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
  • Pavement cracking
  • Cracking of concrete pavements
  • D cracking Concrete pavements
  • Cracking
  • Pavement cracking
  • Cracking of concrete pavements
  • D 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.
  More +
• Format:
  PDF
• Funding:
  C1896
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24188/dot_24188_DS1.pdf
• File Type:
  [PDF - 2.30 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:82c1249d81116ec655d7d86d4787b1e262ccf1db6d76e07d0c0d133f65fb24c976730087e6e9ddef7537b291e374ffc7e512f24cea4b4b6670adcf4db6f54b09