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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Updated: Sep 11, 2025

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A Study on the Characterization of Asphalt Plant Reclaimed Powder Using Fourier Transform Infrared Spectroscopy.

Hao Wu1, Daoan Yu2, Wentao Wang1

  • 1Shandong Provincial Road and Bridge Group Co., Ltd., Jinan 250014, China.

Materials (Basel, Switzerland)
|August 14, 2025
PubMed
Summary

This study introduces a rapid Fourier transform infrared spectroscopy (FTIR) method to evaluate asphalt plant reclaimed powder for road engineering. The new method accurately predicts acidity/alkalinity and cleanliness, improving recycling efficiency.

Keywords:
acidity/alkalinitycleanlinessinfrared spectroscopy (FTIR)reclaimed powder

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Area of Science:

  • Materials Science
  • Geotechnical Engineering
  • Analytical Chemistry

Background:

  • Asphalt plant reclaimed powder is a significant solid waste in road engineering.
  • Reusing this waste is crucial for environmental protection and resource conservation.
  • Traditional methods for evaluating reclaimed powder properties are inefficient and variable.

Purpose of the Study:

  • To develop a rapid and precise method for evaluating reclaimed powder properties.
  • To establish correlations between Fourier transform infrared spectroscopy (FTIR) data and key powder characteristics.
  • To enable high-value recycling of reclaimed powder in road engineering.

Main Methods:

  • Fourier transform infrared spectroscopy (FTIR) was used to analyze reclaimed powder samples.
  • Scanning electron microscopy (SEM), X-ray fluorescence spectroscopy (XRF), and X-ray diffraction (XRD) were employed for characterization.
  • A quantitative functional group index (Is) was proposed based on FTIR absorption peaks.

Main Results:

  • Reclaimed powder composition varies, including calcium carbonate, silicon oxide, iron oxide, aluminum oxide, and clay.
  • The proposed Is index, derived from FTIR, effectively correlates with acidity/alkalinity (R² = 0.89) and cleanliness (R² = 0.80 with methylene blue, R² = 0.96 with pull-off strength).
  • FTIR analysis successfully predicted key properties influencing reclaimed powder reuse.

Conclusions:

  • The developed FTIR-based method offers a rapid and precise alternative to traditional tests for evaluating reclaimed powder.
  • The quantitative functional group index (Is) demonstrates strong predictive power for acidity/alkalinity and cleanliness.
  • This method facilitates the efficient and high-value recycling of asphalt plant reclaimed powder in road engineering.