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Dr. Byeong Hun Woo
Hanyang Univeristy, Republic of Korea

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0 Concrete
0 Corrosion
0 Corrosion Engineering
0 Mortar
0 Bayesian probability

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Concrete
Mortar
Corrosion
Gaussian process regression

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Journal article
Published: 16 August 2021 in Applied Thermal Engineering
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An enormous amount of energy is required to maintain a comfortable indoor temperature. This increases carbon dioxide emission, which is problematic. Phase-change materials have been widely used to resolve this problem and improve the energy efficiency of buildings. However, phase change materials have a fundamental drawback—leakage and low thermal conductivity. A novel thermal energy storage aggregate (TESA) was developed to solve the drawbacks of zeolites impregnated with paraffin wax and coated with epoxy resins, silicon carbide, and silica fume. A mortar which 100% replacement of TESA presented compressive strength that achieved the requirement for building material. To investigate the thermal properties, thermogravimetric analysis (thermally stable below 142 ℃), differential scanning calorimetry (melting point: 36.46 ℃, freezing point 46.39 ℃, latent heat storage capacity: 19.76 J/g), thermal conductivity and thermal behavior of mortar measurements were conducted. Thermal shock cycling was tested to evaluate the reliability of the TESA. Finally, the thermal energy storage performance was evaluated by laboratory-sized cell tests. A laboratory-sized cell test was conducted using a self-designed room model that resemble the actual construction. The indoor temperature of the cell specimen via 100% integration of TESA, reduced the maximum temperature during the heating period by approximately 22% compared with the control cell specimen. The experimental results indicate that TESA can be applied to wall-plastering cement mortar, reducing energy consumption by decreasing the indoor temperature and reducing the temperature fluctuation.

ACS Style

Dong Ho Yoo; In Kyu Jeon; Byeong Hun Woo; Hong Gi Kim. Performance of energy storage system containing cement mortar and PCM/epoxy/SiC composite fine aggregate. Applied Thermal Engineering 2021, 198, 117445 .

AMA Style

Dong Ho Yoo, In Kyu Jeon, Byeong Hun Woo, Hong Gi Kim. Performance of energy storage system containing cement mortar and PCM/epoxy/SiC composite fine aggregate. Applied Thermal Engineering. 2021; 198 ():117445.

Chicago/Turabian Style

Dong Ho Yoo; In Kyu Jeon; Byeong Hun Woo; Hong Gi Kim. 2021. "Performance of energy storage system containing cement mortar and PCM/epoxy/SiC composite fine aggregate." Applied Thermal Engineering 198, no. : 117445.

Journal article
Published: 06 August 2021 in Sustainability
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Incineration bottom ash is generated by the incineration of solid waste. Household solid waste is increasing every year and so is incineration bottom ash. This is a problem to treat the incineration bottom ash because the ash has many toxic components. Cement composites can solve this problem and there are many studies for using the bottom ash as fine aggregate. To evaluate the usage of incineration bottom ash, compressive strength, mercury intrusion porosimetry, scanning electron microscopy-backscatter electron, X-ray diffraction, and toxicity characteristic leaching processes were performed. When using incineration bottom ash up to 20% of substitution, the compressive strength in all cases was increased. This study showed how the filler effect appeared well in the cement composites through the scanning electron microscopy-backscatter electron, and mercury intrusion porosimetry. X-ray diffraction indicated the possibility of an alkali-silica reaction of the aggregate with the components of incineration bottom ash. This problem is an obstacle to applying the incineration bottom ash as a fine aggregate. In addition, the toxicity characteristic leaching process was shown to be under the threshold of the Korean standard, however, this should nuanced by the consideration of amorphity. Comprehensively, incineration bottom ash could be used as a fine aggregate of up to 20% of substitution. However, the pre-treatment would need to eliminate or reduce alkali reactive components and heavy metals.

ACS Style

Byeong-Hun Woo; In-Kyu Jeon; Dong-Ho Yoo; Seong-Soo Kim; Jeong-Bae Lee; Hong-Gi Kim. Utilization of Municipal Solid Waste Incineration Bottom Ash as Fine Aggregate of Cement Mortars. Sustainability 2021, 13, 8832 .

AMA Style

Byeong-Hun Woo, In-Kyu Jeon, Dong-Ho Yoo, Seong-Soo Kim, Jeong-Bae Lee, Hong-Gi Kim. Utilization of Municipal Solid Waste Incineration Bottom Ash as Fine Aggregate of Cement Mortars. Sustainability. 2021; 13 (16):8832.

Chicago/Turabian Style

Byeong-Hun Woo; In-Kyu Jeon; Dong-Ho Yoo; Seong-Soo Kim; Jeong-Bae Lee; Hong-Gi Kim. 2021. "Utilization of Municipal Solid Waste Incineration Bottom Ash as Fine Aggregate of Cement Mortars." Sustainability 13, no. 16: 8832.

Journal article
Published: 21 July 2021 in Materials
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To solve the problem of black ice, many studies are being carried out. The key in recent days is enhancing the thermal conductivity of concrete. In this study, to improve the thermal conductivity, silicon carbide was used to substitute 50% and 100% of the fine aggregate. In addition, steel fiber is not only for enhancing the mechanical properties but could enhance thermal conductive material. Hence, the arched-type steel fiber was used up to a 1% volume fraction in this study. Furthermore, graphite was used for 5% of the volume fraction for enhancing the thermal conductivity. However, thermal damage would occur due to the difference in thermal conductivity between materials. Therefore, the thermal durability must be verified first. The target application of the concrete in this study was its use as road paving material. To evaluate the thermal durability, freeze–thaw and rapid cyclic thermal attacks were performed. The thermal conductivity of the specimens was increased with the increase in thermal conductive materials. Graphite has already been reported to have a negative effect on mechanical properties, and the results showed that this was the case. However, the steel fiber compensated for the negative effect of graphite, and the silicon carbide provided a filler effect. Graphite also had a negative effect on the freeze–thaw and rapid cyclic thermal attack, but the steel fiber compensated for the reduction in thermal durability. The silicon carbide also helped to improve the thermal durability in the same way as steel fiber. Comprehensively, the steel fiber enhanced all of the properties of the tests. Using 100% silicon carbide was considered the acceptable range, but 50% of silicon carbide was the best. Graphite decreased all the properties except for the thermal conductivity. Therefore, the content of graphite or using other conductive materials used should be carefully considered in further studies.

ACS Style

Byeong-Hun Woo; Dong-Ho Yoo; Seong-Soo Kim; Jeong-Bae Lee; Jae-Suk Ryou; Hong-Gi Kim. Effects of Thermal Conductive Materials on the Freeze-Thaw Resistance of Concrete. Materials 2021, 14, 4063 .

AMA Style

Byeong-Hun Woo, Dong-Ho Yoo, Seong-Soo Kim, Jeong-Bae Lee, Jae-Suk Ryou, Hong-Gi Kim. Effects of Thermal Conductive Materials on the Freeze-Thaw Resistance of Concrete. Materials. 2021; 14 (15):4063.

Chicago/Turabian Style

Byeong-Hun Woo; Dong-Ho Yoo; Seong-Soo Kim; Jeong-Bae Lee; Jae-Suk Ryou; Hong-Gi Kim. 2021. "Effects of Thermal Conductive Materials on the Freeze-Thaw Resistance of Concrete." Materials 14, no. 15: 4063.

Journal article
Published: 01 June 2021 in Sustainability
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This study conducted fundamental tests on mortars using the boron compounds recycled industrial wastes to replace uneconomic boron products. The boron compounds were three types according to the pH and the physical and neutron shielding performance of mortar mixed with boron compounds was examined. The adopted boron compounds classified as acid, slightly alkaline, and strongly alkaline with respect to the pH are acidic boric acid, alkali borax, and high alkali borax, respectively. The physical properties were evaluated by measuring the compressive strength and setting time as well as the thermal neutron shielding performance. The measured compressive strength revealed that the strengths of the specimens mixed with boron compounds were generally lower than that of the basic specimen made of control specimen. In addition, the initial and final setting times were longer than those of the control specimen. The thermal neutron shielding performances of the specimens mixed with boron compounds were higher than that of the control specimen. Consequently, the differences of the type and chemical composition of boron compounds influenced the physical properties and thermal neutron shielding performance of mortar, including its compressive strength, setting time, and neutron shielding performance. Therefore, it is important to determine the optimal amount of boron compounds in the fabrication of mortar.

ACS Style

Binna Lee; Byeong-Hun Woo; Jae-Suk Ryou. Basic Mechanical and Neutron Shielding Performance of Mortar Mixed with Boron Compounds with Various Alkalinity. Sustainability 2021, 13, 6252 .

AMA Style

Binna Lee, Byeong-Hun Woo, Jae-Suk Ryou. Basic Mechanical and Neutron Shielding Performance of Mortar Mixed with Boron Compounds with Various Alkalinity. Sustainability. 2021; 13 (11):6252.

Chicago/Turabian Style

Binna Lee; Byeong-Hun Woo; Jae-Suk Ryou. 2021. "Basic Mechanical and Neutron Shielding Performance of Mortar Mixed with Boron Compounds with Various Alkalinity." Sustainability 13, no. 11: 6252.

Journal article
Published: 23 May 2021 in Applied Thermal Engineering
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This study focused on the assessment of the ice-melting performance of cement composites using silicon carbide as fine aggregate. To assess the ice-melting performance, two mechanical and three thermal properties were measured and the results were discussed. After measuring the mechanical and thermal properties, the ice-melting test was conducted to confirm the ice-melting performance and the mechanical variation was confirmed through a splitting tensile test. The specimen that used 30% of silicon carbide as fine aggregate showed the highest compressive strength of 68.24 MPa at the 28 days of curing age and the specimens that used 100% of silicon carbide as fine aggregate were the lowest compressive strength of 38.93 MPa at the 28 days of curing age. However, the compressive strength that the case of used 100% of silicon carbide was in the acceptable range. The flexural strength increased with silicon carbide contents of up to 70%. The thermal properties including the thermal conductivity, diffusivity, and specific heat capacity showed nearly the same behaviors. These properties increased with the increase of silicon carbide content. The reason for this phenomenon was related to the volumetric occupancy of silicon carbide in the cement composite. The ice-melting test showed the decreasing of melting time with the increase of the silicon carbide content. Comprehensively, it was demonstrated that the ice-melting performance enhanced for the same reason as the thermal properties and, silicon carbide could be used as fine aggregate for improving the thermal properties.

ACS Style

Byeong Hun Woo; In Kyu Jeon; Dong Ho Yoo; Hong Gi Kim; Jae-Suk Ryou. Ice-melting performance assessment of cement composites using silicon carbide as fine aggregate. Applied Thermal Engineering 2021, 194, 117113 .

AMA Style

Byeong Hun Woo, In Kyu Jeon, Dong Ho Yoo, Hong Gi Kim, Jae-Suk Ryou. Ice-melting performance assessment of cement composites using silicon carbide as fine aggregate. Applied Thermal Engineering. 2021; 194 ():117113.

Chicago/Turabian Style

Byeong Hun Woo; In Kyu Jeon; Dong Ho Yoo; Hong Gi Kim; Jae-Suk Ryou. 2021. "Ice-melting performance assessment of cement composites using silicon carbide as fine aggregate." Applied Thermal Engineering 194, no. : 117113.

Journal article
Published: 02 April 2021 in Materials
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Post-tensioned anchorage zones need enough strength to resist large forces from jacking forces from prestress and need spiral reinforcement to give confinement effect. High-strength concrete (HSC) has high-strength and brings the advantage of reducing material using and simplifying reinforcing. We tested strain stabilization, load–displacement, and strain of lateral reinforcements. Specimens that used one and two lateral reinforcements without spiral reinforcement did not satisfy the strain stabilization. Load capacity also did not satisfy the condition of 1.1 times the nominal tensile strength of PS strands presented in ETAG 013. On the other hand, specimens that used three and four lateral reinforcements without spiral reinforcement satisfied the strain stabilization but did not satisfy 1.1 times the nominal tensile strength of PS strands. However, the secondary confinement effect could be confirmed from strain stabilization. In addition, the affection of HSC characteristics could be confirmed from a reinforcing level comparing other studies. The main confinement effect could be confirmed from the reinforcement strain results; there was a considerable difference between with and without spiral reinforcement at least 393 MPa. Comprehensively, main and secondary confinement effects are essential in post-tensioned anchorage zones. In addition, the performance of the anchorage zone could be increased by using HSC that the combination of high-strength and confinement effect.

ACS Style

Jun Lee; Byeong Woo; Jae-Suk Ryou; Jee-Sang Kim. Performance Assessment of the Post-Tensioned Anchorage Zone Using High-Strength Concrete Considering Confinement Effect. Materials 2021, 14, 1748 .

AMA Style

Jun Lee, Byeong Woo, Jae-Suk Ryou, Jee-Sang Kim. Performance Assessment of the Post-Tensioned Anchorage Zone Using High-Strength Concrete Considering Confinement Effect. Materials. 2021; 14 (7):1748.

Chicago/Turabian Style

Jun Lee; Byeong Woo; Jae-Suk Ryou; Jee-Sang Kim. 2021. "Performance Assessment of the Post-Tensioned Anchorage Zone Using High-Strength Concrete Considering Confinement Effect." Materials 14, no. 7: 1748.

Journal article
Published: 10 March 2021 in Materials
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In this paper, the effect of nano-SiO2 (NS) and MgO on the hydration characteristics and anti-washout resistance of non-dispersible underwater concrete (UWC) was evaluated. A slump flow test, a viscosity test, and setting time measurement were conducted to identify the impacts of NS and MgO on the rheological properties of UWC. The pH and turbidity were measured to investigate the anti-washout performance of UWC mixes. To analyze the hydration characteristics and mechanical properties, hydration heat analysis, a compressive strength test, and thermogravimetric analyses were conducted. The experimental results showed that the fine particles of NS and MgO reduced slump flow, increased viscosity, and enhanced the anti-washout resistance of UWC. In addition, both NS and MgO shortened the initial and final setting times, and the replacement of MgO specimens slightly prolonged the setting time. NS accelerated the peak time and increased the peak temperature, and MgO delayed the hydration process and reduced the temperature due to the formation of brucite. The compressive results showed that NS improved the compressive strength of the UWC, and MgO slightly decreased the strength. The addition of NS also resulted in the formation of extra C–S–H, and the replacement of MgO caused the generation of a hydrotalcite phase.

ACS Style

In Jeon; Byeong Woo; Dong Yoo; Jae Ryou; Hong Kim. Evaluation of the Hydration Characteristics and Anti-Washout Resistance of Non-Dispersible Underwater Concrete with Nano-SiO2 and MgO. Materials 2021, 14, 1328 .

AMA Style

In Jeon, Byeong Woo, Dong Yoo, Jae Ryou, Hong Kim. Evaluation of the Hydration Characteristics and Anti-Washout Resistance of Non-Dispersible Underwater Concrete with Nano-SiO2 and MgO. Materials. 2021; 14 (6):1328.

Chicago/Turabian Style

In Jeon; Byeong Woo; Dong Yoo; Jae Ryou; Hong Kim. 2021. "Evaluation of the Hydration Characteristics and Anti-Washout Resistance of Non-Dispersible Underwater Concrete with Nano-SiO2 and MgO." Materials 14, no. 6: 1328.

Journal article
Published: 27 August 2020 in Applied Sciences
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Temperature is an important factor that affects corrosion potential in rebars. The temperature effect must be removed from the corrosion potential for precise measurement of corrosion rates. To separate the temperature effect from the corrosion potential, in this study rebar specimens were not embedded in concrete but, instead, were placed in an uncontrolled air environment. Gaussian process regression (GPR) was applied to the temperature and the non-corrosion potential data in order to remove the temperature effect from the corrosion potential. The results indicated that the corrosion potential was affected by the temperature. Furthermore, the GPR models of all the experimental cases showed high coefficients of determination (R2 > 0.90) and low root mean square errors (RMSE < 0.08), meaning that these models had high reliability. The fitted GPR models were used to successfully remove the temperature effect from the corrosion potential. This demonstrates that the GPR method can be appropriately used to assess the temperature effect on rebar corrosion.

ACS Style

Byeong Hun Woo; In Kyu Jeon; Seong Soo Kim; Jeong Bae Lee; Jae-Suk Ryou. An Experimental and Statistical Study on Rebar Corrosion Considering the Temperature Effect Using Gaussian Process Regression. Applied Sciences 2020, 10, 5937 .

AMA Style

Byeong Hun Woo, In Kyu Jeon, Seong Soo Kim, Jeong Bae Lee, Jae-Suk Ryou. An Experimental and Statistical Study on Rebar Corrosion Considering the Temperature Effect Using Gaussian Process Regression. Applied Sciences. 2020; 10 (17):5937.

Chicago/Turabian Style

Byeong Hun Woo; In Kyu Jeon; Seong Soo Kim; Jeong Bae Lee; Jae-Suk Ryou. 2020. "An Experimental and Statistical Study on Rebar Corrosion Considering the Temperature Effect Using Gaussian Process Regression." Applied Sciences 10, no. 17: 5937.

Journal article
Published: 29 May 2020 in Construction and Building Materials
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This work investigates the thermal energy storage performance of concrete using a phase change material (PCM)/SiC-based composite aggregate made with paraffin wax, silicon carbide, and slag aggregate. The thermal energy storage properties were evaluated using a differential scanning calorimetry (DSC) curve, thermal conductivity, hydration heat development, and internal temperature measurements. In addition, a mock-up concrete structure was constructed to evaluate thermal energy storage under natural conditions. The DSC curve showed that the PCM/SiC-based composite aggregate changed its phase and stored thermal energy at 33–34 °C. The internal temperature test indicated that the temperature of the sample with PCM/SiC-based composite aggregate was approximately 2–10 °C higher because of the thermal heat storage capacity of the PCM/SiC-based composite aggregate. A wall surface temperature of 42 °C and 45 °C, respectively at the internal and external side of the energy storage structure wall was measured. While an indoor temperature of 35 °C was observed for energy storage structure. However, the internal surface temperature of the plain structure wall and the indoor room temperature were 41 °C and 38 °C, respectively. The concrete structure with PCM/SiC-based composite aggregate decreased the room temperature and stored thermal energy of approximately 3 °C.

ACS Style

Hong Gi Kim; Abdul Qudoos; In Kyu Jeon; Byeong Hun Woo; Jae Suk Ryou. Assessment of PCM/SiC-based composite aggregate in concrete: Energy storage performance. Construction and Building Materials 2020, 258, 119637 .

AMA Style

Hong Gi Kim, Abdul Qudoos, In Kyu Jeon, Byeong Hun Woo, Jae Suk Ryou. Assessment of PCM/SiC-based composite aggregate in concrete: Energy storage performance. Construction and Building Materials. 2020; 258 ():119637.

Chicago/Turabian Style

Hong Gi Kim; Abdul Qudoos; In Kyu Jeon; Byeong Hun Woo; Jae Suk Ryou. 2020. "Assessment of PCM/SiC-based composite aggregate in concrete: Energy storage performance." Construction and Building Materials 258, no. : 119637.

Journal article
Published: 21 August 2019 in Materials
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The purpose of this study was to prevent early age autogenous shrinkage in high-strength mortars with saturated tea waste particles. In general, high strength and high performance concretes are made with low water/binder ratios; hence, they are susceptible to shrink at early ages. This shrinkage occurs due to self-desiccation that leads to autogenous shrinkage. To overcome self-desiccation problems in high-strength cement composites, it is necessary to keep the composites moist for a long time. Pre-saturated porous lightweight aggregates and super absorbent polymers are the most commonly used materials in high-strength cement composites to keep them moist for a long time; however, in this study, porous tea waste particles were used to keep the cement mortars moist. Pre-saturated tea waste particles were used in two different size proportions, making up as much as 3% of the volume of the binder. Moreover, commonly used lightweight aggregate (perlite) was also used to compare the outcomes of specimens made with tea waste particles. Different parameters were observed, such as, flow of fresh mortars, autogenous shrinkage, mechanical strengths and microstructure of specimens. The addition of tea waste and perlite particles in mortars made with Ordinary Portland cement (OPC) as the only binder, showed a reduction in flow, autogenous shrinkage and mechanical strengths, as compared to mixes made with partial addition of silica fume. Although, the use of silica fume improved the mechanical strength of specimens. Moreover, the use of saturated tea waste and perlite particles also improved the microstructure of specimens at an age of 28 days. The results revealed that the saturated tea waste particles have the ability to prevent autogenous shrinkage but they reduce strength of high-strength mortars at early ages.

ACS Style

Sadam Hussain Jakhrani; Jae Suk Ryou; Atta- Ur- Rehman; In Kyu Jeon; Byeong Hun Woo; Hong Gi Kim. Prevention of Autogenous Shrinkage in High-Strength Mortars with Saturated Tea Waste Particles. Materials 2019, 12, 2654 .

AMA Style

Sadam Hussain Jakhrani, Jae Suk Ryou, Atta- Ur- Rehman, In Kyu Jeon, Byeong Hun Woo, Hong Gi Kim. Prevention of Autogenous Shrinkage in High-Strength Mortars with Saturated Tea Waste Particles. Materials. 2019; 12 (17):2654.

Chicago/Turabian Style

Sadam Hussain Jakhrani; Jae Suk Ryou; Atta- Ur- Rehman; In Kyu Jeon; Byeong Hun Woo; Hong Gi Kim. 2019. "Prevention of Autogenous Shrinkage in High-Strength Mortars with Saturated Tea Waste Particles." Materials 12, no. 17: 2654.

Conference paper
Published: 15 May 2018
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DOI: 10.5176/2301-394X_ACE18.200 Authors: Kim, Jee-Sang Jo, Young Jae, Yoo, Kyung Suk and Woo, Byeong Hun In the anchorage zones of post-t

ACS Style

Byeong Hun Woo. An Experimental Evaluation of Post-Tensioned Anchorage Zones Using High Strength Concrete. 2018, 1 .

AMA Style

Byeong Hun Woo. An Experimental Evaluation of Post-Tensioned Anchorage Zones Using High Strength Concrete. . 2018; ():1.

Chicago/Turabian Style

Byeong Hun Woo. 2018. "An Experimental Evaluation of Post-Tensioned Anchorage Zones Using High Strength Concrete." , no. : 1.