LAUSR

Construction activities consume a lot of energy and produce emissions which damage the environment. Furthermore, bridge construction is one of the infrastructure buildings which consume the largest amount of energy due to the materials, transportation, and heavy equipment used in the process. It is, however, important to reduce the energy consumed at each stage of the construction in order to ensure a decrease in the environmental impacts. This study was conducted to calculate the total energy consumed in a bridge project and the process was optimized to reduce the amount of energy used in the initiation, design, construction, and operation activities. Data were collected through observations of 3 bridge projects in the Central Java region, Indonesia. Furthermore, a reinforced concrete type of bridge was used and the amount of energy at each stage was determined by multiplying the volume of materials, electricity, and fuel used with the energy coefficient. The results showed the total energy generated in bridge projects 1, 2, and 3 was 21,870,543.14 MJ, 16,616,641.09 MJ, and 8,753,712.69 MJ. These values were decreased by 6.55%, 8.73%, and 3.45% respectively after optimization. This means the optimization process was able to effectively minimize the energy used in each activity of the project and also has a positive impact on the implementation of green construction, especially for bridge projects.