Pavement type selection is often one of the more challenging and controversial decisions highway administrators face. The process involves weighing engineering factors such as materials, structural, and even long term performance against initial and life-cycle costs to help agencies decide between various pavement alternatives. Given the expenditure of significant public...
Early and Late Age Shrinkage of Concrete in Industrial Floors Design
For proper joint design, slabs size and slab thickness of concrete industrial floors, as well as other structures, it is necessary not only to know the final shrinkage of the concrete, but also the evolution over time for both long term and early shrinkage, and the relationship between these properties...
The Influence of Sand Grading on the Air Void System
In this research the influence of sand grading on the air void system in mortar is determined. Three sand grading types are defined: sand low, sand mean and sand high. The difference is the amount of fines, < 250 ?m, (low, mean and high amount of fines) in the sand....
Guidelines for Bus Stops in Concrete in the Netherlands
New legislation for improving accessibility to buses by people and especially disabled people led to the modification of bus platforms and particularly the kerbs at these platforms. Buses should be able to approach quite close to these platforms. This depends on the design of the bus stop area. The dimensions...
Determination of the Behavior of on Site Pavement Recycling with Cement
On site pavement recycling with cement is the most sustainable restoration technique, by means of which a degraded pavement is transformed into a consistent and more homogeneous structure, using the road as a source of aggregates. Both bearing capacity and homogeneity are therefore considerably improved. Due to the absence of...
Comparison of Roadway Jointed Plain Concrete Pavement Thickness Design Methods Common in the United States
While much research in the United States (U.S.) has focused on the development, enhancement, and sensitivity of the AASHTOWare Pavement ME Design (previously known and MEPDG and DARWin-ME) method, little work has focused on comparing the results from this design method to other design methods already regularly used in practice....
Improvements to the Construction Process for Semi-Rigid Pavement Rehabilitation on Mexican Highways
The Mexican Federal Government has allocated a great deal of investment to the maintenance of pavements across the existing road network (in 2010 and 2011, this investment amounted to 7,860M and 7,894M respectively). During the 1990s, a pavement system was introduced in Mexico involving the incorporation of Portland cement using...
New Developments of Porous Concrete and First Experiences in Germany
Porous surfaces of cement concrete (OPB) or asphalt concrete (OPA) have a permanent transfer of rainwater and additionally noise reduction potential compared to the dense microstructure with exposed aggregates concrete. Pervious concrete test sections in the field of heavy-duty highways previously reported, however, do not have sufficient durability. Causes of...
Photocatalytic Air Purifying Pavements in Belgium Where are We
The construction and rehabilitation of roads are more and more linked to the environmental impact of this road. Durability, noise and air quality become more and more important as design criteria. The choice of materials can influence the environmental impact of traffic and road infrastructure. In this respect, photocatalytic concrete...
Influence of Recycled Concrete Aggregates on Strength Properties of Concrete
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...
Restrained Shrinkage Cracking of Continuously Reinforced Self-Consolidating Concrete Roads
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,...
Building Concrete Roundabouts in Switzerland
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...