Search

Few studies on crew productivity has been conducted, although the data is significant for time and cost estimation. Crew productivity data was collected for over 9 months from a nuclear power plant and analysed in order to identify factors driving the productivity. It was revealed that the crew productivity of form work and rebar work was 45.64(), 2.93() on average respectively. The study also found that 'nightwork' and 'total work amount completed' were identified as drivers for the both works. Moreover, 'complexity of daywork' can lead to crew productivity deduction of about 77% for form-work and 81% for rebar-work. The productivity data collected and factors affecting the productivity will help managers to plan and control their similar works. This study will also be beneficial for those performing related studies.

Korea has been promoting green-roof related industry with a great efforts, which leads many researchers to study and develop technology of economical and lightweight green-roof system. In this study, the industrial waste of 'Bottom Ash' produced inevitably from thermal power generation was researched in order to examine the possibility of using it as material for lightweight vegetative block for an economical and lightweight green-roof system. A production manual of the block containing material selection and delivery, mixing, maintenance; and a construction manual of the system are also proposed. From a study of two test-beds of the system, it was revealed material cost as well as maintenance efforts could be saved. Moreover, the system is believed to be a very environment friendly since the system is utilizing industrial waste. Findings from the study will be a great interest of the industry. This study will also be beneficial for those performing related studies.

VE(Value Engineering) is believed to be a very powerful tool for quality improvement and schedule reduction of a project as well as for cost savings. However, little of small and medium size construction companies adopt the VE into their projects, particularly those in private sector. The main reason is that the VE is commonly misunderstood to be complex and sophisticated process, thus it is only applicable for large and difficult projects. VE applied into two small and medium scaled private projects from design phase to construction phase in order to verify advantages of the tool and find the most optimized process of it. As a result, a P university project experienced a considerable reduction on construction cost by changing a construction method of its ground works and sizes of H-beams. In addition, a H motor exhibition hall project also achieved time and cost savings. It was also revealed that, for better application of the VE on a small and medium size project, building trust between owner and contractor is prerequisite. VE skill can be taken full advantage by all the small and medium scale enterprises, which will surely lead to a huge progress of the construction business.