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CONSTRUCTION AND MAINTENANCE OF RIGID PAVEMENTS. REPORT FROM THE GERMAN DEMOCRATIC REPUBLIC --PIARC XVIII WORLD ROAD CONGRESS, BRUSSELS, BELGIUM, SEPTEMBER 13-19, 1987

This report describes the research carried out in the fields of: (1) design and behaviour in service -as regards heavy-duty vehicles representative axle load effects have been determined and taken into consideration for stress indications. Non-reinforced slabs are considered as standard design. Tests have been started with thin concrete slabs and small distances between joints. Precast concrete slabs are employed for lowly stressed areas in residential districts. As to areas less than 2500 m2 in residential streets, preference is given to road concretes using plasticizers. For geometrically irregular areas and for structural reasons concrete block pavement is increasingly used; (2) materials -types of cement are selected according to the c3a content and to the fineness of grinding. Sulphite liquor products are used as air-entraining agents. "viskoment 5" has proved to be very suitable for road concretes using plasticizers; (3) construction and control - for secondary roads, there has been developed and tested a vibrator running on side form rails and provided with different joint strips for vibrating dummy joints into the fresh concrete. Concerning the consistency of fresh concrete at the mixing plant attention should be paid to haulage distance and air temperature. Information is given on the tests carried out of fresh concrete and hardened concrete; (4) maintenance and rehabilitation -the condition assessment is done with the help of a practibility meter and together with additional visual surveys and recording. Above all, care should be taken of the regular renewal of joint sealing and of the guarantee of the surface and infiltration water drainage. In case of surface damages there have been carried out successful full-scale tests by means of thin coating. The overlay of old concrete pavements on motorways is done with the help of new nonreinforced slabs. Previously, the old slabs were subdivided to an edge length of <2 m. A subsequently placed concrete regulating course with joints is covered with a bituminous slurry. An extensive rehabilitation includes supplements and renewals of the drainage installations; (5) subbases and roadbases treated with hydraulic binders -as roadbases there sand concretes have been tested to which, besides cement as binder, have been added higher proportions of pulverized fuel ash rich in lime. The substitution of cement was tested together with the resistance to frost and de-icing salt. In most cases, cement-bound roadbase material is manufactured in concrete mixing plants. Crushed and classified siemens martin slag has stood the test as sub-base below concrete pavement for heavy traffic.(a) for the covering abstracts of the congress see IRRD 812115 and 812116.

  • Corporate Authors:

    Permanent International Assoc of Road Congresses

    27 rue Guenegaud
    Paris,   France 
  • Authors:
    • Wiehler, H-G
  • Publication Date: 0

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00481266
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 30 1989 12:00AM