23,000㎥ 대용량 바닥슬래브 콘크리트의 시공기술

This research investigates the actual data and construction technology of the massive bottom slab placed by 23,000㎤ concrete quantity in site of the in-ground type LNG receiving terminal having 200,000kl storage capacity. The purpose of this study is to determine the optimum mix design and control the actual concreting procedures including concrete production, transportation, placement, vibrating and curing in site. For this purpose, the optimum mix design using ternary blended cement(furnace slag cement + fly ash) and under piping method having 11 gates and 7 distributors are selected.As test results of actual construction, concrete placement is finished during 68hours with good success and obtained the good quality of the fresh and hardened concrete including slump, air contents, no-segregation, compressive strength and low hydration heat. Also, actual data for all of concrete procedures are proved successful and satisfied with our specifications.