The Influence of the Carbo-Glass Geogrid-Reinforcement on the Fatigue Life of the Asphalt Pavement Structure / Wpływ Zbrojenia Siatka Weglowo–Szklana Na Trwałosc Zmeczeniowa Asfaltowej Nawierzchni Drogowej

Abstract

This paper describes the analyses of the fatigue life of the asphalt pavement reinforced with geogrid interlayer under traffic loading. Finite Element ANSYS package with using nCode applications, as well as macros specially designed in APDL programming script and VBA were used to model the considered problem. Our analysis included computation of stress, fatigue life, damage matrix and rainflow matrix. The method applied was the one of fatigue calculation: stress -number of cycles in short S-N. On the basis of the performed high cycle fatigue analysis, the influence of the location of the used geogrid and of its bond with asphalt layers on the fatigue life and the work of the asphalt pavement structure were determined. The study was carried out for three temperature seasons i.e. spring and fall (assumed as one season), winter and summer. The variability of the traffic conditions were taken into account by assuming weekly blocks of traffic loading. The calculations were made using the real values of loading measured in field tests on the German highways by means of HS-WIM weighing system. As a result of the performed tests, it was proved that the use of geogrid-reinforcement may prolong the fatigue life of the asphalt pavement. However, it is required that: the geogrid should be located in the tension zone as low as possible in the structure of the asphalt layers. Moreover, it is necessary to provide high stiffness of the bond between the geogrid and the asphalt layers.

Comparison of temperature distributions in road pavement obtained in field tests and using transient thermal analysis

“…In order to predict the behavior of newly designed pavement structures, it is therefore necessary to apply modeling, e.g. using the Fourier-Kirchhoff heat transfer equation (3).…”

“…There are also numerous field observations using roadside meteorological stations. Using the results of such tests and measurements, numerous analyzes are carried out on pavements taking into account thermal factors [2][3][4][5][6][7][8][9][10][11][12].…”

Application of Digital Image Correlation (DIC) Method for Road Material Testing

“…Geosynthetics research was carried out on the three types of reinforcing geogrids: biaxial glass fibre geogrid, biaxial polyester fibre geogrid and triaxial hexagonal polypropylene geogrid. Glass fibre geogrids are designed for the reinforcement of asphalt layers [31,32,33]. Polyester geosynthetics are used in transportation engineering to strengthen a weak soil substrate, reinforce embankments and to stabilise landslides [34,35,36].…”

Relationship between deflection basin parameters and backcalculated pavement layer moduli

“…The use of the geosynthetic layer as a subgrade reinforcement under mining influences in flexible pavement construction has been widely described [1][2][3][4][5]. The application directly on top of the old asphalt layer under the overlay allows delay or prevents crack propagation between layers [6][7][8][9][10][11]. The increase in pavement fatigue resistance was proven.…”