Calibrating the Iowa pore index with mercury intrusion porosimetry and petrography.

Details

• Creators:
  Hasiuk, Franciszek ; Firdaus, Muhammad ; Ridzuan, Ahmed ; Taylor, Peter
• Corporate Creators:
  Iowa State University. Institute for Transportation
• Corporate Contributors:
  Iowa. Dept. of Transportation ; United States. Federal Highway Administration ; Midwest Transportation Center ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
• Subject/TRT Terms:
  • Porosimeters
  • Porosity
  • Petrography
  • Mercury
  • Coarse aggregates coarse aggregate
  • helium-mercury
  • porosity
• Publication/ Report Number:
  InTrans Project 15-553
• Resource Type:
  Tech Report
• Geographical Coverage:
  Iowa;United States
• Corporate Publisher:
  Iowa. Dept. of Transportation
• Abstract:
  The Iowa Pore Index (IPI) test is a fast, non-destructive, inexpensive, and environmentally friendly test used by several ; Midwestern state departments of transportation to determine the volume ratio of macropores to micropores in a coarse rock ; aggregate. When combined with x-ray diffraction and x-ray fluorescence, this method has been shown to be effective in ; predicting the performance of aggregates in portland cement concrete. The test has the potential to replace mercury porosimetry ; and be integrated into any petrophysical laboratory. ; This research aimed to understand the geological factors (depositional environment, facies, grain and pore types, texture, and ; paragenesis) responsible for the results of the IPI test. Samples of various geologic ages were collected around Iowa to represent ; different combinations of accepted and rejected porosity and clay contents. The pore index of each sample was calibrated ; quantitatively via helium and mercury porosimetry and qualitatively via thin section petrography. ; The findings show that even the most homogeneous sources have at least three different rock types. Petrographic analysis showed ; that limestones with a sparite matrix, peloidal grains, and a low matrix-to-allochem ratio (i.e., grainy) are better for road ; construction than limestones with a micrite matrix, skeletal grains, and a high matrix-to-allochem ratio (i.e., muddy). Dolostones ; with fine to coarse grains, crystal-supported euhedral to subhedral rhombs, and porous intercrystalline areas are more desirable ; than dolostones with very fine grains and a tightly interlocking crystal mosaic in anhedral form. ; Several linear models were developed to relate IPI to helium porosity. Limestones with a helium porosity less than ~7% and ; dolostones with a helium porosity greater than ~13% were found to be desirable for use in road construction. The critical range of ; pore-throat size was found to be between 0.02 and 0.1 µm. Coarse aggregates with modal pore throat sizes above this range were ; found to be desirable for use in road construction
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/32887/dot_32887_DS1.pdf
• File Type:
  [PDF - 3.11 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:f270c0bbe19b0627f82e58ebed9086d85c70187afa9e087b3e98a7ebc54b1936c90dcfbcb10875bb634dbb617ea26de9f13d0a99da575bb5f57d6ad7dda8f0a5