###### Abstract
In the preparation of geopolymers based only on waste glass, it has been found that waste glass is suitable as a precursor because it produces geopolymer materials with suitable mechanical strength, but whose development is dependent on the curing conditions, namely relative humidity [38]. In the case of metakaolin-based geopolymer, [PERSON] and [PERSON] have determined that substituting 3% of metakaolin with GW (finer than 38 \(\upmu\)m) resulted in a 2% enhancement in the 28-day compressive strength of the reference sample, reaching 82.36 MPa [41]. However, additional incorporation of GW had a negative impact on strength [41]. Fine glass waste was confirmed by [PERSON] et al. as a suitable alternative to fine sand for use in fly ash/slag-based geopolymer concrete because fine glass particles increase the alkalinity of the matrix, which promotes a greater range of dissolution and reaction in the vicinity of aggregates [42]. However, it was found by [PERSON] et al. that when GW was used as a partial replacement for fine sand aggregate, on the one hand, the flowability of the mixture improved with the glass content, but on the other hand, when 22.5% natural sand was replaced by waste glass, a slight decrease in strength from 126 MPa to 121 MPa was observed [43]. The research revealed that AGW can serve as a replacement for fine aggregate in the production of fly ash-based geopolymer mortar, offering outstanding thermal insulation and fire protection characteristics [44]. The utilization of waste glass as a coarse aggregate has been explored in research such as that conducted by [PERSON] et al., who investigated its impact on the properties of both portland cement (PC) concrete and geopolymer concrete [45]. It was observed that the 28-day compressive and tensile strengths of both PC concrete and geopolymer concrete decrease with an increase in the percentage of recycled glass coarse aggregate [45]. In contrast, a study by [PERSON] et al. has demonstrated that GW can be effectively used as a replacement for coarse aggregate in concrete (up to 50%) without a significant change in strength [46]. Although it seems that the use of glass waste for the preparation of geopolymer materials has already been investigated, studies have mainly focused on the use of GW in the powdered state. Automotive glass waste is non- or hardly recyclable and, in contrast to ordinary broken glass, contains safety films and, in some cases, heating elements [47]. AGW materials have only been tentatively tested as a resource for silica in the production of ferrosilicon [48; 49], silicon carbide [50] or ceramic [51]. However, there has been almost no study of automotive glass waste in the context of geopolymer materials. The present paper deals with the innovative use of automotive glass waste (AGW) as an aggregate in a metakaolin-based geopolymer matrix, and the characterization of leachable organic substances from AGW, and their behavior concerning the particle size applied. Two different AGW materials have been characterized, and the influence of alkaline solutions on pure glass waste has been examined. The effect of AGW in different granulometric fractions on the properties and microstructure of geopolymer composites (AGW-Gs) has been systematically investigated. The quality of the aluminosilicate network in geopolymer solids has been verified by Fourier-transform infrared spectrometry (FTIR). The release of organics from AGW and subsequently from AGW-G has been monitored by gas chromatography/mass spectrometry (GC/MS). The study has been complemented by scanning electron microscopy (SEM) images identifying the AGW, its microstructure affected by alkaline solutions and the AGW-G structure. Additionally, the indicative compressive strength has been measured.