炭素繊維補強の防火性能について

Abstract

Carbon fibers are one of the most effective materials for seismic strengthening. However fire endurance of strengthening with carbon fiber reinforced plastics (CFRP) should be taken into account because of its combustibility. This paper describes the several tests in accordance with methods of Japanese Industrial Standard; tensile strength tests of CFRP exposed with elevated temperature, residual tensile strength tests of CFRP exposed with elevated temperature, quasi-noncombustibility tests of CFRP and fire resistance tests of wall, column, column with wing walls and T-shaped beam specimens strengthened with CFRP. As the results of the tests, tensile strength of CFRP at 40 °C decreased to approximately 40-50 % of normal tensile strength. Residual tensile strength of CFRP had heated up to 200 °C were two-thirds of normal tensile strength. CFRP covered with a plaster board had quasinoncombustibility. For fire resistance, reinforced concrete members strengthened with CFRP maintained their functions during 2 hours. Reinforced concrete walls or slabs with CFRP penetrations maintained their functions during 2 hours.