Lee, Hojae
(Korea Institute of Civil Engineering and Building Technology)
,
Kim, Jang-Ho Jay
(School of Civil and Environmental Engineering, Yonsei University)
,
Moon, Jae-Heum
(Korea Institute of Civil Engineering and Building Technology)
,
Kim, Won-Woo
(Korea Institute of Civil Engineering and Building Technology)
,
Seo, Eun-A
(Korea Institute of Civil Engineering and Building Technology)
Abstract Recently, researches on additive manufacturing (AM) method have been actively carried out as the latest technique for building concrete structures in the construction field. It is known that the additive manufacturing method, also called 3D printing technique, is a method of constructing a...
Abstract Recently, researches on additive manufacturing (AM) method have been actively carried out as the latest technique for building concrete structures in the construction field. It is known that the additive manufacturing method, also called 3D printing technique, is a method of constructing a structure by printing layers, and the adhesion strength in the interlayer between the layers plays a dominant role in the performance of the structure. In this study, we focused on the formation of interlayer of concrete structure built using additive manufacturing method. In this study, the position of the interlayer was analyzed using the computed tomography (CT) method and the correlation between porosity and tensile bond strength in the analyzed interlayer was tried. As a result of the CT analysis of 13 specimens extracted from the printed specimens, it was confirmed that the porosity was formed high in the interlayer. The porosity of the interlayer was at least 2.15% and 6.66% higher than the average porosity. After analyzing the porosity by CT, the tensile bond strength of the specimens was measured to confirm the tensile bond strength and location of the fracture surface. Tensile bond strengths were 2.58–3.77 MPa with an average of 2.80 MPa using 10 specimens. It was confirmed that all of the fracture surfaces occurred along the interlayer. It was confirmed that there was no correlation between the tensile bond strength and porosity of the test specimens used in this study. Six of the ten specimens failed in the other interlayer, but four specimens failed in the interlayer with the highest porosity. As a result of analysis of the fracture surfaces of six specimens without fracture at the highest porosity, the porosity at the fracture surface was 5.73–9.18%, which was higher by 0.6–3.3% than the average porosity. However, defects occurred during layer output were confirmed from the failure of six specimens. Through this study, we confirmed that the interlayer is the weakest when tensile stress is applied in the perpendicular direction of printing, and that it is necessary to review the defects when applying the printing method. Highlights Pore distribution in the interlayer analyzed using X-ray Computed Tomography. Relationship between pore fraction and position of tensile bond fracture determined. Tensile bond strength of 6.27% of compressive strength obtained. Weakest layer occurred when tensile stress is perpendicular to printing direction.
Abstract Recently, researches on additive manufacturing (AM) method have been actively carried out as the latest technique for building concrete structures in the construction field. It is known that the additive manufacturing method, also called 3D printing technique, is a method of constructing a structure by printing layers, and the adhesion strength in the interlayer between the layers plays a dominant role in the performance of the structure. In this study, we focused on the formation of interlayer of concrete structure built using additive manufacturing method. In this study, the position of the interlayer was analyzed using the computed tomography (CT) method and the correlation between porosity and tensile bond strength in the analyzed interlayer was tried. As a result of the CT analysis of 13 specimens extracted from the printed specimens, it was confirmed that the porosity was formed high in the interlayer. The porosity of the interlayer was at least 2.15% and 6.66% higher than the average porosity. After analyzing the porosity by CT, the tensile bond strength of the specimens was measured to confirm the tensile bond strength and location of the fracture surface. Tensile bond strengths were 2.58–3.77 MPa with an average of 2.80 MPa using 10 specimens. It was confirmed that all of the fracture surfaces occurred along the interlayer. It was confirmed that there was no correlation between the tensile bond strength and porosity of the test specimens used in this study. Six of the ten specimens failed in the other interlayer, but four specimens failed in the interlayer with the highest porosity. As a result of analysis of the fracture surfaces of six specimens without fracture at the highest porosity, the porosity at the fracture surface was 5.73–9.18%, which was higher by 0.6–3.3% than the average porosity. However, defects occurred during layer output were confirmed from the failure of six specimens. Through this study, we confirmed that the interlayer is the weakest when tensile stress is applied in the perpendicular direction of printing, and that it is necessary to review the defects when applying the printing method. Highlights Pore distribution in the interlayer analyzed using X-ray Computed Tomography. Relationship between pore fraction and position of tensile bond fracture determined. Tensile bond strength of 6.27% of compressive strength obtained. Weakest layer occurred when tensile stress is perpendicular to printing direction.
Constr. Build. Mater. Li 170 520 2018 10.1016/j.conbuildmat.2018.03.028 A predictive model of the effective tensile and compressive strengths of concrete considering porosity and pore size
Constr. Build. Mater. Zhang 163 402 2018 10.1016/j.conbuildmat.2017.12.111 Effect of pore structures on gas permeability and chloride diffusivity of concrete
Constr. Build. Mater. Li 147 79 2017 10.1016/j.conbuildmat.2017.04.136 Mesoscopic damage model of concrete subjected to freeze-thaw cycles using mercury intrusion porosimetry and differential scanning calorimetry (MIP-DSC)
J. Mar. Sci. Technol. Cho 20 269 2012 10.51400/2709-6998.1803 Using mercury intrusion porosimetry to study the interfacial properties of cement-based materials
Sci. World J. Zhao 247058 2014 Influence of pore structure on compressive strength of cement mortar
J. Adv. Concr. Technol. Darma 11 266 2013 10.3151/jact.11.266 Application of x-ray CT to study diffusivity in cracked concrete through the observation of tracer transport
Constr. Build. Mater. Sanjayan 172 468 2018 10.1016/j.conbuildmat.2018.03.232 Effect of surface moisture on inter-layer strength of 3D printed concrete
Constr. Build. Mater. Shakor 138 398 2017 10.1016/j.conbuildmat.2017.02.037 Modified 3D printed powder to cement-based material and mechanical properties of cement scaffold used in 3D printing
Mater. Lett. Panda 209 146 2017 10.1016/j.matlet.2017.07.123 Anisotropic mechanical performance of 3D printed fiber reinforced sustainable construction material
Autom. Constr. Zareiyan 83 212 2017 10.1016/j.autcon.2017.08.019 Effects of interlocking on interlayer adhesion and strength of structures in 3D printing of concrete
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