A special session of the 65th annual meeting of the Transportation Research Board in Washington, in January 1986, brought together some 50 practitioners and research workers on the theme "Erosion of sub-bases; stepping of slabs and pumping of concrete pavements"; ~he presentation of 3 U.S. papers and two French ones...
Erosion of concrete pavement sub-bases
Experiences with a slipform paver equipped with a dowel placing device
On the basis of experience gained on the Wildon road construction section it can be stated that slipforming is technically superior to conventional concrete placing. This applies more particularly to the better flexural strength of the top-course and bottom-course concrete in the pavement slab, the better evenness (riding quality), the...
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...
Thin continuously reinforced concrete and steel fibre reinforced concrete overlays – Performance assessment after two and three years in service
Seven experimental sections of thin overlay construction on old concrete and asphalt road pavements have been built in Belgium since 1982. These comprise a total area of 107 000 m2 of fibre reinforced concrete (five sections) of la cm and 12 cm thickness and 34000 m2 of continuously reinforced concrete...
Design and construction of noise-abatement devices along roads
Roads now ofcen have to be provided wich noise control scructures, those most commonly employed being earthbanks, steep-faced banks, acoustic screens and noise reduccion barriers. Large installations and special structures for noise control purposes are more rarely encountered. "Steep-faced banks", which occupy less space than earth-banks, consist of a supporting...
Improved jointed concrete pavement designs through field observations
This paper will provide specific recommenda~ions for the improvemen~ of jointed concre~e pavement design practice. Tbe recommendations will be based upon findings from a major nationwide research project recen~ly completed in the USA concerning field observations of pavement performance. A concre~e pavement performance database was established and extensive data collected...
Spanish experiences in roller compacted concrete pavements in the years 1984-85
Roller compacted concrete pavements have been used in e~ght experiences, with about 100,000 m2 paved in d1fferent parts of the country and diverse orographical and ~limatological conditions(Barcelona, Valencia, Valladol1d, Leon, Sevilla and Zaragoza). According to the same standard specifications, pavements have been built with different material properties, concrete mixing procedures...
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...
Pavement monitoring and heavy maintenance on the Geneva-Lausanne motorway
The Geneva - Lausanne moeorway, which was commissioned in 1964, comprises about ~5 km of concrete pavement consisting of 20 cm thick doweled slabs (10m x 4m) resting on a non-stabilized 55 cm thick gravel-sand sub-base (0 -100 mm particle size). The subgrade consists of non-stabilized natural insieu soils as...
New Jersey type safety barriers – Experiences in Belgium
This paper reports the experience gained by the Highways Department in Belgium in the construction of so-called New Jersey safety barriers during the past few years. First the reasons why the Ministry of Public Works gave up the more traditional protection systems such as steel or aluminium safety fences are...
Ten years of hydraulic concrete pavement of the Mediterranean 75 highway
The highway Tarragona-Valencia-Alicante, 375 km along che Spanish easccoasc, has 240 km of concrete pavement. It is being used, in sections, since June 1974. Due co the similar climate and geology of California (U.S.A.) and che Spanish Levante, in the initial design of 1972 Californian technology was mainly used. The...
Concrete pavement constructed in extreme atmospheric conditions
In a Spanish road in the main network that joins Zaragoza with Huesca, a 9 km long by~pass is being built, in order to supress two railway grade crossings and improve the location. The structural section consists in 15 em of lean concrete and 25 cm of pavement concrete. By...