Design

To improve the surface quality or the water drainage and the service life of a mediocre damaged concrete pavement, this pavement can be overlaid with a 4 to 6 cm thick asphalt layer. The status of the concrete pavement and of the joints with respect to potential reflection cracks needs...

Waste disposal is a serious problem for local authorities and the search for alternative solutions which allow for reusing is necessary. rin public works on roads or sewer systems,new techniques, new types of materials and new approaches are coming to the front, including the consideration of "environmental costs" besides technical...

This paper examines the influence of the different factors that affect the problem of the collisions against the concrete safety barriers used to delimit the area of approach to narrower carriageways. In particular we have studied the influence on the damage of the vehicle and the shear strength necessary in...

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...

This paper concerns a joint research programme being undertaken by the Roads and Traffic Authority of New South Wales (Australia) and the Cement and Concrete Association of Australia. The objective of the research is to develop quieter concrete road surfaces, whilst maintaining acceptable skid resistance, by modifying the surface texture...

Increasing traffic loads and new environmental criteria have led to more stringent requirements for the surfacing of roads. At the same time, practical experience and new methods have improved the construction of concrete road surfaces. In the light of these developments, it was also necessary to adapt the German technical...

Many areas in western Europe suffer trom congestion of traffic during peak hours, mainly on motorways leading to and situated near the economic centres. Therefore, authorities plan to widen several motorways in order to improve the mobility. In the Netherlands the widening of approximately 400 km motorways is expected to...

In the field of research on secondary materials, an experimental study on the re-use of building demolition waste has been conducted. These materials will be used in Italy, further to decree-laws and regulations, drawn in compliance with the rules of the Community Law 1 9 w93h, ich has already been...

Conventional concrete safety barriers of the New Jersey type are frequently used in Belgium. At the end of 1993 more than 1600 km had been placed. Slightly higher precast safety barriers connected by a Swedish system have been successfully used especially to separate the traffic during reconstruction works of a...

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....

For the time being the exposed aggregate technique is the cheapest way of building a rigid pavement with a surface that is noise reducing, skid resistant and durable. The technique requires the use of specially adapted payers, very good-natured retarders and a very efficient curing. Special combinations of surface retarders...

The present paper illustrates the experience of ITALCEMENTI S.p.A. and C.T.G. S.p.A. (former ITALCEMENTI INGEGNERIA S.p.A.) in designing CRCPs. During 1991-1 992 a slip road was built between the MONSELICE cement plant (Padua) and the state road "S.S. 10 Padana Inferiore" in order to divert heavy vehicle traffic driving to...