Effect of softening additives on the moisture susceptibility of recycled bituminous materials using chemical-mechanical-imaging methods

Hamzeh F. Haghshenas, Yong-Rak Kim, Martha D Morton, Thomas Smith, Mahdieh Khedmati, Davoud F. Haghshenas

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This study examined the effects of softening additives on the moisture susceptibility of recycled bituminous materials using chemical, mechanical, and imaging laboratory investigation methods. Two chemically different rejuvenators, one petroleum-tech (aromatic extracts) and one green-tech (tall oil), and an amine-based warm mix additive were selected as such softening additives. For chemical investigation, the two rejuvenators were examined using saturates-aromatics-resins-asphaltenes (SARA) analysis, Fourier-transform infrared (FT-IR) spectroscopy, thermogravimetric analysis coupled with FT-IR (TGA-IR), and nuclear magnetic resonance (NMR). Mechanically, a semicircular bending (SCB) fracture test was conducted to evaluate the moisture damage resistance of the recycled bituminous mixtures treated with the different rejuvenators and the warm mix additive. Laser scanning microscopy (LSM) was also used to acquire noncontact microscale topographical images to evaluate the effect of lower temperatures on aggregate-matrix interaction in the production of mixtures with the warm mix additive. The test-analysis results were then investigated to identify relationships between different features (i.e., chemical, mechanical, and topographical) of the mixtures associated with the different rejuvenators and the warm mix additive. Although additional data and investigations are still necessary to reach more definite conclusions, it appears that specific chemical functional groups in the rejuvenating agents are associated with the rejuvenated mixtures' moisture sensitivity, and the lower production temperatures used in warm mixtures may lead to a somewhat more porous region between the aggregates and the matrix phase of recycled-rejuvenated bituminous mixtures.

Original languageEnglish (US)
Article number04018207
JournalJournal of Materials in Civil Engineering
Volume30
Issue number9
DOIs
StatePublished - Sep 1 2018

Fingerprint

Bituminous materials
Moisture
Imaging techniques
Low temperature production
Tall oil
Asphaltenes
Petroleum
Functional groups
Amines
Fourier transform infrared spectroscopy
Thermogravimetric analysis
Fourier transforms
Microscopic examination
Resins
Crude oil
Nuclear magnetic resonance
Infrared radiation
Scanning
Lasers

Keywords

  • Moisture susceptibility
  • Recycled bituminous mixture
  • Rejuvenator
  • Warm mix

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials

Cite this

Effect of softening additives on the moisture susceptibility of recycled bituminous materials using chemical-mechanical-imaging methods. / Haghshenas, Hamzeh F.; Kim, Yong-Rak; Morton, Martha D; Smith, Thomas; Khedmati, Mahdieh; Haghshenas, Davoud F.

In: Journal of Materials in Civil Engineering, Vol. 30, No. 9, 04018207, 01.09.2018.

Research output: Contribution to journalArticle

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