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Using both ultrasonic plane testing and opposite-side measurement methods, the thickness of the damaged layer and the development of internal defects in PANFRC were evaluated. Furthermore, the evolution of the pore structure was analyzed using NMR technology and pore fractal theory. Results indicate that under the combined action of salt-freezing cycles, the thickness of the damaged layer increases progressively, and its compressive strength decreases, leading to a corresponding reduction in the overall compressive strength of the concrete. A linear relationship was observed between these two parameters. The ultrasonic velocity in the central region of the PANFRC specimens decreased sharply, and the area of the defect zone expanded significantly, making this region the most vulnerable part under load and prone to fracture. When the PANF content exceeds 1.5 kg/m³, the loss in ultrasonic velocity is minimized, and the fibers effectively inhibit the growth of internal defects, thereby enhancing the toughness of the concrete, particularly during the middle to late stages of salt-freezing cycles. As the number of salt-freezing cycles increases, the proportion of micropores in PANFRC decreases, while the number of macropores and microcracks increases. The total proportion of small and medium-sized pores also rises. Overall, the development of the pore structure follows a trend of increasing complexity, with small pore throats interconnecting and transforming into super-large and fissure-type pore throats., correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=null), CN=ArticleExt(id=1259474420129776257, articleId=1259474418934399610, tenantId=1146029695717560320, journalId=1259198796492718097, language=CN, title=盐冻耦合作用下纤维混凝土内部缺陷及孔隙结构, columnId=1259474419869729406, journalTitle=土木工程学报, columnName=岩土力学与 地基基础, runingTitle=null, highlight=null, articleAbstract=为研究高寒冻融气候及盐渍土环境对纤维混凝土的细观结构影响，以聚丙烯腈纤维混凝土（PANFRC）为例，开展复合盐腐蚀冻融耦合（盐冻）耐久性试验。采用超声平测法和对测法研究 PANFRC 的损伤层厚度和内部缺陷发展规律，并进一步基于 NMR 技术和孔隙分形理论详细分析孔隙结构的演变过程。结果表明：盐冻耦合作用下损伤层厚度逐渐增大、损伤层抗压强度减小，导致整体抗压强度降低且二者呈线性关系；试件中部声速下降快、缺陷区域扩大明显，为最不利区域；当纤维掺量大于 1.5 kg/m³ 时声速损失较少、限制缺陷发展明显且改善韧性效果更强；随着盐冻次数增加微孔比例降低，大孔与微裂隙比例增加，小中孔合计比例增大，孔隙结构发育呈增维过程，小孔喉联通转化为超大孔喉及裂隙孔喉是细观劣化的重要原因。, correspAuthors=覃源, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=Z/NebC7EtQob5l/AK+Igpw==, pdfFileSize=4164661, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=西安理工大学旱区水工程生态环境全国重点实验室, 陕西西安 710048, fund=1000-131X-2026-59-1-100.pdf, authors=段明翰¹, 覃源¹, 李阳¹, 袁旭东¹, authorsList=段明翰, 覃源, 李阳, 袁旭东)}, authors=null, 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