Comparison of the Effects of Different Pozzolana on the Properties of Self-Compacting Concrete

2016 ◽  
Vol 677 ◽  
pp. 103-107 ◽  
Author(s):  
Eva Vejmelková ◽  
Jaroslava Koťátková ◽  
Monika Čáchová ◽  
Dana Koňáková
Keyword(s):  
Fly Ash ◽  
Transport Properties ◽  
Water Vapour ◽  
Liquid Water ◽  
Concrete Mixture ◽  
Vapour Transport ◽  
Self Compacting Concrete ◽  
Water Vapour Transport

The article compares the basic physical, mechanical and both liquid water and water vapour transport properties of self-compacting concrete containing different pozzolanic admixtures. Limestone, fly ash and metakaolin were used. A concrete mixture without any pozzolana was also manufactured as a reference. The best values of studied properties were recorded for the metakaolin concrete.

scholarly journals A critique on ‘A Boltzmann transformation method for investigation of water vapour transport in building materials’

2020 ◽  
pp. 174425912098004
Author(s):  
Hans Janssen
Keyword(s):  
Transport Properties ◽  
Water Vapour ◽  
Reference Values ◽  
Building Materials ◽  
Transformation Method ◽  
Dynamic Measurement ◽  
Vapour Transport ◽  
Vapour Permeability ◽  
Water Vapour Transport

In 2011, this journal published the paper ‘A Boltzmann transformation method for investigation of water vapour transport in building materials’, proposing a dynamic measurement of building materials’ vapour permeability via the Boltzmann-Matano method. This critique points out that this publication is flawed, since it proposes an invalid approach and presents erroneous results. The analysis first shows that the presented vapour permeability values cannot be reproduced and instead far lower vapour transport properties are obtained. These corrected outcomes are however also much below the dry-cup reference values, and it is established that these deviations stem from the invalidity of the proposed approach, due to disregarding the material’s hygroscopicity. Given its erroneous results and invalid approach, it is finally recommended to have the paper officially retracted by the journal.

Influence of processing temperature on the water vapour transport properties of wheat gluten based agromaterials

2011 ◽  
Vol 33 (2) ◽  
pp. 457-461 ◽  
Author(s):  
Hélène Angellier-Coussy ◽  
Emmanuelle Gastaldi ◽  
Nathalie Gontard ◽  
Valérie Guillard
Keyword(s):  
Transport Properties ◽  
Water Vapour ◽  
Wheat Gluten ◽  
Processing Temperature ◽  
Vapour Transport ◽  
Water Vapour Transport

The Comparison of Water, Water Vapour Transport Properties and Mechanical Characterization of Two Commercial Plasters on Market in the Czech Republic

2016 ◽  
Vol 722 ◽  
pp. 357-361
Author(s):  
Monika Čáchová ◽  
Dana Koňáková ◽  
Eva Vejmelková ◽  
Jaroslava Koťátková ◽  
Robert Černý
Keyword(s):  
Czech Republic ◽  
Transport Properties ◽  
Water Vapour ◽  
Mechanical Characterization ◽  
Vapour Transport ◽  
The Czech Republic ◽  
Matrix Density ◽  
Water Vapour Transport ◽  
Water Transport Properties

This article deals with the comparison of two different renovation plasters produced by different companies in the Czech Republic. The selected stuccos were Feinputz 212 supplied by HASIT Šumavské vápenice a omítkárny s.r.o and Kbelosan F from Knauf Praha spol. s.r.o. They were studied in the means of basic physical properties, mechanical properties, water transport properties and water vapour transport properties. Results revealed only slight variations in bulk density, matrix density and open porosity, but in the means of transport properties, the plaster Feinputz 212 showed much higher openness to water and water vapour transport.

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