A5061806462- Concrete and Cement Materials Research
- Magnesium Oxide Properties and Applications
- Innovative concrete reinforcement materials
- Recycling and utilization of industrial and municipal waste in materials production
- Concrete Properties and Behavior
- Electrical and Bioimpedance Tomography
- Smart Materials for Construction
- Non-Destructive Testing Techniques
- Innovations in Concrete and Construction Materials
- Geophysical and Geoelectrical Methods
- Advanced ceramic materials synthesis
- Concrete Corrosion and Durability
- Rock Mechanics and Modeling
- Nuclear materials and radiation effects
- Clay minerals and soil interactions
- Adsorption and Cooling Systems
- Phase Change Materials Research
- High-pressure geophysics and materials
- Drilling and Well Engineering
- Building materials and conservation
- X-ray Diffraction in Crystallography
- Infrastructure Maintenance and Monitoring
- Geophysical Methods and Applications
- Layered Double Hydroxides Synthesis and Applications
- Geothermal Energy Systems and Applications
Kyonggi University
2016-2024
Ulsan National Institute of Science and Technology
2016-2022
University of Aberdeen
2013-2015
University of California, Berkeley
2012-2014
King's College Hospital
2013
Ancient Roman syntheses of Al-tobermorite in a 2000-year-old concrete block submerged the Bay Pozzuoli (Baianus Sinus), near Naples, have unique aluminum-rich and silica-poor compositions relative to hydrothermal geological occurrences. In relict lime clasts, crystals calcium contents that are similar ideal tobermorite, 33 35 wt%, but low-silica contents, 39 40 reflect Al 3+ substitution for Si 4+ Q 2 (1Al), 3 (2 Al) tetrahedral chain branching sites. The has double silicate structure with...
This study aimed to investigate the chloride-binding capacity of alkali-activated fly ash (denoted as FSW) and slag SSW) samples their synthesized Cl-bearing phases, which are capable binding immobilizing chloride when seawater is used mixing water. also examined progressive changes in pore structures FSW SSW over time. The results show that sample significantly more effective uptake ions compared at 28 days curing. While forms zeolites (Cl-chabazite Cl-sodalite) (possibly with similar types...
A comprehensive study was conducted to predict the elastic modulus and Poisson ratio of hardened cement pastes (HCPs), including numerical work, comparison two modelling approaches, experimental validation. Modelling approach 1 (M1) applied a continuum micromechanics model (CMM) whereas 2 (M2) used finite element analysis (FEA). This presents reliable method for predicting mechanical properties HCPs by firstly employing microstructures HCPs, obtained CEMHYD3D with random distribution...
Monosulfoaluminate (Ca₄Al₂(SO₄)(OH)12∙6H₂O) plays an important role in anion binding Portland cement by exchanging its original interlayer ions (SO₄2- and OH-) with chloride ions. In this study, scanning transmission X-ray microscope (STXM), absorption near edge structure (XANES) spectroscopy, diffraction (XRD) were used to investigate the phase change of monosulfoaluminate due interaction Pure was synthesized powder samples suspended 0, 0.1, 1, 3, 5 M NaCl solutions for seven days. At low...
The structure and elasticity of tricalcium aluminate ( C 3 A ) have been experimentally theoretically studied. From high‐pressure X ‐ray diffraction experiments, the bulk modulus 102(6) 110(3) GPa were obtained by fitting second‐ third‐order finite strain equation state, respectively. First‐principles calculations with a generalized gradient approximation gave an isotropic 102.1 isothermal 106.0 GPa. static using exchange‐correlation functional show excellent agreement experimental...
X-ray diffraction (XRD), scanning transmission microscopy (STXM) and absorption near edge structure (XANES) spectra were used to investigate the interactions between sodium chloride (NaCl) calcium silicate hydrate (C-S-H), primary binding phase of hydrated Portland cement. XRD analysis indicates interlayer expansion C-S-H with a high Ca/Si ratio. Contrast maps STXM images collected from C-S-Hs different ratios reacted NaCl solution reveal that interacts low ratio, while is intercalated into...
The elasticity of monocarboaluminate hydrates, 3CaO·Al2O3·CaCO3·xH2O (x = 11 or 8), has been investigated by first-principles calculations. Previous experimental study revealed that the fully hydrated 11) exhibits exceptionally low compressibility compared to other reported calcium aluminate hydrates. This stiff hydration product can contribute strength concrete made with Portland cements containing carbonates. In this study, full elastic tensors and mechanical properties crystal structures...