NDLI: Coefficient of thermal dilation of a fresh mortar

Content Provider	Springer Nature Link
Author	Sarkis, M. Granju, J. L. Arnaud, M. Escadeillas, G.
Copyright Year	2002
Abstract	Les variations dimensionnelles des matériaux cimentaires sont à l'origine de fissures souvent préjudiciables. Elles sont dues principalement aux retraits et aux effets de la température, et doivent être prises en compte dès le début de solidification du matériau, c'est-à-dire dès sa prise.Afin de maîtriser cette fissuration, les chercheurs doivent avoir une connaissance des mécanismes impliqués. Cela leur permettra de définir ensuite des formulations adaptées. À cette fin, le coefficient de dilatation thermique du matériau est un des paramètres dont la connaissance est indispensable. Le présent article est centré sur sa mesure et son évolution, depuis la prise jusqu'à l'âge de 24 heures.Le matériel est celui en usage dans les laboratoires pour mesurer les variations dimensionnelles du matériau frais et le mode opératoire est simple.Les résultats obtenus se situent à l'intérieur de la plage couverte par ceux des autres auteurs. Ils confirment une diminution régulièrement décélérée du coefficient de dilatation pour atteindre, entre 15 et 24 heures environ, la stabilisation à la valeur mesurée sur matériau durci.Par la méthode présentée ici, sa valeur mesurée a varié de 18 μm/m/°C lors de la prise (âge≈3 heures) jusqu'à 13 μm/m/°C après 24 heures. Cette connaissance du coefficient de dilatation permet de prédire avec pertinence le comportement du béton frais. Elle permet aussi, en laboratoire, de soustraire les effets thermiques des variations dimensionnelles mesurées.The length changes of cement-based materials, mainly due to shrinkage and to thermal effects, often cause detrimental cracking. In order to completely master the phenomenon, researchers must have a thorough knowledge of the involved mechanisms starting as soon as the setting of the material. This will allow them to develop optimised compositions.For that, the knowledge of the thermal coefficient of expansion is necessary. On the one hand, when purely hydrical length changes are investigated, it allows to eliminate the thermal effects from the data. On the other hand, when thermal effects must be accounted for, it allows an accurate forecasting of the behaviour of the concrete.This paper focuses on the measurement of the thermal dilation coefficient and the follow-up of its evolution between the setting and the 24$^{th}$ hour.The proposed method is simple and the common devices to measure the 0–24-hour length changes are convenient. Moreover, reliable measurements are obtainable as soon as setting, about 3 hours after pouring. The results are within the range proposed in the literature. They confirm that, while the material is ageing, its dilation coefficient α exhibits a continuously decelerated decay until it stabilises, between the 15$^{th}$ and 24$^{th}$ hour, at the value characterising the hardened material. On a silica sand mortar, we measured α=18 μm/m/°C at the age of 3 hours and α=13 μm/m/°C for the hardened material.
Starting Page	415
Ending Page	420
Page Count	6
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	35
Issue Number	7
e-ISSN	18716873
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
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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