Resources

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...

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...

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,...

Since 1972 between 250,000 and 300,000 m2 of acoustic screening (noise reduction) barriers have been built in France, i.e., 70 - 80 km of such structures of medium height (2 - 6 m), along the roads. They have been installed under a policy of both road and rail traffic noise...

1. Introduction Since 1962 no cement concrete had been used in the governmental road sy~tem as a paving material. After 1975 the need to use this material again was felt more and more. Somewhere about 1982, during the decision making period regardi~g the type of pavement to be chosen for...

The "Code of practice for the maintenance of concrete roads" ("Merkblatt für die Erhaltung von Betonstrassen") was published in the Federal Republic of Germany in 1985. It is based on the 1968 edition, but clearly reflects further developments in maintenance techniques, e. g., improved drainage. The code forms part of...

The long-term behaviour of various types of road pavement construction can be estimated or prognosticated from a methodical assessment of the condition of the roads and the associated data collection. Prognoses can be made not only with regard to technical cri teria, but also with regard to overall cost trends...

For the repair of concrete roads to be effective and economic it is essential to have planned maintenance procedure. Details of such a procedure are to be published in the forthcoming publication "Manual for the Maintenance and Repair of Concrete Roads" ,which is to be adopted for roads administered by...

The non-destructive evaluation of a concrete pavement must account for the temperature warping condition of the slab at the test time. In fact the thermal gradients induced in the slab by the daily temperature variations cause the temperature warping of the slab and this affects the value of the maximum...

Concrete pavements have been used to a wide extent in France on the st.rategic motorway network of the Paris area and on development trunk roads such as the Paris- Lyons. Due to the age of such road pavements, some of which are more than 25 years old, and the large...

The paper describes the survey and assessment of the structural properties of concrete pavements with the aid of in-situ and non-destructiveloading tests performed with the Dynatest 8000 falling-weight deflectometer (FWD). The following parameters for carriageway slabs with joints are considered: (I) modulus of elasticity of the concrete slabs; (2) modulus...

The resu l.cs of a research project are reported in ,which a method for the visual surveying of the condition of concreee roads was developed. In collaboration with three Federal German States, the road maintenance procedure hitherto applied was examined. The furcher investigation comprised the development of data recording sheets...