Design

A cost comparison between different pavement types is based on the current value of the construction and maintenance costs and the annual costs of the road during its service life. A detailed technical-economic comparison between asphalt and concrete pavements should always be made when the ADT of the road >...

As precast prestressed concrete pavement slabs with high strength are resistant to abrasion and enable fast construction, they have been increasingly used in Japan instead of the conventional pavements, especially in heavy traffic roads and airfields. 1-lowever, in precast prestressed concrete slab pavements with plenty of dowelled joints, pumping and...

The control of disturbances (noise, flooding, runoff water pollution, etc.) nowadays constitutes a major preoccupation of local populations. The roadway, in the diversity of the functions it performs in the urban and pen-urban scctor, can contnibutc activcly to the control of such disturbances. Porous pavements constitute a valuable area of...

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...

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...

The design of jointed concrete pavement (JCP) using mechanistic-empirical concepts must incorporate a systems approach in considering material and traffic variability with respect to design and calibration in a mathematically consistent manner. Calibration procedures are necessary to insure the prerequisite accuracy in the design calculation and estImate of pavernelil. peIIuIIIIdlIlx....

This paper considers the role of whole life costing in the management process for the road network and explores the background to current interest in England. It describes the development of the computer model, COMPARE, for assessing the whole life costs of bituminous and concrete pavement options. The key components...

Fast track paving has been a daily routine in Vienna since the early 80ies. To meet the requirements for opening to traffic (flexural strength at least 3.85 N/mm 2 ) quickly, super-plasticized concrete with a w/c-ratio below 0.42 is used and opened to traffic the second day after placing. If...

Urban roadways represent considerable stakes from both the quantitative and qualitative standpoints, with the almost permanent concern today for integration with respect to the site and to users of public spaces. A non-exhaustive review of the trends in practices and tools available to designers, builders and managers of urban roadways...

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...

Noise protection has been a main concern in Germany for a long time. The contribution of the road surface to the reduction of traffic noise is recorded with correction values and taken into consideration in noise protection calculations which are legally significant in the planning and construction of roads. These...

Closing Addresses from the 6th International Symposium on Concrete Roads 1990 Madrid Spain