Abstract
This experimental research highlights the applicability of laser cutting to cement-based materials using multimode fiber lasers. A 9 kW multimode fiber laser is used, and the experimental variables are the water-to-cement ratio, laser speed, and material compositions such as cement paste, cement mortar and ultra high performance concrete (UHPC). The laser cutting performance on the cement-based materials is investigated in the downward laser direction. The kerf width and penetration depth of the cement-based materials are quantitatively evaluated with the parameters in the surface and cross section of the specimens after the laser cutting. Moreover, the material removal zone of each specimen is compared in terms of the penetration shapes in the cross-sectional view. Based on experimental observations, the interaction mechanism between the laser and cement-based materials is proposed.
Highlights
The demand for concrete fabrication is steadily increasing, especially in the area of concrete cutting employed in architectural renovation projects involving existing concrete structures, as well as in the demolition of nuclear power plants
Moon et al [1] reported that the performance to confirm whether the computer-aided design (CAD) based path planner could be fulfilled in the remote control of concrete surface grinding
Before analyzing the kerf width of each specimen in accordance with the laser cutting speed, Before analyzing the kerf width of each specimen in accordance with the laser cutting speed, the the top view of the cement-based materials was observed after the laser irradiation
Summary
The demand for concrete fabrication is steadily increasing, especially in the area of concrete cutting employed in architectural renovation projects involving existing concrete structures, as well as in the demolition of nuclear power plants. Conventional material removal methods, such as waterjet cutting and diamond blade cutting, are still mostly used for concrete processing. Skarabis and Stöckert [2] used diamond grinding to optimize the noise emission reduction of concrete pavement surfaces. Investigated the applicability of using drill cuttings in concrete to produce cost-effective material. Drill cutting is applicable for use in controlled low strength material (CLSM) as well as similar non-structural applications. The waterjet cutting method can be used to cut most cement-based materials, the method can be implemented only with limited power, leading to long operation times; in addition, the method generates unwanted contaminated wastewater. Diamond blade cutting causes micro-fracturing of the concrete because of vibration, thereby resulting in unnecessary removal of concrete
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