Search Results - "YOUNG CHEOL CHOI"

Effects of chemical composition of fly ash on compressive strength of fly ash cement mortar by Cho, Young Keun, Jung, Sang Hwa, Choi, Young Cheol

“…•Fly ash cement mortar was made by replacing 25 wt% of cement with 16 fly ash types.•The compressive strengths of these specimens were evaluated.•The…”
Get full text

Nonlinear Control of Quadrotor for Point Tracking: Actual Implementation and Experimental Tests by Choi, Young-Cheol, Ahn, Hyo-Sung

“…In this paper, a nonlinear control scheme along with its simulation and experimental results for a quadrotor are presented. It is not easy to control the…”
Get full text

Hydration and Mechanical Properties of High-Volume Fly Ash Cement under Different Curing Temperatures by Choi, Young-Cheol

“…This study aimed to investigate the effects of different curing temperatures on the hydration and mechanical properties of high-volume fly ash (HVFA) concrete…”
Get full text

Degree of Hydration, Microstructure, and Mechanical Properties of Cement-Modified TiO2 Nanoparticles by Choi, Young-Cheol

“…This study investigated the effects of TiO2 nanoparticles (TNPs) on the hydration and microstructure of cement. The primary experimental variable was the TNP…”
Get full text

Self-Healing Products of Cement Pastes with Supplementary Cementitious Materials, Calcium Sulfoaluminate and Crystalline Admixtures by Park, Byoungsun, Choi, Young-Cheol

“…The phase composition of self-healing products generated in cracks affects self-healing performance. This study investigated the self-healing products of…”
Get full text

Mercury intrusion porosimetry characterization of micropore structures of high-strength cement pastes incorporating high volume ground granulated blast-furnace slag by Choi, Young Cheol, Kim, Jiyoung, Choi, Seongcheol

“…•We experimentally characterized the microstructures of high volume GGBFS-blended high-strength cement pastes.•The total porosity increased over the GGBFS…”
Get full text

Hydration and Mechanical Properties of Cement Kiln Dust-Blended Cement Composite by Lee, Woo-Seok, Choi, Young-Cheol

“…This study aims to investigate the effects of cement kiln dust (CKD) on the hydration reactions and mechanical properties of cement, and to evaluate its…”
Get full text

Hydration and Mechanical Properties of High-Volume Fly Ash Concrete with Nano-Silica and Silica Fume by Kim, Byung-Jun, Lee, Geon-Wook, Choi, Young-Cheol

“…This study investigated the effects of nano-silica (NS) and silica fume (SF) on the hydration reaction of high-volume fly ash cement (HVFC) composites. In…”
Get full text

Investigating a new method to assess the self-healing performance of hardened cement pastes containing supplementary cementitious materials and crystalline admixtures by Byoungsun, Park, Young, Cheol Choi

“…The autogenous healing of cementitious materials allows for the self-healing of cracks in concrete structures. It is known to be caused by (a) further…”
Get full text

Prediction of Self-Healing Potential of Cementitious Materials Incorporating Crystalline Admixture by Isothermal Calorimetry by Park, Byoungsun, Choi, Young Cheol

“…Crack formation is an inherent property of concrete structures; however, these materials also have the ability to heal cracks autogenously. External water…”
Get full text

Effects of aluminate rich slag on compressive strength, drying shrinkage and microstructure of blast furnace slag cement by Cho, Bong Suk, Lee, Hoon Ha, Choi, Young Cheol

“…•Aluminate rich steel slag (ARS) is a byproduct generated form steelmaking process.•ARS with high Al2O3 and CaO contents is mainly composed of C12A7 and…”
Get full text

Effects of salinity changes on the osmoregulatory and stress responses in the bay scallop Argopecten irradians by Song, Jin Ah, Choi, Young Jae, Choi, Cheol Young

“…Most marine mollusks exhibit osmoregulatory mechanisms to cope with hypo- or hyperosmotic stress. In the present study, we elucidated the effects of exposure…”
Get full text

Effect of Clinker Binder and Aggregates on Autogenous Healing in Post-Crack Flexural Behavior of Concrete Members by Lee, Kwang-Myong, Choi, Young-Cheol, Park, Byoungsun, Choo, Jinkyo, Yoo, Sung-Won

“…Crack healing has been studied extensively to protect reinforced concrete structures from the ingress of harmful ions. Research examining the regain in the…”
Get full text

Fractal Characteristics of Pore Structures in GGBFS-based Cement Pastes by Kim, Jiyoung, Choi, Young Cheol, Choi, Seongcheol

“…•Pore surface fractal characteristics of GGBFS-based cement pastes were evaluated.•Three pore-size ranges exhibited fractal characteristics.•Pore volume and…”
Get full text

Alkali–silica reactivity of cementitious materials using ferro-nickel slag fine aggregates produced in different cooling conditions by Choi, Young Cheol, Choi, Seongcheol

“…•The ASR of cementitious materials using FNS fine aggregates was experimentally evaluated.•The ASR of FNS fine aggregated is strongly affected by the cooling…”
Get full text

Hydration Properties of STS-Refining Slag-Blended Blast Furnace Slag Cement by Cho, Bongsuk, Choi, Youngcheol

“…The refining process using an aluminum deoxidizer for fabricating stainless steel generated steel slag (STS-refining slag (SRS)) that contains a large amount…”
Get full text

Hydration and internal curing properties of plant-based natural fiber-reinforced cement composites by Choi, Young Cheol

“…This study investigated the effect of natural fibers on the hydration reaction of cement, in addition to the applicability of such fibers as internal curing…”
Get full text

Flexural Behavior of HPFRCC Members with Inhomogeneous Material Properties by Shin, Kyung-Joon, Jang, Kyu-Hyeon, Choi, Young-Cheol, Lee, Seong-Cheol

“…In this paper, the flexural behavior of High-performance Fiber-Reinforced Cementitious Composite (HPFRCC) has been investigated, especially focusing on the…”
Get full text

Effect of internal curing by superabsorbent polymers – Internal relative humidity and autogenous shrinkage of alkali-activated slag mortars by Song, Chiwon, Choi, Young Cheol, Choi, Seongcheol

“…•The internal curing effect by SAPs was experimentally evaluated.•The IRH and autogenous shrinkage were measured.•The IRH and shrinkage decreased with…”
Get full text

Quantitative evaluation of crack self-healing in cement-based materials by absorption test by Park, Byoungsun, Choi, Young Cheol

“…•Water absorption test was used to evaluate the self-healing performance of cement-based materials.•Various types of cement based materials…”
Get full text