Methods to Evaluate the Aging Grades of Reclaimed Asphalt Binder

Abstract

Featured Application: The development of aging grades for reclaimed asphalt binder can be used to guide the design of RAP mixtures. Abstract:The use of reclaimed asphalt pavement (RAP) is of great significance for alleviating the problem of resource waste and land space occupation in the context of asphalt pavement. However, the use rate of RAP is still low in many countries because of limited understanding and no unified recycling guidelines, especially in terms of materials classification and aging grades. In this study, reclaimed asphalt pavements from sixteen different sections in southern China were collected, including with base and polymer modified asphalt (PMA). The performance of the reclaimed asphalt binder (RAB) at low, average and high temperatures was tested, using various methods, to find suitable indexes for categorizing aging grades. The viscosity (135 • C) and penetration (25 • C) were found to distinguish the aging degree of RAB the most consistently, and served as the indices to classify the RAB into different grades. To simplify the evaluation of aging grades, a comprehensive service life was determined using the Analytic Hierarchy Process, taking service years and surface levels into account. As a result, a good correlation was found between comprehensive service life and the aging grades.

Comparison of Chemical and Microstructural Properties of Virgin and Reclaimed Asphalt Pavement Binders and Their Saturate, Aromatic, Resin, and Asphaltene Fractions

“…(3) The ESEM fibril microstructure of the heavily aged binders, such as RAP, may be heavier and denser and may need more intense irradiation to appear, as in the case of the HL8 24 h samples in this study. (4) The ESEM analysis of the laboratory contact blended binders showed that the increase in the temperature from 20 to 60 °C increases the width of the blended zone of the two binders. (5) Both the ESEM and FTIR analyses showed that the increase in silo storage time for the HL8 blended binder caused significant aging.…”

“…3 In addition to the cost benefits of being able to produce new asphalt from old asphalt, there is also the advantage of reducing the carbon footprint of the construction significantly by reducing the emissions in the transportation of raw materials as well as the reduction in the extraction of virgin aggregates. 4 Additionally, this allows for the removal of a potential waste product in old asphalt pavement. 5 The binder in RAP is chemically transformed, notably as a result of oxidation, as it ages during service in the field.…”

Choosing the Production Function Model for an Optimal Measurement of the Restructuring Efficiency of the Polish Metallurgical Sector in Years 2000–2015

“…Kou et al [28] state that AHP was initially developed, making the most use of field data, laboratory results, and experts' experience, for applications in multicriteria decision-making, planning, and resource allocation, and in conflict resolution. Further discussion of the method can be found in [29,30], whereas its critique in [31][32][33], answered in [34].…”

Micromechanism of the Dispersion Behavior of Polymer-Modified Rejuvenators in Aged Asphalt Material

“…Rejuvenators, due to their rich maltene constituents and high permeation ability, can re-balance the composition of aged asphalt binders and have become the key material in pavement-recycling technology [1][2][3]. In recent years, many pavement materials have reached the end of their service life and have been abandoned in the city (Figure 1).…”