Tribological behaviour of self compacting concrete

Djelal, Chafika; Vanhove, Yannick; Magnin, Albert

doi:10.1016/j.cemconres.2003.09.013

Cited by 41 publications

(25 citation statements)

References 3 publications

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“…The adhesion is avoidable with a controlled skin roughness that is low enough to avoid mechanical anchoring and high enough to avoid capillary forces [2]- [5] or with a controlled skin chemistry using a special galvanized superficial treatment [6]. The wear resistance to the concrete abrasion is reduced by smoothing the surface [14]. Despite these works, the topic of adhesion as it applies to skin-concrete interactions remains a contentious subject, particularly with regard to identifying the skin superficial characteristics that would ideally avoid concrete adhesion without lubricant spreading.…”

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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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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“…This device has already been described in several publications. 15,16 The friction or tangential stress is defined as follows ô f ¼ Measured force À Parasitic force Section of sample holder F par is the result of the parasitic friction forces caused by the seal against the plate. The area of the contact surface between the concrete and the plate is calculated from the diameter of the sample holder.…”

Section: Tribometer Principlementioning

confidence: 99%

Influence of the nature of the demoulding agent on the properties of the formwork–concrete interface

Djelal²,

Libessart³

et al. 2007

Magazine of Concrete Research

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Release agents are a significant source of pollution in the construction and prefabrication industries. Conventional products are known to be toxic for humans and the environment. New formulations based on vegetable esters have appeared on the market to mitigate against this drawback. However, more knowledge is required about the properties and behaviour of these products to make them more attractive for industry. Understanding the phenomena that occur over the formwork-oil-concrete interface is a real challenge. The present paper begins with a physicochemical survey of release agents by defining the formwork-oil and oil-concrete interfaces. It then characterises the formwork-oilconcrete interfaces by dynamic studies (tribometer). Physicochemical mechanisms are proposed.

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“…A este respecto cabe citar los trabajos desarrollados recientemente en el Laboratorio de Reología del CEDEX de Grenoble (18)(19), utilizando un aparato de corte directo especial denominado tribómetro, que registra los esfuerzos tangenciales producidos al provocar el deslizamiento del hormigón fresco sobre diferentes superficies encofrantes. El valor del coeficiente de fricción depende de diversas variables como la velocidad de vertido del hormigón, el tipo de mezcla utilizada o el uso de desencofrantes.…”

Section: Determinación De Las Propiedades Mecánicas Del Hormigón Frescounclassified