Automated Laser Spectrographic Pattern Matching for Aggregate Identification. Final Report for Highway IDEA Project 50.

摘要

To ensure an uninterrupted supply of high quality aggregates for use in Portland cement, asphalt cement and unbound stone products, transportation agencies include test methods and criteria in their standard specifications to define the physical, chemical and mechanical property criteria that aggregates must exhibit for each specific end use. Most agencies rely on laboratory based test methods compiled by organizations such as the American Association of State and Highway Transportation Officials (AASHTO) and the American Society of Testing Materials (ASTM) to describe the appropriate test methods and criteria. Some of the more common aggregate properties supporting these specifications include gradation, specific gravity, absorption, organic content, plasticity, abrasion resistance, soundness, freeze thaw resistance, friable particles, insoluble residue, and aggregate reactivity. Almost all existing test methods and their corresponding criteria are empirical in nature and are based on studies undertaken over the years that have defined correlations between the results of laboratory test data and field experience.