The feasibility of short-wave infrared spectrometry in assessing water-to-cement ratio and density of hardened concrete

TitleThe feasibility of short-wave infrared spectrometry in assessing water-to-cement ratio and density of hardened concrete
Publication TypeJournal Article
Year of Publication2018
AuthorsZahiri, Z., D. Laefer, and A. Gowen
JournalConstruction and Building Materials
Volume185
Start Page661
Date Published07/2018
Abstract

This paper describes the feasibility of using short-wave infrared (SWIR) spectrometry to classify concretes
by their water-to-cement (w/c) ratios and predict their density. Concrete spectra of three w/c
ratios (50%, 65%, 80%) were studied in the 1300–2200 nm range. A Partial Least Square Discriminant
Analysis model was developed from the spectra of 36 samples, resulting in an 89% correct classification
for the 18 validation samples, thereby demonstrating that SWIR spectrometry can detect differences in
initial w/c ratios for hardened concretes. Additionally, differences in density and compressive strength
as a function of the w/c ratio could be indirectly estimated through SWIR spectrometry.

Research area: