A Method of Assessing Parameters of Air-Void Structure in Air-Entrained Concretes
PBN-AR
Instytucja
Wydział Budownictwa i Architektury (Politechnika Świętokrzyska)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Journal of Civil Engineering and Architecture
ISSN
1934-7359
EISSN
Wydawca
DOI
URL
Rok publikacji
2015
Numer zeszytu
7
Strony od-do
798-806
Numer tomu
9
Link do pełnego tekstu
Identyfikator DOI
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Autorzy
(liczba autorów: 2)
Słowa kluczowe
en
Distribution of air pore sizes
distribution of aggregate grain sizes
protected paste area
numerical model of the porosity of the concrete.
Streszczenia
Język
en
Treść
The air-void size distribution and number of air voids are crucial characteristics of air-entrainment. The standard spacing factor L is based on the Powers model, in which considerable simplifications are assumed. A better solution is provided by the Philleo factor, which determines the percentage content of protected paste located at a distance S from the edge of the nearest air void. Developing the concept put forward by Philleo, a method of determining the volume of protected paste on the basis of images generated from the numerical model of concrete grain structure including layout of aggregate-paste-air, is proposed. It is the ratio of the volume of the paste protected by air voids to the total paste volume. The PPV (protected paste volume) index accounts not only for sizes and number of air voids, but also for the role of aggregate particles in the placement of these pores, which is often disregarded in analyses. The PPV results obtained from image analysis were compared with standard spacing factor L and with the parameter developed by Philleo. The analyses conducted by the authors shows that accounting for aggregate grains in calculations substantially affects the assessment of the quality of the air-pore structure.
Cechy publikacji
peer-reviewed
original-article
Inne
System-identifier
20170
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