Construction

Aggregates from crushed road concrete were tried in 7 test sections, and 84 samples from some lOcrushing plants were :ested in the laboratory. lt has been shown that aggregates suitable for re-use in sub-Jases or road bases can be produced not only in fixed plants butalso by small mobile crushers,...

The rapid reconstruction of concrete slabs on airfield runways is a technology presented to airports operation authorities in order to strictly shorten the reparation period when the runway is unpracticable. The French airports and airbases engineering services proceeded with two demonstration works on the BORDEAUX and NlMES airports. The reconstruction...

dfred McAlpine Construction Ltd have constructed 20 kilometres of concrete carriageway using slipform pavers; 00 kilometres of which have been completed since 1983. This aper sets out the philosophy and experience of this firm with egard to the construction since 1983. It highlights the decision laking processes undergone at tender...

Recyclingmaterials and industrial by-products are suitable for building purposes if the constructions made of them adequately withstand all loads occuring during the scheduled period of utilization and if they do not affect the environment unac-ceptably. Therefore the evaluation of recycling-and secondary materials must cover both the cons-tructional and the ecological...

Since 1983, most of the work sites in France using Continuously Reinforced Concrete have been for overlaying work on existing motorways in service. As regards methods and equipment, this has necessitated high output production facilities to allow work to be complete as quickly as possible so as to minimize inconvenience...

vlaterials used as joint sealants on concrete pavements are zenerally classified in: - Preformed sealants. - Field molded sealants. l'his work shows the demanded characteristics for preformed .ealants and field molded sealants. The last ones are divided in :wo types: thermosetting -two component systems- coldap-rlied, and thermoplastics --one component- bot...

Diamond grinding of a new concrete pavement surface produced an improvement on the road sur-face evenness which was evaluated in almost twounits in the International Roughness Index scale(mikm). This improvement was achieved mainlybecause of the removal ofroad irregularities withshort and medium wavelengths (0,5m

Two different pavement structures as part of one and the same transverse profile, or a specific treatment for a slow lane extremely liable to rutting.

The dream of concrete pavement constructors, to replace the conventional difficult-to-fix reinforce-ments, which require a considerable manual work-force, with a continuous bobbin-wound reinforce-ment, has today become a reality. The chosensolution was a weldable carbon steel, with an elas-ticlimitgreater than 700MPA, a rectangular cross-section 40 mm x 2 mm, slotted for...

Tire-road noise can be reduced considerably by providing a suitable surface geometry. According to the new Austrian specifications pa-vers must be fitted with a longitudinal smootherto eliminate any transverse waves produced by thebeams of the paver. In order to obtain a noise-reducing surface a longitudinal texture (e.g.. a burlap drag)...

The 1860 kilometre GDR motorway network was mainly built in concrete slab construction before 1945. Its overall reconstruction is vital. In the course of reconstruction work a number of different paving variants were put into practice. The covering of unbound and nearly impermeable bases needed the drainage of the intermediate...

This paper presents aspects of liquid sealant installation and behaviour in joints in concrete roads under South African con-ditions. It covers joint preparation, installations techniques,quality control and field testing. A description of the generictypes of liquid sealants is given as well as behaviour charac-teristics obtained from laboratory tests which included:...