Estado del conocimiento sobre aditivos utilizados en la fabricación de mezclas asfálticas tibias (MAT). Caso de estudio: periodo 2017-2023

Abstract

The use of asphalt concrete mixtures for the formation of asphalt layers in road infrastructure construction projects is common. This is due to their properties, which make them ideal for the construction of any traffic surface. Additionally, compared to cold mix asphalt, they tend to be more resistant and durable under traffic loads. However, their use has a negative impact on the environment, as they must be manufactured in asphalt plants, laid, and compacted on-site at very high temperatures, generating greenhouse gas emissions. To help mitigate this negative environmental impact, warm mix asphalt (WMA) has been developed. These mixtures aim to reduce the high temperatures required for hot mix asphalt manufacturing, using techniques such as foaming and the use of additives, whether organic or chemical, among others. Currently, the research groups TOPOVIAL, the Center for Studies in Pavements and Sustainable Materials, and the Research Group in Roads and Pavements are developing the project: - 'Development of a Warm Mix Asphalt (WMA) with Recycled Concrete Aggregate (RCA),' funded by Call 01-2023 of the Universidad Distrital Francisco José de Caldas. Within the activities and objectives of the project, there is the performance of a state-of-the-art review on WMAs, and, in turn, within this study, the development of a state-of-the-art review on the additives used to manufacture these mixtures. Therefore, the present project seeks to support the aforementioned research groups by conducting a literature review to identify the state of knowledge on the use of additives in WMA manufacturing. This study aims to identify trends by analyzing the different additives used in WMA manufacturing, compiling and comparing information regarding manufacturing processes, characteristics of each additive, and changes in asphalt mixture properties. This literature review will be conducted through an information search in academic databases, such as Science Direct, Taylor & Francis, Scielo, ASCE, Springer, among others, including scientific articles, technical documents such as final research reports, and doctoral and master's theses published in the last five years. Finally, it is expected to have a database regarding the characteristics of the different additives used in WMA manufacturing, which will provide useful information for technicians, engineers, and researchers working on the development and improvement of WMAs. Additionally, this information will be a source of consultation and support for the research groups working on the aforementioned project.