Abstract
After prolonged service, concrete surfaces can develop a range of issues such as cracking, spalling, scaling, delamination, and contamination. Meanwhile, laser scabbling can be used as an advanced method for removing concrete surface defects. Besides, the downward direction is still mainly used in the scabbling process and variation in inclination angles of the laser beam has not been investigated in the laser scabbling process. In this study, nanosecond laser scabbling on Ultra-High Performance Concrete (UHPC) with different angles of the sample was carried out. The change in sample angle leads to changes in laser beam shape and the laser intensity distribution in the processing zone. The surface morphology and depth of the glassy layer were revealed by using a 3D Confocal Microscope corresponding to different incident angles of the laser beam. Moreover, a Scanning Electron Microscope (SEM) was also used to examine the pore size distribution in the glassy layer and heat-affected zone as compared to the non-processed zone. The molten material moved easily during the laser scabbling process as the inclination of the sample increased, causing the pores in the molten zone to collide and form a larger size.
Published Version
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