Petroleum pitches of different types and grades have been prepared from aromatic-rich residues produced in various petroleum refining and petrochemical processes. Generally, petroleum pitches having high softening point (> 100°C) have widespread applications for making industrial and advanced carbon materials such as carbon fibers, carbon anodes, graphite electrodes, carbon foam, Li-ion batteries etc. On the other hand, petroleum pitches having low softening point (< 50°C) have limited applications due to their low carbon yield and low viscosity. In this paper, the new use of low softening point pitches (LSPP) ranging from 45-78°C as a modifier to make bitumen with improved rheological properties have been explored. Three low softening point petroleum pitches are prepared by giving thermal treatment to aromatic rich petroleum feed stocks at 390°C for varied time period under inert atmosphere and characterized as per ASTM test procedures. One of the petroleum pitches namely CSO-390-3 is used for making modified bitumen. The rheological studies show that addition of low softening point pitch (LSPP) to base bitumen improves its viscoelastic behavior. The study reveal that the petroleum pitches having a softening point (45.5°C) found to be effective to improve phase angle as well as oscillation stress and shear modulus (G*/Sinδ) of base bitumen.

中文翻译：

---

石油沥青的制备及其在改善流变性能的沥青中的应用

已经从在各种石油精炼和石化工艺中产生的富含芳烃的残渣制备了不同类型和等级的石油沥青。通常，具有高软化点（> 100°C）的石油沥青在制造工业和高级碳材料（例如碳纤维，碳阳极，石墨电极，碳泡沫，锂离子电池等）方面具有广泛的应用。具有低软化点（<50°C）的沥青由于碳收率低和粘度低而受到限制。本文研究了在45-78°C范围内将低软化点沥青（LSPP）用作改性剂以使沥青具有改善的流变性能的新用途。通过在惰性气氛下于390°C的条件下对富芳族石油原料进行热处理，制备三种低软化点石油沥青，并按照ASTM测试程序进行表征。一种石油沥青，即CSO-390-3，用于制备改性沥青。流变学研究表明，向基沥青中添加低软化点沥青（LSPP）可改善其粘弹性。研究表明，发现具有软化点（45.5°C）的石油沥青可有效改善基础沥青的相角以及振荡应力和剪切模量（G * /Sinδ）。流变学研究表明，向基沥青中添加低软化点沥青（LSPP）可改善其粘弹性。研究表明，发现具有软化点（45.5°C）的石油沥青可有效改善基础沥青的相角以及振荡应力和剪切模量（G * /Sinδ）。流变学研究表明，向基沥青中添加低软化点沥青（LSPP）可改善其粘弹性。研究表明，发现具有软化点（45.5°C）的石油沥青可有效改善基础沥青的相角以及振荡应力和剪切模量（G * /Sinδ）。