Warm mix asphalt (WMA)Techniques: Advantages and disadvantages - A review

The release of greenhouse effects into the environment is one of the factors contributing to pollution connected to the development of transportation infrastructure. Warm mix asphalt (WMA) technology creates asphalt at lower temperatures (20–40°C) than hot mix asphalt, which makes it environmentally friendly although it has several benefits unrelated to lowering the production of gases. This is accomplished by lowering the temperatures at which asphalt mixes mix and compresses without changing the mix’s characteristics. This is made feasible by a variety of industry-available technologies. The utilization of several recently developed technology is what allows WMA to reduce temperature, and which are divided into the three categories below: organic additives, chemical additives, and water-based or water-containing foaming processes. While their ultimate objective is same, the production procedure varies among them. Consequently, their primary goal is to lower asphalt viscosity, which enhances mix workability, reduces emissions, and overall improves conditions for working. This paper aims to provide an overview of multiple Warm Mix Asphalt (WMA) methods used in pavement engineering (techniques employed in WMA production). The goal is to give a thorough overview of this technology so that engineers and practitioners can use it as a foundation to organize all of the processes involved in designing and building roads in a way that promotes worker safety and health and that takes environmental responsibility into consideration. This paper offers a current overview of WMA technologies. The most popular additions and environmental advantages of this production process are also presented and contrasted in the study with other studies. It also describes their drawbacks and emphasizes the necessity for more investigation in this field.