کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
257228 | 503580 | 2015 | 10 صفحه PDF | دانلود رایگان |
• Correlation established between interfacial properties and demoulding performances.
• The influence of the composition of the oil formulations was studied.
• Surface state of the formwork (new, used, and polished) was taken into account.
• Interfacial properties of vegetable oils are favourable to the criteria of demoulding.
• A minimal level of adhesion energy was found to get aesthetical facings.
To ensure an easy demoulding of the concrete, the release agent must form a homogeneous film on the formwork to resist the casting concrete. The adherence of oil with the support was studied via the solid/liquid energy adhesion. This energy was calculated using the Zisman equation involving the angle of drop and the surface tension. Various formulations were studied, in order to establish correlations between their composition and the interfacial properties. Formwork release tests were performed to assess cladding aesthetics; it was possible to define a minimal level of adhesion energy to meet the facings quality after concrete demoulding.
Journal: Construction and Building Materials - Volume 76, 1 February 2015, Pages 130–139