低炭素建設のためのフライアッシュモルタルのクレードル・トゥ・ゲートLCA：GWP削減、不確実性分析、政策関連性

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:Provides a scenario-based LCA framework with uncertainty analysis for cement substitution, useful for comparative studies in other regions.

🏢実務担当者:Highlights potential GWP reductions from fly ash use, but emphasizes the need for strength and durability testing before adoption.

🏛政策担当者:Offers evidence for promoting fly ash utilization in construction to meet national climate targets, though local data validation is required.

This study has four objectives, namely 1) to quantify the cradle-to-gate Global Warming Potential (GWP) of mortar produced with 0%, 30%, and 50% fly ash substitution; 2) to identify the dominant emission contributors across material production, transport, and mixing; 3) to evaluate uncertainty and sensitivity in the Life Cycle Assessment (LCA) model; and 4) to interpret the mitigation potential in relation to Indonesia’s sustainable-construction and climate-policy context. This study was designed as a scenario-based cradle-to-gate LCA to quantify and compare the GWP of mortar mixtures incorporating fly ash. The functional unit was defined as 1 m3 of mortar targeted to an approximately 25 MPa compressive-strength class; however, the 30% and 50% fly ash mixtures were treated strictly as modelled LCA scenarios rather than experimentally validated mortar formulations. The system boundary was cradle-to-gate, covering raw material production, material transport to the batching plant, and mortar mixing. Fly ash was modelled using a cut-off allocation approach. A Monte Carlo simulation with 10,000 iterations was conducted for the 30% fly ash scenario. The baseline mortar without fly ash substitution generated the highest GWP, at 266.6 kg CO2-eq/m3. Replacing 30% of cement with fly ash reduced the GWP to 190.8 kg CO2-eq/m3, corresponding to a reduction of 75.8 kg CO2-eq/m3 or 28.4% relative to the baseline. A higher substitution level of 50% fly ash further reduced the GWP to 140.2 kg CO2-eq/m3, equivalent to a reduction of 126.4 kg CO2-eq/m3 or 47.4%. Overall, the scenario results indicate that fly ash mortar can be a promising low-carbon material option, but the findings should not be interpreted as proof of mechanical equivalence, and practical implementation requires compressive-strength verification, fly ash quality assessment, durability testing, site-specific transport data, plant-specific cement emission factors, and measured mixing-energy data.

• openalex https://doi.org/10.13189/cea.2026.140517first seen 2026-09-05 05:11:05