Comparison Analysis Of Cost and Time Between Aluminum Formwork and Semi - System Formwork on Wall (Case study: RSS Building MRTJ Station, Central Jakarta)

Abstract

Formwork is one of the most resource intensive components in reinforced concrete construction, often contributing significantly to both project cost and duration. The efficiency of a construction project is therefore closely related to the selection of an appropriate formwork system. As formwork plays a critical role in determining the timeline and budget of construction projects, selecting the appropriate method is essential for project optimization. This study aims to compare the cost and time efficiency of aluminium formwork and semi-system formwork in wall construction. The research is based on a case study of the RSS Building at the MRT Jakarta Station, Central Jakarta. The methodology involves a comparative quantitative approach using both primary data from field observations and interviews, as well as secondary data from project documentation and prior studies. Cost calculations include production, installation, and rental components, while time efficiency is measured through man-day analysis. Labour productivity coefficients, especially for aluminium formwork, were adopted from existing research to ensure accurate and standardized comparison. The results indicate that aluminium formwork offers greater efficiency, with a total cost of Rp 591,678,031.53 compared to Rp 976,997,040.88 for semi-system formwork. Additionally, aluminium formwork demonstrates better performance in reducing execution time due to its modularity and reusability. Therefore, aluminium formwork is recommended for large-scale projects and should be considered in future construction planning and national standards.