TY  - CONF
TI  - New Model to Minimize Cost and Time of Rework Due to Prefabricated Construction Errors
AU  - Maalek, Reza
AD  - Junior-professor, and Chair for Digital Engineering and Construction, Institute of Technology and Management in Construction (TMB), Karlsruhe Institute of Technology (KIT), Germany, reza.maalek@kit.edu, orcid.org/0000-0001-6825-2691
ED  - Seppänen, Olli
ED  - Koskela, Lauri
ED  - Murata, Koichi
PY  - 2025
DA  - 2025/06/02
T2  - Proceedings of the 33rd Annual Conference of the International Group for Lean Construction (IGLC 33)
C3  - Proceedings of the 33rd Annual Conference of the International Group for Lean Construction (IGLC 33)
CY  - Osaka and Kyoto, Japan
SP  - 834
EP  - 845
DO  - 10.24928/2025/0297
SN  - 2789-0015 (ISSN)
AB  - The problem of minimizing the cost and time of rework due to fabrication and assembly errors in prefabricated construction considering the spatial relationship between elements was revisited. The time required to remedy the element’s error was used as the basis to find optimal crew sizing and scheduling to minimize rework. Using the modeled time, two formulations, namely, a mixed integer linear programming (MILP) and mixed integer quadratically constrained programming (MIQCP) were derived. The latter formulation captured the impact of crew occupied space on the available space for adjacent crews. Furthermore, the impact of uncertainty in the estimated time demand for each zone was incorporated through robust optimization. Finally, a new objective function term was included to balance work demand in each zone to approach takt time scheduling. The formulations were applied on a typical building construction project to correct the locations of reinforced concrete columns with assembly errors. While the formulations provide direct crew sizing and scheduling results, the methodology can benefit from: (i) incorporating flow continuity within zones; (ii) including multiple objectives to capture aspects, such as sustainability; and (iii) estimating the terms of the time demand model from real data.
KW  - Lean construction
KW  - mixed integer programming
KW  - crew sizing and scheduling
KW  - quality control
KW  - location-based scheduling.
L1  - https://www.iglc.net/papers/details/2438/pdf
UR  - https://www.iglc.net/papers/details/2438
DB  - IGLC.net
LA  - English
N1  - Export date: 04 October 2026
ER  -