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Updated: Apr 15, 2026

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
Published on: August 25, 2016
Influence of Aldehyde-Based Modifiers on Rubber Asphalt: Properties, Deodorization Effect, and Mechanistic Analysis
Honggang Zhang1,2, Jiechao Lei1,2, Hui Huang1
1Guangxi Key Laboratory of Road Structure and Materials, Guangxi Transportation Science and Technology Group Co., Ltd., Nanning 530007, China.
Adding α-Amyl cinnamic aldehyde (ACA) to crumb rubber modified asphalt (CRMA) reduces harmful emissions and improves material properties. Optimal performance and reduced volatile organic compounds (VOCs) and H2S gas were observed with 1.0% ACA.
Area of Science:
- Materials Science
- Environmental Engineering
- Chemical Engineering
Background:
- Crumb rubber modified asphalt (CRMA) offers sustainable tire recycling and improved pavement performance.
- High-temperature construction of CRMA releases harmful gases, posing environmental and health risks.
- Deodorization is crucial for the safe and widespread application of CRMA.
Purpose of the Study:
- To investigate the deodorization effect of α-Amyl cinnamic aldehyde (ACA) on CRMA.
- To evaluate the impact of ACA on CRMA's physical and chemical properties.
- To explore the mechanism of ACA's deodorization in CRMA.
Main Methods:
- Preparation of deodorized CRMA (DCRMA) with varying ACA concentrations (0.5%-2.0%).
- Evaluation of CRMA properties using softening point, ductility, penetration, viscosity, and segregation tests.
- Quantitative analysis of asphalt fumes (VOCs, H2S, solid particles) using a developed monitoring device.
- Microscopic analysis using fluorescence microscopy (FM) and Fourier transform infrared spectroscopy (FTIR).
Main Results:
- ACA increased CRMA softening point and viscosity, while decreasing penetration and ductility.
- Optimal storage stability was achieved with 1.0% ACA addition.
- Increasing ACA content significantly reduced VOCs, H2S gas, and solid particle concentrations in fumes.
- FM indicated ACA promoted crumb rubber swelling in asphalt up to 1.0% addition.
- FTIR results showed ACA decreased characteristic peak intensity in CRMA.
Conclusions:
- ACA effectively reduces harmful emissions from CRMA during high-temperature construction.
- ACA addition optimizes CRMA properties and storage stability, particularly at 1.0%.
- This study provides valuable data for the environmentally friendly application of CRMA.
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