In recent years several investigations were carried out in Germany aimed at reducing the tyre-road noise on concrete block pavements. The results show that these pavements can be constructed with a surface producing the same low traffic noise level as the reference asphalt road surface. In the paper, conclusions are...
Materials Mix Design and Quality Control
A system for assessing the materials used for the construction of a concrete road is presented. The materials constituting the three layers of the pavement -ely stabilised granular mix, cement-bound mix, concrete and porous concrete for the road shoulders- were accurately selected and subjected to thorough controls during construction. The...
Evaluation of Concrete Pavements on the Restauration with Thin Aspahit Layers
To improve the surface quality or the water drainage and the service life of a mediocre damaged concrete pavement, this pavement can be overlaid with a 4 to 6 cm thick asphalt layer. The status of the concrete pavement and of the joints with respect to potential reflection cracks needs...
Development of a Test to Compare Anti-Reflective Cracking Treatments
In Spain, like in other European countries, during the last twenty years roads constructed with cement bound base layers have had many maintenance problems due to reflective cracking. It is impossible to know the effectiveness of the new treatments which are applied as anti-reflective cracking measures. Therefore a laboratory test...
Reconstruction of a Section of the A9 Motorway Using Recycled Aggregate Concrete
In Germany the use of concrete with aggregates obtained from crushed concrete (RC aggregate) has been quite limited in comparison to other countries such as the USA and Austria. This situation is caused mainly by the lack of appropriate regulations for this kind of application. For this reason, the award...
Slip Formed MaIa Slotted Gutter
"MAIA" is a slotted driveable gutter used for the drainage of motorways and airports. T.S.S. adapted the SATUJO slotted gutter method to be realized on a slipform paver. The new concept is based on the insertion of an air inflated reusable flexible tube on a slipform paver which enables the...
Continuously Reinforced Concrete Road Bases
In the Netherlands Rijkswaterstaat is the authority in charge among others of the construction of highways. The department Limburg of Rijkswaterstaat has chosen a continuously reinforced concrete roadbase for the construction of the 12 km long new highway section between the cities of Venray and Boxmeer. This choice was based...
Curing of Concrete Pavements to Control Thermal Stresses
The main goal of curing is to protect the young concrete against drying out. These investigations indicate, that concrete temperatures during the first day of hardening are decisive for the magnitude of thermal stresses of the hardened concrete and the related cracking risk. High thermal tensile stresses occur, if the...
The Construction of Underground Concrete Roadways at Finsch Diamond Mine (South Africa)
In this paper the different types of underground roadways, the development of the design of in situ concrete paving and the problems of designing for these special conditions are discussed. These include the use of moisture sensitive subgrade/subbase, very irregular founding conditions, varying and even dynamic loading due to blast...
Measurement and lrnpruveiiieiit of Road Evenness on Concrete Roads
The evenness of concrete roads is one of the main concerns of this type of pavements in Spain. In the last years many improvements have been achieved in the way of finishing concrete roads. International Roughness Index (IRI) measurements are normally done to evaluate evenness. However, the normal approach used...
Design and Construction of Concrete Road Surfaces in Germany
Increasing traffic loads and new environmental criteria have led to more stringent requirements for the surfacing of roads. At the same time, practical experience and new methods have improved the construction of concrete road surfaces. In the light of these developments, it was also necessary to adapt the German technical...
Proposed Solutions for the Widening of Existing Asphalt Pavements on Motorways with Extra Lanes in Concrete
Many areas in western Europe suffer trom congestion of traffic during peak hours, mainly on motorways leading to and situated near the economic centres. Therefore, authorities plan to widen several motorways in order to improve the mobility. In the Netherlands the widening of approximately 400 km motorways is expected to...