NDLI: A study of the CEN test method for measurement of the carbonation depth of hardened concrete

Content Provider	Springer Nature Link
Author	Jones, M. R. Dhir, R. K. Newlands, M. D. Abbas, A. M. O.
Copyright Year	2000
Abstract	This paper reports on the effect of an enhanced test method for the recently drafted CEN method for measuring the depth of carbonation of hardened concrete which was aimed at reducing the known variability of the test. Variations in environmental factors that may have led to a poor precision have been identified, for example the assumption that natural ventilation will provide the required level of carbon dioxide and relative humidity has been shown to be incorrect. This lead to the development of an environmental control system the actively controls the storage atmosphere. In addition to this, a two stage normalisation process of test data is proposed comprising the use of two additional mixes along with the mix being tested. Results from the assessment of the repeatability of a limited series of 10 mixes carried out by one operator of a 37 N/mm$^{2}$ PC/30% PFA concrete mix indicated that a significant improvement could be achieved following this type of control and normalisation.Cet article rend compte de l'effet d'une méthode d'essai améliorée pour un projet récent du CEN, méthode qui vise à mesurer la profondeur de carbonatation du béton durci, avec pour objet la réduction de la variabilité reconnue de l'essai. Ont été ainsi identifiées les variations dans les facteurs de l'environmennement susceptibles d'être responsables du manque de précision. À titre d'exemple, il a été démontré que l'hypothèse selon laquelle la ventilation naturelle fournirait le niveau de dioxyde de carbone et un taux d'humidité relative nécessaires est incorrecte. Ceci a abouti au développement d'un système de contrôle de l'environnement qui contrôle activement l'atmosphère de stockage. Est également proposé un procédé de normalisation en deux étapes de données, comprenant l'utilisation de deux mélanges ddditionnels qui s'ajoutent au mélange analysé. Les résultats de l'évaluation de la répétabilité d'une série limitée de dix mélanges de béton à 37 N/mm$^{2}$ ciment Portland/30% cendres volantes entrepris par un opérateur ont montré qu'une amélioration significative pouvait être obtenue en suivant ce type de contrôle et normalisation.
Starting Page	135
Ending Page	142
Page Count	8
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	33
Issue Number	2
e-ISSN	18716873
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
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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