THE USE OF ADDITIVE TECHNOLOGIES IN THE CONSTRUCTION OF HIGH-RISE STRUCTURES

Additive manufacturing is emerging as a transformative approach for the rapid, resource-efficient erection of high-rise concrete structures. Conventional formwork-based methods incur substantial material waste (up to 60 %), prolonged construction cycles and heavy labor demands. This study evaluates extrusion-based 3D concrete printing (3DCP) and its integration with advanced simulation, robotics and inline quality control to overcome these constraints. First, the extrusion process is optimized by balancing pumpability and buildability: mixes with slump flows of 190–200 mm and controlled thixotropy ensure stable filament deposition at layer thicknesses of 8–12 mm, while compressed-air or screw-driven extruders maintain consistent flow rates and prevent air entrapment. Time-dependent rheology is managed through inline monitoring of shear strength, extending workable “open time” to 20–25 minutes under field conditions. Material modifications, including 0.5 % polypropylene fibers and 10 % fly-ash substitution, improve interlayer adhesion by 15 % and reduce micro-cracking, respectively. Mechanical behavior of printed elements is predicted using nonlinear finite-element models that incorporate time-evolving stiffness from 1 kPa up to 100 MPa within the first 24 hours. Calibration against laboratory shear-vanes and compression tests yields accurate forecasts of deformation (±5 % error) and stress distribution, supporting design of multi-story wall modules. Cooperative robotics, coordinated through BIM, further enhance precision: three-robot setups reduce peak bending moments by 67 %, support forces by up to 37 %, and positional deviations below ±3 mm, enabling the fabrication of complex vaults and free-form façades without temporary shoring. Economic analysis demonstrates that 3DCP can reduce material costs by 78 % and labor inputs by 60 %, achieving print rates up to 12 m³/h and producing a standard 3 × 3 m module in under 30 hours. When coupled with modular factory production of network-integrated panels, onsite assembly time drops from days to hours. Government incentives and dedicated research grants have accelerated pilot installations, yet the absence of unified standards for strength (≥ 30 MPa at 24 hours) and geometric tolerances (±5 mm) remains a critical barrier. To scale additive methods in vertical construction, it is vital to establish comprehensive process certifications, develop cementitious mixes with extended workability windows, refine multi-agent print planning algorithms, and conduct large-scale field trials. These steps will embed 3D concrete printing within building codes, ensuring its reliability, safety and widespread adoption in tomorrow’s urban skylines.