{"title":"Effect of cyclic freeze-thaw treatment on mode I and mode II fracture characteristics of sandstone","authors":"","doi":"10.1016/j.conbuildmat.2024.138747","DOIUrl":null,"url":null,"abstract":"<div><div>As more and more cold region engineering projects like roadside slopes, mining slopes, and dams are at risk of fracture failure, the fracture characteristics and mechanisms of rocks under freeze-thaw cycles need to be further clarified. This paper aims to reveal the evolution of pore structure, fracture characteristics, and their correlation in freeze-thaw treated sandstone through freeze-thaw cycle tests, nuclear magnetic resonance tests, and static splitting tests of samples under different fracture modes. The effects of freeze-thaw cycles on sample porosity, peak stress, fracture toughness, fracture energy, and failure modes were analyzed. Results show that spectrum areas of meso pores, macro pores and all pores show growth trend with F-T cycles, their growth rate reach 47.74 %, 338.51 % and 63.25 % at 100F-T cycles. Both of peak stress, fracture toughness and fracture energy for two fracture modes have similar variation trend, they exhibit a logarithmic decline with the increase of F-T cycles as accelerated pore structure development and damage accumulation induced by freeze-thaw weathering, their decline rate ranges from 68.95 % to 84.32 % at 100 F-T cycles. The mechanical parameters of specimens failure with mode I fracture are smaller than that failure with mode II fracture due to the development of the pore structure. In addition, fracture toughness, peak stress show strong linear correlation with the spectral area of large pores, and fracture toughness and fracture energy shows a strong quadratic relationship. The failure forms of two fractures mode changed with F-T weathering.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":null,"pages":null},"PeriodicalIF":7.4000,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Construction and Building Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0950061824038893","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
As more and more cold region engineering projects like roadside slopes, mining slopes, and dams are at risk of fracture failure, the fracture characteristics and mechanisms of rocks under freeze-thaw cycles need to be further clarified. This paper aims to reveal the evolution of pore structure, fracture characteristics, and their correlation in freeze-thaw treated sandstone through freeze-thaw cycle tests, nuclear magnetic resonance tests, and static splitting tests of samples under different fracture modes. The effects of freeze-thaw cycles on sample porosity, peak stress, fracture toughness, fracture energy, and failure modes were analyzed. Results show that spectrum areas of meso pores, macro pores and all pores show growth trend with F-T cycles, their growth rate reach 47.74 %, 338.51 % and 63.25 % at 100F-T cycles. Both of peak stress, fracture toughness and fracture energy for two fracture modes have similar variation trend, they exhibit a logarithmic decline with the increase of F-T cycles as accelerated pore structure development and damage accumulation induced by freeze-thaw weathering, their decline rate ranges from 68.95 % to 84.32 % at 100 F-T cycles. The mechanical parameters of specimens failure with mode I fracture are smaller than that failure with mode II fracture due to the development of the pore structure. In addition, fracture toughness, peak stress show strong linear correlation with the spectral area of large pores, and fracture toughness and fracture energy shows a strong quadratic relationship. The failure forms of two fractures mode changed with F-T weathering.
期刊介绍：
Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged.
Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.
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