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• Foam glass is produced using waste bottle glass and silicon cutting waste. • Silicon cutting waste acts as the foaming agent and is compared with SiC reagent. • Foam glass is produced at a relatively low sintering temperature of 775 °C. • The produced foam glass meets the standards for thermal insulation materials. • Simultaneous waste valorization of the two kinds of solid wastes is achieved. This study created foam glass from waste bottle glass employing silicon cutting waste (SCW) of loose abrasive slurry sawing as the foaming agent. The influence of affecting parameters, namely sintering temperature, glass powder particle size, SCW dosage, heating rate, holding time, were investigated. The produced foam glass was characterized to examine its microstructure, bulk density, compressive strength, porosity, and thermal conductivity, and was compared with that produced using silicon carbide (SiC) reagent as the foaming agent. The results indicated that under the optimal conditions of sintering temperature of 775 °C, glass powder particle size of 0.15 mm, SCW dosage of 1 wt% (the D 50 of SiC in SCW was ca. 10 μm), heating rate of 10 °C/min, and holding time of 30 min, the produced foam glass had a compressive strength of 4.1 MPa, bulk density of 0.56 g/cm3, porosity of 78%, and thermal conductivity of 0.16 W/m·k; these properties meet with standards for thermal insulation materials. In contrast, using SiC reagent with a D 50 of ca. 22 μm revealed 900 °C as the optimal sintering temperature, which yielded foam glass having a compressive strength of 5.4 MPa, bulk density of 0.67 g/cm3, porosity of 73%, and thermal conductivity of 0.2 W/m·k. By using SCW as the foaming agent, foam glass is able to be produced under comparatively low temperature and has favorable properties. In addition, the simultaneous waste valorization of waste bottle glass and SCW can be achieved. [ABSTRACT FROM AUTHOR]

The paper presents experimental results obtained by a team of researchers from the company Daily Sourcing & Research SRL Bucharest in the field of producing the foamed glass-ceramic from waste bottle glass, coal ash and silicon carbide as foaming agent. The originality of the experiments consists in the use of electricity or microwave energy, unlike all techniques known worldwide consumers of fossil fuel. The product, obtained with low energy consumptions and very low pollutants emissions, has physical and mechanical characteristics of an insulating material, i.e. high porosity, low thermal conductivity and an adequate compressive strength.

The paper presents experimental results obtained by a team of researchers from the company Daily Sourcing & Research SRL Bucharest in the field of producing the foamed glass-ceramic from waste bottle glass, coal ash and silicon carbide as foaming agent. The originality of the experiments consists in the use of electricity or microwave energy, unlike all techniques known worldwide consumers of fossil fuel. The product, obtained with low energy consumptions and very low pollutants emissions, has physical and mechanical characteristics of an insulating material, i.e. high porosity, low thermal conductivity and an adequate compressive strength. [ABSTRACT FROM AUTHOR]

• Waste bottle glass nanoparticles used as precursor to achieve high-strength alkali-activated mortars. • Waste bottle glass nanoparticles increased strength by 16 to 18% • Strength of 68.6 MPa attained using 5% waste bottle glass nanoparticles. • Use of bottle glass offers added value recycling technique. • Machine learning informational model accurately predicts strength of alkali-activated mortars. Alkali-activated materials (AAMs) have emerged as a sustainable, clinker free binder alternative to portland cement, with reduced consumption of raw materials and very low CO 2 emissions. They are produced via the activation of aluminosilicates with alkaline solutions. Millions of tons of bottle glass waste are generated annually worldwide and only a small amount are re-utilized and recycled. Various recycling processes need to be innovated to reduce the volume of waste glasses, which is often landfilled, causing environmental concerns. Waste glass has been utilized as fine aggregate in concrete or as partial replacement for cement. In this study, waste bottle glass nanoparticles (WBGNPs) were incorporated as a precursor combined with ground blast furnace slag (GBFS) and fly ash (FA) to achieve high-strength alkali-activated mortars (AAMs). The effect of WBGNPs, sodium hydroxide molarity, solution modulus (SiO 2 :Na 2 O), alkaline solution content, and binder-to-aggregate ratio on the compressive strength development of AAMs were investigated. The strength characteristics of the studied AAMs were assessed by developing an informational model united with a metaheuristic shuffled frog-leaping algorithm (SFLA). The experimental results indicated that after 28 days of curing, AAM prepared with 5% of WBGNPs (precursor) as GBFS/FA replacement attained an improved compressive strength in the range of 16 to 18.4%. Additionally, the optimum mixture containing 5% of WBGNPs as GBFS replacement achieved a strength of 68.6 MPa after 28 days of curing. It was shown that the novel informational SFLA model attained accurate predictions and could appreciably simplify generative design in future computational intelligence of a construction materials platform in civil engineering. [ABSTRACT FROM AUTHOR]