Consideration on the Crack Control of Steel Bridge Deck Slabs by Using Expansive Concrete

-Follow-up Study of Nagasaki Expressway's Kuroishihama Bridge (Isahaya IC No.4 Bridge)-

Abstract

Due to its effectiveness in construction, expansive concrete was applied as a measure to prevent further crack damage in the highway bridge reinforced concrete deck slabs of the Kuroishihama Bridge along the Nagasaki Expressway. Expansion, drying shrinkage, and conditions of crack production of the concrete deck slabs were investigated over a two year period. Results are summarized here. Consequently, it was confirmed that expansive concrete deck slabs crack less than those of normal concrete and have the strength to withstand loads. An explanation on the causes of cracking is added based on results obtained from durability inspections and endurance tests.