This paper examines the merits of using microbially desulfurized rubber to enhance theperformance ofbituminous pavements and promote recycling of scrap tires. To prepare microbially desulfurized rubber, we incubated crumb rubber obtained from waste tiresin medium with microbes from waste activated sludge. The concentration of sulfate was monitored during the treatment process and desulfurization was estimated to be about34%.Microbially desulfurized crumb rubber (MDR) was then added to bitumen to produce rubberized bitumen. Performance of the rubberized bitumen was compared with those of conventional crumb rubber modified (CRM) bitumen. To do so, Fourier transform infrared spectroscopy (FTIR), inverse gas chromatography (IGC), and rheometry were utilized. Chemical analysis of rubber particles after desulfurization showed a significant reduction of the peak at 500-540 cm⁻¹; this was attributed to the breakage of disulfide bonds after microbial desulfurization. Measurement of surface energy showed that the acid-base component of surface energy increased three times (increasing from 1.85mJ/m² to 5.55mJ/m²) after desulfurization. Such enhancement could lead to increased interactions between rubber and bitumen reducing their separation. This was evidenced ina68% reduction inseparation indexin bitumencontaining microbially-treated (desulfurized) rubber compared to bitumen havingnon-treated rubber. In addition, study results showed a 6% increase in elastic recovery,a 27% increase in resistance to moisture diffusion,a 12.5% decrease in viscosity,a 10% increase in stiffness, and a 5% increase in stress relaxation capacity compared to bitumen's having non-treated rubber. The outcome of the study promotes resource conservation by offering a simultaneous solution for recycling of scrap tire via a low-cost bio-inspired approach while enhancing pavement performance.

本文探讨了使用微生物脱硫的橡胶来增强沥青路面的性能并促进废旧轮胎的回收利用的优点。为了制备微生物脱硫的橡胶，我们将废轮胎培养基中的碎屑橡胶与废活性污泥中的微生物进行了温育。在处理过程中监测硫酸盐的浓度，估计脱硫约为34％。然后将微生物脱硫的粒状生胶（MDR）加入沥青中以生产橡胶化的沥青。将涂橡胶的沥青的性能与常规的碎橡胶改性（CRM）沥青的性能进行了比较。为此，利用了傅里叶变换红外光谱（FTIR），反相气相色谱（IGC）和流变法。^-1 ; 这归因于微生物脱硫后二硫键的断裂。表面能的测量表明，表面能的酸碱成分增加了三倍（从1.85mJ / m ²增加到5.55mJ / m ²）脱硫后。这种增强作用可能导致橡胶和沥青之间的相互作用增加，从而减少其分离。这证明了与未经处理的橡胶的沥青相比，含微生物处理的（脱硫的）橡胶沥青的分离指数降低了68％。此外，研究结果表明，与沥青相比，弹性回复率提高了6％，耐水扩散性提高了27％，粘度降低了12.5％，刚度提高了10％，应力松弛能力提高了5％。具有未经处理的橡胶。该研究的结果通过提供一种低成本的生物启发方法同时提供废轮胎回收的解决方案，同时提高了路面性能，从而促进了资源节约。