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Evaluation of pulsed laser irradiation on concrete using a QCW laser system

Nguyen, P. L.; Daido, Hiroyuki; Matsunaga, Yukihiro; Hanari, Toshihide ; Terada, Takaya; Yamada, Tomonori; Kawachi, Tetsuya

Laser irradiation techniques for removing degraded parts of concrete structure such as tunnel's concrete of railways safely and efficiently is an urgent task, since the significant defects in wall concrete have been detected in the JR West tunnels, Japan. In this work, the characteristic of hole drilled into concrete and the material removal mechanism corresponding to the temperature of surface concrete during laser drilling were investigated by using high speed camera and thermography. The QCW (Quasi continuous wave) fiber laser system having compact dimensions was used in this experiment allowing for a maximum peak power of 1.5 kW and average power of 150 W, operating at 1070 nm. Results show that the melt concrete is removed from the interaction zone both in vapor and melt liquid state. Also the melt concrete expulsion has a significant effect of variation in peak power and pulse duration. In addition, the penetration depth was achieved on 20 mm thick with peak power of 1600 W within 10 s. This basic study of pulsed laser drilling provides useful information to control and enhance the performance for laser irradiation on concrete.

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