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A Study on Physical and Rheological Properties of Rubberized Bitumen Modified by Different Methods

机译：不同方法改性的橡胶沥青的物理流变性能研究

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摘要

Crumb rubber (CR) manufactured from waste tires used in bitumen could improve bitumen performance and reduce environmental pollution. In this work, three different modification methods, pretreatment of the CR particles (microwave activation), warm mix additive (Sasobit), and trans-polyoctenamer (TOR) were used to improve the compatibility of CR with bitumen. Moreover, two other specimens, Sasobit and microwave activated and TOR and microwave activation were fabricated, and their performance was investigated. The softening point, elastic recovery, force ductility, rotational viscosity, temperature sweep, frequency sweep, and multiple stress creep and recovery (MSCR) tests were measured to evaluate the physical and rheological properties of rubberized bitumen. The results showed that TOR improved the physical properties of rubberized bitumen significantly but had a negative effect on the viscosity. Sasobit decreased the viscosity of rubberized bitumen considerably and improved the physical properties of rubberized bitumen moderately. Microwave treatment on CR had a negative effect on the high temperature performance and elastic recoverability of rubberized bitumen, however, attributing to the degradation and devulcanization effect of microwave on CR, the viscosity of rubberized bitumen was improved. From the results of composite modification, the influence of TOR on the performance of rubberized bitumen was more obvious than that of the microwave activation treatment. Moreover, the influence of Sasobit on its performance was less than that of the microwave activation treatment.
机译：由用于沥青的废轮胎制造的碎胶（CR）可以改善沥青性能并减少环境污染。在这项工作中，使用三种不同的改性方法，CR颗粒的预处理（微波活化），热混合添加剂（Sasobit）和反式聚辛烯单体（TOR）来改善CR与沥青的相容性。此外，还制造了另外两个样品，即索氏和微波活化的样品以及TOR和微波活化的样品，并对其性能进行了研究。测量了软化点，弹性恢复，力延展性，旋转粘度，温度扫描，频率扫描和多次应力蠕变和恢复（MSCR）测试，以评估橡胶沥青的物理和流变性能。结果表明，TOR显着改善了橡胶沥青的物理性能，但对粘度有负面影响。 Sasobit大大降低了橡胶沥青的粘度，并适度改善了橡胶沥青的物理性能。微波处理CR对橡胶沥青的高温性能和弹性回复率有负面影响，但由于微波对CR的降解和脱硫作用，橡胶沥青的粘度得到了改善。从复合改性的结果来看，TOR对橡胶沥青的性能的影响比微波活化处理更明显。而且，Sasobit对其性能的影响小于微波活化处理的影响。

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