Marine mass concrete mixture for floating structures is derived that can minimize heat of hydration and several construction methods are investigated to reduce thermal cracks. Analysis variables are type and amount of mineral admixtures, number of lifts and placing interval. Probability of thermal crack occurrence is evaluated.

A series of tests on the bond characteristics between new and old concrete were carried out. Main test variables are type and amount of mineral admixtures, treatment method of the interface and type of waterstops. The test results showed a slightly increased bond strength when applying mineral admixtures and the interface was treated rough and dry.

본 연구는 한강유역 중소하천 계획하폭 산정공식을 결정하기 위하여 216개 구간의 중소하천에서의 계획홍수량, 유역면적, 하상경사, 실제하폭을 수집한 후, 1) 최소자승법(least squares, LS), 2) 최소중간치자승법(least median squares, LMS) 및 3) 재가중최소자승법(reweighted least squares, RLS)을 이용하여 경험적인 계획 하폭 공식을 결정하였다. 한강유역에서의 기존하폭 산정공식과 비교하기 위하여 계