Correct concrete load-bearing capacity and time limitations for the automatic implementation of monolithic reinforced ceilings

[摘要] Digital control, 3D technique and new materials show great potential in the automation ofconstruction processes. Simultaneously releasing humans from hard physical labour come improvements ofquality of workmanship and better resource and time management. In normal construction, vertical elements areerected robotically and horizontal (ceiling) elements are prefabricated. The “Stroptronic” technology presentedhere, tries to improve on that, introducing a “Just In Time” sequence of events on-site. The robot arranges allmaterials into a cycle and forms a monolithic, reinforced ceiling slab, sliding on a conveyor and rollers duringthe primary bonding of concrete. The concrete, based on a quick-setting cement composed with calcium sulfoaluminate (CSA); ensures the ceiling early self-bearing capacity thanks to its high early strength (over 20 MPa,1.5 hours after mixing). The robot constantly introduces reinforcements, prepares and extrudes the concrete mix,moving in a direction perpendicular to the ceiling span. Along with the robot, the conveyor and the rollers moveslowly under the ceiling, providing continuous support to the bonding concrete over a distance of about 1 m, i.e.until it reaches self-bearing capacity in the cross-section between the supports. Tests of the concrete with CSAare hereby produced, progress in bonding materials is analysed, along with results of testing load-bearingcapacity of a section with composite inserts (main bars – steel, distribution bars – fibreglass. Results andconclusions follow.

[学科分类] 建筑学

[关键词] automation of construction;Stroptronic;CSA cement