The research addresses the integration of secondary resources from machine-building enterprises into construction composites as a pathway to reduce clinker consumption, lower the carbon footprint, and improve industrial sustainability. A symbiotic model was developed that links a machine-building plant as a donor of metallurgical, glass, and polymer by-products with construction material production as a recipient. The model operates on weekly “generation–utilization–storage” balances for production lots of 10 m³ and is optimized under three groups of constraints: economic (cost minimization), environmental (CO₂ intensity reduction), and technical (compressive strength, water absorption, and chloride permeability by RCPT). A multi-objective optimization scheme using ε-constraint methods was applied together with regression-based property models and stochastic simulations (Monte Carlo and bootstrap). The analysis demonstrates that partial clinker substitution with up to 50% ground granulated blast-furnace slag and up to 20% recycled glass achieves a 40–45% reduction in unit CO₂ emissions, while maintaining 28-day strength above 40 MPa and RCPT values within 2,000–3,000 C (Coulombs). The Pareto front highlights an equilibrium zone of 55–60% CO₂ and 84–87% relative cost as a rational compromise between environmental and economic performance. Statistical verification confirms the robustness of the solutions with failure probability Pf < 10%. Practical implications include the ability to design low-carbon mixtures with predictable durability, integrate secondary resource flows into construction supply chains with ≥95% utilization efficiency (and >97% for glass/ash streams), and reduce regulatory and environmental risks. The framework provides machine-building and construction industries with a reproducible methodology to scale decarbonization strategies while ensuring infrastructure reliability.