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

Title: Role of demoulding agents during self-compacting concrete casting in formwork
Author(s): C. Djelal, Y. Vanhove, P. De Caro, A. Magnin
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 35
Issue: 252
Issue date: 2002-10-01
Publication year: 2002
Pages: 470 - 476
Total Pages: 7
Nb references: 16
Language: English

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 SelfCompacting 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.
) of 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.

Online publication: 2002-08-17
Classification: Scientific Reports
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/12670