Resources

Even small repairs on roads and runways are time consuming and lead to long time obstructions. Normal cement type mortars and concretes do exhibit iallier long hardening times and are therefore, not suitable for fast track repair. Non cementitious repair materials like resin types have other disadvantages as being only...

Field tests have been carried out with thin, high strength concrete overlays (whitetoppings) placed on top of the milled asphalt pavement The aim is to find methods to restore rutted asphalt pavements and iliclease their rutting resistance. The whitetopping was limited to 70 mm. Both plain and steel fibre reinforced...

Since 1970, several highways in South Africa were cujistructed in Portland cement concrete, the only design being used was the jointed unreinforced concrete pavements. Due to early deterioration as a result of alkali aggregate reaction, one section had to be overlayed In order to determine the last option, several experimental...

Ultra-thin whitetopping (UTW) is one of the newest and most innovative applications of portland cement concrete. The technique entails bonding a relatively thin layer of concrete onto an existing asphalt pavement. This technique was conceived in the United States of America and the first experimental project was built in Louisville,...

The effectiveness of thin bonded overlays depends upon the adhesion level at the interface with the existing concrete pavement. It appears that shrinkage, particularly at the very early ages (18-24 hours), is mainly responsible for delamination, i.e. separation between old pavement and overlay. The present paper discusses the results of...

Precast concrete pavcmrnts have the merit to supply concrete slabs of good quality. In the concstructiori of precast concrete pavements, it is not necessary to use any special machines. And the special merit is that traffics can open immediatly because of unnecessary of curing. So this type of concrete pavement...

In connection with a rehabilitation project, the long-term performances of 15km existing old jointed pavement were comprehensively surveyed. The collected data included visual conditions, roughness measurements, core tests, and FWD defleLtions. By analyzing the FWD measurements, the in situ struchiral moduli were backcalculated, and then, the fatigue damage of existing...

This paper describes a method for routinely evaluating airfield pavement surface roughness from an aircraft ride quality perspective. The method is designed to be as compatible as practical with existing pavement management system data collection and reporting processes. Ride quality has always been recognized as a major factor in a...

When heavily trafficed concrete pavements are being renewed, the work generally has to be carried out under considerable time-pressure. A newly developed, high performance repair concrete is ideally suitable for such repair work on account of its high early and final strength as well as its durability. It is produced...

Conventional maintenance of rutted asphalt roads means resurfacing in short intervals or substitution of thick layers. Therefore, a new repair method was tested: Milling the top of the existing asphalt pavement, cleaning the surface and plaeing a dan layci of high performance concrete. The behaviour of the composite structure was...

Opening concrete pavements to traffic the day after placing has been a routine practice in Vienna for many years, but increasing traffic requires even shorter closure times. On motorways even a single lane can be closed to traffic only at night or at weekends. With a w/c of 0,35 and...

This paper describes the processes carried out in the crack and seat of an existing concrete pavement on the M40 Motorway in England.