Performance and Microscopic Mechanism of Liquid Rubber Modifier/SBS Modified Asphalt
To study the modification mechanism of liquid rubber modifier/SBS modified asphalt,the liquid rubber modifier modified asphalt(LRM/MA)and the liquid rubber modifier/SBS modified asphalt(LRM/SBSMA)were respectively prepared by using the self-made liquid rubber modifier.The basic physical performance indicators of modified asphalt were tested with the macroscopic tests,i.e.,penetration,softening point,ductility,and elevated temperature rheological properties.The modification mechanism was analyzed by using micro technologies,i.e.,FTIR,scanning electron microscopy,fluorescence microscopy,and differential scanning calorimetry.The study result of basic physical properties indicates that the penetrations of LRM/MA and LRM/SBSMA decrease by 16.9%and 18.4%compared with SK-90#matrix asphalt.Meanwhile,the softening points increase by 21.1%and 42.3%.The ductility performances increase by 54.7%and 153.7%.The elevated temperature stability is significantly improved.The FTIR result indicates that a stable cementitious structure is formed among SK-90#matrix asphalt,rubber modifier modified and SBS modifier through physical blending and weak chemical reaction.The scanning electron microscopy result indicates that the SBS modifier promotes the adsorption and fusion of liquid rubber modifier in SK-90#matrix asphalt,which makes LRM/SBSMA modification effect better.The fluorescence microscopy result indicates that SK-90#matrix asphalt presents a single homogeneous continuous phase structure.LRM/MA presents an inhomogeneous continuous structure,and LRM/SBSMA presents a spatial network structure with microphase separation.The differential scanning calorimetry result indicates that for SK-90#matrix asphalt,after being modified with liquid rubber modifier and LRM/SBS,the endothermic peak area of differential scanning calorimetry curve decreases,the temperature sensitivity decreases,and the elevated temperature stability is effectively improved.
road engineeringperformance evaluationmicroscopic mechanismelevated temperature propertycomposite modified asphaltliquid rubber modifier
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