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Abstract
The perfecting of methods for identification and the laboratory evaluation of the quality and durability of roofing materials made with SBS are presented. It is possible to characterise these materials by chemical and rheological analysis. The parameters noted are: the composition of the mixture, polymer alphaltene, malthene and filler content, and the molecular weight of the polymer. For the rheological parameters, the compliance with stability under creep by traction, the recovery rate after creep, and the viscosity of the binding material are determined. This family of parameters is used to follow the evolution of bitumen SBS during artificial degradation tests in a ventilated oven at 70C and with a weatherometer. Under the effect of thermal or photochemical aging, a progressive disappearance of the elastic properties can be observed, due mainly to cuts in the SBS chains. It is shown that resistance to aging requires a sufficiently high initial SBS content, in association with good bitumen and polymer compatibility.
The perfecting of methods for identification and the laboratory evaluation of the quality and durability of roofing materials made with SBS are presented. It is possible to characterise these materials by chemical and rheological analysis. The parameters noted are: the composition of the mixture, polymer alphaltene, malthene and filler content, and the molecular weight of the polymer. For the rheological parameters, the compliance with stability under creep by traction, the recovery rate after creep, and the viscosity of the binding material are determined. This family of parameters is used to follow the evolution of bitumen SBS during artificial degradation tests in a ventilated oven at 70C and with a weatherometer. Under the effect of thermal or photochemical aging, a progressive disappearance of the elastic properties can be observed, due mainly to cuts in the SBS chains. It is shown that resistance to aging requires a sufficiently high initial SBS content, in association with good bitumen and polymer compatibility.
Date
9/1981
9/1981
Author(s)
Marechal, J
Marechal, J
Page(s)
452
452
Keyword(s)
SBS bitumen; composition; rheology; thermal weathering
SBS bitumen; composition; rheology; thermal weathering