Study on mechanical properties and carbon sequestration capacity of carbon sequestration concrete based on TOPSIS
Menglei Yuan
School of Construction Engineering
Zizhen Shen
School of Construction Engineering
Lei Wang
School of Construction Engineering
Wenxi Xu
School of Construction Engineering
DOI: https://doi.org/10.59429/pest.v8i1.13410
Keywords: carbon sequestration concrete; TOPSIS; entropy weight method; mechanical properties; carbon sequestration capacity; comprehensive evaluation
Abstract
To address the dual challenges of construction waste recycling and carbon sequestration in the concrete industry, this study employs the TOPSIS method to conduct a comprehensive comparative analysis of the mechanical properties and carbon sequestration capacity between carbon-sequestering concrete and conventional concrete. It systematically investigates the impact of carbon-sequestering concrete on the mechanical performance and carbon sequestration capability of CO2-cured concrete. As global climate change intensifies, the traditional concrete industry—Primarily reliant on cement-based materials— Faces unprecedented environmental pressures due to its massive carbon emissions. Carbon-sequestering concrete (CSC)[1],an innovative technology that actively absorbs and sequesters carbon dioxide, is recognized as a critical pathway to achieving carbon neutrality in the concrete sector. However, while sequestering carbon, CSC often exhibits changes in mechanical properties such as compressive strength, flexural strength, and elastic modulus, posing challenges for engineering applications. The core issue in this field is how to scientifically, comprehensively, and objectively evaluate the overall performance of carbon-sequestering concrete[2], thereby maximizing its carbon sequestration benefits while ensuring structural safety. To address the aforementioned issues, this study proposes a multi-attribute decisionmaking evaluation method based on TOPSIS (Technique for Order Preference by Similarity to Ideal Solution). The method aims to establish a comprehensive evaluation system that simultaneously considers both the mechanical properties and carbon sequestration capacity of carbon-sequestering concrete, thereby providing theoretical foundations and decision-making support for resolving the trade-off and optimization of "performance-benefit" in carbon-sequestering concrete. First, this study systematically investigates the carbon sequestration mechanism and mechanical property influencing factors of carbonsequestering concrete, establishing an 8-item comprehensive evaluation system comprising 5 mechanical performance indicators (compressive strength, flexural strength, elastic modulus, impermeability, and dry shrinkage rate) and 3 carbon sequestration capability indicators (carbon sequestration rate, carbon sequestration per unit volume, and carbon sequestration efficiency). Second, to address the limitations of the TOPSIS method in handling dimensional and magnitude differences among evaluation indicators, the Entropy Weight Method[3] is introduced to determine objective weights for each indicator, thereby eliminating subjective influences on evaluation results. Finally, a case study demonstrates the application process of the developed comprehensive evaluation model, with comparative analysis and ranking of the overall performance of carbon-sequestering concrete with different mix proportions. The research findings demonstrate that the entropy-weighted TOPSIS-based comprehensive evaluation model developed in this study effectively quantifies the performance of carbon sequestration concrete. This model not only provides researchers and engineers with a scientific and objective evaluation tool, but also serves as a critical reference for optimizing concrete mix proportions, regulating performance, and making engineering application decisions[4-6]. The study lays a theoretical foundation for the sustainable development of carbon sequestration concrete and provides robust support for its application in green infrastructure projects.
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