International Science Community Association International Research Journal of Environmental Sciences 15 4 2026 10 22 Material-Related Carbon and Functional Performance of D800 Non-Autoclaved Foam Concrete Modified with Fly Ash and Microsilica 85 95 EN Sirojiddin Muradov 1 Karshi state technical university, Karshi, Uzbekistan Dubey Arti 1 Department of Chemistry, VIVA College Virar (W), Maharashtra, India KANSOLE and Laboratory of Geosciences and Environment (LaGE) Michelline Marie Regina 1 University Yembila Abdoulaye Toguyeni, P.O 54 Fada N' Gourma, Burkina Faso University Joseph KI-ZERBO 2 Multidisciplinary Laboratory for Engineering Science Research, Polytechnic School of Ouagadougou (EPO), 18 PO 234 Ouaga 18, Burkina Faso P.O 7021 3 University Yembila Abdoulaye Toguyeni, P.O 54 Fada N' Gourma, Burkina Faso Ouagadougou 4 Burkina Faso 5 BEIDARI Mohamed 6 KIMA Adama 7 Kumar Brinder 1 Department of Zoology, GGM Science College Jammu, J&K (UT), India Yadav Surender Singh 1 Department of Economics, Government College, Kanina (Mahendergarh), Haryana, India Narayan Laxmi 2 Department of Economics, Government College, Mahendergarh, Haryana, India Musajonov Mukhammadrasul 1 Tashkent State Transport University, Temiryo‘lchilar Street 1, Tashkent, 100167, Uzbekistan Ibadullaev Ahmadjon 2 Tashkent State Transport University, Temiryo‘lchilar Street 1, Tashkent, 100167, Uzbekistan Babayev Askar 3 Tashkent State Transport University, Temiryo‘lchilar Street 1, Tashkent, 100167, Uzbekistan Chorshanbiev Umar 4 Tashkent State Transport University, Temiryo‘lchilar Street 1, Tashkent, 100167, Uzbekistan Souley HAROUNA 1 Department of Civil Engineering, School of Mines, Industry and Geology of Niamey (EMIG), Niamey, Niger Abdourazakou MAMAN HASSAN 2 Department of Mines-Geology, School of Mines, Industry and Geology of Niamey (EMIG), Niamey, Niger IBRAHIM ELHADJI DAOU 3 Department of Mining Engineering and Environment, School of Mines, Industry and Geology of Niamey (EMIG), Niamey, Niger Chékaraou Mahamane Moustapha Sanda 4 Djibo Hamani University of Tahoua, Faculty of Education Sciences, Department of Discipline Didactics, Tahoua-Niger Mansour Badamassi Kadri Mahaman 5 Dept. of Geological and Environmental Sciences, Faculty of Sciences and Techniques, André Salifou University of Zinder (UAS), Zinder, Niger Laouali Idi Karimou 6 Department of SVT, Abdou Moumouni University, Higher Normal School, Niamey, Niger Adama BOUBACAR AMADOU 7 Department of Mines-Geology, School of Mines, Industry and Geology of Niamey (EMIG), Niamey, Niger Usmanovich Samadov Alisher 1 Department of Engineering Communication, Tashkent University of Architecture and Civil Engineering, Tashkent, Uzbekistan qizi Abdusamiyeva Lobarkhon Nomonjon 2 Department of Mining, Almalyk State Technical Institute, Almalyk, Uzbekistan Bakhodirovna Khojimuratova Khilola 3 Department of Mining, Almalyk State Technical Institute, Almalyk, Uzbekistan Khikmatullayevich Ibragimov Umidjon 1 Karshi state technical university, Karshi, Uzbekistan Rubenovich Avanesov Tigran 2 Karshi state technical university, Karshi, Uzbekistan Ubaydullayevna Mirzayorova Sevara 3 Karshi state technical university, Karshi, Uzbekistan Soy Vladimir 1 Department of Construction of Buildings and Industrial Structures, Tashkent State Transport University, Tashkent, Uzbekistan Nuriddinova Gavkhar 2 Department of Construction of Buildings and Industrial Structures, Tashkent State Transport University, Tashkent, Uzbekistan > Research Paper 2026 8 29 2026 10 22 The present study evaluates the environmental and functional performance of D800 non-autoclaved foam concrete in which Portland cement was partially replaced by fly ash and microsilica. A modified binder containing 15% fly ash and 5% microsilica was selected through preliminary screening and compared with a reference composition. The experimental program included density, compressive and flexural strength, thermal conductivity, and SEM observations. Environmental performance was assessed by a comparative material-related global warming potential (GWP) calculation using EPD- and LCI-based emission factors, together with performance-normalized carbon intensity and sensitivity analysis for the environmental burdens assigned to the secondary mineral components. The modified mixture reduced Portland-cement consumption by 20% and incorporated 83 kg/m³ of secondary industrial materials. Its 28-day compressive strength increased from 3.00 to 4.20 MPa, while thermal conductivity decreased from 0.270 to 0.221 W/(m•K). Material-related GWP declined from 355.16 to 311.09 kg CO₂-eq/m³, corresponding to a reduction of 12.4%, whereas carbon intensity decreased by 37.4%. Under a conservative sensitivity scenario, the modified mixture still maintained lower GWP and carbon intensity than the reference. These findings show that the proposed modification strategy improves resource efficiency without compromising functional performance. Overall, the optimized foam-concrete system incorporating fly ash and microsilica as partial cement replacements reduced cement demand and material-related carbon burden while maintaining improved mechanical and thermal performance relative to the reference composition. Copyright@ International Science Community Association