Concrete construction carries a heavy environmental burden and is constrained by conventional formwork, limiting geometrically efficient designs. Structural optimization methods, such as topology, shape, and form-finding, have emerged to improve material efficiency by aligning form with load paths, yet their practical application has been restricted because optimized geometries often prove difficult to build without simplification.
Meanwhile, robotic concrete fabrication routes such as 3D printing, printed formwork, shotcrete, and controlled casting offer new geometric freedom but introduce specific process constraints.
Previous studies have addressed optimization and digital fabrication largely in isolation, leaving knowledge fragmented across disciplines. This paper filled that gap through a systematic, PRISMA-based review that synthesizes fabrication-aware workflows linking structural optimization to robotic concrete construction.
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Literature Search and Analytical Framework
This study employed a structured, PRISMA-based systematic review methodology to examine the intersection of structural optimization and robotic concrete construction. The literature search was conducted across Scopus and Web of Science for the period 2015–2025, a period that saw rapid expansion in robotic fabrication and fabrication-aware design research.
Four keyword groups, namely, robotic systems, production method, material, and application domain, were combined using Boolean operators to capture relevant studies. After removing duplicates, 107 unique records remained. Screening excluded two pre-2015 studies, one inaccessible full text, and three editorial forewords, yielding a final corpus of 101 publications, of which 90 research articles formed the analytical dataset.
Data extraction involved full-text review and manual coding across canonical categories, including year, country, fabrication route, optimization strategy, validation method, software tools, and performance metrics. To ensure consistency, varied author terminology was mapped to harmonized labels, and ambiguous assignments were cross-checked against previously coded records.
Multi-label studies were handled through normalized weighting, where each study received a total weight of one per category, distributed equally across reported labels to prevent over-representation in aggregated distributions.
This structured coding enabled three analytical outputs: temporal publication trends, geographic concentration, and cross-tabulations of countries against validation and fabrication approaches, as well as weighted distributions with co-occurrence heatmaps examining relationships among optimization, software, and fabrication.
Quantitative outcomes were extracted as reported, without imputation, and substantial heterogeneity in performance metrics precluded formal meta-analytical aggregation, restricting analysis to descriptive synthesis.
Key Findings and Thematic Synthesis
Geographically, publication output remains concentrated, with Germany, Switzerland, and the United States leading contributions, while broader international representation remains limited. Cross-tabulations show that experimental and prototype-based validation dominate across most leading countries, with simulation-only approaches remaining comparatively secondary.
Regarding fabrication routes, robotic 3D concrete printing by extrusion is the dominant method in the reviewed literature, followed by 3D-printed formwork and hybrid processes, while shotcrete-based manufacturing and controlled casting systems remain less frequently explored.
Optimization strategies are led jointly by shape optimization and parametric/generative approaches, with topology optimization also strongly represented, whereas artificial intelligence (AI) and data-driven methods appear only marginally, indicating the field’s continued reliance on established computational design paradigms rather than emerging machine learning techniques.
Validation is predominantly conducted at the laboratory scale, with full-scale structural validation remaining the least-represented category, highlighting a gap between prototype demonstrations and construction-ready evidence.
Software distributions reveal a pronounced dominance of the Rhino-Grasshopper ecosystem, supplemented by Karamba3D for structural analysis and KUKA|prc for robotic control, while Python plays a consistent supporting role in evaluation, integration, and custom computation.
Co-occurrence analyses confirm that parametric/generative and shape optimization align most strongly with robotic 3D concrete printing, whereas topology optimization appears less broadly distributed but shows meaningful associations with robotic 3D concrete printing and hybrid fabrication workflows.
Across all routes, design-to-fabrication workflows are consistently iterative rather than linear, with fabrication constraints actively reshaping upstream geometry rationalization, toolpath planning, and structural validation.
However, reinforcement integration and quality control remain persistent bottlenecks, with two dominant strategies emerging: post-definition reinforcement accommodation in formwork-based routes and reinforcement-as-scaffold approaches, where reinforcement defines geometry from the outset.
Sensing and feedback-driven automation is increasingly positioned to stabilize execution through in-process monitoring and corrective control, though most systems remain confined to the execution layer rather than feeding back into upstream design decisions: a key frontier for future adaptive workflows.
Toward Integrated Fabrication Workflows
This review demonstrates that structural optimization has practical significance in robotic concrete construction only when tightly integrated with fabrication logic, reinforcement strategies, and process control from the earliest design stages.
Across 90 analyzed studies, fabrication routes function not merely as production choices but as workflow organizers that actively reshape geometry rationalization, toolpath planning, and validation.
While early integration of fabrication constraints improves buildability and material efficiency, reinforcement integration and quality control remain persistent bottlenecks separating prototypes from reliable structural applications. The findings underscore that route selection is a strategic decision about where complexity and risk are positioned within the workflow.
Looking forward, the field's progress depends on developing adaptive, evidence-driven workflows where sensing and feedback inform upstream design decisions, enabling fabrication systems that respond to real process behavior rather than executing fixed scripts.
Journal Reference
Alaçam, S., et al. (2026). Structural Optimization for Robotic Concrete Construction: A Systematic Review. Applied Sciences. 16(12). https://www.mdpi.com/2076-3417/16/12/6070.
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