The mechanical adherence properties of new concrete bound with old concrete surfaces which had been pretreated in a conventional manner as well as with new techniques, have been studied uding fracture mechanical methods. It was shown that far better adherences are achieved with specially structured old concrete surfaces than with...
Improvement of the Adherence between Old and New Concrete in Road Construction – Procedures and Testing Methods
Use of Porous Bases for the Drainage of Concrete Pavements in the USA
In the United States, many States are using free draining porous bases under new portland cement concrete pavements. These porous bases are intended to remove infiltrated surface water, which cannot be prevented from entering the pavement structure. The porous bases used in the United States have coefficients of permeability ranging...
Freeze-Thaw Damage to Concrete Pavements
Requirements for concretes in colder environments are stricter than those normally requested for standard commercial concretes. Therefore, a concrete produced with (i) high quality ingredients, (ii) a water/cement ratio of 0.35 to 0.40 by mass, (iii) 3.0 to 6.0 percent entrained air, (iv) an adequate maturity, i.e. when the compressive...
Spanish Experience with Concrete Pavements for Airports
Spain can boast of having a very large concrete pavement area, amounting to more than 90 percent in over 35 civil airfields and 5 military air bases. Technical details, construction methods and performance of these pavements are analysed, together with their evolution in the latest projects which have started in...
New Opinions in the Friction Problematic with Brushed Textures and Exposed Aggregates
Washed or fine brushed concrete was introduced in the Netherlands, replacing rough brushed concrete, to reduce the road noice. In many cases the minimum friction coefficient required was not reached. However, measurements carried out some months later showed an improvement of the results. To investigate if this improvement of the...
6th International Symposium on Concrete Roads 1990 Madrid Spain
Closing Addresses from the 6th International Symposium on Concrete Roads 1990 Madrid Spain
6th International Symposium on Concrete Roads 1990 Madrid Spain
Session Paper Indexes, Opening Addresses, General Reports, Oral Contributions and Closings from the 6th International Symposium on Concrete Roads 1990 Madrid Spain
6th International Symposium on Concrete Roads 1990 Madrid Spain
Index of Proceedings from the 6th International Symposium on Concrete Roads 1990 Madrid Spain
The Design and Maintenance of Contraction Joints Behaviour of the Namur Test Road After 10 Years of Traffic
This article describes the behaviour after 10 years of service of the test sections constructed in 1979 on State road N 4 in the Belgian province of Namur, The object of this experiment, is to compare various types of contraction joint on the same site and under the same conditions...
Ways of Reducing Tire-Noise on Concrete Pavements Experience and Tests in Austria
Tire-road noise can be reduced considerably by providing a suitable surface geometry. According to the new Austrian specifications pa-vers must be fitted with a longitudinal smootherto eliminate any transverse waves produced by thebeams of the paver. In order to obtain a noise-reducing surface a longitudinal texture (e.g.. a burlap drag)...
Design Charts For Small Element Precast Concrete Slab Pavements Using a Combined Finite Element Westergaard Approach
Small element precast concrete slab pavements through their use in urban areas where vehicular over-run is predominant have suffered severe failures which incurred a substantial public expenditure for their maintenance in the UK. This has created a need for the development of a rational design method that would lead to...
The Use of 130 MPa Concrete in the Rehabilitation of an Old Pavement
lIn Norway, most every car is equipped with tires having small steel studs to improve the friction between the tire and road during the winter season. These studded tires have an enormous wearing effect on ordinary asphalt pavement.