## 1 Introduction
Its design with the use of a minimal amount of cement paste for the coating of coarse aggregates facilitates the formation of this interconnected network of pores in the material, which allows the passage of water at a much higher rate than in conventional concrete. Pervious concrete belongs to a completely different category from conventional concretes and, therefore, its physical characteristics differ significantly from those of known concretes. It consists of Portland cement, coarse aggregates, little or no aggregates, admixtures, and water, the optimal ratio of which is investigated depending on the nature of the aggregates used and the individual application requirements of the concrete. Finally, the combination of these components leads to the production of a hardened product with interconnected pores ranging in size from 2 to 8 mm, which allows water to easily penetrate the concrete. Its empty spaces range between 18 and 35% and the typical compressive strengths achieved are in the range of 2.8 to 28 MPa [11; 13]. However, the strength of PC decreases with the increase in PC permeability [15; 16; 17]. [PERSON] et al. [18] used 15%, 30%, 50%, and 100% recycled concrete aggregate (RCA) instead of coarse aggregate in PC. The strength of samples with an RCA content of 30% or above decreased significantly, while permeability and pore content increased. [PERSON] et al. [19] indicated that increasing the ratio of binder to aggregate can improve the mechanical properties of the material but reduce the permeability coefficient of the material. Finally, [PERSON] et al. [20] added recycled fine aggregate (RFA) into PC, resulting in an increase of 7% in compressive strength and 37% in splitting tensile strength. Permeable concrete is a type of concrete where the porosity is not in the aggregates but inside the concrete web itself. In recent decades, the steel slags have attracted the attention of the construction industry as they have the potential to be used as a partial replacement of cement due to their pozzolanic characteristics, but also as aggregates replacement in concrete. Moreover, the European Waste Framework Directive [21; 22] highlights the significance of utilizing industrial by-products such as Fe and steel slag aggregates, which helps to minimize waste and conserve resources. Iron and steel slag is a melt that is silicate and is mainly formed during the manufacture of crude steel and crude iron. This is due to the combination of slag and flow agents used to remove impurities from iron ore and other furnace metal feeds [23]. The hot slags are collected from the liquid metal and thus transferred to a slag substrate where they are stored after cooling (spraying in open-air or water) and processed into a solid material. In terms of blast furnace slags and steel slags production, it was found to be higher in Europe at around 45 Mt in 2018 [24], compared to the US where the steel slag production ranged from 8 to 12 Mt [23]. On the other hand, there are wastes that do not decompose or degenerate, and these are the electronic and electrical waste (e-waste items). The use of these items has created another, significantly dangerous stream of waste called \"electronic-waste\" (e-waste). Electronics that are already used and classified for reuse, resale, recycling, or disposals are also considered e-waste. The development of these products has been a threat that is considered extremely serious for both public health and the environment, as e-waste has been growing exponentially in recent years, as markets for them are growing rapidly. The e-waste that is generated is usually disposed in the form of land fill, incineration, reuse, or recycling. However, the cost of these disposal measures is high and has a hazardous effect on our environment. It is necessary to arrive at a cost-effective and environmentally friendly recycling process, which may be considered as the real need hour. [PERSON] [25] studied the utilization of e-waste particles as a fine and coarse aggregate in concrete.