Mexico City, one of the largest in the world, supports the traffic of more than 8 million cars. One of the main roads is the Interior Loop, with 42 km length in a 35 meter section. 110,000 cars transit daily on this loop. The maintenance of this road is under...
Influence of Temperature on Falling Weight Deflectometer Test Results on Concrete Pavements
During intensive investigation programme carried out on 90 km of newly constructed motorway with sections of jointed plain concrete pavements (JPCP) with dowels and continuously reinforced concrete pavement (CRCP) a number of different non-destructive tests were carried out before and within first year of their operation. Among others the deflection...
Fast Track Concrete for Repairs in a Continuously Reinforced Concrete Pavement in Spain
A continuously reinforced concrete pavement (CRCP) was opened to traffic in 1976 in the North of Spain. It is located in a 43 km long motorway. Each carriageway is 12,00 m wide (concrete pavement is 8.00 m wide). The top layer is a 22 cm thick CRCP. Longitudinal reinforcement consists...
Ten Years of Good Performance of Ultra-Thin Whitetopping Experiment in Brazil Summary of Main Learnings
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...
Slab Jacking Development of New Materials
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...
A Case History of CRCP Rehabilitation on the E403 Motorway Near Bruges – Belgium
The section of the E403 (A17) motorway between Bruges and Kortrijk was built in continuously reinforced concrete in the early nineteen eighties. The construction work was carried out in four phases with substantial differences between the phases with respect to the width of the pavement, the sub-base and the position...
Thin Concrete Overlays US Case Studies and Performance
The need for optimizing preservation and rehabilitation strategies used to maintain highway concrete and asphalt pavements has never been greater, given the current difficult economical outlook faced by highway agencies. Conventional bonded and unbonded concrete overlays have a long history of successful use to preserve and rehabilitate concrete and asphalt...
Whitetopping with Ultra-Thin Layers of High and Ultra High Performance Concrete
For decades, damaged asphalt or concrete pavements in the U.S. were repaired by applying the "whitetopping technique. This measure covers the damaged pavement with a new layer of a thickness between 15 and 25 cm, in order to re-establish its viability and safety to traffic. In a research project by...
Whitetopping A Quick and Cheap Way to Resolve Rutting
Congestion on German roads increases permanently from year to year. According to the latest prognosis an end to the traffic increase especially with regard to heavy traffic is not in sight. At the same time the Federal government, the German states and communities lack capital for new infrastructure...
Evaluation by FWD and Faultimeter of Concrete Slabs Stability
In order to rehabilitate non-dowelled secondary concrete slab roads or to reduce noise caused by faulting slabs, it is necessary to have a clear understanding of their stability.. Faulting, pumping and the presence of voids must be investigated, and appropriate stabilization measures must be taken. Different investigation techniques are applied...
Experience with the Construction of An Ultra-Thin Continuously Reinforced Concrete Pavement
This paper describes the design and construction of an Ultra-Thin Continuously Reinforced Concrete Pavement (UTCRCP) that has been constructed near Paarl, Western Cape, South Africa. The UTCRCP may be described as a specific implementation of Strain Hardening Cement-based Composites (SHCC) in the field of pavement engineering. Mix design of the...
Demonstrating the Use of Ultra Thin Reinforced Concrete Pavements to Serve Residential Areas in Cities
On 19 May 2006, the Premier of the Gauteng Province in South Africa announced the project: gravel roads to surfaced roads, stormwater drainage and walkways projects within the top twenty townships (20T Project). The main aim of the project was to improve the living conditions of communities in previous neglected...