The performance of pulsed laser irradiation on concrete have been investigated in the downward and upward laser direction of incident laser beam. The mechanism of material removal without assist gas is dominated by vaporization and melt expulsion induced by recoil pressure evaporation. Also, the melt concrete ejection is greatly enhanced by gas bubbles expansion and breakup. Performance of pulsed laser irradiation on concrete is significantly enhanced in the upward direction by the assistance of gravity. In addition, the pulsed laser parameter can be varied to control the quality and performance of laser drilling and cutting concrete.
REFERENCES
1.
Rao
B T
, Kumar
H.
, Nath
A K
(2005
) Processing of concretes with a high power CO2 laser
, Optics & Laser Technology
37
348
–356
.2.
Lawrence
J
and Li
L
(1999
) Suface grazing of concrete using a 2.5 kW high power diode laser and the effect of large beam geometry
, Optics & Laser Technology
31
583
–591
.3.
Yoshizawa
H
, Wignarajah
S
, Saito
H
(1989
) Study on laser cutting of concrete
, Trans. Of the Japan Welding Society
, Vol. 20
, No. 1
.4.
Kazuyoku
Tei
et. al. (2006
) Concrete cutting using high power fiber laser
, Proc. of SPIE
, vol. 6101
, 61011T
.5.
Sevon
T
et. al. (2005
) Molten Core-Concrete Interactions in Nuclear Accidents
, Espoo VTT Process- Research Notes
2311
, 83
,6.
I.
Hager
et. al. (2013
), Behaviour of cement concrete at high temperature
, Bull. Pol. Ac.: Tech.
vol. 61
, No. 1
.7.
Semak
V
and Matsunawa
A.
(1997
), The role of recoil pressure in energy balance during laser materials processing
, J. Appl. Phys.
30
2541
–2552
.
This content is only available via PDF.
© 2016 Laser Institute of America.
2016
Laser Institute of America
You do not currently have access to this content.