The Synergistic Effect of Polyphosphates Acid and Different Compounds of Waste Cooking Oil on Conventional and Rheological Properties of Modified Bitumen

Abstract

In order to conserve non-renewable natural resources, waste cooking oil (WCO) in bitumen can help lower CO2 emissions and advance the environmental economy. In this study, three different components of WCO were isolated and then, together with polyphosphoric acid (PPA), used separately as bitumen modifiers to determine the suitability of various substances in WCO with PPA. Conventional tests, including penetration, softening point temperature, and ductility, and the dynamic shear rheology (DSR) test, including temperature sweep and frequency sweep, were used to evaluate the influence of WCO/PPA on the traditional performance and rheological properties at high and low temperatures. The results indicate that WCO reduced the ductility and penetration value, when the use of PPA increased the softening point temperature and high-temperature performance. Compared to reference bitumen, the rutting factor and viscous activation energy (Ea) of bitumen modified with 4% WCO and 2% PPA has the most significant increase by 18.6% and 31.5, respectively. All components of WCO have a significant impact on improving the low-temperature performance of PPA-modified bitumen. The performance of the composite-modified bitumen at low temperatures is negatively affected by some waxy compounds in WCO, such as methyl palmitate, which tends to undergo a solid–liquid phase change as the temperature decreases. In conclusion, the inclusion of WCO/PPA in bitumen offers a fresh approach to developing sustainable pavement materials.

Exploring the Self-Healing Capability and Fatigue Performance of Modified Bitumen Incorporating Waste Cooking Oil and Polyphosphoric Acid

“…The significant improvement in the I-value of the virgin bitumen after incorporating the three molecular-weight WCO components can be attributed to the fact that each of the different molecular-weight WCOs contains a certain number of lighter components that complement the resins, aromatics, and saturates of the virgin bitumen. Moreover, the solubilization of asphaltenes by the light fraction also promotes the recovery of the colloidal structure [37,38]. In contrast, the I-value gradually decreases with the increase in PPA content.…”

“…The SARA fraction content is a crucial factor affecting the stability of the bitumen colloid system and the bitumen properties [36,37]. The results of the SARA content of WPmodified bitumen are shown in Figure 8.…”

Study on the Performance and Modification Mechanism of Polyphosphoric Acid (PPA)/Styrene–Butadiene–Styrene (SBS) Composite Modified Asphalt

“…It was found that the feasibility of improving the low-temperature crack resistance of asphalt and its mixture by PPA alone was low, and it needed to work together with other polymers or rubber modifiers. Therefore, in recent years, researchers have gradually turned to the study of multiphase composite modified asphalt [26][27][28][29]. For example, Yajin Han et al [30] found that an appropriate amount of PPA can reduce the phase separation phenomenon of SBR modified asphalt, and its low-temperature performance degradation is not significant.…”

Feasibility and Sustainable Performance of RAP Mixtures with Low-Viscosity Binder and Castor Wax–Corn Oil Rejuvenators

“…This technology not only contributes to sustainable practices, but also offers economic advantages by lowering production costs [12,13]. Another promising technology is the introduction of recycling agents or modifiers specifically designed for RAP [14]. These additives, such as polymers, chemical agents, and bio-rejuvenators, aim to restore the aged binder in RAP materials and improve their rheological properties [15].…”