長期材齢コンクリ-トの調査研究-19-昭和初期の学校建築および公会堂

概要

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Investigations were carried out on the deterioration of three reinforced concrete bui1dings built in 1927 and 1930. They are 10cated in Hokuriku district of centra1 Japan. The investigation revea1ed crack distribution， degree of carbonation of concrete and corrosion of reinforcing bars. In a ha1f century the bui1dings came to the state as fo11ows 1) The deterioration is manifested most significant1y at the tip of eaves. Mortar and cover concrete disappeared and reinfor-cing bars are corroded severe1y. 2) Some roof slabs and f100r slabs show cracks at their underside， indicating the corrosion of reinforcing bars. 3) Outside wal1 finishment cal1ed "Araidashi" is proved to be very effective for keeping the concrete from the carbonation. 4) At the inside co1umns and wal1s， finished with p1aster， carbo-nation thickness of the concrete are about 6 cm and larger than the thickness of cover concrete for the reinforcing bars. There is， however， no crack affecting the structura1 capabi1ity of the bui 1ding. The investigation resu1ts revea1ed the importance of outer finishment for the durability of reinforced concrete bui1ding especia11y in Hokuriku district， characterized with much snow and rein which provide the condition accelarating steel corrosion. Some information on the corre1ation between the carbonation depth and the steel corrosion were also obtained by the investigation.
福井大学工学部の論文