生物炭改性沥青热氧老化性能研究

Study on thermal oxygen aging performance of biochar modified asphalt

为了研究生物炭对基质沥青老化性能的影响,按不同质量比(3%、6%、9%和12%)的生物炭掺入沥青,制备生物炭改性沥青。通过旋转薄膜烘箱和压力老化仪进行老化模拟,采用针入度、软化点、黏度试验测试改性沥青不同老化前后基本性能,采用动态剪切流变试验、低温弯曲梁流变试验测试改性沥青不同老化前后流变性能,并通过傅里叶红外光谱(FT-IR)进行微观机理分析。结果表明:生物炭对沥青改性是物理作用,生物炭掺入沥青能够较好地提高抗老化性能,生物炭改性沥青短期热氧老化作用效果优于长期热氧老化,当生物炭掺量控制在9%~12%时对沥青的抗老化性能影响显著。

In order to study the effect of biochar on the aging property of matrix asphalt,biochar modified asphalt was prepared by adding different mass ratios(3%,6%,9%and 12%)of biochar into asphalt.The aging simulation was carried out by rotating film oven and pressure aging apparatus,and the basic properties of modified asphalt before and after different aging were tested by needle penetration,softening point and viscosity tests.The.rheological properties of modified asphalt before and after different aging were tested by dynamic shear rheological test and low temperature bending beam rheological test.The microscopic mechanism was analyzed by Fourier infrared spectroscopy(FT-IR).The results showed that biochar modification of asphalt was a physical effect and biochar added into asphalt could effectively improve the anti-aging performance.The short-term thermal oxygen aging effect of biochar modified asphalt was better than that of long-term thermal oxygen aging.When the content of biochar was controlled at 9%to 12%,the anti-aging performance of asphalt was significantly affected.