Experience with thin bonded cement-bound overlays in Austria

Highways Members Only

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

Highways Members Only

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,...

Erosion of concrete pavement sub-bases

Highways Members Only

A special session of the 65th annual meeting of the Transportation Research Board in Washington, in January 1986, brought together some 50 practitioners and research workers on the theme "Erosion of sub-bases; stepping of slabs and pumping of concrete pavements"; ~he presentation of 3 U.S. papers and two French ones...

Experiences with a slipform paver equipped with a dowel placing device

Highways Members Only

On the basis of experience gained on the Wildon road construction section it can be stated that slipforming is technically superior to conventional concrete placing. This applies more particularly to the better flexural strength of the top-course and bottom-course concrete in the pavement slab, the better evenness (riding quality), the...

Concrete dual-track roads

Highways, Trackslabs Members Only

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)

Highways Members Only

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

Highways Members Only

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...