Specialist materials and techniques for increasing durability and water resistance in underground structures

Owners and developers are continually faced with underground structures that are barely fit for use. Defects are apparent prior to completion and often-quick temporary fixes are used to accelerate handover. This can lead to major deterioration of the concrete in the first ten to fifteen years and the subsequent cost of repairs. This paper looks in detail at the wide range of materials and systems which claim to increase durability and service life of the underground structure, whilst many of these propriety material systems are of interest in the academic sense they need to be coupled with understanding basic concrete technology for practical application. New codes of practice for construction particularly the new Euro codes do address concrete workability. The use of flow measurement in high fluidity concretes instead of the slump test will lead to easier placement better compaction and improved concrete durability. The use of pozzolonic materials in concrete in Singapore are examined and weaknesses due to the lack of fly ash are noted. The importance of detailing in prevention of leaks in underground structures is critical. Two case histories are outlined showing the ease of slipping from success to initial failures in waterproofing. The author lists his personal views on how to improve durability and watertightness of underground structures. This includes the use of high performance concretes membranes and treatment to joints. Typical detail drawings are provided to illustrate these points. Methods of repair are discussed, as inevitably some things will go wrong. Some of the new repair technologies using two part hydro structure resins are shown with the latest measuring equipment. (A) Reprinted with permission from Elsevier". For the covering abstract see ITRD E124500.

Language

  • English

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Filing Info

  • Accession Number: 01011519
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Dec 19 2005 3:15PM