Storage stability of wet asphalt rubber： A comprehensive review

doi:10.19491/j.issn.1001-9278.2025.08.012

Abstract

Abstract:

As an eco⁃friendly pavement material， wet⁃process asphalt rubber （WPAR） aligns with the "Reduce， Reuse， Recycle" （3R） environmental strategy. This paper systematically reviewed stability challenges in WPAR during high⁃temperature storage， particularly those caused by density differences between asphalt and rubber particles. First， the preparation process of rubber asphalt was elaborated， emphasizing its environmental benefits through waste tire recycling and life⁃cycle advantages. Next， the performance characteristics and storage stability of WPAR were compared with conventional asphalt in road construction applications. The review then analyzes stability enhancement strategies through production process optimization and improved storage conditions， proposing technical solutions for industry implementation. Finally， current research gaps and future opportunities were identified， suggesting promising directions for WPAR development within the 3R framework. This work provides both theoretical guidance and practical references for sustainable pavement material research while offering novel approaches for environmental protection in transportation infrastructure.

Key words: wet asphalt rubber, storage stability, pavement performance, process optimization, environmental impact

CLC Number:

TQ320.7

SHANG Yunlong, WANG Donghao, REN Zhibin. Storage stability of wet asphalt rubber： A comprehensive review[J]. China Plastics, 2025, 39(8): 75-82.

Figures/Tables 14

Fig.1. Morphological characteristics of 40 mesh rubber powder［14］

Fig.2. Horizontal high⁃speed shearing equipment［16］

Fig.3. Development process of asphalt rubber performance［20］

Fig.4. Molecular model of rubber⁃asphalt interaction［21］

Fig.5. Storage stability test method of EN 13399：2010 standard［25］

方法编号	测试时间/h	测试温度/℃	规范、标准或文献
1	48	163	ASTM D5892
2	72	180	EN 13399：2010
3	12	150~180	［26］
4	24	177~190	［27］
5	120	163	［28］

Tab.1. Test method for storage stability

Fig.6. Structure of the montmorillonite nanoclay［29］

Fig.7. Schematic diagram of improvement principle of the nano⁃montmorillonite［14］

Fig.8. Laboratory preparation process of rubber asphalt modified by heavy bio oil［42］

Fig.9. Reactions of crumb rubber in bio⁃modified rubberized asphalt［44］

Fig.10. Effect of storage time on phase separation［45］

样品编号	样品描述	比重	XRD d₀₀₁/nm
A	纯Na⁺蒙拓土	1.8	1.3
B	羟基有机铵改性蒙拓土	1.8	3.0
C	双烷基铵改性蒙拓土	1.7	3.7

Table 2. Montmorillonite materials commonly used for modifying asphalt［29］

Fig.11. Effect of montmorillonite materials on the improvement of storage stability［23］

Fig.12. Non⁃recoverable creep compliance value of several binders under different condition［49］

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