## 1 Introduction
An experimental study was made on the use of e-waste particles as fine and coarse aggregates in concrete with a percentage replacement ranging from 0% to 30% (in an interval of 10%) for the M20 grade of concrete. The compressive strength, tensile strength, and flexural strength of concrete with e-waste give better strength as compared to concrete without e-waste. The problem of solid waste disposal and management in all countries has become one of the most important environmental, economic, and social issues. Usually, electronic plastics are not recycled, the same type of plastic products made from recycled plastics that are often not recyclable. Several researchers have used e-wastes in concrete mixtures in order to partially replace the natural aggregate rocks such as home appliances, information and communication technology devices, home entertainment devices, electronic utilities, and office and medical equipment [26; 27; 28; 29], producing concrete specimens of satisfactory compressive strength when sometimes producing specimens characterized by a significant improvement in their compressive strength in contrast to those of conventional concrete [25; 30]. It is evident that there is potential for further research into the production of environmentally friendly concrete specimens containing different types of wastes as environmental benefits are certainly anticipated. Numerous researchers have studied the use and impact of recycled materials on the production of pervious concrete specimens as required by sustainable development, which are followed by all the developed and modern states. However, most researchers have not focused on the effect of microstructure and on the behavior of these materials on the micro-scale where the initial failures of concrete during loading occur. This is exactly the research gap that the present study fills by studying different wastes on a micro scale. Furthermore, the present study gives the trigger for such a large-scale application where it could provide significant economic benefits as the construction industry is one of the most attractive industries for which there are great benefits, provided that business strategies of the circular economy are followed as the dynamic growth prospects and opportunities arise for the whole construction business, through the circular economy. The construction sector plays a very important role in the European economy as it produces 10% of the EU's GDP and provides 20 million jobs to respective companies. It is also mentioned that the construction industry is also important as it uses a significant percentage of intermediate products (raw materials, chemicals, electrical, and electrical equipment) and related services. The roadmap for a Europe that uses its resources efficiently (European Commission, Strategy 2020) estimates that the optimal construction and use of buildings could contribute to significant savings of natural resources such as 42% of the total final energy consumption and 35% of total greenhouse gas emissions. Based on the aforementioned principles, the main goal of this research is to promote the effective use of available by-products and wastes from Greece, thus replacing the natural aggregates in concrete production for a variety of applications, thus improving the sustainability of pervious concrete. This is a case study that, in the near future, can be generalized. Furthermore, the resistance to intense temperature changes--cooling/thawing conditions--as well as their durability in freeze and thaw cycles is studied.