CONDITION OF TWO CONCRETE ROADS BUILT IN THE 70S

70-TALETS BETONGVAEGAR. TILLSTAAND OCH UNDERHAALLSKOSTNDER

The report gives an account of the condition of the last two concrete roads constructed in Sweden and the experience gained from their operation and use: a) E4 Vaela-Hylling, 6 kms, constructed in 1978, b) E6 Malmoe-Vellinge, 12 kms, constructed in 1972. The design of the road pavement using a 150 mm cement stabilised gravel (CG) base coarse and 200 mm concrete (K45) on the reinforcement layer of gravel provides a satisfactory bearing capacity on Swedish moraine clays with an annual average daily traffic flow of approximately 15 000 vehicles (of which heavy traffic approximately 10 per cent). A motorway (salted in winter and with a coastal climate) constructed using K45 road concrete and with quartzite as ballast, with an annual average daily traffic flow of some 15 000 vehicles and with 50 % of these vehicles using studded tyres for some 4 months of the year, can be expected to have a life of some 20 years without any measures being required to deal with wheel tracks (max approximately 17 mm). Greater attention should be paid to the construction of high banks and transition sections at bridges to avoid subsidence which causes cracks and unacceptable IRI values (International Roughness Index). Better timing for the sawing of joints must be attained from the very start of production in order to avoid contraction cracks. The movement of traffic sideways by adjusting traffic line markings should be investigated as an alternative to "milling" or recasting on future roads. This alternative would appear to be even more viable with the new durable concrete. The centre line should always be placed to the right of or on top of the centre joint. The joints should be sealed with sealing compound so that the CG layer does not disintegrate. The selection of sealing compound is of great importance for the function of the joints. The shoulder of the road should be designed with a high degree of bearing capacity and with a high quality sealing compound is of great importance for the function of the joints. The shoulder of the road should be designed with a high degree of bearing capacity and with a high quality sealing compound in the pavement concrete joint. On the Malmoe-Vellinge road (1972) 4,7 % of the concrete slabs exhibit some form of damage. The corresponding figure fore the Vaela-Hylling road is 2,8 %. The friction value on the concrete pavement is about 0,6. This can be compared with an asphalt pavement which has a friction value of 0,7-0,9. Maintenance has hitherto been moderate. It has included the maintenance of seals and the recasting of a few slabs where subsidence has occurred. There are however problems with bearing capacity and durability of the shoulders. Winter maintenance of concrete pavements is comparable with asphalt surfaces except that when roads become slippery due to frost there can be a shift in time (both later and earlier) when the slipperiness occurs. Tracks caused by wheels have a depth of about 1 mm/year. The noise level on well worn concrete

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  • Corporate Authors:

    Nordiska Vaegtekniska Foerbundet

    Vaegverket
    Borlaenge,   Sweden 
  • Authors:
    • HULTQVIST, B-AA
    • Fagergren, P
    • Pettersson, S
    • Thomasson, C
  • Publication Date: 1989

Language

  • Swedish

Media Info

  • Pagination: 20 p.
  • Serial:
    • NVF RAPPORT
    • Issue Number: 1989
    • Publisher: NORDISKA VAEGTEKNISKA FOERBUNDET
    • ISSN: 0347-2485

Subject/Index Terms

Filing Info

  • Accession Number: 00607027
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: :5
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1991 12:00AM