EROSION RATE OF DISPERSIVE AND NONDISPERSIVE CLAYS

Erosion rates of unsaturated compacted sodium and calcium montmorillonite clays are measured under a range of tractive shear stresses. The calcium montmorillonite is treated with additives calcium chloride and sodium carbonate to obtain samples with different chemical compositions. Samples are compacted at near the optimum water content and subjected to flowing water in the flume. The tractive stress is determined by measuring the velocity distribution of the flow and using the Prandtl-von Karman equation. The tractive stress ranges from 1.67-12.9 Pa. The erosion rate of calcium montmorillonite (a nondispersive clay) is two orders of magnitude higher than that of sodium montmorillonite (a dispersive clay). When calcium montmorillonite is treated with 0.88% by dry weight sodium carbonate, the erosion rate is reduced to the same order as sodium montmorillonite. Empirical equations are developed to estimate the erosion rate of compacted unsaturated montmorillonite clay as a function of the sodium adsorption ratio and tractive stress.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339410
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Shaikh, A
  • Ruff, J F
  • Charlie, W A
  • Abt, S R
• Publication Date: 1988-5

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 589-600
• Serial:
  • Journal of Geotechnical Engineering
  • Volume: 114
  • Issue Number: 5
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9410

Subject/Index Terms

• TRT Terms: Adsorption; Calcium chloride; Clay; Compacted clays; Equations; Erosion; Estimating; Montmorillonite; Rates; Shear stress; Sodium; Sodium carbonate; Soils; Unsaturated soils
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00469363
• Record Type: Publication
• Report/Paper Numbers: ASCE Paper No. 22433
• Files: TRIS, ATRI
• Created Date: Jul 31 1988 12:00AM