Real time laser scanning of aggregate materials in highway construction : a transportation pooled fund study.

Details

• Creators:
  Chesner, Warren H. ; McMillan, Nancy J.
• Corporate Creators:
  Chesner Engineering P.C. ; New Mexico State University
• Corporate Contributors:
  Kansas. Dept. of Transportation. Bureau of Research ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Lasers
  • Spectroscopy
  • Road construction
  • Laser induced breakdown spectroscopy
  • laser scanning
  • sample laser targeting system
  • aggregate quality
• Publication/ Report Number:
  FHWA-KS-16-13
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Kansas ; Oklahoma ; New York ; Ohio ; Pennsylvania
• Edition:
  Final report
• Corporate Publisher:
  Kansas. Dept. of Transportation
• Abstract:
  The quality and service life of the roadways that make up the highway transportation infrastructure are dependent upon ; the selection and use of high quality aggregate materials. Five state transportation agencies participated in this Transportation ; Pooled Fund (TPF) study, which was designed to demonstrate the use of laser scanning as a means to assess, in real-time, the ; quality of aggregate used in highway construction. Participating states included Kansas, New York, Ohio, Oklahoma, and ; Pennsylvania. The referenced technology is based on a process referred to as Laser Induced Breakdown Spectroscopy (LIBS). In this ; process, a high-powered laser pulse is used to excite atoms that make up the aggregate. This excitation results in the emission of ; light from a range of unique wavelengths (spectrum) that can be thought of as a “fingerprint” of the material. The development of a ; database of spectra or fingerprints of many aggregate materials with known engineering properties provides the basis for ; employing numerical techniques (models), similar to “fingerprint matching,” to identify the properties of unknown aggregate ; material. Scanning data generated in this demonstration show that the technology can differentiate between approved and ; unapproved aggregate sources. It has the potential to quantify specific test parameters such as acid insoluble residue (AIR), MicroDeval ; loss, and specific gravity, as well as to identify the presence of deleterious materials, such as reactive chert, ASR and ACR, ; and D-cracking susceptible aggregate. It can be used to identify the aggregate source or sources of a stockpile of unknown ; material(s). A total of 113 aggregates supplied by the participating states were laser-scanned using a field prototype system located in ; a field materials testing laboratory in South Bethlehem, New York. The analyses in this demonstration focused on specific gravity ; (bulk and SSD) and absorption, D-cracking, acid insoluble residue, Micro-Deval, and Los Angeles (LA) Abrasion Loss. The ; results show that laser scanning can successfully predict the properties of aggregate, opening up a whole new way of analyzing ; aggregate materials. Based on the results presented, recommended future work is outlined, some of which has been initiated and ; presented herein to refine the scanning and modeling process to enhance data quality.
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• Format:
  PDF
• Funding:
  C1964
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31649/dot_31649_DS1.pdf
• File Type:
  [PDF - 1.73 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:9c3f3db306ff3ed285a78f13e4d3385c3d80a0cf65c72180b07446cae0d668b2