The mathematical model, which could be represented as a fuzzy inference tree for project man-agement aimed at waste usage in wall manufacturing, is proposed in the article. The factors classification that affect production's environmental and economic efficiency is presented. The proposed ecological and economic efficiency criterion and influence factors are linguistic variables consisting of fuzzy terms on the corresponding universal sets. The proposed hierarchical system of mathematical models allows the intelligent choice of proper building material, depending on the influence of environmental parameters, socio-economic parameters, and engineering and technological parameters of a building object, based on fuzzy logical expressions “IF-THEN”. The proposed model could be used as a support system model in the decision-making process at the early feasibility stage. Estimating pros and cons based on the results of a virtual experiment in terms of proposed criterion value for specific construction waste allows proper planning of construction waste usage in the construction sector. The proposed model can be used as a design and engineering tool in the decision-making process for forecasting the ecological and economic efficiency of the use of waste in the manufacture of walls.
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