Optimalisasi Waktu dan Biaya dengan Metode Time Cost Trade Off Pada Proyek Konstruksi Jalan
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Summary
This study addresses the challenge of project delay in the construction of the Lubuk Alung–Kuraitaji road widening project in Padang Pariaman, Indonesia. The project, originally scheduled for 150 calendar days with a budget of Rp. 83.6 billion, experienced a performance deviation of -7.091% by the 16th week. Earned Value Management (EVM) analysis revealed that the projected total duration had extended to 170 days, resulting in a 20-day delay. The research aims to optimize time and cost by applying the Time Cost Trade Off (TCTO) method to accelerate critical path activities and restore the project schedule to the contractual duration. The methodology involved a seven-stage process utilizing Microsoft Project 2016. First, the normal schedule and EVM metrics were established. Tracking data from weeks 1–16 confirmed the delay, with a Schedule Performance Index (SPI) of 0.7 and a negative Schedule Variance (SV) of Rp. 17.4 billion, indicating poor schedule performance. To mitigate this, the study identified critical path activities and evaluated two acceleration alternatives: adding overtime hours (4-hour shifts) and adding work shifts. The analysis calculated the cost slope for each activity to determine the most cost-effective crashing strategy, comparing direct and indirect costs for both alternatives. The results demonstrated that both alternatives could reduce the project duration from 170 days back to the contractual 150 days. However, the incremental costs differed significantly. The overtime alternative incurred a direct acceleration cost of Rp. 1,676,510,600.23. In contrast, the additional work shift alternative required a direct acceleration cost of only Rp. 307,721,835.60. Consequently, the work shift alternative was selected as the optimal solution due to its substantially lower incremental cost and higher efficiency. The study confirms that while acceleration increases total project costs, selecting the method with the lowest cost slope on critical activities minimizes financial impact. The significance of this research lies in its practical application of TCTO for resolving construction delays. It highlights the importance of integrating EVM for early detection of schedule deviations and using systematic crashing techniques to recover time. The findings provide a clear framework for project managers to choose between overtime and shift work based on cost slope analysis, ensuring that schedule recovery is achieved with minimal budget overrun. This approach supports efficient project control mechanisms in complex engineering projects where time and cost constraints are critical.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-06-25 |
| archive | success | canonical_url | — | — | 1 | 2026-06-26 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-25 |
| chunk | success | chunk | — | — | 1 | 2026-06-25 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-25 |
| promote | success | — | — | — | 1 | 2026-06-25 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-25 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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