Farm roads in interdependence with higher-ranking roads form int~grated traffic networks for the benefit of the rural and urban population. With -tbe many and vari~d duties that such roads perform they func tian more particularly as aids to agricultural and forestry development projects, with effects extending even into the ecological...
Experience with thin bonded cement-bound overlays in Austria
In Austria bonded overlays only 35 mm thick are made using a superplasticized concrete with a wie - ratio of 0.35 . The overlay has to be moist-cured. For thicknesses of only 20 mm a special latex addition is used. For good bond the concrete is brushed vigorously with a...
Concrete safety barriers: conditions of utilisation
The theme of safety for the vehicles on the road is very important and involves problems of several kinds. A system to limit the damages produced by the road accidents consists in placing at the edges of the road fixed and continuous obstacles which are called "safety barriers". In Italy,...
Commnon loadbearing effect of concrete pavement and cementbound sub-base
The combined load bearing action of the concrete pavement and the cement-bound sub-base (CRSB) has a favourable effect on the long-cerm behaviour of che road structure in the case of unreinforced concrete road slab construction wichout expansion joints. as has proved effective in Germany: - Because of che roughness of...
Continuous quality control of high performance concretes for road – within the framework of site supervision – using a new field tested BASIC-MC programme
Introduction and statement 'of problems: This paper closes the gap in concrete highway engineering technology by evaluating complex compactionphenomena and by deriving mathematical relationships between the concrete-technological, dynamic (thixotropic- plasticized) and physical parameters. It is based on the latest experience, e.g., including the construction of the concrete pavements of the...
Concrete dual-track roads
Fully paved farm tracks which look like roads are coming in for a~ increasing amount of public eriticism, for they do not fit the ima~e of originally unpaved tracks consisting of two parallel wheel paths with a grassed strip in the middle. Trackways built of concrete do resemble the old...
Concrete overlay on the regional major road Eersel-Belgium frontier (SI7)
Since 1984 the county of ~oord-Brabant in the. ~etherlands is working out a programme ofconcrete cve r Lay i ng of old concrete pavements. These old pavements were mostly constructed in the 1960's. These roads, constructed on a sandbed,are unab Le to wi ths tand the increased weight and intens...
Cement concrete safety barriers
Since 1974 some 1000 km of concrete safecy barriers of the New Jersey Cali£ornian type have been built in France, where these structures are known by the designations D.B.A., G.B.A. and L.B.A. These barriers, whether installed on the central reserve or along the outer edges of roads and motorways. are...