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原文传递 Real Time Laser Scanning of Aggregate Materials in Highway Construction, Technical Summary

题名：	Real Time Laser Scanning of Aggregate Materials in Highway Construction, Technical Summary
作者：	Chesner, W. H.; McMillan, N. J.
关键词：	Laser induced breakdown spectroscopy##Laser scanning##Sample Laser Targeting System##Aggregate quality##Highway construction##Transportation agencies##
摘要：	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), Micro-Deval 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).
总页数：	2
报告类型：	科技报告