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

Spitz, N.; Coniglio, N.; Mansori, Mohamed El; Montagne, Alex; Mezghani, S.

doi:10.1016/j.surfcoat.2018.07.098

Cited by 20 publications

(22 citation statements)

References 31 publications

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“…The S a parameter, associated to the ability to trap cement particles, was 0.9 µm for the bare formwork skin, in agreement with data reported by Libessart et al [11][12], and 2.5 µm for the coating. According to the cement particle size distribution measured by ASTMsponsored round-robin tests [34], around 5% and 15% of the finest cement particles would penetrate into the surface of the bare and coated formwork respectively, suggesting an enhanced cement-to-formwork mechanical adherence [35] and friction [36] with the use of the coating.…”

Section: Surface Topography Characterizationmentioning

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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Section: Surface Topography Characterizationmentioning

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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“…Les différents travaux conduits sur l'influence de la rugosité dans le contexte du coffrage rapportent essentiellement une caractérisation de la rugosité suivant le paramètre de rugosité de profil Ra, parfois Rt. Certains auteurs [11,28] élargissent la caractérisation à d'autres paramètres. Les paramètres de profil comme par exemple Ra sont souvent utilisés pour caractériser les morphologies de surface [30].…”

Section: Rugosité De Surface Des Coffrages 2221 Evaluation De La Runclassified

“…Afin de définir des parois qui offrent des facilités de séparation avec le béton, il faut analyser les paramètres influençant l'adhésion coffrage/béton. De nombreux auteurs ont étudié l'interface béton/agent de démoulage/coffrage [2][3][4][5][6][7] et la formation de la peau du béton en contact avec l'agent de démoulage et/ou la paroi [5,[8][9][10][11]. Cette peau, dont l'épaisseur varie du micromètre au centimètre selon la nature du béton, du coffrage et de la cure [12], est constituée principalement de ciment en surface.…”

Section: Introductionunclassified

“…Une corrélation entre les paramètres de rugosité et l'adhérence ainsi qu'entre composition du ciment et adhérence est étudiée. En effet, peu de travaux ont étudié l'effet des caractéristiques de surface du coffrage sur la capacité du béton à adhérer à celle-ci [11]. De plus, dans le but de proposer des matériaux cimentaires plus écorespectueux et plus durables, l'influence de l'incorporation d'un adjuvant biosourcé est analysée.…”

Section: Introductionunclassified

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Influence d’un bioadjuvant sur l’adhésion du ciment sur parois coffrantes et évaluation de l’effet de la rugosité des parois coffrantes

Chadfeau

Mohseni

Omary

et al. 2020

Matériaux & Techniques

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L’objectif de ce travail est de comprendre comment l’adhésion entre le ciment et le coffrage est influencée par la morphologie de la surface du coffrage et l’ajout d’un bioadjuvant. L’ancrage mécanique de la pâte cimentaire est en effet lié à la rugosité de surface du coffrage. Une procédure de caractérisation morphologique des surfaces en contact, coffrage et ciment, est développée par microscopie interférométrique. Elle permet de retenir une échelle d’observation pour laquelle les valeurs des paramètres d’états de surface Sa, Sq, Sdr, Vvc et Vvv, sont représentatifs de la morphologie de surface. Trois états de surface de coffrage différents sont obtenus par polissage et sont caractérisés à l’échelle d’observation. Les paramètres de surfaces sont corrélés avec les performances au décoffrage pour ces trois états de surface. L’action d’un bioadjuvant sur les phénomènes d’adhésion tant au niveau des efforts de décoffrage que de la qualité de parement est évaluée pour trois taux d’incorporation de bioadjuvant. Les résultats mettent en évidence qu’un degré de polissage spécifique combiné à l’utilisation d’un taux de bioadjuvant minimum dans la pâte cimentaire permettent d’atteindre des performances au décoffrage équivalentes à celles obtenues avec un agent décoffrant classique.

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“…According to p.5.3.6 of common standard 70.13330.2012, concreting procedure should be developed with provision of concrete joint location, subject to erection technology for the building and the structure, as well as to its construction peculiarities; whereas, necessary ruggedness of concrete-surface contact within the concrete joint, as well as ruggedness of the structure subject to concrete joint availability, must be ensured. However, according to article authors, observance of only joint arrangement technology is insufficient to provide for ruggedness of the whole structure; therefore, it is necessary to consider issues of formwork dismantling [9][10][11] in construction joint locations.…”

Section: Fig 1 а Construction Joint Top Of Slab B Construction mentioning

confidence: 99%

Arrangement of construction joints in cast-in-place slabs

Yakovleva

Kurochkina

2019

E3S Web Conf.

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Within latest decades cast-in-place construction of residential houses has been actively developed. Works on erection of cast-in-place frame of the building are normally performed by phases, which results in a necessity to arrange construction joints of concreting. In accordance with regulatory documents, it is allowed to arrange construction joints in any place of the slab, in parallel with its less side. As well, it is necessary to observe the technology for joint arrangement. As practice shows, observing only technology of construction joint arrangement is insufficient to provide for strength properties of cast-in-place reinforced-concrete slabs. This article provides an analysis of actual geodetic pre-construction surveys, design and theoretically-calculated solutions; case study is a multistoried building under construction. On which basis, excessive slab deflections in the places of construction joints, were detected. It is established, that the main reason for deflection occurrence is early removal of slab formwork and installation of supports for temporary supporting. On the basis of obtained findings authors make conclusions regarding compulsory observance of the technology for construction joint arrangement, regarding a necessity to remove formwork according to common standards 70.13330.2012; as well, it is recommended to leave formwork under construction joints until concrete gains 100% of ruggedness.

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

Abstract: is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible.

Cited by 20 publications

References 31 publications

On functional signatures of bare and coated formwork skin surfaces

On functional signatures of bare and coated formwork skin surfaces

Influence d’un bioadjuvant sur l’adhésion du ciment sur parois coffrantes et évaluation de l’effet de la rugosité des parois coffrantes

Arrangement of construction joints in cast-in-place slabs

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