## 1 Introduction  
Eco-innovation is any breakthrough which makes progress towards circular economy and mitigation of the climate change. Both aspects are part of sustainable development. The Industrial Strategy for Europe, published in 2020 [1], underscores the prime concern that industries must face to reach the goal of carbon neutrality [2]. Furthermore, Europe plays a crucial role promoting clear requirements for a Zero Waste Circular Economy over the years across several policies. For instance, the European Commission launched in 2011 the Roadmap to a Resource Efficient Europe [3] with criteria to move towards zero waste in Europe. This EU Communication stipulatedthat incineration with energy recovery should be limited to non-recyclable materials, landfilling should be almost eliminated, and high level of recycling should be ensured. Later, the Communication on Waste-to-Energy [4], published in 2017, showed the role of Waste-to-Energy incineration and it recommended make incineration more expensive. Taxation of such use would therefore be encouraged. In 2018, The Circular Economy Package included a new regulation aiming at recycling 65% of global municipal waste by 2035. In general, these new targets help to move towards a Zero Waste Circular Economy. Complementarily, the revised Renewable Energy Directive (EU) 2018/2001 [5], approved phase-out subsidies to Waste-to-Energy incineration. In 2020, the Taxonomy regulation excluded Waste-to-Energy incineration from the economic activities which meet the criteria to contribute positively to the climate change mitigation because it damages the circular economy [6]. Within this context, pyrolysis of plastics and tires is an upcoming industry which can turn these wastes into energy with lower emissions compared to full combustion [7]. Therefore, this technology can solve the environmental problem of disposing these wastes. In addition, it is a source of by-products such as pyrolysis oil, pyrolysis gas and so on. The increase use of industrial wastes and by-products as supplementary cementitious materials to produce concretes and blended cements is a lever to achieve net zero carbon dioxide emissions [8]. In this respect, it is striking that carbon neutrality will be reached through the outright clinker, cement and concrete value chain by 2050 in agreement with the European Green Deal objectives [2; 9]. In addition, the EU circular economy action plan [9] promotes increasing circularity, natural resources usage reduction and wastes generation minimization. Accordingly, the cement and concrete sectors are playing a key role in circularity due to the potentially increase use of by-products and industrial wastes to produce clinker, cement and concrete [10]. This transition process will need a regulatory framework to enhance this transformation not limited to taxonomy [8]. There are two major advantages of using supplementary cementitious materials in concretes and cements and enhancing sustainability and the first of these is the increase of durability, and then, increasing the service life of concrete structures. This aspect is based largely on the pozzolanic reaction developed with many of these industrial wastes. A second aspect is through Portland clinker lowering. Cement production is responsible for 7.4% of the worldwide carbon dioxide emissions (2.9 Gtons) [11]. Therefore, the clinker factor increase will allow a mitigation of such emissions [8]. Direct emissions decreased in Europe from 783 to 667 kg CO2/t cement between 1990 and 2018. Within this context, the reduction of the clinker to cement ratio has been an important lever for decarbonization. In addition, carbon dioxide uptake due to the mortar and concrete carbonation should be taken into account in the carbon dioxide net balance for the cement and cement-based materials [11]. Aggregates are granular materials, such as sand and gravel, that fill between the seventy and eighty percent of the concrete volume. Therefore, they are its major ingredient. For a good concrete mix, aggregates should be inert.