Hanyang University · Engineering
Professor Ki Yong Ann's research lab specializes in advanced construction materials, with a primary focus on enhancing the durability and performance of concrete through innovative cementitious systems and surface treatments. Key research directions include the development and characterization of magnesium phosphate cement (MPC) for rapid-hardening applications, the influence of cement composition—particularly C3A content—on chloride transport and corrosion resistance, and the application of hydrophobic silane-based coatings to mitigate ionic penetration in concrete pavements. The lab employs advanced testing methods such as electrochemical impedance spectroscopy, X-ray diffraction, and mercury intrusion porosimetry to understand microstructural and transport properties at the pore level.
Figures are computed from collected data and may differ slightly.
Fundamental properties of magnesium phosphate cement (MPC) were investigated in this paper. The setting time and compressive and bond (i.e., flexural and tensile bond) strengths were measured to assess the applicability, and hydration product was detected by the X-ray diffraction. The specimens were manufactured with magnesia and potassium dihydrogen phosphate (K 2 HPO 4 ) was added to activate hydration process. The Borax (Na 2 B 4 O 7 ·10H 2 O) was used as a retarder to mitigate overwhelming r
The present study concerns a development of calcium aluminate cement (CAC) concrete to enhance the durability against an externally chemically aggressive environment, in particular, chloride-induced corrosion. To evaluate the inhibition effect and concrete properties, CAC was partially mixed with ordinary Portland cement (OPC), ranging from 5% to 15%, as a binder. As a result, it was found that an increase in the CAC in binder resulted in a dramatic decrease in the setting time of fresh concrete
Laboratory tests were undertaken to assess the effect of calcium nitrite-based corrosion inhibitors in raising the chloride threshold level (CTL) for the corrosion of steel embedded in concrete and hence the time to corrosion initiation. Specimens with a centrally located steel rebar were cast with 0, 1·23, 2·5 and 5·0% nitrite by weight of cement and were cured for 4 weeks. Then they were immersed in 4M sodium chloride solution and the galvanic current between the embedded steel and an external
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