Measurement of the pore size distribution of limestone aggregates in concrete pavement cores : phase I.

Details

• Creators:
  Riding, Kyle A ; Esmaeily, Asad ; Mirzahosseini, Mohammadreza
• Corporate Creators:
  Kansas State University. Civil Engineering Dept.
• Corporate Contributors:
  Kansas. Dept. of Transportation. Bureau of Materials & Research
• Subject/TRT Terms:
  Concrete Pavements Cracking Cracking Of Concrete Pavements D Cracking D Cracking Concrete Pavements Pavement Cracking
• Publication/ Report Number:
  KS-12-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Kansas
• Edition:
  Final report; April 2011-Nov. 2011.
• Corporate Publisher:
  Kansas. Dept. of Transportation
• Abstract:
  Freeze-thaw damage is one of the common forms of distress for concrete pavements in Kansas. D-Cracking is a form of
  
  freeze-thaw damage caused by aggregates with poor freeze-thaw durability. It is believed that pores in the aggregates below
  
  10 μm in diameter contribute to this poor durability. In this Phase I study, a methodology for preparing limestone coarse
  
  aggregates taken from concrete cores for examination by scanning electron microscopy (SEM) was developed. Software was
  
  developed to quantify the aggregate pore size distribution from the SEM images. The procedure was used on cores from two
  
  concrete pavements with different field performance. The aggregates from one of the pavements studied, pavement B, had a
  
  larger total area of pores and larger number of pores below 1.5 μm2 in area. The aggregates from the other pavement,
  
  pavement A, had a smaller total area and smaller number of pores below 1.5 μm2 in area, but a higher percentage of the
  
  pores were in this smaller pore size range. Cores from the two pavements were also tested for potential alkali-aggregate
  
  reactivity by measuring their length change after soaking in 1N NaOH solution at 80°C. It was found that the aggregates in
  
  pavement B showed much more potential for expansion from alkali-aggregate reaction than pavement A with approximately
  
  0.2% expansion at 28 days for pavement B vs. 0.04% expansion for pavement A.
  
  
• Format:
  PDF
• Funding:
  C1896
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:82c1249d81116ec655d7d86d4787b1e262ccf1db6d76e07d0c0d133f65fb24c976730087e6e9ddef7537b291e374ffc7e512f24cea4b4b6670adcf4db6f54b09
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24188/dot_24188_DS1.pdf
• File Type:
  [PDF - 2.30 MB ]