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Investigating the rheological properties and compatibility behaviours of RET/PE and WR/CR/ SBS compound-modified bitumen

Journal Article (2023)
Author(s)

Shisong Ren (TU Delft - Pavement Engineering)

X Liu (TU Delft - Pavement Engineering)

Ruxin Jing (TU Delft - Pavement Engineering)

Yangming Gao (Liverpool John Moores University)

P. Lin (TU Delft - Pavement Engineering)

S.M.J.G. Erkens (TU Delft - Pavement Engineering)

Research Group
Pavement Engineering
Copyright
© 2023 S. Ren, X. Liu, R. Jing, Y. Gao, P. Lin, S. Erkens
DOI related publication
https://doi.org/10.1080/14680629.2023.2221347
More Info
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Publication Year
2023
Language
English
Copyright
© 2023 S. Ren, X. Liu, R. Jing, Y. Gao, P. Lin, S. Erkens
Research Group
Pavement Engineering
Issue number
4
Volume number
25
Pages (from-to)
653-677
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Abstract

Two types of elastomer/plastic compound-modified bitumen were developed by means of incorporating the reactive elastomeric terpolymer (RET) into the plastic (high-density polyethylene HDPE or recycled polyethylene RPE) modified bitumen and adding the wax residue (WR) into the bitumen/elastomer (crumb rubber CR or styrene–butadiene–styrene SBS) blends. The rheological properties, morphology microstructure and storage stability of these novel elastomer/plastic compound-modified binders were characterised. The results revealed that RET elastomer positively improved the high-temperature modulus, temperature insensitivity, rut resistant, elastic recovery and shear-resistance of HDPE- and RPE-modified bitumen. However, excessive RET dosage adversely influenced the cracking resistance of plastic-modified bitumen, and its optimum dosage was recommended as 1 wt%. Moreover, RET elastomer significantly strengthened the storage stability of HDPE and RPE-modified binders. The elasticity improvement effect of RET was attributed to the generated polymer network. On the other hand, adding WR limitedly deteriorated the rutting resistance and weakened the elastic recovery performance of elastomer (CR and SBS) modified bitumen. To ensure the low-temperature performance, the optimum level of WR was 2 wt%. Furthermore, the addition of WR promoted the compatibility and dispersion of CR and SBS modifiers in bitumen.