Resources

Since the overlay thickness must be decided considerinq the structural condition of the existing pavement, FWD was introduced to evaluate the mechanical properties and to obtain input data for the overlay design. In the case of concrete overlays for concrete pavements, the overlay thickness depends on the existing slab thickness...

Due to the planning and construction of new high speed railways, the development and testing of the ballastless tracks, which started in Germany in the seventies, is now turning up again. The use of this almost mairitenailce free structure requires the assessment of the multi-layer system. For the slab track...

Owing to its anti-kerosene properties, its resistance to heat and punching, concrete is always used in the tarmac of the runway threshold of military airports and in the aprons of large-sized aircrafts in civil airports. Due to the strong competition with flexible structures, concrete is at disadvantage as far as...

Results of a rehabilitation project for the runway nr.1 of the Otopeni Airport at Bucarest by using the Falling Weight Deflectometer (FWD). The paper describes how the deflection basin produced by the FWD can be used to characterize the pavement behaviour and to backcalculate the Young modulus (E) of the...

This paper examines the results of temperature and strain measurements obtained using strain gauges installed in the concrete pavement of the aircraft parking area of the "Marco Polo" international airport of Venice. The purpose was to control the design assumptions and models and to assess the long term behaviour of...

Airport runways and other aircraft movement areas are among today's most important infrastructure elements. The paper gives an introduction to general aspects of design and construction of concrete airport pavements, emphasizing the advantages of the two-course "wet on wet" placement technique. The above mentioned aspects are illustrated by the description...

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....

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...

The current pavement is a 8.6 km long part of the main highway North of Oslo. The concrete has a characteristic cube strength of 90MPa and the slab thickness is 170 mm. The subbase mainly consists of local natural sand and gravel. The general condition of the pavement is rather...

Rutting, depending on the wear of studded tyres, is a problem in the Skandinavian couritiis. Concrete pavements have a good wear resistance. In Ai.ustria they have recently developed a low noise concrete with small aggregate size and exposed aggregate. Earlier experiences have shown that the wear resistance of concrete is...

Various air-entraining agents were investigated for their physicochemical characteristics and for their foaming power. Correlations were found between this power and the parameters characteristic of entrained air. These parameters were determined on the fresh concrete using the DBT "Air Void Analyser". Air-entrained concretes have a water absorption very similar to...

To determine the concrete strength of a road surface the authors of this paper have used an ultrasonic method. In this method, longitudinal waves are directed to a concrete slab by means of transducers applied to the upper surface of the slab. If the propagation time and the distance between...