Correlation between adhesion energy of release agents on the formwork and demoulding performances

Libessart, Laurent; de, Pascale; Djelal, Chafika; Dubois, Isabelle

doi:10.1016/j.conbuildmat.2014.11.061

Cited by 22 publications

(20 citation statements)

References 16 publications

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“…The lubricant family, i.e. vegetal or mineral [11] [12], the environment temperature [10] and the application mode [13] are also of major importance.…”

Section: Introductionmentioning

confidence: 99%

On functional signatures of bare and coated formwork skin surfaces

Spitz

Coniglio

Mansori

et al. 2018

Construction and Building Materials

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The sticking of the concrete on metallic formworks during building construction generates many concrete wall defects. Several solutions have been proposed, among which surface lubrication and polymeric coatings are commonly applied. In this paper, the main functional signatures of a steel formwork skin and a polymeric coating were determined to understand their effect on the concrete sticking. The topographical, chemical and mechanical signatures of the surfaces were characterized at near-surface regions. The top of the steel formwork a 10 µm-thick layer is constituted of two oxides each one having specific tribological properties. Adding the polymeric coating on the formwork skin surface lowers its surface tension, which lowers the sticking by reducing the wettability. Moreover, the smaller roughness of the coating limits the susceptibility of mechanical anchoring. Nevertheless, scratch testing suggests a short durability of the polymeric coating due to its weak resistance to abrasion.

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“…The lubricant family, i.e. vegetal or mineral [11] [12], the environment temperature [10] and the application mode [13] are also of major importance.…”

Section: Introductionmentioning

confidence: 99%

On functional signatures of bare and coated formwork skin surfaces

Spitz

Coniglio

Mansori

et al. 2018

Construction and Building Materials

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show abstract

“…Other works on the concrete-skin interface observed that the adherence is partially avoided by condensing a water layer on the skin [14], adding a polymer coating [5], [15], or applying release agents on the skin [4], [8], [9], [16] prior to concrete casting. In particular, the lubricant family, i.e.…”

Section: Adherence Mechanismmentioning

confidence: 99%

“…In particular, the lubricant family, i.e. vegetal or mineral [4], [16], the environment temperature [9] and the application mode are of major importance [8]. Based on the review, concrete-formwork bonding strength can be reduced by: deposition of release agents, minimizing vibrations during pouring, roughness optimization to favor a Cassie-Baxter wetting regime, and stopping the electrical double layer formation.…”

Section: Adherence Mechanismmentioning

confidence: 99%

“…Thus, mechanical vibrations of the formwork during pouring enhances the cement particle penetration in the superficial asperities [5] leading to high bonding strength. Bonding is also lowered by the presence of a residual humidity film at the interface that hinders the penetration of concrete fines [2]- [4]. Subsequently, mechanical anchoring is lowered for formworks with controlled roughness and superficial hydrophobicity.…”

Section: Adherence Mechanismmentioning

confidence: 99%

“…The induced concrete-formwork bond is stronger for smooth and impermeable skins such as steel formworks [2]- [4], [14]. Absorption of water at the formwork surface [2]- [4], such as for wood formworks, or hydrophobic surfaces [27] prevent the formation of the continuous interfacial water film and consequently the capillary forces.…”

Section: Adherence Mechanismmentioning

confidence: 99%

See 2 more Smart Citations

Quantitative and representative adherence assessment of coated and uncoated concrete-formwork

Spitz

Coniglio

Mansori

et al. 2018

Surface and Coatings Technology

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Synthesis and characterization of release agent from used cooking oil at the concrete/formwork interface

Libessart

Anceur

Djelal

et al. 2023

Int. J. Environ. Sci. Technol.

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For this preliminary study, the lubricating properties of six formulations containing used cooking oils were tested. The physicochemical properties involved were determined by measuring viscosities at temperatures between 0° and 40°C as well as by calculating adhesion energies. The formwork/concrete interface was then studied on the steel surface by means of both tribological measurements and analysis of facing quality at 1 day and 7 days after stripping. The results obtained were compared with a marketed vegetable-based oil. The physicochemical results revealed attractive parameters despite a viscosity that remained high. The liquid/vapor surface tensions and wettabilities measured satisfied the recommendations, i.e. greater than 30 mN/m and less than 30°. The selected formulation offered the best compromise between composition and the physicochemical recommendations. At the formwork/concrete interface and for a scraped application, satisfactory criteria were derived, with a 35% reduction in friction and an acceptable facing quality for this initial study.

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Correlation between adhesion energy of release agents on the formwork and demoulding performances

Cited by 22 publications

References 16 publications

On functional signatures of bare and coated formwork skin surfaces

On functional signatures of bare and coated formwork skin surfaces

Quantitative and representative adherence assessment of coated and uncoated concrete-formwork

Synthesis and characterization of release agent from used cooking oil at the concrete/formwork interface

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