The General Highway Plan (1984-1991) currently under execution has prompted an overall update of the specifications, in order to take into account the past experience, the new materials and the traffic evolution since 1975. In general, internally vibrated portland cement concrete pavements (PCCP) for heavy traffic have transverse joints every...
The New Spanish Standard on Pavement Design
Measurements of Noise Caused by Tyre Friction on Different Test Roads
This report isabout various tests concerning noise caused by tyre-friction on various surface textu-res: on old and new concrete roads as well as ona rough, uneven surface.In this connection the influence of the various sur-face textures on the development of the noisecaused by tyre-friction is explained.Through these tests it could...
A Project of Concrete Cycle Tracks in the Region of Hasselt
In spite of numerous cyclists (3.5 millions), until the seventies, the emphasis was in particular on the construction of motor roads and motorways. The cyclist was fairly vulnerable in this environment. From the eighties onward, a new vision appeared in the Flemish region: in and around conurbations, cycle track plans...
Time-Dependent Behaviour of Roller Compacted Concrete Pavements
Roller compacted concrete pavements (RCCP) have been increasingly constructed in many places in Japan. However, the behaviour of RCCP in the areas of joints and cracked sections has not been completely cleared. In order to establish a rational thickness design of RCCP and to study long-term behaviour of RCCP and...
Moisture Effects on the Bahaviour of PCC Pavements
Results of immersion-drying laboratory lest on pavement con-crete pieces show that tbe deformations produced by internalmoisture variations are as important as those produced bytemperature changes. Indirect measurements of internal mois-ture in actual pavements demonstrate the predominant existenceof a moisture differential between the slab surface and bottom.The resulting upward warping in...
Optimization of Surface Characteristics of Cement Concrete Roads
The surface properties of a road pavement must fulfill a long list of requirements. Recently this list has been extended to include acoustic properties. Roughness is characterized by micro-, macro- and megatexture. The results of measurement of skid resistance and road-tire noise are discussed. Possibilities for further optimization of the...
Nature Related Constructions in Rural Districts Wheel-Track Paving with Concrete
In the sixties and seventies it used to be the traditional way to build paved country roads in full width in rural road construction. Economical consciousness, agricultural production zones -in the context of developing better economical systems-forced us to change our views. A very natural path is a wheel-track path...
Behaviour of Rolled Compacted Concrete Results of Measurements in Experimental Pavements
Precise measurements on experimental ruil scale pavements demonstrate that curling and warping phenomena arc affecting similarly the RCC and the conventional PCC pavements of equivalent designs: with «light differences in deflections and joint openings mainly attributed to different adherence at the slab-base interface. After IS months exposed to drying shrinkage....
The Influence of Dowel Deviation on Concrete Paving Slabs
A series of tests have been carried out to figure out the in-fluence of deviation of the dowels on concrete paving slabdowels with respect to slab movements through shrinking andthermal variations.The stresses produced in the slabs for various deviations withrespect to the theoretical position and according to the systemchosen to...
Study of Long-Lasting Materials and Conventional Paints on Concrete Surfaces
Due to the increase of concrete use in road cons-truction, the report examines the influential fac-tors on the three most important properties in roadmarking, above all on concrete pavements.The analysed properties are:- Night visibility.- Day time visibility.- Skid resistance.The study makes a comparison of two systems:two components system (plastic of...
The Use of Steel Fibre Reinforced Concrete in Heavy Duty Port Pavements
Recent years have witnessed a considerable growth in importance of heavy duty pavements, mainly because of several major pavement failures in ports leading to serious problems. A recent development took place in the concrete technology and has considerably increased the cost effectiveness and performance of concrete heavy duty pavements making...
Experimental Study of the Strain Modulus of Compacted Concrete
In this paper the results of several experimental studies carried out in order to determine some properties of RCC are described. These properties are important to design and to control RCC pavements: - comparison between strain modulus of different RCC and vibrated concrete mixes whose mechanical strength were similar; proposal...