Experimental Study on Deformation and Damage Evolution of Cracked Red Sandstone Under Freeze–Thaw Cycles DOI Creative Commons

Xiulan Han,

Guangchen Sun, Helin Fu

et al.

Applied Sciences, Journal Year: 2024, Volume and Issue: 14(23), P. 11174 - 11174

Published: Nov. 29, 2024

Cracked rock masses in cold regions are subjected to freeze–thaw cycles over extended periods, resulting deformation. The combined effects of cycling and the depth cracks significantly influence stability durability underground engineering these regions. In some with minimal annual rainfall, unable absorb external water during cycles. As deformation progresses, transitions naturally from a saturated state an unsaturated state. To investigate damage mechanisms evolution patterns red sandstone initial non-penetrating varying depths (20 mm, 30 40 mm) under conditions without replenishment saturation levels, relevant cycle experiments strain monitoring were conducted. results indicate that cracked experiences residual each cycle, which gradually accumulates, leading irreversible cumulative specimen after 45 was 40.69 times greater than first cycle. Additionally, characteristic values exhibited clear correlation crack depth. These findings provide experimental methods data references for analyzing failure induced by

Language: Английский

Fractal evolution of sandstone material under combined thermal and mechanical action: Microscopic pore structure and macroscopic fracture characteristics DOI

Mengchen Yun,

Jianxi Ren,

Meixian Tan

et al.

Materials Letters, Journal Year: 2025, Volume and Issue: unknown, P. 138388 - 138388

Published: March 1, 2025

Language: Английский

Citations

0
Ancient Egyptian Granite Graffiti of Bigeh Island, Philae Archaeological Site (Aswan, Egypt): An Archaeometric and Decay Assessment for Their Conservation DOI Creative Commons
Abdelrhman Fahmy, Salvador Domínguez Bella, Eduardo Molina

et al.

Heritage, Journal Year: 2025, Volume and Issue: 8(4), P. 137 - 137

Published: April 12, 2025

This study investigates the deterioration of granite graffiti at Philae Archaeological Site on Bigeh Island (Aswan, Egypt), attributed to Khaemwaset (1281–1225 BCE, 19th Dynasty). These graffiti, despite being carved into durable Aswan granite, are experiencing progressive degradation due environmental and hydrological factors. research aims analyze mineralogical chemical transformations affecting provide a comparative assessment submerged unsubmerged surfaces. A multi-analytical approach was employed, combining petrographical examination, X-ray diffraction (XRD), fluorescence (XRF), scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS) identify compositional changes patterns. The results indicate in periodically exposed primarily consists quartz, feldspar, biotite, notable alterations including kaolinization illitization dissolution feldspar minerals biotite oxidation. processes directly linked prolonged exposure fluctuating water levels recurrent wet–dry cycles, which accelerate granular disintegration, exfoliation, surface loss. Additionally, salt crystallization, particularly halite, contributes weathering, while sulfate interactions promote weathering. In addition, biofilm colonization, facilitated by high moisture retention, further exacerbates producing organic acids that weaken mineral matrix. Finally, confirm need for conservation interventions mitigate ongoing damage.

Language: Английский

Citations

0
Study on the mechanical properties, thermal properties, and microstructure of phase change concrete (PCC): The application of active frost resistance of concrete in frozen soil areas DOI
Zhe Lü,

Zhun Tian,

Honghao Ying

et al.

Construction and Building Materials, Journal Year: 2024, Volume and Issue: 449, P. 138491 - 138491

Published: Sept. 29, 2024

Language: Английский

Citations

0
Experimental Study on Deformation and Damage Evolution of Cracked Red Sandstone Under Freeze–Thaw Cycles DOI Creative Commons

Xiulan Han,

Guangchen Sun, Helin Fu

et al.

Applied Sciences, Journal Year: 2024, Volume and Issue: 14(23), P. 11174 - 11174

Published: Nov. 29, 2024

Cracked rock masses in cold regions are subjected to freeze–thaw cycles over extended periods, resulting deformation. The combined effects of cycling and the depth cracks significantly influence stability durability underground engineering these regions. In some with minimal annual rainfall, unable absorb external water during cycles. As deformation progresses, transitions naturally from a saturated state an unsaturated state. To investigate damage mechanisms evolution patterns red sandstone initial non-penetrating varying depths (20 mm, 30 40 mm) under conditions without replenishment saturation levels, relevant cycle experiments strain monitoring were conducted. results indicate that cracked experiences residual each cycle, which gradually accumulates, leading irreversible cumulative specimen after 45 was 40.69 times greater than first cycle. Additionally, characteristic values exhibited clear correlation crack depth. These findings provide experimental methods data references for analyzing failure induced by

Language: Английский

Citations

0