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Joint design for concrete pavement on cement stabilized base at Zürich airport

Conf-paper-iscr

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...

Influence of Thermal Gradiente on Non-Destructive Evaluation of Concrete Pavements

Conf-paper-iscr

The non-destructive evaluation of a concrete pavement must account for the temperature warping condition of the slab at the test time. In fact the thermal gradients induced in the slab by the daily temperature variations cause the temperature warping of the slab and this affects the value of the maximum...

Mix design and properties of lean concrete for sub-bases

Conf-paper-iscr

The principal criteria applicable to the mix design and the properties of lean concrete are: - splitting tensile strength in the region of 1.7 MFa and compressive strength in the region of 15 MPa at 28 days; - good erosion resistance; - lowest possible modulus of deformation; - possibility of...

A continuously reinforced concrete pavement (0.35 m thick) for the steel mill Sidmar in Belgium

Conf-paper-iscr

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...

Critical assessment of various construction techniques

Conf-paper-iscr

The long-term behaviour of various types of road pavement construction can be estimated or prognosticated from a methodical assessment of the condition of the roads and the associated data collection. Prognoses can be made not only with regard to technical cri teria, but also with regard to overall cost trends...

Results of measurements on concrete roads

Conf-paper-iscr

Besides theoretical work, investigations on specimens in the l~boratory and practical tests, in-situ measurements provide the means of assessing and further developing new concrete pavement systems. It emerges that, apart from the behaviour of a c?nc7e~e pavement at an early age (random cracking), s~gn4flcant changes (e.g., sinking, opening of joints....

Effect of cement-bound sub-bases on cracking

Conf-paper-iscr

Cement-bound sub-bases (CaSBs) are constructed ~ithout joints. During and after hardening, cracks may be formed in consequence of drying and/or cooling, even if the sub-base has noc yet been subjected co any traffic load. It would be desirable to have no cracks or only very fine ones (capable of eransmieting...

Construction of airfield pavements with concrete

Conf-paper-iscr

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...

Recommendation for the maintenance of concrete roads in the Federal Republic of Germany

Conf-paper-iscr

The "Code of practice for the maintenance of concrete roads" ("Merkblatt für die Erhaltung von Betonstrassen") was published in the Federal Republic of Germany in 1985. It is based on the 1968 edition, but clearly reflects further developments in maintenance techniques, e. g., improved drainage. The code forms part of...

Connecting devices between concrete road pavements and existing highway structures

Conf-paper-iscr

Civil engineering structures, such as bridges, flyovers and underbridges, are discontinuities in a concrete road. Usually, the concrete pavement has to be cut across and in those cases, such as small underbridges, where the concrete pavement can be laid without any discontinuity, differential settlements between embankment and structure have to...

Side drainage and sub-soil drainage layer operation and performance

Conf-paper-iscr

A very favourable result emerges from the assessment of the soundness of structural arrangements adopted and developed over the past ten years (3rd International Conference at Purdue, April (985). After briefly reviewing this positive achievement resulting from closely concerted action of road managers, practical engineers and researchers, the authors more...

Spanish realizations of steel fiber pavements

Conf-paper-iscr

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...