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Temperature effect of asphalt production on the thermo-chemical properties of Kraft lignin

J. Waldo Marquez, Valentina Fuentes, Eduardo J. Rueda, Alain Tundidor-Camba, Néstor Escalona, Jose Norambuena-Contreras Orcid Logo, Alvaro González

International Journal of Pavement Engineering, Volume: 25, Issue: 1

Swansea University Author: Jose Norambuena-Contreras Orcid Logo

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Abstract

Global warming has triggered a series of strategies and efforts to reduce greenhouse gas emissions and increase the reuse and recycling into asphalt pavements. One of these, is the reduction of production temperatures of asphalt mixtures, and the other is using sustainable antioxidants, such as Kraf...

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Published in: International Journal of Pavement Engineering
ISSN: 1029-8436 1477-268X
Published: Informa UK Limited 2024
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa68092
Abstract: Global warming has triggered a series of strategies and efforts to reduce greenhouse gas emissions and increase the reuse and recycling into asphalt pavements. One of these, is the reduction of production temperatures of asphalt mixtures, and the other is using sustainable antioxidants, such as Kraft lignin, with high phenolic content. Kraft lignin is usually mixed at high temperatures without considering the effect of temperature on its antioxidant properties. This research aimed to study the impact of the production temperatures of asphalt mixtures on the thermo-chemical properties of Kraft lignin and its antioxidant capacity. To evaluate these properties, thermogravimetry, infrared spectroscopy, and DPPH tests were done. To validate the results, bitumen-lignin blends were prepared considering representative temperatures for Hot-Mix-Asphalt (HMA), 160°C, and for Warm-Mix-Asphalt (WMA), 135°C. Bitumen-lignin blends were prepared considering 0% and 20% Kraft lignin by total weight bitumen. The blended samples, unaged and aged. were evaluated considering mechanical, rheological, and chemical properties. The main conclusion of the study demonstrated that although Kraft lignin can be used in HMA, using it in mixtures with lower temperatures conserve its properties. WMA production temperatures preserve Kraft lignin's chemical properties, increasing the durability and resilience of bitumen throughout its service life.
Keywords: Kraft lignin; bitumen; asphalt mixture; thermogravimetric analysis; DPPH; FTIR analysis
College: Faculty of Science and Engineering
Funders: This work was supported by the National Research and Development Agency (ANID) through the Research Project FONDECYT Regular 1211009: Lignin-based recycled asphalt pavements: from nano-scale approach to large-scale application.
Issue: 1