Article(id=1311351176130552304, tenantId=1146029695717560320, journalId=1205116964453384197, issueId=1311351152067830064, articleNumber=null, orderNo=null, doi=10.20040/j.cnki.1000-7709.2026.20251541, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1756828800000, receivedDateStr=2025-09-03, revisedDate=1758902400000, revisedDateStr=2025-09-27, acceptedDate=1760025600000, acceptedDateStr=2025-10-10, onlineDate=1790580084115, onlineDateStr=2026-09-28, pubDate=1769270400000, pubDateStr=2026-01-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1790580084115, onlineIssueDateStr=2026-09-28, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1790580084115, creator=13701087609, updateTime=1790580084115, updator=13701087609, issue=Issue{id=1311351152067830064, tenantId=1146029695717560320, journalId=1205116964453384197, year='2026', volume='44', issue='1', pageStart='1', pageEnd='246', issueExtLink='null', onlineDate='null', pubDate='1769270400000', pubDateStr='2026-01-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1790580078378, creator='13701087609', updateTime=1790588459421, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1311386304772927717, tenantId=1146029695717560320, journalId=1205116964453384197, issueId=1311351152067830064, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1311386304772927718, tenantId=1146029695717560320, journalId=1205116964453384197, issueId=1311351152067830064, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=104, endPage=107, ext={EN=ArticleExt(id=1311351176285741553, articleId=1311351176130552304, tenantId=1146029695717560320, journalId=1205116964453384197, language=EN, title=Study on Modification Effect and Mechanism of Polypropylene Fibers on Self-Compacting Hydraulic Concrete, columnId=null, journalTitle=Water Resources and Power, columnName=null, runingTitle=null, highlight=null, articleAbstract=

This study focuses on the modification effect of incorporating polypropylene fibers to enhance the mechanical properties of self-compacting hydraulic concrete. It systematically investigates the influence patterns of fiber parameters (length and dosage) and curing time on its compressive strength, failure strain, and microstructural evolution. Experimental programs with varying polypropylene fiber parameters (length and dosage) and curing durations were designed. Multi-scale analysis was carried out through macroscopic mechanical testing and microstructural characterization techniques. At the macro level, standard compressive strength tests and failure strain measurements were conducted to analyze the mechanical response to different parameters. At the micro level, scanning electron microscopy (SEM) and computed tomography (CT) scanning techniques were employed to investigate the synergistic mechanisms between fibers and hydration products. Polypropylene fibers significantly improved the mechanical performance of the concrete through “crack bridging” and “energy dissipation” mechanisms. When the fiber dosage reached 0.8%, the compressive strength increased by up to 80.3% compared to the control group. Both compressive strength and failure strain initially increased and then decreased with increasing fiber content. Short-cut fibers exhibited the best performance due to their superior dispersion uniformity. Microstructural analysis revealed that the fibers and hydration products formed a dense three-dimensional network, effectively delaying the failure process. However, fiber agglomeration occurred when the dosage exceeded the optimal level, which weakened the overall mechanical performance. A self-compacting hydraulic concrete mix design incorporating 0.8% fiber dosage and short-cut fibers can significantly enhance the mechanical performance. The synergistic effect between fibers and hydration products is central to performance improvement, while balancing fiber dosage and dispersion is essential to prevent agglomeration. This research provides a theoretical foundation and practical guidance for improving the mechanical performance of self-compacting hydraulic concrete in hydraulic engineering applications.

, authors=De-min ZHANG, authorsList=De-min ZHANG, authorCompany=null, 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, fund=null), CN=ArticleExt(id=1311351176650646002, articleId=1311351176130552304, tenantId=1146029695717560320, journalId=1205116964453384197, language=CN, title=自密实水工混凝土的聚丙烯纤维改性效果及机理研究, columnId=1207271182139736888, journalTitle=水电能源科学, columnName=水工结构、水工材料与水利工程施工, runingTitle=null, highlight=null, articleAbstract=

为提升自密实水工混凝土的力学性能，本研究聚焦聚丙烯纤维的掺入改性作用，系统探究纤维参数（长度、掺量）及养护时间对其抗压强度、破坏应变及微观结构演化的影响规律。通过设计不同聚丙烯纤维参数（纤维长度、掺量）及养护时间的试验方案，结合宏观力学测试与微观结构表征技术进行多尺度研究。宏观层面，采用标准抗压强度试验及破坏应变测定，分析不同参数下混凝土的力学响应；微观层面，依托SEM扫描电镜与CT扫描技术，揭示纤维与水化凝胶体系的协同作用机制。聚丙烯纤维通过“裂隙桥接”与“能量缓冲”机制显著提升了混凝土的力学性能。当纤维掺量为0.8%（体积掺量）时，抗压强度较基准组最高提升80.3%；抗压强度与破坏应变均随纤维掺量增加呈现先增后减趋势，短切纤维因更优的均匀分散性表现出最佳增益效果。微观分析显示，纤维与水化产物协同形成致密的三维网络结构，有效延缓了破坏进程；然而，当聚丙烯纤维的掺量超过临界值时，团聚效应会削弱自密实水工混凝土的整体力学性能。以0.8%掺量、短切纤维形态为关键参数的自密实水工混凝土设计方案，可显著提升力学性能。聚丙烯纤维与水化产物的协同效应是性能改善的核心，同时需平衡纤维掺量与分散性以避免团聚。本研究为水利工程中自密实混凝土的强度提升与耐久性优化提供了理论依据和实践指导。

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张德敏（1992-），男，硕士研究生，研究方向为建筑材料，E-mail: demzzz@126.com

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张德敏（1992-），男，硕士研究生，研究方向为建筑材料，E-mail: demzzz@126.com

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