Pavement Reinforcement Research Articles

Comparative Modeling Study of Reinforced Beam on Elastic Foundation

In this paper, governing ordinary differential equations are derived for a reinforced Timoshenko beam on an elastic foundation. An analytical solution is obtained for a point load on an infinite Timoshenko beam on elastic foundation. Special attention is drawn to the location, tension, and shear stiffness of reinforcement and its influence on settlement/deflection of the beam and reinforcement tension force. A finite element (FE) model is established for the same infinite beam problem. Results from the proposed TB model (Timoshenko beam on elastic foundation) are compared with results from the FE model and from the PB model (the Winkler model, based on the pure bending beam theory). It is found that results from the proposed TB model are, in general, in good agreement with results from the FE model, as compared with results from the PB model. The TB model is better than the PB model in considering the shear deformation of the beam. This TB model is particularly useful in modeling a reinforced beam with or without considering the reinforcement shear stiffness. The TB model has practical applications in modeling geosynthetics/fiber-glass reinforcement of foundation soils or pavement.

USE AND COST-EFFECTIVENESS OF PERMEABLE GEOSYNTHETICS ON SCOTTISH ROAD PROJECTS.

Keywords TRANSPORT RESEARCH LABORATORY, TRL, HERIOT WATT UNIVERSITY ROADS, PROJECTS, GEOSYNTHETICS, PERMEABLE, USE, COST EFFECTIVE, COSTS, EFFECTIVENESS, SOILS, DESIGN, SPECIFICATIONS, INSTALLATION, SITES, DRAINAGE, HIGHWAYS, GEOGRIDS, GEOCELLS, DATABASES, QUESTIONNAIRES, SUBGRADE, SEPARATION, APPLICATIONS, FILTRATION, WALLS, RETAINING, BRIDGES, ABUTMENTS, SLOPES, STEEP, REINFORCEMENT, PAVEMENTS, DRAINS, FIN DRAINS SCOTLAND UK... Show All

Fiber Optics for Evaluation of Pavement Reinforcement Materials in Resisting Reflection Cracking

A major maintenance problem of pavement is the reflection cracking of pavement overlays at the location of joints and cracks in the underlayers. Pavement reinforcement materials (PRM) are used to reinforce the asphalt concrete (AC) overlay to delay reflection cracking. Assessing the effectiveness of PRM in limiting reflection cracking can be achieved by direct measurement of strain distribution within the PRM and AC overlay. A fiber-optic sensor is the only alternative that is compatible with the fiberglass structure of the PRM used in this study and, therefore, is used to measure strain within the PRM. A program of investigation, developed at the Institute for Research in Construction of the National Research Council Canada, aims at studying the state of stress leading to joint opening in pavement layers and assessing the effectiveness of PRM in reducing such cracks through monitoring the performance of PRM using embedded fiber-optic strain sensors. The investigation involves both laboratory testing and long-term field monitoring of instrumented road section. The instrumentation aspect of the laboratory evaluation of PRM effectiveness using embedded fiber-optic sensors is described. An instrumentation procedure is developed that includes sensor mounting and embedding, mechanical protection, calibration, and data acquisition system. The performance of the developed monitoring system in asphalt concrete pavement specimens is assessed in controlled laboratory conditions.

Low-Temperature Stresses and Fracture Analysis of Asphalt Overlays

Thermal cracking of asphalt overlays is a leading cause of pavement deterioration. The thermoelastic response of a multilayered pavement structure is modeled using a transient thermal analysis followed by a quasi-static stress analysis at discrete time intervals using finite element analysis. Numerical analysis of two- and three-dimensional cracking problems is performed. Based on a fracture mechanics approach, the potential of thermal cracks to propagate through the overlay is examined using both a displacement formula and an energy-balance principle. The interaction between multiple cracks and the effect of bond between layers on crack propagation are examined. The proposed numerical methods for analysis of pavement thermal cracking provide a means to characterize and optimize different evolving materials and innovative pavement reinforcement techniques.

Fiber Optics for Evaluation of Pavement Reinforcement Materials in Resisting Reflection Cracking

A major maintenance problem of pavement is the reflection cracking of pavement overlays at the location of joints and cracks in the underlayers. Pavement reinforcement materials (PRM) are used to reinforce the asphalt concrete (AC) overlay to delay reflection cracking. Assessing the effectiveness of PRM in limiting reflection cracking can be achieved by direct measurement of strain distribution within the PRM and AC overlay. A fiber-optic sensor is the only alternative that is compatible with the fiberglass structure of the PRM used in this study and, therefore, is used to measure strain within the PRM. A program of investigation, developed at the Institute for Research in Construction of the National Research Council Canada, aims at studying the state of stress leading to joint opening in pavement layers and assessing the effectiveness of PRM in reducing such cracks through monitoring the performance of PRM using embedded fiber-optic strain sensors. The investigation involves both laboratory testing and ...

Low-Temperature Stresses and Fracture Analysis of Asphalt Overlays

Thermal cracking of asphalt overlays is a leading cause of pavement deterioration. The thermoelastic response of a multilayered pavement structure is modeled using a transient thermal analysis followed by a quasi-static stress analysis at discrete time intervals using finite element analysis. Numerical analysis of two- and three-dimensional cracking problems is performed. Based on a fracture mechanics approach, the potential of thermal cracks to propagate through the overlay is examined using both a displacement formula and an energy-balance principle. The interaction between multiple cracks and the effect of bond between layers on crack propagation are examined. The proposed numerical methods for analysis of pavement thermal cracking provide a means to characterize and optimize different evolving materials and innovative pavement reinforcement techniques.

合成繊維によるアスファルト道路の補強

The reinforcement effects of asphalt-pavement with various types of synthetic woven fabrics, nets, chopped fibers and beads were studied. The experimental data indicated that such properties of asphalt compound as bending strength, compressive strength, and deformation under impact load can be improved. On the basis of experimental results, polyester fabrics and nylon nets were tested on actual asphalt-pavement construction. At the actual field test, a load-spreading effect with synthetic woven fabrics and nets were found especially on the ground which can be deformed by heavy traffic load or on the soft ground. The reinforcement of asphalt pavement is, however, at the experimental stage yet and the further studies on the practical effects and economical advantages will be necessitated.

Design Considerations for Concrete Pavement Reinforcement for Crack Control

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