摘要
为了研究聚氨酯(TPU)/纳米二氧化钛(Nano-TiO_(2))复合改性沥青的流变性能及微观机制。通过3个指标研究改性沥青的基本性能,采用动态剪切流变试验(DSR)和弯曲梁流变试验(BBR)分析改性沥青的高低温流变性能,利用傅里叶红外光谱试验(FTIR)分析复合改性沥青的微观机制。研究结果表明,TPU/Nano-TiO_(2)改性沥青具有更高的低温抗裂性能和高温抗变形能力,当TPU添加量为4%,Nano-TiO_(2)添加量为1%时,复合改性沥青具有最佳的高低温流变性,其中,TPU在改善沥青低温抗裂性能中起到了主导作用,Nano-TiO_(2)在改善高温抗永久变形能力中起到主导作用;聚氨酯中的异氰酸酯与沥青质中的芳香族化合物发生了加成反应,Nano-TiO_(2)在复合物中起到物理交联作用。
In order to study the rheological properties and micro-mechanism of polyurethane(TPU)/Nano-TiO_(2) composite modified asphalt.The basic performance of modified asphalt was studied through three major indicators.The dynamic shear rheological test(DSR)and the curved beam rheological test(BBR)were used to analyze the high and low temperature rheological properties of the modified asphalt.The Fourier Infrared Spectroscopy(FTIR)was used to reveal the microscopic mechanism of the composite modified asphalt.The research results found that,TPU/Nano-TiO_(2) modified asphalt had higher low-temperature crack resistance and high-temperature deformation resistance.When the addition amount of TPU was 4%and the addition amount of Nano-TiO_(2) was 1%,the composite modified asphalt had the best high and low temperature rheology.Among them,TPU played a leading role in improving the low-temperature crack resistance of asphalt,and Nano-TiO_(2) played a leading role in improving the high-temperature resistance to permanent deformation.The isocyanate in the polyurethane and the aromatic compound in the asphaltene undergo an addition reaction,while the Nano-TiO_(2) only exerted a physical cross-linking effect in the composite.
作者
姬海东
何东坡
JI Haidong;HE Dongpo(College of Civil Engineering,Northeast Forestry University,Harbin,Heilongjiang 150036,China)
出处
《塑料》
CAS
CSCD
北大核心
2022年第1期25-29,77,共6页
Plastics
关键词
聚氨酯
纳米二氧化钛
低温抗裂性
高温抗变形
微观性能
polyurethane
nanometer titania
low-temperature crack resistance
high-temperature resistance
micro-mechanism
作者简介
姬海东(1997-),男,在读硕士研究生,主要从事新型道路材料等方面的研究;通信作者:何东坡(1962-),男,硕士,教授,主要从事道路病害防治及道路环境保护等方面的研究。E-mail:hdp@nefu.edu.cn。
