In the last years high strength concrete has been used more and more frequently for road construction in Norway. To obtain good abrasion properties and a good wurkaL,ility the quality of the coorco oggrogateE and the ovrall grain qi7 ,9 distribution is very important. By improving the abrasion properties it...
Surface Characteristics of a Recently Constructed Concrete Motorway in the UK
A full-scale trial has been constructed in the UK in which concrete surfaces with brushed, tined bnd exposed aggregate textures have been compared with traditional hot rolled asphalt. The concrete surfaces were applied to a 250 mm thick, continuously reinforced concrete pavement laid by railmounted paving equipment. The exposed aggregate...
Some Aspects of the Construction of the Azraq to Jafr Highway Project in Jordan
Hot desert environments with low humidity and strong winds provide some of the most difficult conditions in which to build good concrete roads. This paper briefly describes the materials, plant and some of the methods that were used to successfully construct the Azraq to Jafr highway in Jordan where these...
Thin Concrete Overlays on Old Flexible Pavements
Extensive rutting exists on many high volume traffic roads in Sweden. Traditional maintenance means asphalt resurfacing every second or third year. Adding a thin high strength concrete overlay would prolong the service life of the repair due to the high wear resistance of this kind of overlay. To study the...
Concrete Recycling in Belgian Road Construction – Applications in Cement Bound Road Bases and Surfacings
For some years now the interest for the environment together with economic reasons, improvements of crushing plants and the definition of acceptance criteria have led in Belgium to an increased use of crushed concrete aggregate and sand in cement bound bases. Recent official circulars and tender specifications allow for the...
New Drainage Systems for Cement Concrete Road Structures
During a research programme on geocomposite draining materials, the Belgian Road Research Centre constructed and monitored comparative drainage test sections for a concrete block-paved road. The geocomposite drain was easier and quicker to install than the conventional granular drain. Three years of continuous monitoring of weather data, drainage outflows and...
Roller Compacted Concrete as an Efficient Material for Road Pavement Construction
A study has been conducted in order to determine the influence of a wide range of factors on the properties of roller compacted concrete (RCC): coarse aggregate type and content, addition of fly ash, chemical admixtures type and quantity, technologies of manufacturing and compaction, tranportation time and concrete curing. The...
Technological Aspects of Ensuring the Frost and Salt Resistance of Concrete Pavements
The resistance of concrete pavements against frost and salt is ensured by creating the necessary volume of finely-dispersed air voids in the concrete by entraining air during the mixing process with appropriate admixtures. The influence of various structural and technological factors on the stability of entrained air and the formation...
Accelerated Wear Testing of High Strength Concrete in Norway
To give guidelines for the mix design on high performance concrete with high wear resistance, and to study wear of high strength concrete, the Norwegian cement producer NORCEM operates a test rig specially developed for this purpose. The tests show concrete to give 2-3 times the wear resistance of asphalt....
Spanish Practice and Experience with Longitudinal Finish
Since slip-form payers were introduced in Spain in 1930, more than 1.400 km of two-lane concrete pavements have been constructed with them. A proportion exceeding 90% of the total has been provided with longitudinal finishes, using different methods: burlap, plastic-bristled brushes, metal -tined combs, etc. In all cases, surfaces with...
Scope of the Activities ot the Joint Research ProgidrIlille on Concrete Roads in the Netherlands
In comparison with Germany and Belgium, the Netherlands only have a small amount of cement concrete roads. Asphalt is a Dutch tradition. However, the idea of building concrete roads is slowly coming back into favour. A broadly based Steering Group is investigating how and where cement concrete can be used...
Evaluation of Performance and Structural Design Methods of Cement Concrete Pavements in Japan
This paper examines cement concrete pavements built on japanese national highways since 1971. An investigation of pavement cracks supports the validity of the current structural design methods. The results of the analysis of the relationship between slab thickness, cracking and cumulative heavy traffic volume show that commonly used jointed reinforced...