Emulsified asphalt is the primary material for preventive maintenance and cold-mix paving,but its low cohesive strength and poor mechanical properties limit its wide application,even with polymer modification.In this study,Styrene-Butadiene Rubber(SBR)emulsified asphalt was modified with nano-cellulose materials,namely nano paper-cellulose(NPC)and wood-derived nano-cellulose(WDC),to improve its properties.A novel preparation method of nano-cellulose solution was developed,including blending,ultrasonic stirring,and centrifugal treatment.Four types of nano-cellulose solution(0.5％NPC,0.5％,1.0％,and 1.5％WDC by weight of water)were selected.The microscopy analysis indicated that 0.5％WDC emulsion had a smaller particle size than 1.5％WDC emulsion.The rheology test indicated that WDC modified residue improved rutting resistance with the increased solution dosage due to the cross-linking effect,but its creep-and-recovery performance was worse than that of SBR emulsion residue.The NPC modified binder had a higher rutting factor than WDC modified binder at the same dosage after short-term aging.In addition,1.0％WDC could be regarded as the optimal dosage in terms of fatigue and low-temperature performance.Furthermore,Fourier Transform Infrared Spectroscopy(FTIR)results showed that 0.5％NPC modified residue performed better in long-term aging resistance compared with 0.5％WDC modified asphalt.

Yunge WEI;Jiayu WANG;Ruoyu LI;Ling XU;Feipeng XIAO

Key Laboratory of Road and Traffic Engineering of Ministry of Education,Tongji University,Shanghai 200092,China

结构与土木工程前沿

[1]Yunge WEI;Jiayu WANG;Ruoyu LI;Ling XU;Feipeng XIAO-.Laboratory investigation of emulsified asphalt binder modified with wood-derived nano-cellulose and nano paper-cellulose)[J].结构与土木工程前沿,2022(11):1474-1485

Emulsified,rutting

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