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Magnitude assessment of free and hydrated limes present in RPCC aggregates.

File Language:
English


Details

  • Creators:
    Gupta, Jiwan D. ; Dollimore, David
  • Corporate Creators:
    University of Toledo. Dept. of Civil Engineering
  • Corporate Contributors:
    Ohio. Dept. of Transportation ; United States. Federal Highway Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA/OH-2002/014
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Ohio
  • Edition:
    Final report.
  • Corporate Publisher:
    Ohio. Dept. of Transportation
  • Abstract:
    The tendency of tufa to block pavement drains in northeastern Ohio can be associated with the total calcium content of the ; aggregate material. In the present project, recycled Portland Cement Concrete (RPCC) aggregates are examined when ; leached with acidic water formed by carbon dioxide dissolved in water. The RPCC aggregates were supplied by the Ohio ; Department of Transportation (ODOT) from various sections of the interstate highways in the state of Ohio. The locations of ; sample and a summary of the components in terms of course aggregate, fine aggregate, and cement are quoted in the study ; of D-cracking report. All the RPCC aggregates were around 30 years old. X-ray power diffraction (XRD) data and thermal ; analysis (thermogravimetry, TG and differential thermal analysis, DTA) data established the portlandite, dolomite, and calcium ; carbonate content of the RPCC aggregates. The presence of quartz is established from the DTA plots and its relative ; abundance established from the XRD data. The ethylene glycol test indicated that the free calcium oxide content has been ; reduced in most samples to around 0.5% due to carbonation over 30 years. ; All the samples were subjected to leaching tests in the presence of acidic water (CO2 in water) and the concentration of Ca2+ ; and Mg2+ ions established using Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES). A ratio of Mg/Ca ; ions >0.60 indicates that the aggregates have higher concentration of Ca+2 ions and may result in the precipitation of calcium ; carbonate or tufa. In laboratory studies, the ambient temperature of pouring of concrete (below 500 F) has shown a higher ; incidence of tufa precipitation. It may be due to incomplete hydration. The study recommends establishing Mg/Ca ratio ; before using RPCC aggregates as base/subbase course. Also it is recommended to limit the use of RPCC aggregates to ; coarse size only.
  • Format:
    PDF
  • Funding:
    State Job No. 14676(0)
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/20623/dot_20623_DS1.pdf
  • File Type:
    Filetype[PDF - 6.00 MB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha-512:e41a2a0ac982db6e7a5105e8c804ebbdfe91da6a0b954b9fc4393621098f7033332009d8d436f1e83ceff883a84e82df035937d59c02a76bab7680fea647c658
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