Influence of rock salt impurities on limestone aggregate durability : final report.

Details

• Creators:
  Riding, Kyle A ; Varner, Jonathan ; Armstrong, Cale
• Corporate Creators:
  Kansas State University. Transportation Center ; Kansas State University. Department of Civil Engineering
• Corporate Contributors:
  Kansas. Dept. of Transportation. Bureau of Research
• Subject/TRT Terms:
  Aggregate Durability Coarse Aggregates Concrete Pavements Deicing Chemicals Freeze-thaw Cycles Freeze Thaw Durability Freeze Thaw Tests Halite Limestone Aggregate Limestone Aggregates Pavement Performance Rock Salt

  More +
• Publication/ Report Number:
  K-TRAN: KSU-12-6
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final report
• Corporate Publisher:
  Kansas. Dept. of Transportation. Bureau of Research
• Abstract:
  Non-durable coarse aggregate in concrete pavement can break down under repeated freeze-thaw cycles.
  
  Application of rock salt may increase the severity of exposure conditions because of trace compounds, such as calcium
  
  sulfate, in rock salt. Concrete and saw-cut limestone specimens were also subjected to wet-dry cycles in varying salt
  
  solutions to examine the influence of trace compounds in rock salt. Subsequently, limestone aggregate in concrete was
  
  subjected to freeze-thaw cycling in two methods: salt-treating the aggregate before batching concrete, and halfimmersing
  
  concrete specimens in rock salt solution during freeze-thaw cycling. The wet-dry testing of cut limestone
  
  was not severe enough to determine the effects of trace compounds in salt solution. Preliminary experiments showed
  
  that salt-treating the aggregates before batching concrete showed more promise in differentiating aggregate quality or
  
  in gaining insights into concrete pavement performance. Concrete prisms were made using 12 different salt-treated
  
  aggregates and were tested according to Kansas Test Method KTMR-22 (2006) and additionally ASTM C666 (2008)
  
  using Method A. Companion prisms were made using the same aggregates without salt treatment and were tested using
  
  the same two freeze-thaw test methods.
  
  Use of saw-cut limestone prisms for testing the freeze-thaw durability of concrete aggregates is not
  
  recommended as crushing limestone may change its properties, prisms from the same source have variable quality, and
  
  prisms are labor-intensive to make. Further testing should be conducted to validate the potential use of ASTM C666
  
  Method A as a method to achieve similar freeze-thaw acceptance results as Method B in fewer freeze-thaw cycles.
  
  Freeze-thaw tests of concrete made with aggregates presoaked in salt brine could provide a good method to test the
  
  effects of salt exposure on internal freeze-thaw distress on the paste portion of the concrete. However, salt treatment
  
  may not be an effective method to use for coarse aggregate qualification.
  
  
• Format:
  PDF
• Funding:
  C1913
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:dae2cf4ff3a728d1c576668544218f86875edcdb2004198603bccc44e915d9af54a61425781bc957b2af3c6983a3cd84ff2e87911824fa4a422db6e1c920a8b9
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31028/dot_31028_DS1.pdf
• File Type:
  [PDF - 3.65 MB ]