Cited by On the Properties of New Polyurethane Fast-Curing Polymer Materials

On the Properties of New Polyurethane Fast-Curing Polymer Materials DOI

et al.

Materials, Journal Year: 2024, Volume and Issue: 17(24), P. 6231 - 6231

Published: Dec. 20, 2024

A sequences of unconfined compressive strength tests and flexural were conducted in this study to evaluate the curing performance a new type polyurethane sand fast-curing polymer material. The mechanical properties material investigated under different temperatures (−10 °C 60 °C), particle sizes (10–15 mesh, 60–80 100–120 325 mesh), proportions (20% 60%). Additionally, SEM analysis was employed further reveal reinforcement mechanism. results demonstrated that developed exhibited superior applicability across wide temperature range −10 °C. Both solidified increased with increase solidification temperature, resulting improved effects. This best when using within mesh range. As size decreased remaining specifications, there reduction specimen strain an strength, while still maintaining favorable ductility. optimal proportion for 40%. Moreover, nonlinear mathematical relationships between multiple influencing factors established through multivariate regression analysis. consolidation specimens X-shaped conjugate shear failure, which tended occur at weak interface Lastly, Pearson’s correlation revealed strong positive content strength.

Language: Английский

Assessment of Diseases in Embankment–Bridge Transition Section With Methodological Detection Along the Qinghai‐Tibet Railway in Permafrost Regions DOI

Peifeng He, Fujun Niu,

Tianchun Dong

et al.

Permafrost and Periglacial Processes, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 11, 2025

ABSTRACT Embankment–bridge transition sections (EBTSs) suffer from diverse engineering diseases that have escalated into one of the most severe issues along Qinghai‐Tibet Railway (QTR). Nevertheless, causes and mechanisms in EBTSs remain limited. This study employed a methodological approach to conduct field surveys Tuotuo River Basin hinterland Plateau (QTP). Borehole investigations nuclear magnetic resonance (NMR) techniques accurately determined permafrost characteristics, enabling correction electromagnetic wave velocity acquisition resistivity threshold. Ground‐penetrating radar (GPR) quasi‐3D electrical tomography (ERT) were combined indicate above 200 Ω‐m. It reveals is relatively stable across large area on shaded side, whereas degradation more pronounced sunny where maximum active layer thickness (ALT) reaches 5.2 m. Notable substantial increases ALT observed near EBTS resulting heat absorption thermal erosion groundwater. Terrestrial laser scanning (TLS) captured time‐series deformation highlights specific displacements EBTS, demonstrating displacement rotational behavior wing walls. The groundwater around result expansion thawing bulbs increased structural even failure. was shown degradation, moisture influence, transfer characteristics are primary contributing factors disease's continued deterioration, thus reinforcement measures for existing structures need address these three issues. disease development revealed this paper provide new insights dynamics design maintenance regions.

Language: Английский

Citations

A review of technology, applications, and future perspectives of thermosyphons in permafrost regions DOI