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·¹¿Ã·ÎÁö Á¤¼ö¸¦ Ȱ¿ëÇÑ 3D Printing °ø¹ý Àû¿ëÀÌ °¡´ÉÇÑ ¸ð¸£Å¸¸£ÀÇ ÀûÃþ ¼º´É Æò°¡ / Evaluation of Buildability of Mortar for 3D Printing Applications Using Rheological Parameters |
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À̰Çõ(Lee, Kang-Hyeok) ; ÀÓ¿µÁÖ(Lim, Young-Ju) ; Çѵ¿¿±(Han, Dong-Yeop) ; ÀÌÀ¯Á¤(Lee, Yu-Jeong) |
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Çѱ¹°ÇÃà½Ã°øÇÐȸ ³í¹®Áý, Vol.25 No.1 (2025-02) |
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½ÃÀÛÆäÀÌÁö(33) ÃÑÆäÀÌÁö(12) |
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3Â÷¿ø ÇÁ¸°ÆÃ; ¸ð¸£Å¸¸£; ·¹¿Ã·ÎÁö; ÀûÃþ¼º; Á¡Åº¼º°è¼ö ; 3D printing; mortar; rheology; buildability; viscoelastic moduli |
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º» ¿¬±¸¿¡¼´Â 3D ÇÁ¸°ÆÃ °ø¹ý Àû¿ëÀÌ °¡´ÉÇÑ ¸ð¸£Å¸¸£ÀÇ ÀûÃþ ¼º´ÉÀ» ·¹¿Ã·ÎÁö Ư¼ºÀ» ±â¹ÝÀ¸·Î Æò°¡ÇÏ°í ¸ð¸£Å¸¸£ÀÇ ¾ÈÁ¤ÀûÀÎ ÀûÃþÀÌ °¡´ÉÇÒ ¶§ÀÇ ·¹¿Ã·ÎÁö Á¤¼ö ¹üÀ§¸¦ ºÐ¼®ÇϰíÀÚ ÇÏ¿´´Ù. ÀÌ¿¡ µû¶ó Flow Curve, Amplitude Sweep, Thixotropy µî ´Ù¾çÇÑ ·¹¿Ã·ÎÁö Á¤¼ö¸¦ Ȱ¿ëÇÏ¿© ¸ð¸£Å¸¸£ÀÇ ÀûÃþ¼º°úÀÇ »ó°ü°ü°è¸¦ ºÐ¼®ÇÏ¿´´Ù. ¿¬±¸ °á°ú ±âÁ¸ ¿¬±¸¿¡¼ 3D ÇÁ¸°ÆÃ¿ë ½Ã¸àÆ® °è¿ Àç·áÀÇ ¹°¼º ¹× ¼º´É Æò°¡¿¡ ÁÖ·Î »ç¿ëÇÏ´ø Bingham Model ½Ä ±â¹ÝÀÇ Ç׺¹ÀÀ·Â°ú ¼Ò¼ºÁ¡µµ´Â ¾Ð Ãâ°ú ÀûÃþÀÌ °¡´ÉÇÏ´õ¶óµµ ¹èÇÕ¿¡ µû¶ó ¸Å¿ì À¯µ¿¼ºÀÌ ³·Àº °æ¿ì ÃøÁ¤ÀÌ ºÒ°¡´ÉÇÏ¿© Àç·áÀÇ ¼º´É Æò°¡¿¡ ÇѰ谡 ÀÖÀ½À» ¾Ë ¼ö ÀÖ¾ú´Ù. 3D ÇÁ¸°ÆÃ¿ë ½Ã¸àÆ® °è¿ Àç·áÀÇ ¼º´ÉÀ» ·¹¿Ã·ÎÁö °üÁ¡¿¡¼ Æò°¡ÇϰíÀÚ ÇÒ ¶§ Àç·áÀÇ Á¡Åº¼º °Åµ¿À» Æò°¡ÇÒ ¼ö ÀÖ´Â Amplitude Sweep Test¸¦ Ȱ¿ëÇÏ´Â °ÍÀÌ °¡Àå ÀûÇÕÇÒ °ÍÀ¸·Î ÆÇ´ÜµÈ´Ù. ƯÈ÷ Àç·á°¡ Á¡Åº¼º ±ÕÇüÀû »óÅÂÀÏ ¶§ °¡Àå ¿ì¼ö ÇÑ ÀûÃþ ¼º´ÉÀ» È®º¸ÇÏ´Â °ÍÀ» È®ÀÎÇÏ¿´´Ù. º» ¿¬±¸¸¦ ÅëÇØ 3D ÇÁ¸°ÆÃ Àû¿ëÀÌ °¡´ÉÇÑ ½Ã¸àÆ® °è¿ Àç·áÀÇ ¼º´É Æò°¡¿¡ ´Ù¾ç ÇÑ ·¹¿Ã·ÎÁö Á¤¼ö¸¦ °í·ÁÇϸé Á¤È®Çϰí Á¤·®ÀûÀÎ Æò°¡°¡ °¡´ÉÇÒ °ÍÀ¸·Î ÆÇ´ÜµÈ´Ù. |
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This investigation systematically evaluates the buildability characteristics of cementitious mortars designed for additive manufacturing applications through the establishment of quantitative correlations between rheological parameters and buildability performance metrics. A comprehensive rheological characterization protocol was implemented, encompassing flow curve analyses, oscillatory amplitude sweep measurements, and time-dependent thixotropic behavior assessments to elucidate the material¡¯s complex rheological response. While extant literature has predominantly relied on Bingham model parameters?specifically yield stress and plastic viscosity?for material characterization, this research demonstrates the inherent limitations of these metrics in evaluating low-fluidity mixtures that exhibit satisfactory extrudability and buildability characteristics. The experimental findings reveal the inadequacy of conventional rheological parameters when applied in isolation, particularly in the context of additive manufacturing applications. Notably, oscillatory amplitude sweep measurements emerged as a superior analytical technique for characterizing the viscoelastic behavior of printable mortars, demonstrating that optimal layer-stacking performance correlates with specific viscoelastic regimes characterized by well-defined storage and loss moduli ratios. These empirical observations underscore the imperative for developing a more sophisticated rheological assessment framework that integrates multiple characterization techniques to accurately predict and optimize the performance of 3D-printable cementitious materials in construction-scale additive manufacturing applications. |