Monitoring and evaluation of fly ash stabilization stabilized subgrade constructed by the Wisconsin Department of Transportation.

Details

• Alternative Title:
  Monitoring and evaluation of fly ash stablilization stabilized subgrade constructed by the Wisconsin DOT ; Monitoring and evaluation of fly ash stablilization stabilized subgrade constructed by the WISDOT
• Creators:
  Edil, Tuncer ; Benson, Craig H. ; Tastan, Onur ; Li, Lin ; Hatipoglu, Bulent ; Martono, Hilfung
• Corporate Creators:
  University of Wisconsin--Madison. Department of Civil and Environmental Engineering
• Corporate Contributors:
  Wisconsin. Dept. of Transportation. Research Coordination Section
• Subject/TRT Terms:
  Crushed Rock Durability Pavements--Wisconsin--Subgrades Fly Ash Fly Ash--Wisconsin Monitoring Soil Stabilization--Wisconsin Subgrade (Pavements) Subgrade Materials
• Publication/ Report Number:
  0092-04-10;WHRP 10-06
• Resource Type:
  Tech Report
• Geographical Coverage:
  Wisconsin
• Edition:
  Final report.
• Corporate Publisher:
  Wisconsin Highway Research Program
• Abstract:
  This report describes the monitoring and evaluation of a field site where Class C fly ash was used to stabilize the
  
  subgrade during construction of a rigid pavement in a portion of USH 12 near Fort Atkinson, Wisconsin.
  
  Additionally, information from a second similar project (STH 32 near Port Washington, WI) that was monitored only
  
  during construction and a third project (STH 60 near Lodi, WI) that was monitored for 8 years is reported. The
  
  following observations are made based on this investigation:
  
  1. All of the tests consistently indicated that the stiffness and strength of the subgrade were improved significantly
  
  by fly ash stabilization at all sites. Observation during construction, however, clearly demonstrated the benefit of
  
  fly ash stabilized subgrade (FASS) because once the fly ash is mixed and compacted in a window of dry weather
  
  the FASS remained stiff in subsequent rain events.
  
  2. It is noted several significantly different soil types were encountered in all sites and the fly ash contents and
  
  moisture contents were variable (10% and 12% and 7-14%, respectively). Resulting California bearing ratio and
  
  moduli also varied. The gain in stiffness and strength are typically 2-3 times due to fly ash stabilization. In situ
  
  stiffness measured with the soil stiffness gage and dynamic cone penetration index also illustrated that the
  
  addition of the fly ash and compaction increased the strength and stiffness appreciably. These findings suggest
  
  that fly ash stabilization of subgrade should be beneficial in terms of increasing pavement capacity and service
  
  life.
  
  3. The data also indicates a complex relationship between base soil type, amount of fly ash, and water content. For
  
  instance, in some soils (e.g., clay) the effectiveness of stabilization decreases when the water content of the soil
  
  increases whereas in some other soils (e.g., sandy) it increases. Therefore, a careful mix design is needed for fly
  
  ash stabilization involving all potential subgrade soils. The results from all sites also confirm that fly ash
  
  stabilization results in a relatively stiffer layer irrespective of the type of soil.
  
  4. Resilient Modulus of the field-mixed FASS is close to that of undisturbed samples of FASS obtained by thinwall
  
  tube sampler. Thus, the field-mixed FASS can be considered to be an effective method of assessing the in
  
  situ soil stiffness.
  
  5. Moduli back-calculated from the falling weight deflectometer (FWD) test data indicated that, modulus does not
  
  display significant reduction over the years.
  
  6. Pavement distress surveys indicate that fly ash stabilized sections perform comparable to control sections
  
  stabilized with breaker run.
  
  7. Percolation from the pavement varies seasonally. Concentration of some elements from the leachate exceeded
  
  the Wisconsin preventive action and enforcement limits. However, these concentrations are expected to fall
  
  below the limits during transport to the groundwater table.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:7ce07388ac996f140d3438e904623617ab33ae9fc3dcf21e4e95a208e3d5cc376086e4a80db25021aa4b98e313394339a3898e03242821b936a89c707c1b0d08
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/18110/dot_18110_DS1.pdf
• File Type:
  [PDF - 5.35 MB ]