Advanced Pore Structure Characterization of High-Volume Mineral Admixture Steam-Cured Mortar Using X-Ray Computed Tomography

Materials, Journal Year: 2025, Volume and Issue: 18(7), P. 1575 - 1575

Published: March 31, 2025

Steam curing is a widely used method in the production of industrial precast concrete but it often leads to thermal damage that negatively impacts material’s long-term durability and mechanical strength. The use supplementary cementitious materials (SCMs) has shown considerable promise improving pore structure alleviating these adverse effects. This study employs high-resolution X-ray computed tomography (X-CT) thoroughly assess how steam temperatures various subsequent regimes influence characteristics mortars containing high volumes mineral admixtures. results shows steam-cured specimens under water (ST8012-WA) achieved compressive strength 51.72 MPa flexural 5.85 MPa, representing improvements 9% 19.8%, respectively, compared natural (ST8012-NA: 47.32 4.88 MPa). standard-cured specimen (SD) exhibited highest 54.18 highlighting detrimental effects elevated temperatures. findings reveal higher result increased porosity decreased strength, challenges can be effectively mitigated through appropriate postcuring techniques. Notably, following proves especially effective reducing size variability durability. research offers new insights into intricate relationships among temperature, morphology, performance, providing practical recommendations optimize quality longevity components.

Language: Английский

Performance Degradation Law and Model Construction of Hydraulic Concrete Under Freeze-Thaw Cycles: A Comprehensive Review

Buildings, Journal Year: 2025, Volume and Issue: 15(10), P. 1596 - 1596

Published: May 9, 2025

Hydraulic concrete structures in cold regions often suffer from the combined action of freeze-thaw (FT) cycles and external loads, indicating that these depend on effects two or more factors. In recent years, researchers around world have made considerable efforts explorations to solve this challenge, achieving fruitful research results. This article provides a comprehensive literature review performance degradation law model construction hydraulic under FT cycles. Firstly, theory characterization method damage for are introduced. Given inherent deficiencies traditional detection methodologies constraints imposed by extant computed tomography (CT) technology, there is an urgent need develop high-precision segmentation technique concrete. By capitalizing resultant microstructure, accurate predictive can be established. Thereafter, in-depth discussion conducted mechanism when subjected conjunction with loading scenarios, namely fracture, direct tension, triaxial stress, wear. As different factors cause serious than single factor, evolution complex. Although attempted reveal deterioration multi-factor interaction means numerical methods, still many fundamental issues require further exploration due limitations constitutive models. Finally, existing results summarized, novel insights proposed future directions. study promptly identifies gaps urgently filled, especially insufficient understanding complex stress state inadequate action. investigation aims determine focus relation could advance revelation caused interaction. providing detailed overview current terms highlighting limitations, suggesting directions, seeks contribute safe operation regions.

Language: Английский

Research on improving the performance and mechanism of manufactured sand concrete based on vibration-coupled mixing

Journal of Building Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 112971 - 112971

Published: May 1, 2025

Language: Английский