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Influence of curing on cold mix mechanical performance

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Abstract

Cold mixes are evolutive materials, especially in their early life. Their initial cohesion is low and builds up gradually. The materials characteristics have to be evaluated at different states: fresh, mature, aged. An evaluation method is already available for fresh cold mixes. Ageing issues have been addressed elsewhere and are not dealt with here. Different curing procedures have been assessed and compared. Their goals are: laboratory curing must be related to field curing, the binder film must not be brought to an artificial state, no binder ageing must be caused by curing. Diverse curing sequences have been applied to grave-emulsion and dense wearing course mix. The effects of temperature, relative humidity and time have been evaluated. During each curing span, the mix moisture content has been monitored. The mechanical behaviour has been characterized by compressive strength and stiffness modulus (measured by indirect tensile testing). At the end of the varied curing periods, the bitumen was extracted and characterized. Special care has been taken in selecting the extraction method, to prevent any alteration of the bitumen. To establish a relationship between laboratory and field, the above results have been compared to those obtained on cores taken from similar mixes laid on roads. Finally, a new curing method has been selected and is proposed to road engineers.

Résumé

Les enrobés à froid sont des matériaux évolutifs, en particulier au jeune âge. Leur cohésion initiale est faible et angmente progressivement. Leurs caractéristiques mécaniques doivent être évaluées à plusieurs stades: état frais, mâture, vieilli. Une méthode d'étude existe pour les enrobés à froid à l'état frais. Les problèmes liés au vieillissement sont traités ailleurs. Différentes procédures de mûrissement ont été évaluées et comparées. Les buts visés se résument ainsi: le mûrissement en laboratoire doit être relié au mûrissement en place; le film de liant ne doit pas être remanié artificiellement; le mûrissement ne doit pas causer de vieillissement notable. Diverses séquences de mûrissement ont été effectuées sur des graves-émulsion et bétons bitumineux à froid. Les effets de la température, de l'humidité relative et de la durée ont été évalués. La teneur en eau a été suivie au cours de chaque mûrissement. Le comportement mécanique a été caractérisé par la résistance en compression et le module de rigidité (en traction indirecte). Après chaque période de mûrissement, le bitume a été extrait et caractérisé. La méthode d'extraction a été choisie de manière à ne pas créer de modification du bitume. Afin de relier le laboratoire et le chantier, les résultats ont été comparés à ceux obtenus sur échantillons carottés dans des couches de chaussées constituées de matériaux analogues. Une nouvelle méthode de mûrissement accéléré a ainsi pu être définie et est proposée aux ingénieurs routiers.

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Authors and Affiliations

  1. SCREG, France

    J. -P. Serfass & X. Carbonneau

  2. COLAS, France

    J. -E. Poirier & J. -P. Henrat

Authors
  1. J. -P. Serfass
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  2. J. -E. Poirier
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  3. J. -P. Henrat
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  4. X. Carbonneau
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Additional information

Editorial Note Presented at the 6th International RILEM Symposium on Performance Testing and Evaluation of Bituminous Materials (PTEBM'03), held on 14th–16th April 2003, in Zurich, Switzerland, this paper was selected as an outstanding communication and peer-reviewed by the Scientific Committee of the JournalMaterials and Structures.

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Serfass, J.P., Poirier, J.E., Henrat, J.P. et al. Influence of curing on cold mix mechanical performance. Mat. Struct. 37, 365–368 (2004). https://doi.org/10.1007/BF02481685

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