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Jae-Heum Moon
Korea Institute of Civil Engineering and Building Technology, Daehwa-Dong, Goyang-Si, Gyeonggi-Do 10223, Korea

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Journal article
Published: 08 December 2019 in Materials
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The mechanical properties of 3D-printed mortars are determined in terms of their compressive and direct tensile bond strengths. To determine such properties using existing methods, a preliminary experiment was conducted. The compressive strength of the printed mortar was compared to mold-casted specimens and it was found that the compressive strength decreased by ~30%. Among the fabrication variables, an increase in nozzle height negatively influenced the direct tensile bond strength. For the same conditions and age, the direct tensile strength decreased by as much as 16–29% when the number of layers increased from 2 to 6. When the specimens were fabricated using a specially designed stainless steel frame and core drill, followed by extraction and the application of physical impact, the 28 days compressive strength of the specimen decreased by ~50%.

ACS Style

Hojae Lee; Jang-Ho Jay Kim; Jae-Heum Moon; Won-Woo Kim; Eun-A Seo. Evaluation of the Mechanical Properties of a 3D-Printed Mortar. Materials 2019, 12, 4104 .

AMA Style

Hojae Lee, Jang-Ho Jay Kim, Jae-Heum Moon, Won-Woo Kim, Eun-A Seo. Evaluation of the Mechanical Properties of a 3D-Printed Mortar. Materials. 2019; 12 (24):4104.

Chicago/Turabian Style

Hojae Lee; Jang-Ho Jay Kim; Jae-Heum Moon; Won-Woo Kim; Eun-A Seo. 2019. "Evaluation of the Mechanical Properties of a 3D-Printed Mortar." Materials 12, no. 24: 4104.

Journal article
Published: 31 October 2019 in Applied Sciences
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This study aimed to investigate the potential use of carbon nanotubes (CNTs), which are an innovative construction material preferred by many researchers. Long-term microstructure enhancement and on-site application are major reasons to conduct research on CNT-cement composites; thus, a study on mechanical properties as well as the thermal conductivity of CNT-cement composites was carried out. As the CNT content increased, the thermal conductivity of CNT-cement composites was also enhanced. In addition, a couple of microstructure analyses such as isothermal calorimetry, thermal gravimetric analysis and SEM-EDS (Scanning Electron Microscope-Energy Dispersive X-ray Spectroscopy) for observing hydration reaction rate and types of hydration products were conducted to establish the advantage of CNT use in cement composites. Strength development of CNT-cement composites at early ages was slow, although eventually CNTs containing water developed equivalent level of strengths at last as internal curing effects.

ACS Style

Sang-Hwa Jung; Sungwoo Oh; Sung-Wook Kim; Jae-Heum Moon. Effects of CNT Dosages in Cement Composites on the Mechanical Properties and Hydration Reaction with Low Water-to-Binder Ratio. Applied Sciences 2019, 9, 4630 .

AMA Style

Sang-Hwa Jung, Sungwoo Oh, Sung-Wook Kim, Jae-Heum Moon. Effects of CNT Dosages in Cement Composites on the Mechanical Properties and Hydration Reaction with Low Water-to-Binder Ratio. Applied Sciences. 2019; 9 (21):4630.

Chicago/Turabian Style

Sang-Hwa Jung; Sungwoo Oh; Sung-Wook Kim; Jae-Heum Moon. 2019. "Effects of CNT Dosages in Cement Composites on the Mechanical Properties and Hydration Reaction with Low Water-to-Binder Ratio." Applied Sciences 9, no. 21: 4630.