The present paper aims to contribute to the study of the structural response of concrete slabs jointed by dowel bars in pavements. As is known, a common construction technique of pavements is this one that uses concrete slabs interconnected each other in both directions by equidistant dowel steel bars. A...
Hydraulic Concrete Roadways on the Autopista Del Mediterraneo Appraisal and Management
This paper addresses the appraisal and management procedure used for more than 20 years by a toll motorway concessionaire, covering a total of 300 kilometres of concrete dual carriageway built between 1970 and 1985. The system of analysis, surveys and experiments carried out during this period was based on auscultations...
The Importance of Continuous Slab Support and Load Transfer at Joints in the Performance of Thin Concrete Overlays
Studies on the structural performance of existing Portland cement concrete roads in South Africa (1) have shown that the traffic utilizing these roads is not the pnme initiator of structural failures. Factors such as construction, environment and slab support conditions are predominant in initiating structural failures. However, it is also...
Jointed Concrete Pavement Structural Evaluation Overlays Design
In connection with a rehabilitation project, the long-term performances of 15km existing old jointed pavement were comprehensively surveyed. The collected data included visual conditions, roughness measurements, core tests, and FWD defleLtions. By analyzing the FWD measurements, the in situ struchiral moduli were backcalculated, and then, the fatigue damage of existing...
Requirements for the Application of Surface-Retarders in Whisper-Concrete Road-Projects
Although the quality of the surface-deactivator is very important, the surface-deactivator will only react to the quality of the concrete onto which the surfcedeactivator is applied to. Therefore the surfacedeactivator will not be able to compensate for segregations, unsuitable concrete mix-designs or mistakes in application, etc. It is always recommended...
High-Quality Concrete with Recycled Aggregates
New laboratory and field investigations showed that it is possible to achieve durable concrete by using recycled aggregate above 4 mm from old pavements with cracks but no frost- or concrete structure deterioration. The concrete compressive and tensile strengths were slightly higher and the cracking sensitivity was slightly lower for...
The Development of Concrete Block Paving for Roads and Other Areas, and Methods of Design and Construction
This paper shown a variety of methods available for the design of concrete pavements. Each method of design has benefits and disadvantages but none of the design methods actually model paver pavement accurately when subjected to rolling loads. It is important to consider the bedding sand specification and how it...
Experimental and Numerical Study of Behaviour of Concrete Pavements
The numerical methods are a fundamental tool in the analysis of concrete pavements. However, the numerical methods need experimental data in order to calibrate the model parameters. This means that only the use of both techniques, experimental and numerical, allows an efficient simulation of the behaviour of pavements. Therefore, a...
Dynamics of the Roads Evaluation of the Forces Transmitted from a Vehicle to the Road Under Different Loading Conditions
A simplified viscose elastic model is proposed which is able to simulate the dynamic interactions between a vehicle and the rigid pavement under different loading conditions (constant and linearly variable in time). The deformations are correlated to the length of the mobile loads and to the characteristics of the vehicle....
Adjusting the Moisture Content of Mature Concrete for Durability Control
The presence of a specified volume of definite-dispersity air voids in the structure of cement concrete does not quarantee the scaling-resistanceIr concrete pavements under the action of frost and deicing agents. Experiments show that partial drying of mature concrete before its saturation increases the concrete scaling-resistance, while conipleLe dLyirlg up,...
An Applied Research Programme on Continuous Reinforced Concrete Pavements
Continuous reinforced concrete (CRC) pavements built in France since this technique was first used in 1983 have pratically all been designed in the same way as pavements consisting of dowelled slabs. Owing to the circular form of the test tracks at fatigue facility of the Laboratoire Central des Ponts et...
Surface Drainage Techniques – Using Slipform and Extruded Concrete Machines
The adaptability of the process to most projects through prior design, the quality of constructions throughout the world and the complete satisfaction of users definitely allows us to conclude that these slipform techniques have reached a level of reliability and performance most appreciated by all clients and engineers, and that...