Optimising Sustainable Deconstruction Strategies for Concrete Structures: A Multi-Criteria Decision Framework Approach

Purpose

This study proposes a Multi-Criteria Decision Analysis (MCDA) framework to optimise sustainable deconstruction strategies for precast concrete buildings. The framework aims to maximise material recovery, minimises environmental impacts, and ensures cost-effectiveness, providing stakeholders with an evidence-based tool for decision-making.

Design/methodology/approach

The framework integrates the Analytic Hierarchy Process (AHP) and VIKOR methods to evaluate eighteen deconstruction strategies across four categories: concrete component removal, reinforcement separation, structural dismantling, and material recycling. A case study of a four-storey university building was modelled using DesignBuilder software to simulate material flows and assess performance metrics. Stakeholder input was used to determine criteria weights, balancing environmental, economic, and technical dimensions. Findings (limit 100 words) Selective removal strategies, particularly staircase dismantling (D3) and wall panel removal (D1), yielded optimal material recovery and cost efficiency while minimising environmental and safety risks. Scenario S1 demonstrated adaptability as an early-stage strategy for precast panel removal.

Practical implications

This framework serves as a practical tool for contractors, policymakers, and environmental agencies, enabling the prioritisation of deconstruction strategies that align with sustainability objectives. It supports global climate goals by reducing emissions and enhancing the value of recycled materials.

Originality/value

This study advances sustainable deconstruction by integrating AHP and VIKOR into a cohesive MCDA framework. It offers a practical decision-making tool for contractors, policymakers, and environmental agencies, contributing new insights to the construction industry and supporting global sustainability goals.