Evaluation and field verification of strength and structural improvement of chemically stabilized subgrade soil.

Details

• Creators:
  Snethen,Donald R. ; Miller, Gerald A. ; Cerato, Amy B.
• Corporate Creators:
  University of Oklahoma. School of Civil Engineering and Environmental Science
• Corporate Contributors:
  Oklahoma. Dept. of Transportation. Planning & Research Division ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Additives Chemical Additives Chemicals Chemical Treatment Soil Modification Soils Soil Stabilization Subgrade (Pavements) Subgrade Materials Subgrade Strength
• Publication/ Report Number:
  FHWA-OK- ; AA-5-21008
• Resource Type:
  Tech Report
• Geographical Coverage:
  Oklahoma
• Edition:
  Final report; Oct. 2006-Sept. 2008.
• Corporate Publisher:
  Oklahoma. Dept of Transportation
• Abstract:
  Often subgrade soils exhibit properties, particularly strength and/or volume change properties that limit their performance as a support element for pavements.
  
  Typical problems include shrink-swell, settlement, collapse, erosion or simply insufficient strength. A common approach to subgrade soil support or stability
  
  problems involves chemical modification or stabilization with additives such as lime (hydrated or quick), fly ash (Class C from lignite coal), cement kiln dust
  
  (CKD) or Portland cement. Other additives are available, but this group constitutes the major products or by-products used on roadway construction in
  
  Oklahoma.
  
  The type and amount of chemical additive is dependent on the purpose or function of the treated material (i.e., improved physical properties or improved
  
  strength) and selection is based on accepted or standardized procedures. Questions then arise with regard to chemically treated subgrade soils about the rate of
  
  development and ultimate value of improvement. The purpose of this research is to develop relationships between rate of development and magnitude of
  
  strength (or physical property) improvement for chemically treated subgrade soils.
  
  The research project involved laboratory and field studies of the influence of cementitious additives on the strength and structural improvement of stabilized
  
  subgrade soils. Laboratory tests for measuring strength and structural improvement (e.g. UCS and MR) were conducted on field mixed treated soils and
  
  laboratory mixed treated and untreated soil samples. UCS and MR tests were conducted on samples varying curing time (field and laboratory mixed) and
  
  percent additive used (laboratory mixed). A series of field tests (Nuclear w-γ, stiffness gauge, portable FWD, Dynamic Cone Pentrometer, and PANDA
  
  Pentrometer) were conducted at five field test sites on the untreated subgrade soils and on the treated subgrade soil with curing time as allowed by the
  
  construction schedule. The research project collected a large volume of both laboratory and field data which are summarized in the appendixes (5) to this
  
  report.
  
  
• Format:
  PDF
• Funding:
  ODOT Reference 345901 8052 ; ODOT Job Pieces 01946(50)
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:6266d29dde274d974dd15ab314c894056ee94bf4f000c622bec6e35f4eaab375
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24276/dot_24276_DS1.pdf
• File Type:
  [PDF - 7.65 MB ]