ◽  
Inverse Gas Chromatography ◽  
Particle Surface ◽  
Sorption Isotherms ◽  
Surface Heterogeneity ◽  
Surface Areas ◽  
Dispersive Surface Energy ◽  
Madeira Archipelago

AbstractThe present paper shows the importance of Inverse Gas Chromatography (IGC) for the determination of the surface properties of bentonites. These properties are dispersive surface energy, acid-base properties, surface heterogeneity, sorption isotherms, BET surface areas and heat of sorption, using different probe molecules. IGC can contribute to the interpretation, prediction and optimization of the studied materials' properties. The paper focuses on two distinctive bentonite samples from Porto Santo Island, Madeira archipelago. In view of their potential value, achieved through their incorporation in products for dermopharmacy and dermocosmetics, particle size and particle surface properties are of fundamental importance.

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