Observations made of areas of block paving have shown that, although initially permeable, block paving eventually becomes sealed with materials such as detritus, oil and rubber. To establish the level of water penetration in the initial stage, a series of tests was carried out in the laboratory on small areas of block paving subjected to simulated rainfalls ranging from about 25 to 50 mm/h. It was concluded that about 25% of heavy rainfall on newly completed block paving, laid to a fall of 1 in 100 on a freely draining sub-base, could penetrate to the subgrade. This level of penetration is exceptional and is only likely to endure for a short period, as block paving can be partially sealed by very small amounts of detritus. If the subgrade is susceptible to damage by water, it should be protected by a bound suub-base. (a) (TRRL)

  • Availability:
  • Corporate Authors:

    Cement and Concrete Association

    Wexham Spring
    Slough SL3 6PL, Buckinghamshire,   England 
  • Authors:
    • CLARK, A J
  • Publication Date: 1979-11

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00323059
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-7210-1159-4
  • Report/Paper Numbers: Tech Rpt. 529 Monograph
  • Files: ITRD, TRIS, ATRI
  • Created Date: May 21 1981 12:00AM