NDLI: A model for predicting time-dependent chloride binding capacity of cement-fly ash cementitious system

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A model for predicting time-dependent chloride binding capacity of cement-fly ash cementitious system

Content Provider	Springer Nature Link
Author	Sumranwanich, T. Tangtermsirikul, S.
Copyright Year	2004
Abstract	A model for predicting time-dependent chloride binding capacity of cement-fly ash cementitious systems was proposed. The proposed model took into account both chemical binding and physical binding. Chemical binding was considered to depend on the amount of unhydrated aluminated and aluminoferrite phases while physical binding depended upon the quantity of hydrated and pozzolanic products. The concept of time-dependent chloride binding capacity was introduced in the model with the consideration of curing time and chloride exposure period. The chloride binding of cement pastes and cement-fly ash pastes under different curing times and chloride exposure periods were tested. Three types of cement and two types of fly ash were used. From the experimental results, time-dependent behavior of chloride binding capacity was observed. At the same chloride exposure period, pastes with longer curing time prior to chloride exposure bound less chloride than those exposed with shorter curing time. Longer exposure period of paste resulted in larger chloride binding capacity. The analytical results from the model were verified with the experimental results from the authors and other researchers. The verification showed that the proposed model was satisfactory for predicting the chloride binding capacity of various cement and cement-fly ash cementitious systems.L'article présente un modèle capable de prévoir la capacité d'un mélange ciment-cendres volantes de fixer les ions chlorures. Il prend en compte à la fois les liaisons chimiques et les liaisons physiques. Les liaisons chimiques dépendent de la quantité d'aluminate non hydraté ainsi que de la quantité d'alumino-ferrite alors que les liaisons physiques dépendent de la quantité de produits hydratés et de la quantité de pouzzolane. La variable temporelle a été introduite afin de prendre en compte la durée de cure ainsi que la durée d'exposition aux chlorures. Trois types de ciment et deux types de cendres volantes ont été utilisés et plusieurs durées de cure et d'exposition aux chlorures ont été testées. Pour la même durée d'exposition au chlorure, les pâtes ayant un temps de cuisson plus long avant d'être exposées au chlorure ont une capacité de liaison du chlorure moindre que celles exposées avec des temps de cuisson plus court. Un autre résultat est que la capacité de fixer les ions chlorures augmente avec la durée d'exposition aux ions chlorures. Les résultats analytiques du model ont été confrontés aux résultats expérimentaux des auteurs de l'article ainsi qu'aux résultats publiés dans la littérature. Cette vérification a montré que les prédictions du model analytique sont conformes aux résultats de l'expérience.
Starting Page	387
Ending Page	396
Page Count	10
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	37
Issue Number	6
e-ISSN	18716873
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
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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