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:
  • Base course (Pavements)
  • Pavement layers
  • Asphalt pavements
  • Cement
  • Fly ash
  • Waste products (Materials)
  • Aggregates Roads--Base courses
  • Pavements, Asphalt
  • Fly ash
  • Cement
• 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.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23569/dot_23569_DS1.pdf
• File Type:
  [PDF - 2.62 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:ea5f3b09f2530fb8b304b72e78bc0707ded48ce482859962fa8735db87267a285993c7c97316e5cf7fc9f750c49dc80dffc9c080aea64e88fe15590bf2c303b9