The judicious pavement design is the key factor in achieving the longest service life and the lowest maintenance and rehabilitation costs. It is based on the consideration of the phenomena in which the pavement structures are subjected to exploitation and the limitation of their destructive effects.The aim of this study is to verify the possibility of implementing in the flexible pavement structures design practice of another design criterion based on limiting the bituminous mixtures creep phenomenon and that to be called: The criterion of admissible octahedral shear stresses in the bituminous layers.Estimation of octahedral shear stresses is done with a calculation model based on finite element method, and hereafter referred to as 2D ASFEM (2D Axi-Symmetric Finite Element Model). The paper presents the results obtained by modeling several specific calculation assumptions for the behaviour of flexible pavement structures in service.The study underlines the fact that the Octahedral Shear Stresses Ratio (OSSR) can be an additional design criterion to be taken into account when designing flexible pavement structures alongside other established criteria. Keywords: flexible pavement structures, octahedral shear stresses, permanent deformation RésuméLa conception judicieuse des structures de chaussée est le facteur clé pour atteindre la durée de vie la plus longue et les coûts d'entretien et de réhabilitation les plus bas. Il est basé sur la prise en compte des phénomènes dans lesquels les structures de chaussée sont soumises à l'exploitation et la limitation de leurs effets destructeurs.Le but de cette étude est de vérifier la possibilité de mettre en oeuvre dans la pratique de conception de structures de chaussées flexibles un autre critère de conception basé sur la limitation du phénomène de fluage des mélanges bitumineux: Le critère des contraintes de cisaillement octaédrique admissibles dans les couches bitumineuses.L'estimation des contraintes de cisaillement octaédriques est faite avec un modèle de L'étude souligne le fait que le Ratio de Contraintes de Cisaillement Octaédrique (RCCO) peut être un critère de conception additionnel à prendre en compte lors de la conception de structures de chaussées flexibles parallèlement à d'autres critères établis.
This paper aims to establish the interface conditions influence on the flexible pavement structures life. The methodology consists in using the interface constitutive model available in the Alizé calculation program to calculate the stresses and strains in the flexible pavement structures.The design criteria related to limiting fatigue cracking of asphalt layers and permanent deformations at the subgrade level from the road bed are used to estimate the flexible pavement structures lifetime.When calculating the critical stresses and strains, most mechanical design methods of the flexible pavement structures considers that the road layers at interfaces are perfect bonded or total unbonded.Proper modeling of the interface binding condition is an important aspect in understanding the real behaviour of in-service flexible pavement structures. Keywords: interface conditions, flexible pavement structure, life RésuméCe document vise à établir l'influence des conditions de l'interface sur la vie des structures routières souples. La méthodologie consiste à utiliser le modèle constitutif d'interface disponibles dans le programme de calcul Alizé pour calculer les contraintes et déformations dans les structures routières souples.Pour estimer la durée de vie des structures routières souples, critères de dimensionnement sont utilisés pour limiter la fissuration par fatigue des couches d'asphalte et des déformations permanentes au niveau du sol du lit de la route.Dans le calcul des contraintes et déformations spécifiques critiques, la plupart des méthodes mécaniques de la conception de structures routières souples estime que les couches de la route au niveau des interfaces sont parfaites liées ou totale non liée.
Asphalt mixtures are mixtures of mineral aggregates, filler, bitumen and eventually additives in proportions determined by recipe designed in the laboratory. Asphalt mixtures used as base course are bituminous concrete. The natural aggregates are granular materials of mineral origin that come from natural or artificial crushing of the rocks. In our country there are the various rocks: eruptive or magmatic rocks, metamorphic rocks, sedimentary rocks. To the category of sedimentary rocks belong limestone. Sedimentary rocks are characterized by relatively high porosity and a pronounced stratification, which causes mechanical resistance to be low and vary by direction of load. Due to the structure less dense and weaker mechanical resistance, the limestone are used less in heavy traffic pavement structures. This paper presents an asphalt mixture recipe for the base layer developed in the Laboratory of Roads from Technical University of Civil Engineering Bucharest (TUCEB), using limestone aggregates extracted from Hoghiz Quarry. The paper contains laboratory test results to determine the recipe and laboratory findings leading to the schedule of product.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.