Abstract
A laboratory investigation was conducted to study different types of polymer-modified asphalt with regard to low temperature behaviour. The thermal stress restrained specimen test (TSRST) was used to assess the disposition of asphalt mixtures to cracking at low temperature. Five polymer modified bitumens and three mixture types (dense graded, stone mastic and porous asphalt) were investigated. In addition, three different “gussasphalt” mixtures were analysed. Based on the results obtained, it was concluded, among other things, that (1) the polymer type, mixture type and degree of ageing influence the low temperature properties of asphalt mixtures; (2) the increase in fracture temperature during ageing is dependent on mixture and polymer type; (3) the use of modified binders may improve the low temperature properties of ‘gussasphalt” mixtures.
Résumé
Une étude de laboratoire a été conduite afin d'évaluer le comportement aux basses températures d'enrobés formulés avec des bitumes modifiés aux polymères. La résistance à la fissuration à froid a été étudiée par des essais de retrait empêché («Thermal Stress Restrained Specimen Test—TRSRT»). Cinq bitume-polymères ainsi que trois types d'enrobés (enrobé dense «classique», enrobé dense à forte teneur en mastic du type «SMA», et enrobé drainant) ont été étudiés. L'étude a également porté sur trois formulations d'asphalte coulé (type «Gußasphalt»). Sur la base des résultats obtenus, il a pu être conclu, entre autres, que: (1) la nature du polymère et le type de l'enrobé, ainsi que le degré de vieillissement, influencent le comportement à froid des enrobés bitumineux; (2) l'accroissement de la température de fissuration en fonction du degré de vieillissement dépend du type d'enrobé et de la nature du polymère; (3) l'utilisation de bitumes modifiés peut améliorer les propriétés à froid des asphaltes coulés de type «Gußasphalt».
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Editorial note Mr. Ulf Isacsson is a RILEM Senior Member. He is a member of TC 152-PBM on Performance of Bituminous Materials.
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Isacsson, U., Zeng, H. Low-temperature cracking of polymer-modified asphalt. Mat. Struct. 31, 58–63 (1998). https://doi.org/10.1007/BF02486415
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DOI: https://doi.org/10.1007/BF02486415