Ultra thin white topping is a rehabilitation technique in which thin concrete overlay is placed on asphalt pavement in distress, and this work technique has been under research in Europe, USA and other countries. In this study, a small model experiment was conducted to see its applicability to the roads...
Rehabilitation of Concrete Slabs by Sifcon-Overlays
A new means for rehabilitation of severely cracked concrete slabs is a thin overlay of SIFCON (Slurry Infiltrated Fibre Concrete). This high strength concrete with an extremely high content of conventional steel fibres (about 10 % of volume) was invented in the USA and further developed by the central laboratory...
Renovation of an Apron in Front of a Hangar on Brussels National Airport Using Quick-Setting Concrete
The pavement of the apron on Brussels National Airport, which was constructed in the early sixties, was forming cracks. Given that fragments of concrete could in time be a danger to the aircraft engines, a thorough renovation of the apron was imperative. The distinctive feature of the site is that...
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...
Overlaying and Behavior of Lorient-Lann Bihone Main Runway with Continuously Reinforced Concrete (CRC)
The main runway of Lorient-Lann Bihoud airport was overlayed with continuously reinforced concrete in 1989. This operation is examplary because from the technical viewpoint it is still today the only one in Europe. This runway is used now for eight years by civil and military traffic. The cracking development is...
Reconstruction of Urban Highways
Due to the ever increasing traffic volumes, the repair of concrete pavements has become one of the most difficult problems. One of the means to help resolve this problem is the use of a high early strength concrete. At the Department of Civil Engineering of the K.U.Leuven a research program...
Concrete Requirements for Ultra-Thin Concrete (Whitetopping) for Flexible Pavements
Whitetopping solutions for old flexible asphalt pavement overlays have been a challange for highway agencies and designers in the recent past years, with special regards to ultra-thin concrete overlays, also called by ultrathin whitetopping (UTW). Considering the needs of full bond between the UTW and the old asphalt concrete (AC)...
Belgian Applications of Concrete Inlays on Motorways
Today all highways and road managers are confronted with the problem of the rutting of dense asphaltic concrete roads due to the steady traffic increase of heavy vehicles. Consequently, the lifetime of the low speed right lane decreases much faster than the lifetime of the left lane, which is merely...
Roundabouts with Continuously Reinforced Concrete Pavements
Roundabouts have already been used in Belgium for several years to regulate traffic at major road intersections. The surfaces at roundabouts are particularly subject to tangential stresses that result from centrifugal forces and from the overload on the outside wheels by the more or less significant tilting of the vehicles...
Pre-Evaluation of Hydro-Demolished Concrete Surfaces by Dulled Core Testing
The paper contains investigations of concrete debris generated during the compression testing of drilled cores and during hydrodemolition, l3ased on sieve analyses, average diameters of the debris samples are estimated. It is found that a fairly linear relation exists between the average size of the debris generated during the compressive...
The Importance of Continuous Slab Support and Load Transfer at Joints in the Performance of Thin Concrete Overlays
Studies on the structural performance of existing Portland cement concrete roads in South Africa (1) have shown that the traffic utilizing these roads is not the pnme initiator of structural failures. Factors such as construction, environment and slab support conditions are predominant in initiating structural failures. However, it is also...
Performance of Precast Prestressed Concrete Pavements Prestressed at Joints
The precast prestressed cornrele pavement (PPCP), which allows rapid execution of repair works such as these on intersections, is inasinglyuse1 these days. It contains many joints that conventionally take the form of dowel bars, which, however, are reported to be vuhierable to damage by rainwater seepage and other factors. To...