Article(id=1240702072383918566, tenantId=1146029695717560320, journalId=1240670690148397066, issueId=1240702069502440044, articleNumber=null, orderNo=null, doi=10.3963/j.issn.1001-487X.2025.03.003, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1744041600000, receivedDateStr=2025-04-08, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1773736025186, onlineDateStr=2026-03-17, pubDate=1747238400000, pubDateStr=2025-05-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773736025186, onlineIssueDateStr=2026-03-17, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773736025186, creator=13701087609, updateTime=1773736025186, updator=13701087609, issue=Issue{id=1240702069502440044, tenantId=1146029695717560320, journalId=1240670690148397066, year='2025', volume='42', issue='3', pageStart='1', pageEnd='202', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1773736024499, creator=13701087609, updateTime=1773736381642, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1240703567544250807, tenantId=1146029695717560320, journalId=1240670690148397066, issueId=1240702069502440044, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1240703567544250808, tenantId=1146029695717560320, journalId=1240670690148397066, issueId=1240702069502440044, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=18, endPage=25, ext={EN=ArticleExt(id=1240702072568467944, articleId=1240702072383918566, tenantId=1146029695717560320, journalId=1240670690148397066, language=EN, title=Experimental Investigation on Dynamic Compressive Mechanical Properties of PVA Fiber-reinforced Recycled Aggregate Concrete, columnId=1240702071733801442, journalTitle=Blasting, columnName=THEORETICAL AND TECHNOLOGICAL EXPLORATION, runingTitle=null, highlight=null, articleAbstract=

To enhance the mechanical performance of recycled aggregate concrete (RAC) under dynamic loading, this study systematically investigates the synergistic effects of polyvinyl alcohol (PVA) fiber reinforcement and recycled coarse aggregate (RCA) replacement on the dynamic mechanical performance of RAC through split Hopkinson pressure bar (SHPB) impact compression tests. Thirty-six specimen groups with varying PVA fiber dosages (0%, 0.1%, 0.3%) and RCA replacement ratios (30%, 40%, 50%) were designed to elucidate the damage mechanisms and enhancement mechanisms of PVA fiber-reinforced recycled aggregate concrete (PVA-RAC) under impact loading, utilizing comprehensive analyses of dynamic stress-strain curves, failure patterns, and dynamic increase factors (DIF). The results demonstrate that PVA fibers significantly suppress crack propagation via bridging effects, thereby altering the material's failure mode from brittle fragmentation to ductile cracking. Both dynamic peak stress and DIF exhibit substantial improvements with increasing fiber content and strain rate. While higher RCA replacement ratios (40%~50%) diminish compressive strength due to the inherent porosity of RCA, their heterogeneous interfacial properties promote energy dissipation through complex crack propagation paths, thereby partially mitigating strength losses. This study establishes a theoretical framework for the dynamic design and application of PVA-RAC in seismic-resistant protective structures. Furthermore, it pioneers a synergistic approach to integrating construction waste recycling with the development of high-performance recycled building materials. The findings have both theoretical innovation and practical engineering significance.

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HE Li (1986-), male, Ph.D, professor, mainly engaged in research on intelligent blasting theory and technology, (E-mail) .
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为提升再生混凝土(RAC)在动态荷载下的力学性能,研究通过分离式霍普金森压杆(SHPB)动态压缩试验,系统探究了聚乙烯醇(PVA)纤维增强和再生粗骨料(RCA)替代对RAC动态力学性能的协同影响规律。设计36组不同PVA纤维体积掺量(0%、0.1%、0.3%)与RCA取代率(30%、40%、50%)的试样,结合动态应力-应变曲线、破坏形态及动态增长因子(DIF)等指标,揭示了聚乙烯醇纤维再生混凝土(PVA-RAC)在冲击荷载下的损伤机理与增强机制。结果表明:PVA纤维通过桥连作用显著抑制了裂缝扩展,使试样破坏模式由脆性粉碎转为延性龟裂,动态峰值应力与DIF均随纤维掺量和应变率增加显著提升;高RCA取代率(40%~50%)虽因骨料孔隙削弱了强度,但其内部多相界面特征通过复杂裂纹路径增强了能量耗散,部分抵消了强度损失。该成果为PVA-RAC在抗震防护工程中的动态设计与应用提供了理论依据,同时为建筑固废资源化与高性能再生建材的协同发展开辟了新路径,具有理论创新性与工程实践价值。

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何理(1986-),男,博士、教授,主要从事智能爆破理论及技术的研究,(E-mail)
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彭胜(1989-),男,博士、副教授,主要从事工程爆破理论及技术的研究,(E-mail)

PENG Sheng (1989-), male, Ph.D, associate professor, mainly engaged in research on engineering blasting theory and technology, (E-mail) .

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彭胜(1989-),男,博士、副教授,主要从事工程爆破理论及技术的研究,(E-mail)

PENG Sheng (1989-), male, Ph.D, associate professor, mainly engaged in research on engineering blasting theory and technology, (E-mail) .

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彭胜(1989-),男,博士、副教授,主要从事工程爆破理论及技术的研究,(E-mail)

PENG Sheng (1989-), male, Ph.D, associate professor, mainly engaged in research on engineering blasting theory and technology, (E-mail) .

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International Journal of Impact Engineering, 2017, 103(3): 107-123., articleTitle=Analysis on the waveform features of the split Hopkinson pressure bar tests of plain concrete specimen, refAbstract=null), Reference(id=1240702086602608776, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, doi=null, pmid=null, pmcid=null, year=2021, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[21], rfOrder=32, authorNames=陈鹏飞, journalName=null, refType=null, unstructuredReference=陈鹏飞. 玄武岩纤维和聚丙烯纤维混凝土抗冲击性能研究与数值分析[D]. 青岛: 青岛理工大学, 2021., articleTitle=玄武岩纤维和聚丙烯纤维混凝土抗冲击性能研究与数值分析, refAbstract=null), Reference(id=1240702086732632206, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, doi=null, pmid=null, pmcid=null, year=2021, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[21], rfOrder=33, authorNames=CHEN Peng-fei, journalName=null, refType=null, unstructuredReference=CHEN Peng-fei. Research and numerical analysis on impact resistance of basalt fiber and polypropylene fiber reinforced concrete[D]. Qingdao: Qingdao University of Technology, 2021. 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tableContent=null), ArticleFig(id=1240702080885773099, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=EN, label=Table 1, caption=

Characteristic of polyvinyl alcohol fiber material

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长度/mm Length/mm当量直径/μm Diameter/μm密度/(g·cm-3) Density/(g·cm-3)断裂伸长率/% Elongation at break/%抗拉强度/MPa Fracture strength/MPa
1215.31.2971830
), ArticleFig(id=1240702080986436405, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=CN, label=表1, caption=

聚乙烯醇纤维材料性能

, figureFileSmall=null, figureFileBig=null, tableContent=
长度/mm Length/mm当量直径/μm Diameter/μm密度/(g·cm-3) Density/(g·cm-3)断裂伸长率/% Elongation at break/%抗拉强度/MPa Fracture strength/MPa
1215.31.2971830
), ArticleFig(id=1240702081074516793, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=EN, label=Table 2, caption=

Design of mixing proportions and groups

, figureFileSmall=null, figureFileBig=null, tableContent=
试样编号Specimen按质量计的配合比/(kg·m-3) Mix proportions by weight/(kg·m-3)比例/% Ratio/%
PVA
水Water水泥Cement砂Sand天然粗骨料Natural coarse aggregate再生粗骨料Recycled coarse aggregate减水剂Water reducer
R30173411702768.6329.44.11
R40173411702658.8439.24.11
R50173411702549.0549.04.11
R30-P0.1173411702768.6329.44.110.1
R30-P0.3173411702658.8439.24.110.3
R40-P0.1173411702549.0549.04.110.1
R40-P0.3173411702768.6329.44.110.3
R50-P0.1173411702658.8439.24.110.1
R50-P0.3173411702549.0549.04.110.3
), ArticleFig(id=1240702081204540228, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=CN, label=表2, caption=

配合比和试验组设置

, figureFileSmall=null, figureFileBig=null, tableContent=
试样编号Specimen按质量计的配合比/(kg·m-3) Mix proportions by weight/(kg·m-3)比例/% Ratio/%
PVA
水Water水泥Cement砂Sand天然粗骨料Natural coarse aggregate再生粗骨料Recycled coarse aggregate减水剂Water reducer
R30173411702768.6329.44.11
R40173411702658.8439.24.11
R50173411702549.0549.04.11
R30-P0.1173411702768.6329.44.110.1
R30-P0.3173411702658.8439.24.110.3
R40-P0.1173411702549.0549.04.110.1
R40-P0.3173411702768.6329.44.110.3
R50-P0.1173411702658.8439.24.110.1
R50-P0.3173411702549.0549.04.110.3
), ArticleFig(id=1240702081305203536, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=EN, label=Table 3, caption=

Results of the SHPB test

, figureFileSmall=null, figureFileBig=null, tableContent=
试样编号Specimen气压/MPa Pressure/MPa子弹速度/(m·s-1) Bullet velocity/(m·s-1)应变率/s-1 Strain rate/s-1 f ccs/MPa f ccD/MPa ε ccDIF破坏形态Failure pattern
 0.102.563742.1545.820.00831.09破裂cracked
R300.154.22 破碎broken
 0.205.1590 75.360.00921.79粉碎crushed
 0.102.423339.7441.830.00781.05破裂cracked
R400.153.6951 57.470.00841.45破碎broken
 0.204.4071 74.890.01001.88粉碎crushed
 0.102.8737.81破裂cracked
R500.153.7665 55.430.00721.47破碎broken
 0.204.39 粉碎crushed
 0.102.934644.3154.870.00761.24破裂cracked
R30-P0.10.154.2764 68.380.00821.54破碎broken
 0.204.4185 77.930.00121.76破碎broken
 0.102.885344.5561.500.00841.38轻微龟裂slightly cracked
R30-P0.30.153.55 破裂cracked
 0.204.4580 86.600.01121.94破裂cracked
 0.102.875540.7253.950.00821.32破裂cracked
R40-P0.10.154.3070 58.980.00871.45破碎broken
 0.204.4088 72.260.00981.77破碎broken
 0.102.954842.2052.690.00771.25轻微龟裂slightly cracked
R40-P0.30.154.2775 77.200.01101.83破裂cracked
 0.204.4085 81.800.01101.94破裂cracked
 0.103.144839.8945.930.00621.15破裂cracked
R50-P0.10.154.3267 56.890.00931.43破碎broken
 0.204.4083 66.890.01221.68破碎broken
 0.102.974640.7949.880.00801.22轻微龟裂slightly cracked
R50-P0.30.153.7674 72.960.01081.79破裂cracked
 0.204.4482 76.250.01111.87破裂cracked
), ArticleFig(id=1240702081389089624, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=CN, label=表3, caption=

SHPB实验结果

, figureFileSmall=null, figureFileBig=null, tableContent=
试样编号Specimen气压/MPa Pressure/MPa子弹速度/(m·s-1) Bullet velocity/(m·s-1)应变率/s-1 Strain rate/s-1 f ccs/MPa f ccD/MPa ε ccDIF破坏形态Failure pattern
 0.102.563742.1545.820.00831.09破裂cracked
R300.154.22 破碎broken
 0.205.1590 75.360.00921.79粉碎crushed
 0.102.423339.7441.830.00781.05破裂cracked
R400.153.6951 57.470.00841.45破碎broken
 0.204.4071 74.890.01001.88粉碎crushed
 0.102.8737.81破裂cracked
R500.153.7665 55.430.00721.47破碎broken
 0.204.39 粉碎crushed
 0.102.934644.3154.870.00761.24破裂cracked
R30-P0.10.154.2764 68.380.00821.54破碎broken
 0.204.4185 77.930.00121.76破碎broken
 0.102.885344.5561.500.00841.38轻微龟裂slightly cracked
R30-P0.30.153.55 破裂cracked
 0.204.4580 86.600.01121.94破裂cracked
 0.102.875540.7253.950.00821.32破裂cracked
R40-P0.10.154.3070 58.980.00871.45破碎broken
 0.204.4088 72.260.00981.77破碎broken
 0.102.954842.2052.690.00771.25轻微龟裂slightly cracked
R40-P0.30.154.2775 77.200.01101.83破裂cracked
 0.204.4085 81.800.01101.94破裂cracked
 0.103.144839.8945.930.00621.15破裂cracked
R50-P0.10.154.3267 56.890.00931.43破碎broken
 0.204.4083 66.890.01221.68破碎broken
 0.102.974640.7949.880.00801.22轻微龟裂slightly cracked
R50-P0.30.153.7674 72.960.01081.79破裂cracked
 0.204.4482 76.250.01111.87破裂cracked
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聚乙烯醇纤维再生混凝土动态压缩力学性能试验研究
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彭胜 1a , 吴佳隆 1a , 何理 1b , 钟东望 1b , 谢先启 2 , 蔡路军 1b
爆破 | 理论与技术探索 2025,42(3): 18-25
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爆破 | 理论与技术探索 2025, 42(3): 18-25
聚乙烯醇纤维再生混凝土动态压缩力学性能试验研究
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彭胜1a , 吴佳隆1a, 何理1b , 钟东望1b, 谢先启2, 蔡路军1b
作者信息
  • 1a.武汉科技大学 城市建设学院,武汉 430065
  • 1b.武汉科技大学 冶金工业过程系统科学湖北省重点实验室,武汉 430065
  • 2.江汉大学 精细爆破全国重点实验室,武汉 430056
  • 彭胜(1989-),男,博士、副教授,主要从事工程爆破理论及技术的研究,(E-mail)

    PENG Sheng (1989-), male, Ph.D, associate professor, mainly engaged in research on engineering blasting theory and technology, (E-mail) .

通讯作者:

何理(1986-),男,博士、教授,主要从事智能爆破理论及技术的研究,(E-mail)
Experimental Investigation on Dynamic Compressive Mechanical Properties of PVA Fiber-reinforced Recycled Aggregate Concrete
Sheng PENG1a , Jia-long WU1a, Li HE1b , Dong-wang ZHONG1b, Xian-qi XIE2, Lu-jun CAI1b
Affiliations
  • 1a.College of City Construction, Wuhan 430065, China
  • 1b.Hubei Province Key Laboratory of Systems Science in Metallurgical Process, Wuhan University of Science and Technology, Wuhan 430065, China
  • 2.State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, China
出版时间: 2025-05-15 doi: 10.3963/j.issn.1001-487X.2025.03.003
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为提升再生混凝土(RAC)在动态荷载下的力学性能,研究通过分离式霍普金森压杆(SHPB)动态压缩试验,系统探究了聚乙烯醇(PVA)纤维增强和再生粗骨料(RCA)替代对RAC动态力学性能的协同影响规律。设计36组不同PVA纤维体积掺量(0%、0.1%、0.3%)与RCA取代率(30%、40%、50%)的试样,结合动态应力-应变曲线、破坏形态及动态增长因子(DIF)等指标,揭示了聚乙烯醇纤维再生混凝土(PVA-RAC)在冲击荷载下的损伤机理与增强机制。结果表明:PVA纤维通过桥连作用显著抑制了裂缝扩展,使试样破坏模式由脆性粉碎转为延性龟裂,动态峰值应力与DIF均随纤维掺量和应变率增加显著提升;高RCA取代率(40%~50%)虽因骨料孔隙削弱了强度,但其内部多相界面特征通过复杂裂纹路径增强了能量耗散,部分抵消了强度损失。该成果为PVA-RAC在抗震防护工程中的动态设计与应用提供了理论依据,同时为建筑固废资源化与高性能再生建材的协同发展开辟了新路径,具有理论创新性与工程实践价值。

聚乙烯醇纤维再生混凝土  /  动态压缩  /  力学性能  /  分离式霍普金森压杆  /  动态增长因子

To enhance the mechanical performance of recycled aggregate concrete (RAC) under dynamic loading, this study systematically investigates the synergistic effects of polyvinyl alcohol (PVA) fiber reinforcement and recycled coarse aggregate (RCA) replacement on the dynamic mechanical performance of RAC through split Hopkinson pressure bar (SHPB) impact compression tests. Thirty-six specimen groups with varying PVA fiber dosages (0%, 0.1%, 0.3%) and RCA replacement ratios (30%, 40%, 50%) were designed to elucidate the damage mechanisms and enhancement mechanisms of PVA fiber-reinforced recycled aggregate concrete (PVA-RAC) under impact loading, utilizing comprehensive analyses of dynamic stress-strain curves, failure patterns, and dynamic increase factors (DIF). The results demonstrate that PVA fibers significantly suppress crack propagation via bridging effects, thereby altering the material's failure mode from brittle fragmentation to ductile cracking. Both dynamic peak stress and DIF exhibit substantial improvements with increasing fiber content and strain rate. While higher RCA replacement ratios (40%~50%) diminish compressive strength due to the inherent porosity of RCA, their heterogeneous interfacial properties promote energy dissipation through complex crack propagation paths, thereby partially mitigating strength losses. This study establishes a theoretical framework for the dynamic design and application of PVA-RAC in seismic-resistant protective structures. Furthermore, it pioneers a synergistic approach to integrating construction waste recycling with the development of high-performance recycled building materials. The findings have both theoretical innovation and practical engineering significance.

PVA fiber-reinforced recycled aggregate concrete  /  dynamic compression  /  mechanical property  /  split Hopkinson pressure bar  /  dynamic increase factor
彭胜, 吴佳隆, 何理, 钟东望, 谢先启, 蔡路军. 聚乙烯醇纤维再生混凝土动态压缩力学性能试验研究. 爆破, 2025 , 42 (3) : 18 -25 . DOI: 10.3963/j.issn.1001-487X.2025.03.003
Sheng PENG, Jia-long WU, Li HE, Dong-wang ZHONG, Xian-qi XIE, Lu-jun CAI. Experimental Investigation on Dynamic Compressive Mechanical Properties of PVA Fiber-reinforced Recycled Aggregate Concrete[J]. Blasting, 2025 , 42 (3) : 18 -25 . DOI: 10.3963/j.issn.1001-487X.2025.03.003
我国城市更新加速推进,基础设施建设规模持续扩大,致使建筑垃圾每年超30亿吨的速度激增[1]。建筑固废资源化,是实现建筑垃圾减量化的有效途径[2]。然而,再生混凝土(RAC)存在原始界面过渡区和内部微裂缝等缺陷[3,4],使其在性能方面稍弱于混凝土,难以在抗震结构、防护工程等领域推广[5-7]。通过掺入聚乙烯醇(PVA)纤维来增强RAC的强度和抗裂能力是目前常用的手段,PVA的桥连作用能有效抑制RAC内在裂缝的产生与发展,致使其抗拉强度与韧性方面的提升效果显著。
近年来,国内外学者围绕PVA纤维改性RAC开展了研究[8-13]。在抗裂机制方面,陈英杰等通过力学性能试验[8],证实了PVA纤维的桥连作用可显著抑制RAC横向开裂,并提升其劈裂抗拉与抗折强度。陈宇良等基于摩擦剪切试验与微观分析[9],发现PVA纤维可以起到维持RAC剪切破坏面界面粗糙度的作用。在复合构件力学行为研究中,Yu等通过波纹钢板聚乙烯醇纤维混凝土(PVA-RAC)叠合板抗弯试验发现[10],纤维掺量增加可有效提升构件承载力并减小挠度变形。针对混杂纤维体系,司政等发现玄武岩-PVA纤维的协同作用可优化RAC孔隙结构[11],显著增强其抗冻性能,并指出,混掺纤维的增强效果优于单掺体系。Lin等采用三点弯曲试验[12],证实了PVA纤维能有效改善RAC的断裂性能。蒿昭东进一步通过混杂纤维透水混凝土的研究[13],发现玄武岩-PVA纤维形成的三维网络结构可同时提升材料抗压强度与渗透性能,实现力学与功能的协同优化。然而,这类静态研究成果难以解释冲击荷载下材料的高速变形与能量耗散等特性,制约了PVA-RAC在防护工程中的应用。
值得注意的是,PVA纤维对混凝土动态力学行为的改善已在普通混凝土领域获得验证[14-18]。张炳锋等通过动态压缩试验证实[14],PVA纤维体积掺量的增加可明显改善混凝土冲击破坏模式,使材料破坏形态从脆性崩裂向延性损伤转变,同时动态峰值应力呈现显著的正向增长趋势。杨国梁和韩子默等基于动态冲击试验发现[15,16],PVA纤维的加入可以显著提高混凝土试件的临界裂缝尖端张开位移值,提高试件的阻裂能力。Osman B H等对PVA纤维混凝土动态性能研究发现[17],随着纤维掺量的增加,纤维混凝土抗弯性能逐步增强,且纤维混凝土能有效降低损伤积累率,显著提升混凝土抵抗多次重复冲击荷载的承载能力。Ma等创新性地将负泊松比结构设计与PVA-碳纤维混杂体系相结合证实[18],纤维的掺入显著提升了混凝土的抗冲击强度以及断裂能,并对改善混凝土内部裂缝的产生和发展有积极作用。这些现象表明,PVA纤维可以显著提升混凝土的抗冲击性能,然而,现有研究多聚焦于骨料结构完整的普通混凝土体系,针对再生骨料孔隙-纤维-基体多相界面在动态荷载下的协同响应机制的研究较少。在此背景下,开展PVA-RAC抗冲击性能研究,既是揭示RAC动态损伤机理的理论延伸,也是推动其应用于防护工程结构的关键技术基础。
通过开展不同冲击气压下的SHPB动态压缩试验,系统研究PVA纤维体积掺量和再生粗骨料(RCA)取代率等参数对RAC动态力学特性的影响规律。设计了36个试样,其中27个用于SHPB试验,9个用于静态轴压试验。对不同RCA取代率和PVA纤维体积掺量试样在不同冲击气压下的破坏形态、动态应力-应变曲线、动态峰值应力-应变率和动态增长因子(DIF)进行了详细讨论。
制备PVA-RAC试样的主要原料有水泥、河砂、天然粗骨料、RCA、水、减水剂及不同体积比的PVA。水泥强度等级为P.I 42.5硅酸盐水泥;河砂为中砂,平均细度模数为2.9,颗粒级配符合II类级配区;天然粗骨料和RCA的粒径均为5~20 mm,天然粗骨料为武汉某石场生产的砾石,RCA来自武汉科技大学城市建设学院工程训练中心回收的C30废弃混凝土试件;水为普通自来水;减水剂为HF聚羧酸盐系高效减水剂[19],减水率25%~30%;PVA纤维由上海臣启化工科技有限公司生产,其材料参数如表1所示。
研究不同PVA纤维掺量(0、0.1%、0.3%)和RCA取代率(30%、40%、50%)对PVA-RAC冲击力学性能的影响,采用了9种配合比,如表2所示。为方便起见,对试样进行编号。第一个字母“R”表示RAC,“R”后的数字表示RCA的取代率,第二个字母“P”表示PVA纤维,“P”后的数字表示PVA纤维的体积含量。如试样编号R30-P0.1表示RCA取代率为30%且PVA纤维含量为0.1%的PVA-RAC,配合比由材料性能和多次试验确定。
为了消除惯性效应的影响,设计试样长径比为0.5,即直径为100 mm,高度为50 mm的PVA-RAC圆柱形试样。另对标准条件下养护28 d后的150 mm×150 mm×150 mm的立方体试样进行轴心抗压强度测定。
静态轴压试验在武汉科技大学土木工程试验中心进行,加载设备为全自动压力机,如图1所示。不同配比下标准立方体抗压强度试验结果见表3
动态压缩试验采用0.1 MPa、0.15 MPa和0.20 MPa三种冲击气压控制试样应变率。试验动加载装置使用武汉科技大学理学院动力学实验室100 mm杆径分离式霍普金森压杆试验装置,其由发射端(包括发射腔和子弹)、入射杆、透射杆、缓冲端、测速仪和数据采集单元组成,图2为SHPB装置的原理图。如图2所示子弹、缓冲杆、透射杆和入射杆的长度分别为600 mm、1000 mm、3000 mm、5000 mm,所有杆件均由高强度合金钢(密度为7850 kg/m3、弹性模量为210 GPa)组成。通过调整发射腔内高纯氮气的气压来控制子弹的冲击速度,使试样达到不同的应变率。分别在入射杆和透射杆中间位置上粘贴电阻应变片以半桥对臂的连接方式获取应变数据。同时为了消除端面摩擦效应,将再生混凝土试样与入射杆、透射杆两个接触面均涂抹凡士林,以避免接触面摩擦效应影响试样内部的应力分布。
为了直观对比SHPB试验后的破坏形态,分析RCA取代率(30%、40%、50%)和PVA纤维体积含量(0、0.1%、0.3%)对PVA-RAC动态压缩力学性能的影响,选取不同冲击气压下不同配比PVA-RAC的典型破坏模式,如图3所示。
试样典型破坏形态(Lv和Chen等对素混凝土在SHPB实验中的破坏类型分为了四种形态)如表3所示[20],从宏观破坏现象可以看出,随着冲击气压的增加,试样整体上从边缘破损至中间开裂,最后完全破碎,且破坏块体的尺寸亦越来越小。在0.1 MPa冲击气压下,随着RCA取代率的增加,无纤维增强RAC试样的破坏形态越来越严重,呈现出局部破裂到半块破碎的现象。在高冲击气压下,无纤维增强RAC均表现出整块破碎的现象。对比加入纤维后不同RCA取代率的试样,并未发现明显破坏形态上的差异。
添加PVA纤维后,在相同冲击气压下,PVA-RAC的完整性得到了显著的提高,且随着PVA纤维体积含量的增加该现象更加明显。观察受到冲击后的PVA-RAC试样,多数试样有较好的完整性,在PVA-RAC散落的碎块中依旧有着纤维连接,呈现出“藕断丝连”的破坏状态[21],即使被撞碎,在试样中纤维依然在起着桥连作用,散落的骨料直径明显大于无纤维增强RAC。
试验结果如表3所示。fccs为静态荷载作用下的峰值应力,fccD为动态荷载作用下的峰值应力,εcc为动态峰值应力对应下的应变,DIF为动态增长因子。注意,表3中划短横线的部分为未测量到的数据。从表3可以看出子弹发射速度、应变率和动态峰值应力均随着冲击气压的增大而增大。图4为SHPB试验下试样的动态应力-应变曲线。PVA-RAC动态应力应变曲线可以大致分为3个阶段:弹性阶段、塑性阶段、破坏阶段。弹性阶段和塑性阶段共同组成曲线的上升段,反映了材料的初始刚度及材料特性,峰后曲线为破坏阶段,该段曲线陡降可能伴随波动。
从不同RCA取代率的曲线中可以看出高应变率高纤维掺入RAC的应力-应变曲线包裹了低应变率RAC的压应力-应变曲线。这一现象说明纤维增强RAC具有应变率效应。整体上,随着应变率及纤维体积含量的上升,纤维增强RAC的正弹性模量都有所增加,而这种增加的程度是适度的。并且纤维的加入大大增强了试样的吸能能力和峰值应变,说明PVA纤维的效果显著。部分曲线在达到峰值应力前出现异常波动可能是试样与压杆接触面不平整或存在微小滑动,使得加载初期应力分布不均,偏心加载引发局部应力集中,表现为曲线波动。
图5为相同PVA纤维体积含量和不同RCA取代率下PVA-RAC的动态峰值应力-应变率曲线。当PVA纤维体积含量为0%时,在应变率相近的情况下,PVA-RAC的峰值应力随RCA取代率的增加而减小。在加入PVA纤维后亦表现出与未加PVA纤维试样相似的峰值应力变化规律。
图6为相同RCA取代率和不同PVA纤维体积含量下PVA-RAC的动态应力-应变率曲线。在相近应变率下,PVA-RAC的峰值应力随PVA纤维体积含量的增加而增加。与其他情况不同的是,当RCA取代率为40%时,加入PVA纤维试样的峰值应力没有达到预期值。该现象有可能是在制备试样中纤维分散不均,应力集中于纤维团簇周围,加速裂纹贯通,削弱了整体承载能力。
动态增长因子(dynamic increase factors,简称DIF)为动态强度与静态强度的比值,反映了材料在高应变率加载下的强度增强效应,一般表示为应变率的函数。对于每种试样,DIF均随应变率升高而显著提升,如R30在0.1 MPa气压下DIF为1.09,在0.2 MPa气压下DIF为1.79,R40~P0.3在0.1 MPa下DIF为1.25,在0.1 MPa气压下DIF为1.94。当PVA纤维体积含量相同时,DIF随着RCA取代率的增加而增加,例如R30在0.2 MPa气压下DIF为1.79,R40在同等条件下DIF为1.88,这表明再生骨料孔隙率较高,在高应变率下裂纹扩展路径复杂化,导致能量耗散增强,从而提升了动态强度。
当RCA取代率相同时,DIF随PVA纤维体积含量的增加而增大,这是因为PVA纤维在动态加载中通过桥接微裂纹,延缓裂纹扩展并分散应力集中,减少突发性破坏,从而提升了动态强度;但有少部分试样的DIF值随着PVA纤维含量的增加反而降低了,例如R50在0.15 MPa气压下DIF为1.47,R50~P0.1在0.15气压下DIF为1.43,这可能是纤维局部团聚,形成弱界面区,导致应力集中,削弱了DIF的增幅。
研究通过SHPB动态压缩试验研究了PVA纤维体积掺量(0%、0.1%、0.3%)与RCA取代率(30%、40%、50%)对PVA-RAC动态力学性能的影响,得出以下结论:
(1)PVA纤维通过桥接作用有效抑制了裂缝扩展,改善了试样的破坏形态。相较于无纤维试样,纤维掺量为0.3%时,试样在高应变率下的破坏形态由粉碎转为轻微龟裂的延性破坏,碎块完整性提升,动态抗压强度与能量耗散能力显著增强。
(2)动态峰值应力与DIF均随应变率及纤维掺量的增加呈正相关。高冲击气压(0.2 MPa)下,纤维掺量0.3%的试样动态强度较静态强度提升了94%,这表明PVA纤维在动态荷载下通过应力重分布延缓了突发性破坏,增强了材料韧性。
(3)RCA取代率的提高虽会导致RAC动态强度的降低,但高孔隙率再生骨料内部复杂的裂纹扩展路径可显著促进能量耗散机制,从而部分补偿强度损失。这种动态强度折减与能量耗散增强的竞争效应导致动态增强因子随取代率增加呈现上升趋势。例如R40试样在0.2 MPa冲击气压下的DIF为1.88,高于同条件下R30试样的DIF(1.79),印证了再生骨料孔隙特征对动态力学响应的正向调控作用。
(4)纤维分散不均可能引发局部弱界面区,削弱增强效果。如R50-P0.1试样在0.15 MPa冲击气压下的DIF(1.43)低于同取代率无纤维试样(1.47)。因此,需优化纤维分散工艺以保障性能稳定性。
  • 湖北省自然科学基金资助项目(2022CFB662)
  • 武汉市知识创新专项项目曙光计划项目(2023020201020403)
  • 江汉大学精细爆破全国重点实验室开放基金(PBSKL2022D05)
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doi: 10.3963/j.issn.1001-487X.2025.03.003
  • 接收时间:2025-04-08
  • 首发时间:2026-03-17
  • 出版时间:2025-05-15
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  • 收稿日期:2025-04-08
基金
Natural Science Foundation of Hubei Province funding project(2022CFB662)
湖北省自然科学基金资助项目(2022CFB662)
Wuhan Knowledge Innovation Special Project Dawn Plan Project(2023020201020403)
武汉市知识创新专项项目曙光计划项目(2023020201020403)
Open Fund of State Key Laboratory of Precision Blasting, Jianghan University(PBSKL2022D05)
江汉大学精细爆破全国重点实验室开放基金(PBSKL2022D05)
作者信息
    1a.武汉科技大学 城市建设学院,武汉 430065
    1b.武汉科技大学 冶金工业过程系统科学湖北省重点实验室,武汉 430065
    2.江汉大学 精细爆破全国重点实验室,武汉 430056

通讯作者:

何理(1986-),男,博士、教授,主要从事智能爆破理论及技术的研究,(E-mail)
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https://castjournals.cast.org.cn/joweb/bp/CN/10.3963/j.issn.1001-487X.2025.03.003
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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