LEACHING CORROSION OF ASBESTOS CEMENT PIPES

This paper describes the leaching corrosion of asbestos cement pipes and its influence on their durability and failure in service. The chemical stability, and ultimately the durability, of cementitious products is related to the free lime content (calcium hydroxide) present in the hydrated products and the aggressiveness of the surrounding media. Free lime content of asbestos cement samples from new and used pipes, conducting fresh and brackish water has been measured and analysed. Special apparatus was fabricated to measure the permeability of the abbestos cement matrix to demonstrate the leaching phenomena. The average free lime content of unused asbestos cement pipes was found to vary between 13.1 per cent and 23.3 per cent with an average value of 16.8 per cent, while the free lime content of samples from burst pipes conducting fresh water varied between 3.5 per cent and 13 per cent with an average value of 8.7 per cent. On the other hand, samples from burst pipes carrying brackish water had a free lime content in the range of 11.5 per cent and 20.7 per cent. It is concluded that leaching of free lime is taking place in fresh water pipes for the very soft water, affecting the porosity and permeability of the asbestos cement pipes; once leaching has progressed, it will lead to deterioration and eventual bursting under pressure. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02625075
• Corporate Authors:

  Construction Press

  Longman House, Burnt Mill
  Harlow, Essex CM20 2JE,   England 
• Authors:
  • Al-Adeeb, A M
  • Matci, M A
• Publication Date: 1984-11

Media Info

• Features: Photos; References; Tables;
• Pagination: p. 233-240
• Serial:
  • International Journal of Cement Composites and Lightweight Concrete
  • Volume: 6
  • Issue Number: 4
  • Publisher: Longman Group UK Limited
  • ISSN: 0262-5075

Subject/Index Terms

• TRT Terms: Aggressive waters; Asbestos; Asbestos cement; Calcium hydroxide; Calcium oxide; Cement; Concrete; Corrosion; Deterioration; Drainage; Durability; Failure; Fresh water; Leaching; Permeability; Pipe
• Geographic Terms: Kuwait
• Old TRIS Terms: Asbestos cement products
• ITRD Terms: 5951: Aggressivity (of water); 4528: Asbestos; 4758: Cement; 4755: Concrete; 5255: Deterioration; 2937: Drainage; 5910: Durability; 5520: Failure; 8056: Kuwait; 5276: Leaching; 4574: Lime; 5921: Permeability; 3361: Pipe
• Subject Areas: Bridges and other structures; Highways; Hydraulics and Hydrology; Materials; Planning and Forecasting; I26: Water Run-off - Freeze-thaw; I32: Concrete; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00395517
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Oct 31 1985 12:00AM