The Influence of Sand Grading on the Air Void System

Highways Members Only

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

Highways Members Only

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

Highways Members Only

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

Highways Members Only

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

Highways Members Only

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

Highways Members Only

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...

Continuously Reinforced Concrete Pavement in the A-7 Mediterranean Motorway of Spain

Members Only

Long-life concrete pavements require less frequent repair, rehabilitation, and reconstruction, and therefore contribute to improving highway safety and mitigating congestion. Experience with these pavements, including examples of concrete pavements that have remained in service for more than 35 years. CRCP set out to offer the market a new alternative in...

Exposed Aggregate Concrete Pavement Design Construction and Functional Performance-A Comparison of European and US Experiences

Members Only

In 2006, a group of highway agency and paving industry representatives from the USA visited Europe in search of current practices for the design, construction, maintenance, and rehabilitation of concrete pavements. In every country visited, examples of exposed aggregate concrete were demonstrated. While not a new discovery, the discussions did...

The Construction of the Rosario – Cordoba Highway An Emblematic Project of the Road Activity in Argentina

Members Only

Due to the magnitude of the project, its characteristics, and the economic and cultural development of the region where it settles, the construction of the Rosario – Cordoba Highway represents an emblematic project of the road activity in Argentina. A singularity of this motorway is that it has been built...

Slab Jacking – Development of New Materials

Members Only

In order to extend the lifetime of concrete roads for many years, it is very important to secure a proper maintenance. Loosely embedded slabs, for example, should be stabilized and, if necessary, jacked in an early stadium in order to prevent further damage of these and the bordering slabs. The...

Roundabouts with Concrete Pavements: Austrian Experiences

Members Only

The concrete construction method is predominantly used in Austria for the high-rank road network (motorways, expressways) with heavy traffic and / or a high percentage of heavy vehicles. Re-cently, concrete pavements are also used in case of low traffic loads (track lanes, concrete paving blocks) and for roundabouts. This contribution...

Specifications for the Construction of Steel Fibre-Reinforced Roller Compacted Concrete Roads

Members Only

Depending on the prevailing material and energy prices, concrete roads can be made more cost-effective than asphalt roads. However, to provide a truly sustainable solution, it is necessary to reduce the energy consumption associated with the production and maintenance of concrete roads, as well as to minimise their construction /...