Exploring the Mechanism of Microstructural Changes in Ultra-High-Performance Concrete Under Microwave Influence: Experiments and Molecular Dynamics Simulation DOI Open Access
Jingyuan Chen, Kunyang Yu, Shuangxin Li

et al.

Materials, Journal Year: 2025, Volume and Issue: 18(9), P. 1892 - 1892

Published: April 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.

Language: Английский

Exploring the Mechanism of Microstructural Changes in Ultra-High-Performance Concrete Under Microwave Influence: Experiments and Molecular Dynamics Simulation DOI Open Access
Jingyuan Chen, Kunyang Yu, Shuangxin Li

et al.

Materials, Journal Year: 2025, Volume and Issue: 18(9), P. 1892 - 1892

Published: April 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.

Language: Английский

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