Optimisation of the preparation procedure of crumb rubber modified bitumen with wax-based additives

Haopeng Wang; Gordon D. Airey; Zhen Leng; Guoyang Lu

doi:10.1080/14680629.2023.2191724

Optimisation of the preparation procedure of crumb rubber modified bitumen with wax-based additives

Haopeng Wang^*, Gordon D. Airey, Zhen Leng, Guoyang Lu

^*Corresponding author for this work

Department of Architecture and Civil Engineering

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

8 Citations (Scopus)

58 Downloads (CityUHK Scholars)

Abstract

Wax-based additives can be added to crumb rubber modified bitumen (CRMB) at different stages to enhance the workability. This study aims to optimize the preparation procedure by investigating the effects of the preparation procedure on the rheological properties of CRMB containing wax-based additives and the interaction mechanism. Rubber swelling tests under various conditions were conducted to examine the effects of temperature and additives on the interaction process. Rheological and thermal characterizations were performed on the CRMB binder and its liquid phase. Results show that reducing the bitumen viscosity by adding wax-based additives can promote the bitumen-rubber interaction and achieve similar swelling results at a lower temperature. However, a significant proportion of wax-based additives were found to penetrate rubber particles for the warm-produced CRMB. Although warm-produced CRMB may save energies compared to hot-produced CRMB, it is not recommended to replace the traditional hot-produced CRMB procedure. © 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

Original language	English
Pages (from-to)	16-27
Number of pages	12
Journal	Road Materials and Pavement Design
Volume	25
Issue number	S1
Online published	24 Mar 2023
DOIs	https://doi.org/10.1080/14680629.2023.2191724
Publication status	Published - 2024

Funding

The authors would like to acknowledge the financial support from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 101024139 and the Research Grants Council of the Hong Kong Special Administrative Region, China (RGC Project No. 15221921).

Research Keywords

Crumb rubber modified bitumen
differential scanning calorimetry
preparation procedure
rheology
rubber swelling
wax additive

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This full text is made available under CC-BY-NC-ND 4.0. https://creativecommons.org/licenses/by-nc-nd/4.0/

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title = "Optimisation of the preparation procedure of crumb rubber modified bitumen with wax-based additives",

abstract = "Wax-based additives can be added to crumb rubber modified bitumen (CRMB) at different stages to enhance the workability. This study aims to optimize the preparation procedure by investigating the effects of the preparation procedure on the rheological properties of CRMB containing wax-based additives and the interaction mechanism. Rubber swelling tests under various conditions were conducted to examine the effects of temperature and additives on the interaction process. Rheological and thermal characterizations were performed on the CRMB binder and its liquid phase. Results show that reducing the bitumen viscosity by adding wax-based additives can promote the bitumen-rubber interaction and achieve similar swelling results at a lower temperature. However, a significant proportion of wax-based additives were found to penetrate rubber particles for the warm-produced CRMB. Although warm-produced CRMB may save energies compared to hot-produced CRMB, it is not recommended to replace the traditional hot-produced CRMB procedure. {\textcopyright} 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.",

keywords = "Crumb rubber modified bitumen, differential scanning calorimetry, preparation procedure, rheology, rubber swelling, wax additive",

author = "Haopeng Wang and Airey, {Gordon D.} and Zhen Leng and Guoyang Lu",

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doi = "10.1080/14680629.2023.2191724",

language = "English",

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AU - Wang, Haopeng

AU - Airey, Gordon D.

AU - Leng, Zhen

AU - Lu, Guoyang

PY - 2024

Y1 - 2024

N2 - Wax-based additives can be added to crumb rubber modified bitumen (CRMB) at different stages to enhance the workability. This study aims to optimize the preparation procedure by investigating the effects of the preparation procedure on the rheological properties of CRMB containing wax-based additives and the interaction mechanism. Rubber swelling tests under various conditions were conducted to examine the effects of temperature and additives on the interaction process. Rheological and thermal characterizations were performed on the CRMB binder and its liquid phase. Results show that reducing the bitumen viscosity by adding wax-based additives can promote the bitumen-rubber interaction and achieve similar swelling results at a lower temperature. However, a significant proportion of wax-based additives were found to penetrate rubber particles for the warm-produced CRMB. Although warm-produced CRMB may save energies compared to hot-produced CRMB, it is not recommended to replace the traditional hot-produced CRMB procedure. © 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

AB - Wax-based additives can be added to crumb rubber modified bitumen (CRMB) at different stages to enhance the workability. This study aims to optimize the preparation procedure by investigating the effects of the preparation procedure on the rheological properties of CRMB containing wax-based additives and the interaction mechanism. Rubber swelling tests under various conditions were conducted to examine the effects of temperature and additives on the interaction process. Rheological and thermal characterizations were performed on the CRMB binder and its liquid phase. Results show that reducing the bitumen viscosity by adding wax-based additives can promote the bitumen-rubber interaction and achieve similar swelling results at a lower temperature. However, a significant proportion of wax-based additives were found to penetrate rubber particles for the warm-produced CRMB. Although warm-produced CRMB may save energies compared to hot-produced CRMB, it is not recommended to replace the traditional hot-produced CRMB procedure. © 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

KW - Crumb rubber modified bitumen

KW - differential scanning calorimetry

KW - preparation procedure

KW - rheology

KW - rubber swelling

KW - wax additive

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M3 - RGC 21 - Publication in refereed journal

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JO - Road Materials and Pavement Design

JF - Road Materials and Pavement Design

IS - S1

ER -

Optimisation of the preparation procedure of crumb rubber modified bitumen with wax-based additives

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GRF: Multiscale Chemo-physico-mechanical Characterization on the Modification Mechanism of Polyurethane Modified Porous Asphalt towards Enhanced Moisture Damage Resistance

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Optimisation of the preparation procedure of crumb rubber modified bitumen with wax-based additives

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Research Keywords

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GRF: Multiscale Chemo-physico-mechanical Characterization on the Modification Mechanism of Polyurethane Modified Porous Asphalt towards Enhanced Moisture Damage Resistance

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