AN EXPERIMENTAL STUDY OF THE MECHANICS OF TWO WEAKLY CEMENTED SOILS

This work studied the effects of a cementing agent on mechanical behavior of a quartz sand and a natural silt by means of drained triaxial tests. The cementing agent was a cement fly ash slurry, and the specimens so formed were weakly cemented. The higher stiffness of the cemented specimens is explained by presence of structure, but it may not always be valid to equate structure to the contribution of a cementing agent. Special zero effective confinement tests were performed to measure the contribution of bonding between grains to the strength and stiffness of the 2 cemented soils. Results indicate the occurrence of progressive bond breakage prior to failure. At a stress state remote from failure, a cemented soil has lower dilatancy relative to the parent soil due to the presence of significant bonding. However, bond breakage occurring at higher shear stress led to a more dilatant soil fabric. The shear strength data followed a curved failure surface that merged back, at high stress, to that of the parent soil. This feature can be captured by a failure function modeling the contribution of a cementing agent to strength as 2 parts, true bonding between soil grains and increase in dilatancy at failure. Both parts degrade with increasing effective confining pressure, but at different rates.

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  ASTM International

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• Authors:
  • Lo, SCR
  • Lade, P V
  • Wardani, SPR
• Publication Date: 2003-9

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 328-341
• Serial:
  • Geotechnical Testing Journal
  • Volume: 26
  • Issue Number: 3
  • Publisher: ASTM International
  • ISSN: 0149-6115
  • Serial URL: http://www.astm.org/DIGITAL_LIBRARY/JOURNALS/GEOTECH/

Subject/Index Terms

• TRT Terms: Bonding and joining; Cement treated soils; Dilatancy; Fly ash; Foundation soils; Geotechnical engineering; Sandy soils; Shear properties; Silty sands; Soil mechanics; Soil tests; Triaxial shear tests
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00963200
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 13 2003 12:00AM