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Role of demoulding agents during self-compacting concrete casting in formwork

Djelal, C. / Vanhove, Y. / De Caro, P. / Magnin, A.

Abstract The use of “super-plasticisers” to obtain concretes that are highly workable, easy to place in formwork and require no vibration has spread throughout Europe in the last few years. The placing process for fresh so-called Self-Compacting Concrete (SCC) is linked to the friction that occurs at the concrete/wall interface. A rectilinear movement tribometer has been developed. Tests performed with certain modifications of the interface conditions show that friction is governed by the characteristics (viscosity, tensioactivity, etc.) on the demoulding agents used. The interface appears to undergo two types of phenomena.-shear stress in the thick lubricating layer, which entails low shear stresses.-granular behaviour. The shear stress is higher in the second case.

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Role of demoulding agents during self-compacting concrete casting in formwork

Djelal, C. / Vanhove, Y. / De Caro, P. / Magnin, A.

Abstract The use of “super-plasticisers” to obtain concretes that are highly workable, easy to place in formwork and require no vibration has spread throughout Europe in the last few years. The placing process for fresh so-called Self-Compacting Concrete (SCC) is linked to the friction that occurs at the concrete/wall interface. A rectilinear movement tribometer has been developed. Tests performed with certain modifications of the interface conditions show that friction is governed by the characteristics (viscosity, tensioactivity, etc.) on the demoulding agents used. The interface appears to undergo two types of phenomena.-shear stress in the thick lubricating layer, which entails low shear stresses.-granular behaviour. The shear stress is higher in the second case.

Role of demoulding agents during self-compacting concrete casting in formwork

Djelal, C. / Vanhove, Y. / De Caro, P. / Magnin, A.

Abstract The use of “super-plasticisers” to obtain concretes that are highly workable, easy to place in formwork and require no vibration has spread throughout Europe in the last few years. The placing process for fresh so-called Self-Compacting Concrete (SCC) is linked to the friction that occurs at the concrete/wall interface. A rectilinear movement tribometer has been developed. Tests performed with certain modifications of the interface conditions show that friction is governed by the characteristics (viscosity, tensioactivity, etc.) on the demoulding agents used. The interface appears to undergo two types of phenomena.-shear stress in the thick lubricating layer, which entails low shear stresses.-granular behaviour. The shear stress is higher in the second case.

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Title:

Role of demoulding agents during self-compacting concrete casting in formwork

Contributors:

Djelal, C. (author) / Vanhove, Y. (author) / De Caro, P. (author) / Magnin, A. (author)

Published in:

Materials and Structures ; 35

Publication date:

2002

ISSN:

DOI:

https://doi.org/10.1007/BF02483134

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Friction Stress , Concrete Friction , Contact Pressure , Concrete Sample , Interface Agent

Classification:

BKL: 56.45 Baustoffkunde / 51.30 Werkstoffprüfung, Werkstoffuntersuchung
Local classification TIB: 275/6500 / 250/6500

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