In Portugal, fly ash is often used as a cement replacement material on concrete for road pavements. The percentages of replacement generally range from about 30% in the top pavement layer up to 50% in the bottom layer. A study was carried out for evaluating to what extent such amounts...
Performance of the Ecopave System After Five Years Trafficking
ECOPAVE is a system of laying concrete through a modified bituminous paver, inducing transverse cracks into the concrete, and overlaying with a thin bituminous surfacing. The system has been developed through a BRITE project with partners in the UK and Denmark. It is coiisideied to provide economic benefits over the...
Concrete Pavements for Heavy Traffic Areas
The space available on our roads is becoming less and less. All forecasts agree that the increase in traffic will also cotiliiiue to grow considerably in the years before us. At the same time, because of the changes in political conditions in Europe and the opening of the frontiers, there...
Development of Cement Treated Asphalt Mixtures for Pavement Rehabilitation
Cement treated asphalt mixtures (CTAM), which are composed of an asphalt mixture and cement milk injected into voids of the asphalt mixture, were studied for use as a fast overlay material for airport pavements. The cement milk must have adequate fluidity for about 30 minutes and must develop a flexural...
Reconstruction and Recycling of Concrete Pavements
After 30 to 35 years heavy traffic loading concrete motorways have to be reconstructed. In Germany, the old concrete pavement was ]ft in its place and overlaid with a new pavement. This reconstruction method may be really economical under definite circumstances but is hardly practicable for the contemporary reconstructions, especially...
Reconstruction of Concrete Roads Using Recycled Sand as Aggregate
In the domain of road building, recycled aggregate made from old concrete road pavings has been used in the construction of new concrete pavings for quite some time. Generally only the coarse fractions of more than 4 or 2 mm, respectively, are used as recycled material. Most of the recycled...
The Behavior of Concrete Block Pavements
In 1981 to 1985 and 1993/94 static and dynamic tests on block pavements were carried out on a 1:1 scale at the professorship of Road Construction at the Technical University of Dresden. The pavements were loaded with a plate bearing test equipment (approx. 0.7 N/mm 2) with a static stress...
Fatigue Properties of Plain Concrete
Based on a literature search, several types of fatigue relationships were collected, compared and analysed for plain concrete (specimens, pavements) subjected to repeated loading. A uniform fatigue relation - based on the FS- R concept - has been proposed for the flexural tensile strength. The 50%-probability curves have been analytically...
Fibrous Ferrocement – An Ideal Material for Bridge Overlays
The overlays of highway bridges are usually subjected to stresses like impact stresses, longitudinal stresses, due to the application of brakes and wear and tear stresses. The moving loads on bridges have a jumping action due to uneven surface on which they move. This jumping causes shocks and vibrations of...
Air-Entraining Agents in Road Concrete Code of Good Practice and Field Experiments
Air-entraining agents are increasingly recommended as a mean to counteract the ever more severe deterioration of road cement concretes in winter. However, their use is still raising problems as far as the specifications and the practical implementation of the technology are concerned. The results of research conducted by BRRC and...
The Study of Mean Time Drying Shrinkage Behavior of Steel Fiber Reinforced Concrete Pavements
Concrete structures shrink when they are subjected to a drying environment. If this shrinkage is restrained, then tensile stress develop and concrete may crack. This shrinkage is a major concern for concrete structures especially for wall, slab and pavements. One of the methods to reduce the adverse effects of shrinkage...
Fiber-Reinforced Roller-Compacted Cement Concrete (Rollfiber) for Continuous Concrete Pavements
The ROLLFIBER process consists of roller-compacted cement concrete reinforced with steel fibers. It enables you to build continuous pavements without any joints. To reach this level of performance, the fiber has to have what is known as total' anchorage, and its action is optimized by the use of a concrete...