Exploring the Mechanism of Microstructural Changes in Ultra-High-Performance Concrete Under Microwave Influence: Experiments and Molecular Dynamics Simulation

Materials, Год журнала: 2025, Номер 18(9), С. 1892 - 1892

Опубликована: Апрель 22, 2025

To elucidate the mechanisms of microstructural changes in ultra-high-performance concrete (UHPC) under microwave exposure, this study characterizes microstructure at multiple scales using a combination microscopic experiments and molecular dynamics simulations. The hydration products, pore structure, morphology, interface transition zone (ITZ) UHPC specimens were analyzed mercury intrusion porosimetry (MIP), X-ray diffraction (XRD), scanning electron microscopy (SEM). Molecular simulations employed to investigate uniaxial tensile behavior, free volume, radial distribution calcium silicate hydrate (C-S-H) gel, primary product. results indicate that curing significantly reduces volume specimens, with daily average reduction 0.15% early stages. This accelerated porosity effectively diminishes number high-risk pores. products formed exhibit higher density enhanced internal optimization. Simulation findings suggest non-thermal effects microwaves play more significant role structural evolution. orientation C-S-H after oscillation, leading ordered arrangements. Mechanical oscillation also expels from crystal cells, promoting compact overall structure increasing strength by up 1 GPa.

Язык: Английский

Quasi-static and dynamic mechanical properties of concrete containing cellulose fiber: Mechanism and effects

Construction and Building Materials, Год журнала: 2025, Номер 483, С. 141701 - 141701

Опубликована: Май 13, 2025

Язык: Английский

Experimental investigation of static and dynamic compressive behavior of carbon fiber reinforced concrete at elevated temperatures

Engineering Fracture Mechanics, Год журнала: 2025, Номер unknown, С. 111275 - 111275

Опубликована: Май 1, 2025

Язык: Английский