Abstract
Based on an analysis of the cold regeneration mechanism of emulsified asphalt, the emulsified asphalt binders and cement were applied to prepare the cold recycled mixtures, and the main technical performances of the designed mixtures were evaluated, including high-temperature stability, water stability, and fatigue characteristics. A high content of 65% recycled asphalt pavement (RAP) material was used with some new aggregates and mineral powders, and the optimal emulsified asphalt binder and cement dosages were determined as 2.9% and 1.5% respectively. The technical performance test results show that: (1) The well-designed emulsified asphalt cold recycled mixtures have good high-temperature stability and water stability, and can meet the requirements of the road base layer and the lower layer. (2) When the stress level is lower, the fatigue performance of mixtures with lower emulsified asphalt binder dosage and lower cement content is better, but when the stress level is higher, the high dosage of emulsified asphalt binder is more favorable, while the cement content has little effect on the fatigue property. (3) The emulsified asphalt cold recycled mixtures have relatively poor fatigue resistance, and their fatigue life is significantly lower than that of the hot mixed asphalt mixtures.
Highlights
Along with the burgeoning construction of transportation infrastructures, the mileage of highways is constantly increasing; many of the early built highways have served for a long time, and highway performance obviously declines, bringing about the need for continuous maintenance and renovation.In recent years, highway repair and renovation have become increasingly arduous, and more and more used pavement materials are generated during those processes, such as asphalt pavement materials, cement concrete pavement materials, and so on
Cold recycling technology is the main way for asphalt pavement regeneration, and the use of emulsified asphalt binder for cold regeneration has rapidly become popular [5,6]
The above studies have undoubtedly had positive influences on the improvement of the performance of emulsified asphalt cold recycled mixtures (EACRM), but they mainly focus on the effects of recycled asphalt pavement (RAP) content and properties, adhesion and spalling mechanism, asphalt type, additives type, and content on the pavement performance of cold recycled mixtures, and little study has been undertaken on the effects of material properties and composition ratios on the technical performance of EACRM
Summary
Along with the burgeoning construction of transportation infrastructures, the mileage of highways is constantly increasing; many of the early built highways have served for a long time, and highway performance obviously declines, bringing about the need for continuous maintenance and renovation. The application of emulsified asphalt cold recycled mixtures (EACRM) to pave the surface and base layers of roads can reduce construction costs, energy consumption, and environmental pollution [7]. The above studies have undoubtedly had positive influences on the improvement of the performance of EACRM, but they mainly focus on the effects of RAP content and properties, adhesion and spalling mechanism, asphalt type, additives type, and content on the pavement performance of cold recycled mixtures, and little study has been undertaken on the effects of material properties and composition ratios on the technical performance of EACRM. This study adopts the vibration compaction molding method, which is more in line with the actual situation to study the influence of material properties and composition ratio on emulsified asphalt cold recycled mixtures. The research results are of referential value in engineering practice
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