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2. Interactions with formwork and release agents
2.1 Influences of release oils
The role of form release agents, often composed of mineral- or vegetable-based oils, is to maintain a film of water at the interface between formwork and fresh concrete, and to perpetuate the lubricating effect of this layer in order to limit excessive shear forces (the layer of water at the interface between formwork and fresh concrete can be destroyed by aggregates approaching the surface, or can be weakened by the texture of the formwork). In most cases, friction at the interface between formwork and fresh concrete is not sufficient to completely destroy the micrometer-thick film of oil present on
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Bibliography
- (1) - VERNET (C.), LUKASIK (J.), PRAT (E.) - Nanostructure, porosity, permeability, and diffusivity of Ultra high performance concretes (UHPC). – - Proceedings of the International Symposium on High Performance Concrete and Reactive Powder Concrete, Edited by AITCIN (P.C.) and DELAGRAVE (Y.), p. 17 (1998).
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Standards and norms
- ISO Acoustique : méthode de calcul du niveau d'isotonie. - ISO 532 1975 ISO - 1975
- AFNOR Tests for fresh concrete – Part 5: Impact table spread test - NF EN 12350-5 AFNOR - 2005
- AFNOR Clay roof tiles for discontinuous laying – Determining physical characteristics – Part 1: Impermeability test - NF EN 539-1 AFNOR - 2006
- ISO Fine ceramics (advanced ceramics, advanced technical ceramics) – Test method...
Patents
Concrete element having a superhydrophobic surface WO2011095744.
Use of a concrete-based element for the treatment of gases and volatile compounds EP2488279, WO2011045509.
Concrete article comprising a surface with low open porosity EP2603471, WO2012020012.
Cement-based paving blocks for photocatalytic paving for the abatement of urban pollutants EP1601626....
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