Year: 2015
Type: dissertation
Abstract: The strength of concrete and asphalt is provided by the aggregate stone within it, and as such maintaining a high standard for these materials is crucial in ensuring that these materials meet their projected design lives. One key factor to consider for an aggregate's long-term strength is its mineralogy, which can affect the strength and long-term performance of these materials. Conventional chemical testing techniques and petrographic examination methods presently exist which can be used to identify and/or quantify problematic minerals, however these tests are typically costly, time consuming, and/or require significant sample preparation and a controlled lab environment. The purpose of this study is to develop a portable, reliable system to determine traits of aggregate stone in the field and compare the results to New Jersey state standards as a means of quality control. This research presently focuses on quantifying the chemical composition and mineralogy of aggregates, with focus on minerals such as mica and limestone which can cause rapid degradation of aggregate stone in asphalt and concrete. Chemical composition testing is performed via Laser-Induced Breakdown Spectroscopy (LIBS), which involves firing a laser pulse at a sample and predicting its composition based on the spectrum of light emitted by the resulting plasma. Predictive models are generated via Partial Least Squares Regression Analysis.
Author: Andrew M. Branin
Institution: Rowan University
Language: English
Subfield: Spectroscopy
Field: Chemistry
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W956561231