Materials and Structures

, Volume 26, Issue 6, pp 355–361 | Cite as

Effect of heat-ageing on the thermal and mechanical properties of APP- and SBS-modified bituminous roofing membranes

  • I. Rodriguez
  • O. Dutt
  • R. M. Paroli
  • N. P. Mailvaganam
Article

Abstract

The effect of heat-ageing on four bituminous roofing membranes, two modified with atactic polypropylene (APP) and two modified with styrene-butadiene-styrene (SBS) was studied using tensile testing and dynamic mechanical thermals analysis (DMA). The samples were heated at 80°C for 7, 28, 84 and 168 days and were tensile tested at 23, 0, −10, −20 and −30°C. Each heat-aged sample was also subjected to thermomechanical testing to find its glass transition temperature T g . The results show significant variation in the effect of heat-ageing on tensile strength and elongation of membranes. T g values differ with the modifiers and other ingredients of the membranes and are affected by heat-ageing. The influence of the glass transition zone measured by DMA is also reflected in the tensile test results.

Keywords

Tensile Strength Asphalt Glass Transition Temperature Bitumen Dynamic Mechanical Thermal Analysis 

Resume

On a étudié l’influence du vieillissement par la chaleur sur quatre membranes d’étanchéité, deux d’entre elles étant traitées par APP (polypropylène atactique) et deux par SBS (styrène de styrène butadiène), à l’aide de l’essai en traction et de l’analyse thermique mécaniques (DMA). Les échantillons ont été chauffés à 80°C pendant 7, 28, 84 et 168 jours et essayés en traction à 23, 0, −10, −20 et −30°C. Chaque échantillon vieilli par la chaleur a été également soumis à un essai thermomécanique pour identifier sa température de passage à l’état vitreux T g .

Les résultats montrent des différences importantes dans l’influence de la chaleur sur la résistance en traction et l’allongement des membranes. Les valeurs de T g diffèrent selon les traitements et les autres composants des membranes, et sont affectées par le vieillissement par la chaleur. L’influence de la zone de passage à l’état vitreux mesurée par l’analyse thermique mécainique se traduit aussi dans les résultats de l’essai en traction.

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Copyright information

© RILEM 1993

Authors and Affiliations

  • I. Rodriguez
    • 1
  • O. Dutt
    • 2
  • R. M. Paroli
    • 2
  • N. P. Mailvaganam
    • 2
  1. 1.Laboratorio Central de Estructuras y Materiales (CEDEX)MadridSpain
  2. 2.Institute for Research in ConstructionNational Research Council of CanadaOttawaCanada

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