NDLI: Determination of length changes due to moisture variations in autoclaved aerated concrete

Content Provider	Springer Nature Link
Author	Gottfredsen, F. R. Knutsson, H. H. Nielsen, A.
Copyright Year	1997
Abstract	Length changes of autoclaved aerated concrete due to moisture variations have been investigated by tests on a Danish brand of autoclaved aerated concrete. The investigation have shown that autoclaved aerated concrete with delivery moisture content exhibits swelling when initially conditioned at relative humidities above 43%, whereas initial conditioning below 43% relative humidity leads to shrinkage. After the initial conditioning has been performed, length changes are shown to be almost proportional to the variation in relative humidity.The investigation has shown that the present Danish Standard in this area is misleading, and the principle of a new NORDTEST method, NT Build 444(1996), is presented, Furthermore this test method is compared with the European Standard EN 680,Determination of the drying shrinkage of autoclaved aerated concrete, and a draft for another European Standard prEN 772-12:1992,Determination of length change during moisture movements in autoclaved aerated concrete masonry units.Les variations de longueur en béton cellulaire autoclavé dues à des variations d'humidité ont été examinées par des essais d'une marque danoise de béton cellulaire. Les analyses ont montré que le béton cellulaire autoclavé, qui contient de l'humidité à la livraison, se gonfle lorsqu'il est conditionné pour la première fois à des humidités relatives dépassant 43%, tandis qu'en-dessous de 43%, le conditionnement primaire entraîne un retrait de séchage. Après le conditionnement primaire, les variations longitudinales sont presque proportionnelles aux variations d'humidité.Les analyses montrent que la norme danoise existante sur le retrait de séchage du béton cellulaire autoclavé est inexacte. Une nouvelle méthode NORDTEST, NT Build 444 (1996), est présentée. En outre, cette méthode d'essai est comparée avec la norme européenne, EN 680,Détermination du retrait de sèchage du béton cellulaire autoclavé, et avec un projet d'une autre norme européenne, prEN 772-12, Méthodes d'essai pour éléments de maçonneria—Partie 2:Détermination de la variation de longueur par variation d'humidité dans les éléments de maçonnerie en béton cellulaire autoclavé.
Starting Page	148
Ending Page	153
Page Count	6
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	30
Issue Number	3
e-ISSN	18716873
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Theoretical and Applied Mechanics Structural Mechanics Mechanical Engineering Operating Procedures, Materials Treatment Civil Engineering Building Materials
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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