Low-Temperature Characterization of Hot-Poured Crack Sealant by Crack Sealant Direct Tensile Tester

A modified direct tensile tester method was developed to enable correlate the properties of hot-poured bituminous crack sealants with field performance, especially at low temperatures. The research included a sensitivity analysis of loading rates, sample lengths, and cross-section areas to define both optimal specimen geometry and the testing protocol. Two types of sealants, having a wide range of rheological behaviors (one polymer-modified and one having crumb rubber), were tested at the lowest expected service temperature. low temperature. A performance parameter - strain energy density - was proposed to differentiate crack sealant material in the laboratory.Une m\ue9thode \ue0 modulom\ue8tre direct modifi\ue9 a \ue9t\ue9 mise au point dans le but de permettre de corr\ue9ler les propri\ue9t\ue9s des scellants pour fissures bitumineux coul\ue9s \ue0 chaud et la performance in situ, plus particuli\ue8rement aux temp\ue9ratures basses. Cette recherche comprenait une analyse de sensibilit\ue9 des taux de charge, des longueurs des \ue9chantillons et des aires de coupes transversales, dans le but de d\ue9finir tant la g\ue9om\ue9trie optimale du sp\ue9cimen que le protocole d'essai. Deux (2) types de scellants dot\ue9s d'une gamme \ue9tendue de comportements rh\ue9ologiques (l'un modifi\ue9 aux polym\ue8res et l'autre contenant du caoutchouc granulaire), ont \ue9t\ue9 mis \ue0 l'essai, \ue0 la temp\ue9rature de service la plus basse pr\ue9vue. Un param\ue8tre de performance, soit la densit\ue9 d'\ue9nergie de d\ue9formation, a \ue9t\ue9 propos\ue9 pour fin de diff\ue9renciation en laboratoire de la mati\ue8re du scellant pour fissures.Peer reviewed: YesNRC publication: Ye