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Open AccessArticle

Microstructural Characteristics of Cement-Based Materials Fabricated Using Multi-Mode Fiber Laser

1
Department of Mechanical and Automotive Engineering, Kongju National University, Cheonan 31080, Korea
2
School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(3), 546; https://doi.org/10.3390/ma13030546
Received: 29 December 2019 / Revised: 17 January 2020 / Accepted: 22 January 2020 / Published: 23 January 2020
(This article belongs to the Special Issue Advanced Design for Manufacturing Processes)
Cement-based materials are the most prevalent construction materials, and the conventional cutting techniques are still mostly used for fabricating the materials. However, these conventional cutting methods could generate undesirable micro-cracks and remove unintentional structural sections. This experimental study aims to evaluate the effects of the new fabricating method using laser on the microstructural characteristics of the cement-based materials. The experimental variables are laser cutting speed, water to cement ratio and material compositions. In order to compare the microstructure before and after the laser interaction, the microstructure of the cut surface is observed through scanning electron microscopy/energy dispersive X-Ray (SEM/EDX). After the laser interaction, the Material Removed Zone (MRZ) and Heat Affected Zone (HAZ) are observed on the cut surface. In MRZ, it is found that the glassy layer is thickened by an increasing amount of silicate-based materials in cement-based materials. In addition, it concluded that the amount of silicate-based material mixed in the cement-based materials affects the laser cutting quality. View Full-Text
Keywords: cement-based materials; laser cutting; multi-mode fiber laser; microstructure; SEM/EDX analysis cement-based materials; laser cutting; multi-mode fiber laser; microstructure; SEM/EDX analysis
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Seo, Y.; Lee, D.; Pyo, S. Microstructural Characteristics of Cement-Based Materials Fabricated Using Multi-Mode Fiber Laser. Materials 2020, 13, 546.

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