Conf. Paper (EUPAVE)

The demand to use recycled aggregates in concrete is getting more important. However, to obtain a sustainable road, it is necessary to construct durable pavements and therefore to use concrete of good and reliable quality. The use of recycled aggregates will give environmental advantages but could lead to excessive shrinkage...

Continuously Reinforced Concrete Pavements (CRCP) are designed in such a way that the longitudinal reinforcement limits the widths of the transverse cracks in the pavement in order to prevent the water, chemicals and deicing salts from penetrating into the pavement. Self-Consolidating Concrete (SCC) is a new and innovative concrete type,...

Since 2003, roundabouts in Switzerland have been built with concrete carriageways. Because space is at a premium due to the population density, the diameter of most roundabouts is less than 30 m. Roundabout carriageways with small diameters are subject to particularly high shear stress levels, which is why the choice...

Longitudinal joints in concrete pavements historically have been located along the edges of lane lines, a condition that results in applied loads being located at the most critical points (e.g., edges and corners of slabs). With increasing use of light?colored silicone sealants that contrast less with the concrete surface color,...

A frequently noted disadvantage of cement concrete pavements is repair time. For further application of this technology, it was necessary to eliminate this disadvantage and significantly reduce repair time. Therefore, Skanska developed the "Fast-setting concrete technology". In-house development commenced in 2005. MC Bauchemie, design engineers and investor representatives also participated....

The Federal Aviation Administration’s (FAA) National Airport Pavement Test Facility (NAPTF) conducts accelerated full-scale testing of airport pavements under controlled conditions. Construction Cycle 6 (CC6) was aimed at evaluating the effects of concrete strength and subbase materials. Two types of isolation joints were also tested for comparison. Data from embedded...

The Sevilla – Cádiz motorway was the first one in Spain where a concrete pavement was constructed with a slip-form paver. It was opened to traffic in 1971. Shortly, longitudinal cracks appeared, deemed to the presence of plastic soils in the subgrade. Sometimes these craks were several centimetres wide. It...

Concrete pavements are recycled for paving applications in at least 41 U.S. states and production of recycled concrete aggregate (RCA) in the U.S. currently averages about 140 million tons (127 million metric tons) per year. The primary application of RCA has been subbase materials, but it also has been used...

At present the choice of materials and techniques in road construction is dictated by structural requirements and economical aspects. Ecological factors have gained in importance due to environmental considerations in politics and society. To evaluate the environmental impact of motorways, a life cycle assessment (LCA) according to ISO 14040 was...

During the 1999 spring, two sections of ultra-thin whitetopping (UTW) were built in an urban street at a bus stop within the University of São Paulo campus, over a thin 45 mm asphalt layer. The UTW was constructed, defining two square panels of 0.6 and 1.0 m in size and...

Precast pavement technology is a recently improved construction method that can be used to meet the need for rapid pavement repair and construction. Precast pavement systems are fabricated or assembled off-site, transported to the project site, and installed on a prepared foundation (existing pavement or re-graded foundation). The system components...

Usually pavements for heavy load service are constructed with double reinforced concrete. Mostly their thickness is about 40 cm and – beside the high costs – there are structural problems with the placing and the design of joints, if unwanted cracks and steel corrosion should be avoided. In addi-tion to...