강성훈 교수

For optimum production of ultra-high performance concrete (UHPC), the material and microstructural properties of UHPC cured under various heat treatment (HT) conditions are studied. The effects of HT temperature and duration on the hydration reaction, microstructure, and mechanical properties of UHPC are investigated. Increasing HT temperature accelerates both cement hydration and pozzolanic reaction, but the latter is more significantly affected. This accelerated pozzolanic reaction in UHPC cle

This article presents a novel six degrees-of-freedom nanopositioning stage having a low-profile shape. The six degrees-of-freedom motion is achieved in a parallel configuration comprising four crab-leg flexure guide mechanisms and eight electromagnetic actuators. The crab-leg flexure can be engineered to exhibit similar stiffness levels in all the directions. The noncontact direct-drive nature of the electromagnetic actuators and the symmetric layout simplify the kinematics and result in conside

Without using strong alkaline solution or ordinary Portland cement, a new structural binder consisting of fly ash and hydrated lime was hardened through an intensified pozzolanic reaction. The main experimental variables are the addition of silica fume and initial thermal treatment (60 °C for 3 days). A series of experiments consisting of mechanical testing (compressive and flexural strength, modulus of elasticity), X-ray diffraction, and measurements of the heat of hydration, pore structure, an