A Standards-Informed Digital Platform for Exposure-Based, Performance-Oriented, and Low-Carbon Concrete Mix Design

Concrete proportioning in routine practice often relies on separate spreadsheets, code tables, and trial-batch records, making simultaneous control of strength, exposure resistance, workability, cost, and embodied carbon difficult. Although existing standards provide valuable guidance, a scientific and practical gap remains in converting fragmented provisions into an integrated workflow for performance-oriented and low-carbon mix design. This paper presents the EcoStruct platform, a thirteen-tab digital workflow for normal concrete mix design. The workflow integrates international guidance, including ACI 211.1, ACI durability provisions, EN 206, BS 8500, EN 197-1, ASTM C150, ASTM C33, ASTM C127/C128, EN 12620, EN 934-2, and DIN 1045-based aggregate gradation logic. The platform covers project definition, exposure limits, SCMs and admixtures, material characterization, target strength, aggregate grading, water–cement ratio, free-water demand, cement adjustment, absolute-volume aggregate calculation, performance prediction, laboratory trial, and reporting. A precast tunnel-lining segment was used to compare the platform with BRE and SP 23:1982. The platform mixture contained 440 kg/m3 cement and 190 kg/m3 water. Compared with BRE and SP 23:1982, it reduced free-water and cement demand while maintaining durability compliance and improving aggregate-skeleton continuity.