Highways

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,...

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...

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...

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...

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...

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...

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...

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...

Many minor roads are constructed with a cement-bound sub-base not provided with a surfacing. Two such experimental se~tions of road are described in this paper. One of these sections comprises a cement-bound crushed stone sub-base (shell limestone 0 - 45 mm size). It was constructed with a binder content of...

Seven experimental sections of thin overlay construction on old concrete and asphalt road pavements have been built in Belgium since 1982. These comprise a total area of 107 000 m2 of fibre reinforced concrete (five sections) of la cm and 12 cm thickness and 34000 m2 of continuously reinforced concrete...

Roads now ofcen have to be provided wich noise control scructures, those most commonly employed being earthbanks, steep-faced banks, acoustic screens and noise reduccion barriers. Large installations and special structures for noise control purposes are more rarely encountered. "Steep-faced banks", which occupy less space than earth-banks, consist of a supporting...

This paper will provide specific recommenda~ions for the improvemen~ of jointed concre~e pavement design practice. Tbe recommendations will be based upon findings from a major nationwide research project recen~ly completed in the USA concerning field observations of pavement performance. A concre~e pavement performance database was established and extensive data collected...