THE EFFECT OF BENTONITE ON THE SKIN FRICTION IN CAST-IN-PLACE PILES AND DIAPHRAGM WALLS

Bentonite, a colloidal clay of volcanic origin, has been used since about 1958 to support the sides of excavations for cast-in-situ piles or retaining walls. This paper outlines an investigation into the existence of a filter cake of bentonite between the concrete and the soil subsequent to concreting. On two construction sites in Durban the filter cake was found to be of a substantial thickness. A laboratory investigation into the filtration characteristics of a bentonite slurry was also performed. The effects of pressure load, permeability of the subsoil and time on the rates of formation of the filter cake have been studied in detail. It is possible that the bentonite filter cake has a high strength. /Author/TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/869610732
• Corporate Authors:

  South African Institute of Civil Engineers

  2 Hollard Street
  Johannesburg,   South Africa 
• Authors:
  • Pells, P
  • Robertson, A
  • WATES, J A
  • Knight, K
• Publication Date: 1975

Language

• English

Media Info

• Features: Figures; Photos; References;
• Pagination: 6 p.

Subject/Index Terms

• TRT Terms: Bentonite; Bentonite slurry; Cast in place concrete; Conferences; Diaphragm walls; Filters; Filtration; Friction; Grout; Loads; Permeability; Pits; Pressure; Seepage; Soils; Strength of materials; Subsoil; Support piles; Time
• Old TRIS Terms: Bentonite-cement slurry
• ITRD Terms: 4186: Bentonite; 4781: Cast in situ concrete; 8525: Conference; 5702: Excavation pit; 7182: Filter; 5452: Friction; 4729: Grout; 5567: Load; 5921: Permeability; 3399: Pile; 5412: Pressure; 4315: Seepage; 4156: Soil; 5544: Strength (mater); 2930: Subsoil; 5414: Time
• Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00134351
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• ISBN: 86961 0732
• Report/Paper Numbers: Conf Paper
• Files: ITRD, TRIS
• Created Date: Sep 16 1976 12:00AM