This paper reports the experience gained by the Highways Department in Belgium in the construction of so-called New Jersey safety barriers during the past few years. First the reasons why the Ministry of Public Works gave up the more traditional protection systems such as steel or aluminium safety fences are...
Design of concrete pavements
Together with the increasing demand for concrete pavements in the Netherlands, the need for a technically and economically justified method of pavement design arose. On the basis of the present knowledge on the stress and deformation behaviour of concrete under static and repeated loading, a method of concrete pavemen~ design...
Construction procedures of relevance to the type of work to be carried out
The construction of concrete pavements is associated with various requirements to be fulfilled, e.g.: full-width construction stripwise construction, but extending over the full width ) e.g., construction of new cancrete roads addition of traffic lanes to existing carriageways ) e.g., on roads in use by traffic renewal of traffic lanes...
Realization of agricultural roads in concrete in Belgium
The construction of concrete agricultural roads continues to increase in Belgium; latest statistical data show that public autorities still rely on this type of pavement. A new design method was recently proposed and published by the Ministry for the Walloon Area; it is based on simple concepts and its application...
Determination of slab rocking at the joints of a cement concrete pavement
The amplitude of the deflection at the ends of the slabs at the transverse joints under the passage of a heavy load is an impo.tant c.iterion for assessing the effecciveness of the load transfe. at the joints and for the degree of deterioration of the carriageway. The technique applied at...
Construction of concrete noise protection barriers
The finalizing of the Federal German-law relating to pollution and nuisance control (Bundesimmissionsschutzgesetz) in April 1974 was an important step in the implementation of active noise control measures. The "Guidelines for traffic noise control on Federal interregional highways" published by the Federal German Minister of Transport in August 1983 establishes...
Development of the technological concept for roadbases made of hydraulic bound granular materials in the Federal Republic of Germany
A number of research projects relating to the cementbound sub-base (CBSB) are currently in progress in the Federal Republic of Germany. Their object is to develop an optimized technological approach with a view to further improvement and even greater economy in the use of this well proven form of construction....
Strengthening with concrete on the Nationale 6 in the Yonne County
For the "Nationale 6" thickening between Auxerre and Cravant, the concrete pavement solution, in competition with traditional techniques, is particularly interesting on the economic point of view and held the Head District Equipment attention in agreement with the French Road Management. The strenghening technique consisted in implementing by 4 m...
Joint design for concrete pavement on cement stabilized base at Zürich airport
On the concrete pavements of the runways 14 - 32 and 16 - 34, built in 1975 and 1976, cracks developed along the tongue-and-groove longitudinal joints. Investigations into the service conditions of the joints showed that they were overstressed unde r extreme loads and that damage to them could be...
Non-destructive testing of motorway concrete pavements
The standard of serviceability of road pavements can be expressed in terms of safety for the user (skidding res is tance, riding quali ty). For highway managers a standard of structural serviceability is essential for optimizing the initial constructional expenditure and for predicting ~he time schedule for maintenance, strengthening or...
State of the art of concrete safety barriers
In 1976 the ~ew Jerey concrete safety barrier and the experience gained internationally with it was for the first time brought to the attention of interested persons in highway authorities, research and industry in the Federal Republic of Germany. Four years later, the first pilot projects were implemeneed in this...
Experiences with sand-cement stabilization in road construction
At Hamburg, sand-cement stabilization (SCS) conseructed by the central-mixed (stationary plant) method is successfully used for frose-protection courses. The requirements applicable to these courses, which as a rule are 15 em thick, are based on those for cementbound sub-bases as laid down in the TVT regulations: degree of compaction ~98%,...