Larger aircraft, heavier lo~ds, in~reasing numbers of load repetitions, but e8pec~ally s~ngle wheel loads of about 33 tonnes have given rise to d~age which has similarly affected airfields all over th~ world. The damage is in part due to the sub-base be1ng too weak and to lack of shear transfer...
Effect of the distribution of air entrained in superplasticized and high workability concrete for traffic areas
For obtaining a high degree of resistance to the action of frost and de-icing salts on concrete, it is essential to have an adequate content of air-filled micropores adjusted to the amount of fine-grained mortar in the mix. With QOI1ventional road concrete, correctly made, it can be presumed that if...
Spanish realizations of steel fiber pavements
The development of the steel fiber reinforced concrete pavements has experienced a big apogee in Spain in the last three years. The object of this work is to display the most important realizations made in the field of roads. harbours, airports, etc., analyzing their characteristics and behaviour. ROADS - Base...
Construction of airfield pavements with concrete
Concrete pavements have for years been successfully used in airfield construction. The relatively high weight of the landing gear of large aircraft requires pavement thicknesses which are considerably higher than those of concrete roads. The construction of airfield concréte pavements requires appropriate placing techniques. On account of the high loads...
A continuously reinforced concrete pavement (0.35 m thick) for the steel mill Sidmar in Belgium
The project consists of the construction of a continuously reinforced steel slag concrete pavement (0.35 m thick) on a base course of slag sand-bound granular material (0.85 m thick). The road (area 8,000 m2, width 10 and 17 m) has to lenable the transportation of hot (800 0 C) steel...
Joint design for concrete pavement on cement stabilized base at Zürich airport
On the concrete pavements of the runways 14 - 32 and 16 - 34, built in 1975 and 1976, cracks developed along the tongue-and-groove longitudinal joints. Investigations into the service conditions of the joints showed that they were overstressed unde r extreme loads and that damage to them could be...
Realization of agricultural roads in concrete in Belgium
The construction of concrete agricultural roads continues to increase in Belgium; latest statistical data show that public autorities still rely on this type of pavement. A new design method was recently proposed and published by the Ministry for the Walloon Area; it is based on simple concepts and its application...
Construction of cycle tracks with cement-bound materials
Cycling is "in". The bicycle manufacturers' sales figures show an increase from 1 million to 5 million machines per year over the period from 1956 to 1980. To extend and develop a cycle track network in response to this increase is a logical consequence. Environmental protection and health-conscious behaviour patterns...
Construction of farm roads with cement-bound sub-bases used as pavement
Many minor roads are constructed with a cement-bound sub-base not provided with a surfacing. Two such experimental se~tions of road are described in this paper. One of these sections comprises a cement-bound crushed stone sub-base (shell limestone 0 - 45 mm size). It was constructed with a binder content of...
Concrete dual-track roads
Fully paved farm tracks which look like roads are coming in for a~ increasing amount of public eriticism, for they do not fit the ima~e of originally unpaved tracks consisting of two parallel wheel paths with a grassed strip in the middle. Trackways built of concrete do resemble the old...
The road: The multifunctional structural element in agricultural areas
Farm roads in interdependence with higher-ranking roads form int~grated traffic networks for the benefit of the rural and urban population. With -tbe many and vari~d duties that such roads perform they func tian more particularly as aids to agricultural and forestry development projects, with effects extending even into the ecological...
Minor roads in concrete
In France, bituminous construction has for decades customarily been used for all kinds of minor roads. There are a great many reasons to explain this tradition. All the same, experiments with concrete have been made year after year, and some day, as a result of further dissemination of information and...