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为探究基于动物排泄物的生物结合料对石油沥青老化过程中流变性能的影响,采用无氧环境下高温加压的热处理方法(380℃、10.3 MPa)从猪粪中提炼生物质重油,并制备生物沥青共混物,通过布氏旋转粘度(RV)试验、动态剪切流变(DSR)试验及弯曲梁流变(BBR)试验进行不同老化条件下的流变性能综合评价,并利用傅里叶红外光谱(FTIR)技术,对比分析了生物改性前后沥青老化过程中的化学组分变化。结果表明:老化前后的生物改性沥青的粘度均低于其对应石油沥青;各老化条件下,生物改性后的沥青相位角δ和复数剪切模量G*均减小,表明生物重油可提高沥青结合料的弹性,而降低其刚性;生物结合料能有效提高沥青的抗温缩开裂性能;此外,掺入生物结合料后沥青的化学组分并无明显变化,但其抗老化性能有所增强。
In order to investigate the effect of bio-binders based on animal excrement on the rheological properties of petroleum asphalt during aging, bio-heavy oil was extracted from pig manure by heat-treatment under high temperature and pressure (380 ℃, 10.3 MPa) in anaerobic environment and prepared Bio-asphalt blends, the comprehensive evaluation of rheological properties under different aging conditions was carried out by means of Brookfield rotational viscosity (RV) test, dynamic shear rheological (DSR) test and bending beam rheological (BBR) Leaf Infrared Spectroscopy (FTIR) technique was used to analyze the changes of chemical composition in the asphalt aging process before and after biological modification. The results show that the viscosity of the bio-modified asphalt before and after aging is lower than that of the corresponding petroleum pitch. Under all aging conditions, the bi-modified pitch phase angle δ and the complex shear modulus G * decrease, Improve the flexibility of asphalt binder, and reduce its rigidity; biological binder can effectively improve the resistance to temperature shrinkage cracking of asphalt; In addition, the incorporation of bio-binder asphalt chemical composition and no significant change, but its anti-aging properties Enhanced.