ENERGY-EFFICIENT ECOLOGICAL BUILDING MATERIALS: A NEW GENERATION

SCIENCE AND INNOVATION INTERNATIONAL SCIENTIFIC JOURNAL VOLUME 4 ISSUE 12 DECEMBER 2025 ISSN: 2181-3337 | SCIENTISTS.UZ 36 ENERGY-EFFICIENT ECOLOGICAL BUILDING MATERIALS: A NEW GENERATION Y.S. Oʻtanov Master’s student, Tashkent University of Architecture and Construction https://doi.org/10.5281/zenodo.18065379 Abstract. This article provides a comprehensive analysis of modern energy-efficient and environmentally friendly building materials, focusing on their technical characteristics, application potential, and suitability for the climatic conditions of Uzbekistan. Within the scope of the study, the thermal-physical parameters, energy-saving potential, and environmental performance of vacuum insulation panels, aerogel-based composites, phase-change materials, nanotechnology-based composites, and locally available natural materials were comparatively evaluated. Based on an analysis of international and domestic scientific literature, the advantages and disadvantages of various materials were identified. The three complex tables presented in the article comprehensively reflect the technical, energy, and environmental characteristics of the materials and serve as a practical reference for professionals. Keywords: energy efficiency, ecological building materials, thermal insulation, aerogel, vacuum panels, adobe–clay composite, climate of Uzbekistan, sustainable construction, life-cycle analysis. Introduction. At present, the global community is increasingly concerned about the problems of climate change and the limited availability of energy resources. The construction sector accounts for approximately 40% of global energy consumption and about 36% of carbon dioxide emissions. In this context, the development and application of energy-efficient and environmentally friendly building materials have become one of the priority directions of the modern construction industry. In recent years, rapid growth has been observed in the construction sector of the Republic of Uzbekistan, and within this process, consideration of environmental requirements and the implementation of energy-saving technologies constitute an important part of state policy. New-generation building materials are characterized not only by high thermal insulation properties but also by low energy demand during production and minimal environmental impact. Compared to traditional construction materials, these materials offer several advantages, including high strength, long service life, recyclability, and safety for human health. Today, innovative products such as aerogels, vacuum insulation panels, nanotechnology-based composites, and biobased materials are being actively introduced into construction practice. Under the climatic conditions of Uzbekistan, especially in hot climate zones, ensuring energy efficiency and reducing costs associated with cooling and heating of buildings is of particular importance. Studies indicate that the use of properly selected energy-efficient materials can reduce energy consumption during building operation by up to 40–60%. This contributes not only to economic efficiency but also to environmental sustainability. In addition, Uzbekistan possesses significant potential for developing local ecological building materials by combining available natural resources—such as straw, clay, reed, and other organic materials—with modern technologies. SCIENCE AND INNOVATION INTERNATIONAL SCIENTIFIC JOURNAL VOLUME 4 ISSUE 12 DECEMBER 2025 ISSN: 2181-3337 | SCIENTISTS.UZ 37 The relevance of this study lies in examining the properties of energy-efficient building materials, assessing their application potential, and identifying the most effective options for the construction industry of Uzbekistan. The results of the study have practical significance for architects, construction engineers, designers, and investors and may serve as a guideline for the design and construction of modern ecological buildings. Research Methodology. A comprehensive approach was employed in the research process. In the first stage, a systematic analysis of international and domestic scientific literature, international standards, and publications related to modern building materials was conducted. The theoretical and methodological framework was based on inductive and deductive reasoning methods, comparative analysis, and generalization techniques. Through an expert evaluation method, a system of specific indicators was developed to assess the suitability of various materials for the climatic conditions of Uzbekistan, followed by comparative analysis. Statistical analysis methods, graphical visualization, and mathematical modeling tools were applied to process the obtained data. Based on the research findings, practical recommendations were developed. Literature Review. Bal et al. (2025), in the article “Next Generation Building Materials for Energy Efficiency”, analyze the thermal insulation properties, durability, and environmental impact of various energy-efficient materials. The authors present current trends in aerogels, vacuum insulation panels, phase change materials (PCM), and bio-based materials. Their conclusions indicate that while these materials significantly reduce energy losses in buildings, high production and integration costs remain a major challenge. In the study by Wiley (2025), the authors examine the life-cycle energy performance of energy-efficient materials, their thermal insulation characteristics, and their integration with green elements. The main focus is placed on considering not only operational energy savings but also energy consumption during the production stage when selecting materials. Li et al. (2025) analyze global trends in green building materials, recycling technologies, and sustainable architectural solutions. The authors highlight promising directions in the integration of energy-efficient materials with ecological systems, such as solar panel integration. In Russia, research on energy-efficient building materials has been developing in line with state programs over the past five years. Medvedeva (2022) studied the dynamics of energy-efficient construction development in Russia, emphasizing the importance of balancing regional conditions, regulatory frameworks, and resource availability. Klokov and Korelina (2023) analyzed the main barriers to implementing energy-saving technologies, including insufficient economic incentives, complexities in certification processes, and limitations imposed by technical regulations. As a practical solution, they propose the implementation of an “energy monitoring” system. Sheina (2022) examined the adaptation of foreign experience to the Russian construction system, comparing Scandinavian and German practices and analyzing the most suitable insulation materials for local climatic conditions. Uzbek scholars are also actively conducting research in the field of energy-efficient and environmentally friendly building materials. Normatova (2020) investigated the design of energyefficient buildings under the climatic conditions of Uzbekistan, scientifically substantiating the potential of passive solar energy utilization. Kadabaeva (2023) studied methods for improving thermal insulation and energy efficiency using lightweight construction materials such as aerated concrete, expanded polystyrene, and arbolite produced domestically. Her findings indicate that materials manufactured from local raw resources have strong potential to replace imports. SCIENCE AND INNOVATION INTERNATIONAL SCIENTIFIC JOURNAL VOLUME 4 ISSUE 12 DECEMBER 2025 ISSN: 2181-3337 | SCIENTISTS.UZ 38 Hasanov (2023) demonstrated that integrating thermal systems, wall materials, and solar panels in energy-efficient buildings can reduce energy consumption by 25–30%. Abdurakhmonov (2023), in the article “Innovative Activities and Efficiency Enhancement in the Production of Building Materials”, examined innovative directions in building material production in Uzbekistan, focusing on energy efficiency and methods for improving production performance. The author proposes localization strategies and the implementation of energy-efficient equipment and technologies. Analysis and Results. In recent years, energy efficiency and environmental sustainability have become key priorities in the construction sector. In developed countries, the concept of “green building” has been widely adopted, emphasizing the environmental safety of building materials, their thermal insulation performance, and recyclability. Uzbekistan has also taken significant steps in this direction, including the introduction of technologies for producing energy-efficient bricks, lightweight concrete, fiberglass, and bio-based materials. The analysis shows that the use of energy-efficient materials not only reduces energy consumption during construction by 25–40% but also decreases operational costs of buildings by 20–30%. For example, in multi-storey buildings, the use of polyurethane foam panels or aerogel-based coatings for thermal insulation has been shown to reduce heat loss by up to two times. In addition, biocomposite materials based on wood fiber, bamboo, reed, cotton husks, or paper waste not only reduce the carbon footprint but also enable the transition to waste-free technologies due to their recyclability. These materials are preferable to traditional concrete and plastic materials due to their low thermal conductivity, light weight, and aesthetic appearance. The analysis also highlights the necessity of comparing the technical and economic indicators of newgeneration building materials. The table below presents several modern energy-efficient materials and their key advantages: Table 1. Technical and Economic Indicators of New-Generation Building Materials Material Type Key Characteristics Level of Energy Efficiency Environmental Advantages Aerogel panels Extremely low thermal conductivity (0.013 W/m·K) 40–50% Recyclable, non-toxic Bio-binder concrete Based on natural microorganisms 25–35% Capable of CO₂ absorption Solar energyharvesting glass Generates energy through glazing 30–40% Energy generation combined with insulation Hydrogel-based bricks Regulates moisture 20–25% Improves indoor air quality Source: Compiled by the author based on available data. According to experts in the construction sector, the main advantage of new-generation building materials lies in their ability to reduce energy consumption while simultaneously minimizing environmental impact. Therefore, it is essential to expand production lines based on environmentally friendly raw materials, promote the processing of local raw resources, and encourage the adoption of energy-efficient technologies. However, the analysis also identified several challenges. In particular, the share of energy-efficient materials production in Uzbekistan SCIENCE AND INNOVATION INTERNATIONAL SCIENTIFIC JOURNAL VOLUME 4 ISSUE 12 DECEMBER 2025 ISSN: 2181-3337 | SCIENTISTS.UZ 39 has not yet exceeded 10%; technological equipment is largely dependent on imports; and certification and quality standard systems have not been fully implemented. For this reason, strengthening the scientific research base and harmonizing national standards with international requirements remain key priorities in the implementation of new-generation materials. The comparative data presented in Table 2 clearly demonstrate a number of significant technical advantages of new-generation energy-efficient materials over conventional construction materials. When analyzing the most critical parameter—the thermal conductivity coefficient— vacuum insulation panels exhibit the highest performance. Their thermal conductivity (λ) ranges from 0.004 to 0.008 W/m·K, which is approximately 70–200 times lower than that of traditional brick and 160–380 times lower than that of conventional concrete. Such extremely low thermal conductivity is achieved through vacuum technology, whereby the internal cavity of the panel is highly evacuated, effectively eliminating heat transfer mechanisms related to convection and conduction. Table 2. Thermal-Physical Properties of Energy-Efficient Building Materials Material Type Thermal Conducti vity λ (W/m·K) Dens ity ρ (kg/ m³) Vapor Permeabi lity μ (mg/m·s· Pa) Specifi c Heat Capaci ty c (kJ/kg· K) Fire Resistance Class Servi ce Life (year s) Environme ntal Safety Level Convention al brick 0.56–0.81 1600 – 1900 0.09–0.11 0.88 NG (noncombustibl e) 80– 100 High Ordinary concrete 1.28–1.51 2200 – 2400 0.03–0.05 0.84 NG 50– 80 Moderate Wood (pine) 0.15–0.18 450– 550 0.32–0.64 2.3 G3 (low combustibi lity) 40– 60 Very high Mineral wool 0.035– 0.045 35– 150 0.49–0.60 0.84 NG 30– 50 High Expanded polystyrene (EPS) 0.031– 0.038 15– 35 0.02–0.05 1.46 G1–G4 (combustib le) 40– 50 Moderate Extruded polystyrene (XPS) 0.028– 0.034 28– 45 0.01–0.02 1.46 G1–G4 50– 60 Moderate Polyuretha ne foam (PUR) 0.023– 0.028 30– 80 0.02–0.05 1.47 G2–G3 25– 40 Moderate Aerogel composites 0.013– 0.015 80– 150 0.01–0.03 0.84– 1.05 NG–G1 50– 70 High SCIENCE AND INNOVATION INTERNATIONAL SCIENTIFIC JOURNAL VOLUME 4 ISSUE 12 DECEMBER 2025 ISSN: 2181-3337 | SCIENTISTS.UZ 40 Vacuum insulation panels (VIP) 0.004– 0.008 180– 250 <0.001 0.82 NG 40– 50 High Nanocrysta lline cellulose composite 0.022– 0.026 40– 90 0.28–0.45 1.68 G1–G2 35– 55 Very high Gypsum board with PCM (paraffin) 0.18–0.25 900– 1200 0.08–0.12 2.5– 3.8* NG–G1 20– 30 High Straw–clay composite (Uzbekista n) 0.09–0.12 600– 800 0.14–0.18 1.2 NG 30– 50 Very high * Effective heat capacity during phase change of PCM. ** Fire resistance enhanced through special treatment. Aerogel composites rank second in terms of thermal performance, with a thermal conductivity coefficient of 0.013–0.015 W/m·K. Aerogel is a highly porous material produced on the basis of silicon dioxide, and its unique nanostructure effectively blocks heat transfer in all directions. Compared with conventional brick, aerogel provides insulation that is approximately 37–62 times more effective. Modern synthetic materials such as polyurethane foam and extruded polystyrene also demonstrate high thermal performance; however, their environmental safety is assessed as lower than that of aerogel and natural materials (Jelle, 2015). An analysis of density parameters shows that most new-generation materials are significantly lighter than traditional ones. For example, expanded polystyrene has a density of only 15–35 kg/m³, making it approximately 45–127 times lighter than conventional brick and 63–160 times lighter than concrete. This property enables a reduction in the overall structural weight, decreases foundation loads, and lowers transportation costs. However, it should be noted that materials with very low density are typically used only as insulation layers and require additional protective coatings (Sharma, 2019). Fire resistance is also a decisive factor for practical application. Mineral insulation materials, aerogel composites, and natural mineral-based materials belong to the NG (non-combustible) class and provide maximum fire safety. In contrast, synthetic polymer-based materials fall into combustible classes (G1–G4) and require additional fireretardant treatments. Service life and environmental safety are critical parameters from the perspective of longterm use and sustainable development. Traditional mineral materials generally exhibit the longest service life. Among new-generation materials, aerogel provides a service life of approximately 40–70 years, which is sufficient for the planned lifespan of buildings. In terms of environmental safety, natural and bio-based materials—such as wood, nanocrystalline cellulose, straw–clay composites, and cotton husk–based materials—are classified as having a “very high” level of ecological safety. These materials exert minimal impact on human health and the environment and ensure ecological safety throughout the entire life cycle, from production to disposal. SCIENCE AND INNOVATION INTERNATIONAL SCIENTIFIC JOURNAL VOLUME 4 ISSUE 12 DECEMBER 2025 ISSN: 2181-3337 | SCIENTISTS.UZ 41 Table 3 Environmental Indicators and Life Cycle Assessment (LCA) of Various Materials Material Product ion Energy (MJ/m²) CO₂ Emissio ns (kg CO₂/m² ) Recycla bility (%) Disposal Method Ecotoxi city Index Water Consu mptio n (L/m²) Overall Environ mental Score (10-point scale) Conventio nal brick 180– 220 24–32 95–100 Crushing, reuse Low 8–12 6.5 Ordinary concrete 240– 320 38–52 80–90 Crushing, aggregate conversion Moderat e 15–25 5.0 Wood 40–80 5–12 100 Combustion, composting Very low 3–6 9.5 Mineral wool 150– 200 18–26 60–70 Remelting Moderat e 10–15 6.0 Expanded polystyrene (EPS) 380– 480 48–68 30–40 Chemical recycling High 6–10 4.0 Extruded polystyrene (XPS) 420– 550 55–78 25–35 Chemical recycling High 7–12 3.5 Polyuretha ne foam (PUR) 450– 600 60–85 20–30 Pyrolysis, energy recovery Very high 8–14 3.0 Aerogel composites 800– 1200 85– 125 40–50 Specialized recycling Moderat e 12–20 5.5 Vacuum insulation panels (VIP) 900– 1400 95– 140 15–25 Component separation High 15–25 4.5 Nanocrysta lline cellulose– PUR composite 280– 380 32–48 50–60 Biodegradat ion, recycling Low 8–15 7.5 Gypsum board with PCM 220– 300 28–42 70–80 Gypsum recycling, PCM regeneration Moderat e 10–16 6.5 Straw–clay composite 25–45 3–7 100 Full biodegradati on Very low 2–5 9.8 SCIENCE AND INNOVATION INTERNATIONAL SCIENTIFIC JOURNAL VOLUME 4 ISSUE 12 DECEMBER 2025 ISSN: 2181-3337 | SCIENTISTS.UZ 42 Cotton husk composite 30–55 4–9 100 Composting, biodegradati on Very low 2–4 9.5 Source: Asadi, S., Hassan, M. M., & Beheshti, A. (2012). Energy and environmental performance assessment of sustainable building materials using a life cycle assessment approach. Journal of Cleaner Production, 35, 142–150. Table 3 evaluates the environmental characteristics of energy-efficient materials and their environmental impacts based on the Life Cycle Assessment (LCA) approach. This method measures the overall environmental impact of materials throughout their entire life cycle, from production to disposal. In terms of production energy demand, natural and bio-based materials demonstrate a clear advantage: straw–clay composites require only 25–45 MJ/m², while wood requires 40–80 MJ/m² of energy (Petrov, 2016; Mirzaev, 2019). These values are 10–30 times lower than those of modern synthetic and high-technology materials. For instance, the production of vacuum insulation panels requires 900–1400 MJ/m², aerogel production requires 800–1200 MJ/m², and polyurethane foam requires 450–600 MJ/m². A similar trend is observed for carbon dioxide emissions (Asadi, 2012). Natural materials exhibit minimal CO₂ emissions: straw–clay composites emit 3–7 kg CO₂/m², and wood emits 5– 12 kg CO₂/m². Conventional mineral materials show moderate emission levels, such as brick (24– 32 kg CO₂/m²) and concrete (38–52 kg CO₂/m²). The highest emissions are associated with the production of modern synthetic materials: vacuum insulation panels emit 95–140 kg CO₂/m², aerogel composites 85–125 kg CO₂/m², and polyurethane foam 60–85 kg CO₂/m². To compensate for the environmental burden of these materials through energy savings during their operational phase, a payback period of approximately 15–25 years is required. Recyclability is a crucial factor for sustainable development and the principles of a circular economy (Rakhimov, 2021). Natural organic materials such as straw–clay composites and wood are 100% recyclable and fully biodegradable, meaning they return to nature without causing environmental harm. Conventional brick also demonstrates a high recyclability rate (95–100%) and can be crushed and reused in construction applications. Gypsum boards containing phase change materials (PCM) and nanocrystalline cellulose composites exhibit moderate recyclability levels (50–80%). In contrast, synthetic polymers show low recyclability: polyurethane foam (20– 30%), vacuum insulation panels (15–25%), and extruded polystyrene (25–35%). Disposal of these materials requires specialized technologies and additional energy input. The ecotoxicity index assesses the toxic impact of materials on human health and ecosystems (Fedosov, 2018). Natural materials demonstrate a “very low” ecotoxicity level, as they do not emit harmful substances and are non-allergenic. Nanocrystalline cellulose composites also exhibit low ecotoxicity. Mineral insulation materials and aerogel composites fall within the moderate category; while relatively safe, they require careful handling during processing. Synthetic polymers exhibit high to very high ecotoxicity, as they release hazardous substances— such as formaldehyde, styrene, and isocyanates—during production and combustion, thereby necessitating controlled disposal procedures. Water consumption is another important parameter for environmental sustainability, particularly in countries with limited water resources, such as Uzbekistan. Local natural materials require minimal water: straw–clay composites consume 2–5 L/m², and wood requires 3–6 L/m². Conventional mineral materials demand higher water consumption: brick requires 8–12 L/m², and concrete 15–25 L/m². Modern materials exhibit moderate water consumption levels, ranging from SCIENCE AND INNOVATION INTERNATIONAL SCIENTIFIC JOURNAL VOLUME 4 ISSUE 12 DECEMBER 2025 ISSN: 2181-3337 | SCIENTISTS.UZ 43 6 to 25 L/m². The overall environmental score reflects a comprehensive evaluation that integrates all indicators. The lowest scores were recorded for synthetic polymers: polyurethane foam (3.0), extruded polystyrene (3.5), and expanded polystyrene (4.0) (Asadi, 2012; Petrov, 2016). Conclusion Energy-efficient and environmentally friendly building materials have become one of the strategic directions of the modern construction industry. In the context of global sustainable development, carbon footprint reduction, and the implementation of green economy principles, the adoption of energy-saving technologies has become not only an economic necessity but also an environmental imperative. The analysis demonstrates that studies conducted by British, Russian, and Uzbek researchers converge on a common idea: enhancing energy efficiency is a key pathway to rational resource use and environmental safety. In this regard, the development and application of new-generation ecological building materials represent a priority area for Uzbekistan. Achieving progress in this field requires the coordinated integration of scientific research, state policy, and industrial innovation. Innovative materials—such as low-thermal-conductivity composites, recycled waste-based mixtures, and nano-modified concretes—form the foundation of future construction. Thus, energy-efficient ecological building materials are not merely a technical innovation but also a factor that contributes to the advancement of environmental awareness within society. Strengthening the integration between national research, international experience, and local production, training a new generation of specialists, and implementing green building standards constitute an essential step toward an environmentally safe and competitive economy in Uzbekistan. REFERENCES 1. Abduraxmonov M. 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