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09/06/2008

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BCV - Béton Composite Vicat – Vicat’s composite concrete

BCV

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DefinitionDefinitionBCV belongs to the « high performance concrete family, as

specified in the AFGC recommandationsBCV is a very compact matrix obtained by optimisation of

different parameters :Low ratio Water / Cement : 0,25High dispersive SuperplastifierOptimised granular skeleton (Dmax around 2 à 3 mm)

BCV is waterproof, non freezing and non reagent to salt for icy roads

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BCV’s CHARACTERISTICSBCV’s CHARACTERISTICS

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CharacteristicsCharacteristicsThere are 2 versions for BCV (one structural and one for

decoration/color).- 130 to 180 MPa compressive strenght, - 30/35 MPa flexural strenght- 10 MPa tensile strenght, depending on formulations.BCV allows a self spreading flow (BCV structure) or a self-

smoothing flow (BCV couleur) during 2 hours.The stripping of formeworks is possible at 16 h , thanks to a

compressive strenght of 40 Mpa. Possible use of steel fiber for reinforcement.No thermal treatments.

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Caractéristiques de MalaxageCaractéristiques de MalaxageB.C.VB.C.V.. is manufacturd in a classical precast unit or concrete

plant mixer.The use of a mixer equiped with a train-valseur and et

changeable power improve the mixing duration.Mixing of B.C.V.B.C.V. lasts around 8 to 10 minutes per batch.

These datas have to be verified along conformity tests done with the mixing means.

mixer equiped with a train-valseur

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BCVBCV manufacturing inmanufacturing in RomagnieuRomagnieu

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Fresch concrete CharacteristicsFresch concrete Characteristics

2 heures (de 5°C à 30°C)Rheological beheaviour

< 5%Air included

55 à 90 cmSpreading test with DIN cone

< 2500 kg/m3Density

ValuesTests

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ProjectProject «« lesles HouchesHouches »»

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Mechanical CharacteristicsMechanical Characteristics

110 MPaRc at 28 days (BCV without fibers)

8 MPaTensile strenght considered for calculation

24 MPaFlexural strenght (4 points)

150 MPaCompressive strenght (Rc) at 1 yr

130 à 180 MPa at 20°CCompressive strenght (Rc) at 28 days

strenghtEssais/tests

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1,1Abrasion C.N.R.

30 MPa (from 5°C to 30 °C)

Compressive strenght at 16 hours(adjuvants are different depending of temperature)

0,2Poisson’s ratio

44 GPaElastic modulus

Results of testsTests

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4 points flexural test

compressive stress vsdeformation

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Color Characteristics Color Characteristics

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Mastering the orientation of fibers is essential for the product.

In fact, the orientation of fibers influences two confidence criteria of the product :

Post-crack beheaviour of the material in a in-situ structure.

The level of the security coefficients to be taken into account in flexural-tensile structural calculations .

Orientation of fibres Orientation of fibres

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View from above

Side View

Flux

Flux

The fibers get oriented along the direction of flux .

Orientation of fibres Orientation of fibres RadiographyRadiography

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Improvement of tensile strenghtImprovement of tensile strenghtIn order to improve direct tensile strenght and flexural strenght, the product has to go through different phases :

1- mastering and understanding of the orientation of fibers

2- research of more strenghtful fibers, and on the mixing of fibers of different sizes (mezo-fibers theory)

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CALCULATIONCALCULATION METHODSMETHODS

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Different uses of BCVDifferent uses of BCV

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ApplicationsApplicationsBCV may be considered as a cold foundry material. It can be

used along 3 different ways :

BCV structure : for structures that need optimal resistances.

BCV mixte (two-layers) : for poured systemes needing both high resistance and a aesthetic facing

BCV color : for artistic structures, molded objects, …

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ApplicationsApplicationsBCV STRUCTURE

Bridge on A 51

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BCV STRUCTURE

Aurélien LEMONIER

ApplicationsApplications

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ApplicationsApplicationsBCV STRUCTURE

Coating Test for the mending of electrical posts

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ApplicationsApplicationsBCV MIXTE (2-layer Process)

Balcony

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ApplicationsApplicationsBCV DESIGN

Mathieu BETH/Olivier NOEL

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ApplicationsApplicationsBCV DESIGN

Mathieu BETH/Olivier NOEL

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ApplicationsApplicationsBCV COULEUR

Bicycle shed in Bern (Suisse)

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Benchs

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Kitchen and sinks

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Furniture

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