TY  - CONF
TI  - Digital optimization for green construction – reducing rebar waste and carbon emission
C1  - Singapore, Singapore
C3  - Proceedings of the 34th Annual Conference of the International Group for Lean Construction (IGLC 34)
SP  - 461
EP  - 472
PY  - 2026
DO  - 10.24928/2026/0169
AU  - Rizaldi, Yura Muhammad
AU  - Ashari, Akbar
AU  - Permadi, Adi
AU  - Putro, Bayu Anggoro
AU  - Thalib, Aminullah
AU  - Wirdianto, Anang
AD  - Junior Expert, Strategic Project Management Department, PT Wijaya Karya (Persero) Tbk., Jakarta, Indonesia, yura.mr@wikamail.id, orcid.org/0009-0004-8184-2003
AD  - Expert 1, Strategic Project Management Department, PT Wijaya Karya (Persero) Tbk., Jakarta, Indonesia, akbar.ashari@wikamail.id, orcid.org/0009-0009-4036-8313
AD  - Junior Expert, Strategic Project Management Department, PT Wijaya Karya (Persero) Tbk., Jakarta, Indonesia, adi.permadi@wikamail.id, orcid.org/0009-0009-6921-5046
AD  - Junior Expert, Strategic Project Management Department, PT Wijaya Karya (Persero) Tbk., Jakarta, Indonesia, bayu.ap@wikamail.id, orcid.org/0009-0001-7605-0579
AD  - Expert 1, Strategic Project Management Department, PT Wijaya Karya (Persero) Tbk., Jakarta, Indonesia, aminullah@wikamail.id, orcid.org/0009-0008-1031-1570
AD  - Expert 2, Strategic Project Management Department, PT Wijaya Karya (Persero) Tbk., Jakarta, Indonesia, anang.wirdianto@wikamail.id, orcid.org/0009-0004-9007-4747
ED  - Hamzeh, Farook
ED  - Poshdar, Mani
ED  - Garcia-Lopez,, Nelly P.
AB  - Reinforcing bar (rebar) is a major cost component and contributor to embodied carbon in reinforced concrete construction. In practice, rebar must be cut from standard stock lengths, and inefficient cutting plans often lead to material waste and disruptions in production flow. This study investigates how digital optimization of rebar cutting plans can reduce waste and support planning processes in construction projects. A case study approach was applied using QCDSMPE and quantified Ishikawa analysis to identify root causes, followed by the development and implementation of a digital optimization system across three pilot projects. The results show 2.4% reduction in rebar waste, corresponding to significant cost savings and an estimated reduction of 132,535 kgCO₂e. In addition, preparation time for cutting plans decreased from 3.7 hours to approximately 1s hour per Bar Bending Schedule (BBS). The findings demonstrate that digital optimization of material planning can improve resource efficiency, support workflow reliability, and contribute to both economic and environmental performance in construction.
KW  - Lean construction
KW  - Last Planner System
KW  - production flow
KW  - rebar cutting plan optimization
KW  - embodied carbon.
PB  - 
T2  - Proceedings of the 34th Annual Conference of the International Group for Lean Construction (IGLC 34)
DA  - 2026/06/22
CY  - Singapore, Singapore
L1  - http://iglc.net/Papers/Details/2481/pdf
L2  - http://iglc.net/Papers/Details/2481
N1  - Export Date: 19 June 2026
DB  - IGLC.net
DP  - IGLC
LA  - English
ER  -