Requirements for the Application of Surface-Retarders in Whisper-Concrete Road-Projects

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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

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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

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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

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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

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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

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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

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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

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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...

Joint Load Transfer Testing

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The paper describes and evaluates plate hearing tests performed on airfield CC slabs, in order to ascertain the interaction of slabs across transverse and longitudinal joints and the joint load transfer. The applied characteristics of mad transfer I .T and T ,TF, varied, however. the great significance of temperature and...

A New Approach in Concrete Highway Construction

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After a long period of experience in concrete road coad construction a new type of pavement is under supervision. Reasons to develop a new type are some disadvantarous experiences with concrete slabs resting on supporting layer of hydraulically bounded material and the need to reuse old pavement materials. The new...

Pre-Evaluation of Hydro-Demolished Concrete Surfaces by Dulled Core Testing

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The paper contains investigations of concrete debris generated during the compression testing of drilled cores and during hydrodemolition, l3ased on sieve analyses, average diameters of the debris samples are estimated. It is found that a fairly linear relation exists between the average size of the debris generated during the compressive...

A Study on the Thin Precast Concrete Pavement for Rehabilitation of Asphalt Pavements

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Precast concrete pavcmrnts have the merit to supply concrete slabs of good quality. In the concstructiori of precast concrete pavements, it is not necessary to use any special machines. And the special merit is that traffics can open immediatly because of unnecessary of curing. So this type of concrete pavement...