Innovative Solidification and Stabilization Techniques Using Industrial By-Products for Soil Remediation  
[PERSON]  
1 Dipartimento di Ingegneria, Universita degli Studi di Napoli \"Parthenope\", Centro Direzionale, Isola C4, 80143 Napoli, NA, Italy; [EMAIL_ADDRESS] (A.A.); [EMAIL_ADDRESS] (F.C. ); [EMAIL_ADDRESS] (I.F. )2  
[PERSON]  
2 Dipartimento di Ingegneria Civile, Universita degli Studi di Salerno, Via Giovanni Paolo II, 132-84084 Fisciano, SA, Italy; [EMAIL_ADDRESS] (F.F. ); [EMAIL_ADDRESS] (G.D.C. )3  
[PERSON]  
1 Dipartimento di Ingegneria, Universita degli Studi di Napoli \"Parthenope\", Centro Direzionale, Isola C4, 80143 Napoli, NA, Italy; [EMAIL_ADDRESS] (A.A.); [EMAIL_ADDRESS] (F.C. ); [EMAIL_ADDRESS] (I.F. )2  
[PERSON]  
1 Dipartimento di Ingegneria, Universita degli Studi di Napoli \"Parthenope\", Centro Direzionale, Isola C4, 80143 Napoli, NA, Italy; [EMAIL_ADDRESS] (A.A.); [EMAIL_ADDRESS] (F.C. ); [EMAIL_ADDRESS] (I.F. )2  
[PERSON]  
2 Dipartimento di Ingegneria Civile, Universita degli Studi di Salerno, Via Giovanni Paolo II, 132-84084 Fisciano, SA, Italy; [EMAIL_ADDRESS] (F.F. ); [EMAIL_ADDRESS] (G.D.C. )3  
[PERSON]  
1 Dipartimento di Ingegneria, Universita degli Studi di Napoli \"Parthenope\", Centro Direzionale, Isola C4, 80143 Napoli, NA, Italy; [EMAIL_ADDRESS] (A.A.); [EMAIL_ADDRESS] (F.C. ); [EMAIL_ADDRESS] (I.F. )2  
[PERSON]  
1 Dipartimento di Ingegneria, Universita degli Studi di Napoli \"Parthenope\", Centro Direzionale, Isola C4, 80143 Napoli, NA, Italy; [EMAIL_ADDRESS]. Among the various technologies available for the treatment of contaminated soils, stabilization and solidification (S/S) is recognized as the most effective. The U.S. Environmental Protection Agency (EPA) has validated S/S as a proven treatment technology for 57 different types of waste [5]. S/S has been employed for the treatment of radioactive waste since the 1950s [6]. The methodology involves rendering the contaminating compounds inert by encapsulating them in a solid matrix (solidification) and inducing chemical reactions that reduce the mobility of contaminants in the material to be remediated (stabilization) [7]. The process mainly consists of mixing the contaminated soil with binders such as cement or cement-line mixtures, sometimes integrated with specific additives [8; 9]. In recent years, the use of more sustainable alternatives to traditional ordinary Portland cement (OPC) has been explored, such as calcium aluminate cement (CAC) and metakaolin (MK). These materials have demonstrated not only significant effectiveness in immobilizing contaminants within a monolithic matrix but also a remarkable reduction in greenhouse gas emissions, offering a more environmentally sustainable solution [10]. Therefore, this study focuses on the theoretical analysis of the definition of innovative material mixes, which can be used in the solidification and stabilization of contaminated soils. This research explores the possibility of combining sustainable additives by analyzing the results derived from sources of industrial waste materials to optimize material mixing. It should be noted that this study primarily focuses on the theoretical part of mix design, with the aim of developing a mix that can be validated in subsequent experimental studies. Solidification/stabilization (S/S) enhances the safety of contaminated soils for disposal or reuse, significantly mitigating risks to human health and the environment [11]. The treated sediments can be reused as filling material, blocks, aggregates for road construction, components for cement mortars, or raw materials for brick production [12; 13]. Alternatively, they can be disposed of in landfills designated for non-hazardous waste. In this context, the present manuscript provides a detailed analysis of the contaminant content in the studied soils, the solidification/stabilization procedure, and the optimization of the mixes using industrial by-products. This study emphasizes the critical importance of adapting the mix design to address the specific contaminants in each case.