Evaluation of cement and fly ash treated recycled asphalt pavement and aggregates for base construction.

Details

• Alternative Title:
  Evaluation of cement and fly ash treated RAP and aggregates for base construction
• Creators:
  Rupnow, Tyson ; Icenogle, Patrick ; Reech, Scott
• Corporate Creators:
  Louisiana Transportation Research Center
• Corporate Contributors:
  Louisiana. Dept. of Transportation and Development ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Aggregates Roads--Base Courses Asphalt Pavements Base Course (Pavements) Cement Fly Ash Pavement Layers Pavements, Asphalt Waste Products (Materials)
• Publication/ Report Number:
  FHWA/LA.11/481
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• Edition:
  Final report; Mar. 2009-Mar. 2011.
• Corporate Publisher:
  Louisiana Transportation Research Center
• Abstract:
  Many entities currently use recycled asphalt pavement (RAP) and other aggregates as base material, temporary haul roads,
  
  and, in the case of RAP, hot mix asphalt construction. Several states currently allow the use of RAP combined with cement
  
  for a stabilized base course under both asphalt and concrete pavements. Currently, there is disagreement on what properties
  
  are required, and how to test the cement and fly ash treated RAP for both asphalt and concrete pavement structures.
  
  The objective of this study was to determine feasibility of cement and fly ash treated RAP and other aggregates as a
  
  structural layer for both portland cement concrete and hot mix asphalt pavement systems. A 610 limestone from Kentucky
  
  was used as the reference material. Other materials used in the study include: Mexican 610 limestone, gravel and limestone
  
  based RAP, and blended calcium sulfate (BCS). Samples were prepared with three cement and fly ash contents and tested
  
  for compression and flexural strength. Length changes specimens were also produced and the resilient modulus was
  
  measured.
  
  Mixtures achieving 150 and 300 psi are capable of being produced with 4 to 8 percent portland cement and 10 to 20 percent
  
  class C fly ash. The compacted specimens achieved equal to or up to two and a half times greater compressive strength than
  
  those samples that were uncompacted. The reference and Mexican 610 limestone’s produced much higher strengths
  
  compared to the RAP BCS mixtures. The BCS mixtures proved adequate in terms of shrinkage, strength, and did not fall
  
  apart when stored in the 100 percent humidity room or underwater for the requisite 14-day cure period for the length change
  
  test.
  
  The resilient modulus results were similar across all samples, but no discernible trend could be determined, most likely due
  
  to the test containing only one sample for analysis. The results show that cement and fly ash treated RAP and other
  
  materials can be used in base course construction.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:ea5f3b09f2530fb8b304b72e78bc0707ded48ce482859962fa8735db87267a285993c7c97316e5cf7fc9f750c49dc80dffc9c080aea64e88fe15590bf2c303b9
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23569/dot_23569_DS1.pdf
• File Type:
  [PDF - 2.62 MB ]