NDLI: Long-term moisture transport in high performance concrete

Content Provider	Springer Nature Link
Author	Nilsson, L. O.
Copyright Year	2002
Abstract	Moisture is decisive for a large number of binding and transport processes in high performance concrete affecting the durability, shrinkage and performance in various environments. An experimental study on the moisture transport properties of 20 concrete mixes was made during seven years, with type of binder, additives and waterbinder ratio as parameters. An upside-down glass cup method was used to obtain the steady-state flow through concrete discs.The moisture diffusion coefficient decreases with a lower water-binder ratio, increasing amount of silica fume, especially when combined with fly ash and it continues to decrease also after four years for w/B lower than 0.40. The moisture diffusion coefficient is much less moisture dependent for HPC than for normal concrete, which means that steady-state moisture profiles through HPC structures will be almost linear. Long-term moisture profiles in submerged HPC will be affected by self-desiccation for a very long time because of the extremely small moisture flow.L'humidité a une influence prépondérante sur un grand nombre de processus d'interaction et de transport qui affectent de manière directe la durabilité, le retrait et le comportement des bétons à haute performance (BHP) soumis à différents types de conditions d'exposition. Une étude expérimentale sur les propriétés de transport d'humidité de 20 mélanges de béton a été effectuée durant une période de sept ans. Les variables étudiées concernaient le type de ciment et d'ajouts ainsi que le rapport eau/liant. Une procédure spéciale a été utilisée de manière à être en mesure de réaliser les essais de transfert d'humidité en régime permanent.Les résultats des essais indiquent que le coefficient de diffusion d'humidité diminue avec une réduction du rapport eau/liant, une augmentation de la teneur en fumée de silice, tout particulièrement lorsque celle-ci est utilisée avec des cendres volantes. Pour des bétons de rapports eau/liant inférieurs à 0,40, la réduction du coefficient d'humidité se poursuit toujours même après 4 ans d'hydration. Le coefficient de diffusion d'humidité des BHP semble être beaucoup moins sensible à la teneur en eau que celui des bétons ordinaires ce qui signifie que les profils d'humidité en régime permanent sont presque linéaires. Les profils d'humidité à long terme dans BHP submergés seront fortement affectés par l'autodessiccation.
Starting Page	641
Ending Page	649
Page Count	9
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	35
Issue Number	10
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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