The evenness of concrete roads is one of the main concerns of this type of pavements in Spain. In the last years many improvements have been achieved in the way of finishing concrete roads. International Roughness Index (IRI) measurements are normally done to evaluate evenness. However, the normal approach used...
Design and Construction of Concrete Road Surfaces in Germany
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...
Proposed Solutions for the Widening of Existing Asphalt Pavements on Motorways with Extra Lanes in Concrete
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...
Retreating Pavements on Site with Cement – The Test Site at Messancy (Belgium)
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...
Construction and Evaluation of Pavements with Porous Concrete Bases
Two test sections were constructed with a base course of porous concrete under the emergency lane of a motorway. This base composed of new aggregates or recycled aggregates, has the strength of a cement treated base and the function both of bearing capacity and drainage. Mixed in Plant and placed...
Effects of Classified Fly Ash on Improving the Compactability of Roller Compacted Concrete for Pavements
Roller compacted concrete (RCC) pavements are expected to be an economic and rational concrete pvPmAnt system that will become increasingly popular in Japan. The maximum thickness of a RCC slab completed in one layer is limited to 25 cm because of limitations in the compactability of the concrete and the...
Longterm Effects of Environmental Aggressiveness on Steel Fiber Reinforced Concrete For Road Construction
Steel-fiber-reinforced concrete (SFRC) has found several interesting applications in the field of road pavement and structure maintenance operations (overlays and bridge decks, prestressed beams, expansion joints). One possible drawback, however, is fiber corrosion, especially across cracks, with resulting disconnections between adjacent slabs and deterioration of reinforced concrete. The present paper...
Changes of Ultrasonic Characteristics in Concrete Road Surfaces
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...
Application of Newly Developed Prestressed Concrete Pavement Technology in Japanese Airports
Many researches on prestressed concrete (PC) pavements have been conducted. The applicability of a class Ill PC slab, in which cracking at the bottom of the slab is permitted, was confirmed for airport pavements. A new type of PC precast slab pavement with new jointing systems was developed. A new...
Skid Resistance of Exposed Aggrcgate Concrete
From 1990 to 1992 exposed aggregate concrete was used for the construction of 14 sections of Austrian motorways. This technology offers a noise reduction and a higher level of skid resistance. In order to evaluate the skid resistance of these surfaces in comparison to others, measurements were carried out in...
Project Numerical Models and Comparison with Experimental Results
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...
First Application of a Concrete Inlay on a Bitumen Paved Motorway in Belgium
The motorway A7, also called the "Motorway of Wallonia", was opened to traffic in December 1970. In the vicinity of Mons this motorway carries a very high volume of heavy traffic, which is still increasing. The right-hand (slow) lane is subject to severe rutting, which has affected the deeper layers....