Beneficial utilization of lime sludge for subgrade stabilization : a pilot investigation.

Details

• Creators:
  Yu, Xiong ; Zhang, Bin ; Cartweight, Donald
• Corporate Creators:
  Case Western Reserve University. Department of Civil Engineering
• Corporate Contributors:
  Ohio. Dept. of Transportation. Office of Research and Development ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Soil stabilization
  • Pavements
  • Subgrade (Pavements)
  • Waste products (Materials)
  • Soil stabilization--Ohio
  • Pavements--Subgrades--Materials--Ohio
  • Waste products as road materials--Ohio
• Publication/ Report Number:
  FHWA/OH-2010/12
• Resource Type:
  Tech Report
• Geographical Coverage:
  Ohio
• Edition:
  Final report; Mar. 2009-July 2010.
• Corporate Publisher:
  Ohio. Dept. of Transportation. Office of Research and Development
• Abstract:
  Water plants annually produce thousands of tons of lime sludge from the water treatment procedures. The lime sludge ; is then discharged into a retention pond. When the storage limit is reached, lime sludge is usually disposed into ; landfills, where they are treated as solid wastes. The large amount of lime sludge available (the quantity of lime sludge ; is estimated to be millions of tons for Ohio alone), the inexpensive (essentially free) material is very attractive if it can ; be used for soil stabilization in transportation constructions. ; In order to use efficiently lime sludge as subgrade stabilization, proper design procedures for lime sludge introduction ; need to be followed to achieve the optimal performance. Besides, the long term performance of lime sludge modified ; soils needs to be verified. The purpose of this study was to determine the feasibility of using lime sludge as subgrade ; stabilization. The study focused on the feasibility of using lime sludge as a substitute of regular lime used in road ; construction, design issues such as, method of lime sludge introduction, the optimum content of lime sludge and the ; long term performance etc. Experimental study was conducted on five typical types of subgrade soils in Ohio as well as ; a high plastic clay soil in Cleveland area. ; Common procedures for determining the optimal lime content for soil stabilization based on pH values are found not ; applicable for lime sludge. Instead, performance criteria based on unconfined compression tests need to be utilized. ; Lime sludge was found to increase the soil deformation modulus and reduce the plastic behaviors. Wet mix and dry ; mix methods do not appear to significantly affect the strength of lime sludge modified soil. Considering of the ; economic factors associated with drying lime sludge, lime sludge can be introduced in the slurry format via the wet mix ; procedure. The existing testing data indicated that lime sludge does not significantly improve the unconfined soil ; strength. Lime sludge however demonstrated the positive effects in reducing the plasticity of soils and improve the ; freeze/thaw durability. The long term performance evaluation could provide data to quantify the effectiveness of lime ; sludge as an economic and sustainable material.
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• Format:
  PDF
• Funding:
  134417
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/18227/dot_18227_DS1.pdf
• File Type:
  [PDF - 1.77 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:c119d584e2b70f575234ff95c5c06021b26160764c56ad0fb512c2394cf45766