NDLI: Application of factorial models to predict the effect of anti-washout admixture, superplasticizer and cement on slump, flow time and washout resistance of underwater concrete

Content Provider	Springer Nature Link
Author	Sonebi, M. Tamimi, A. K. Bartos, P. J. M.
Copyright Year	2000
Abstract	The anti-washout underwater concrete posses different properties from conventional underwater concrete. When an anti-washout admixture is mixed with concrete, the viscosity of the concrete is increased and its resistance to washout is enhanced. Superplasticizer ensures enough concrete fluidity to spread readily in place without vibration. A factorial design was carried out to mathematically model the influence of three key parameters on slump, flow time measured by Orimet and mass loss by washout of underwater concrete. The parameters considered in this investigation were the dosage of cement, the concentrations of anti-washout admixture and superplasticizer. All mixes were made with 0.43 water/cement ratio which correspond a typical underwater concrete. The proposed models are valid for concretes with cement dosage ranging between 420 kg/m$^{3}$ to 520 kg/m$^{3}$ and the concentrations of anti-washout admixture and superplasticizer varying between 0.02%–0.13% and 0.4%–1.8%, by mass of cement, respectively.Test results of the models indicated that the slump is highly affected, in order of importance, by dosage of cement and the dosage of superplasticizer, then by the concentration of anti-washout admixture. The mass loss by washout is influenced, in order of significance, by the concentration of anti-washout admixture, the dosage of cement, the concentration of superplasticizer and the interaction between the dosages of cement and anti-washout admixture. The flow time is affected, in order of importance, by the dosage of cement, the concentration of superplasticizer and the interaction between these parameters. This model can be used as a tool to facilitate the test protocol required to optimise the underwater concrete.Le concept du béton sous l'eau contenant un agent colloïdal anti-lessivage est différent de celui du béton conventionnel. En ajoutant un agent colloïdal, la viscosité du béton est augmentée et la résistance au lessivage est améliorée. L'utilisation du superplastifiant assure une bonne fluidité permettant ainsi une mise en place du béton sous l'eau sans vibration. Un plan factoriel a été établi pour étudier mathématiquement l'effet de trois paramètres clés sur l'affaissement, le temps d'écoulement mesuré par l'appareil Orimet et la perte de masse par lessivage. Les paramètres étudiés sont le dosage en ciment, les concentrations en agent colloïdal et en superplastifiant. Tous les mélanges sont fabriqués avec un rapport eau/ciment de 0,43 qui correspond à un béton typique coulé sous l'eau. Les modèles proposés sont valides pour des bétons ayant des dosages en ciment situés entre 420 et 520 kg/m$^{3}$ et en agent colloïdal et en superplastifiant variant respectivement de 0,02% à 0,13% et 0,4% à 1,8% de la masse de ciment.Les résultats des modèles montrent que l'affaissement est sensiblement affecté, dans l'ordre, par le dosage en ciment, le dosage en superplastifiant et enfin celui en agent colloïdal. Alors que le lessivage est influencé, par l'ordre d'importance, par les dosages de l'agent colloïdal, du ciment et du superplastifiant ainsi que par l'interaction entre les dosages en ciment et agent colloïdal. Le temps d'écoulement est affecté par les dosages de ciment et du superplastifiant ainsi que par leur interaction. Ces modèles peuvent être utilisés en tant que moyens d'aide à l'optimisation du béton sous l'eau.
Starting Page	317
Ending Page	323
Page Count	7
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	33
Issue Number	5
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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