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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)
empheli@hotmail.com.
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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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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)pengsheng@wust.edu.cn。
PENG Sheng (1989-), male, Ph.D, associate professor, mainly engaged in research on engineering blasting theory and technology, (E-mail) pengshencg@wust.edu.cn.
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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)pengsheng@wust.edu.cn。
PENG Sheng (1989-), male, Ph.D, associate professor, mainly engaged in research on engineering blasting theory and technology, (E-mail) pengshencg@wust.edu.cn.
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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)pengsheng@wust.edu.cn。
PENG Sheng (1989-), male, Ph.D, associate professor, mainly engaged in research on engineering blasting theory and technology, (E-mail) pengshencg@wust.edu.cn.
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2.State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1240702076993458792, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, authorId=1240702076808909410, language=CN, stringName=谢先启, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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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, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1240702074074223140, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, xref=1b., ext=[AuthorCompanyExt(id=1240702074082611749, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, companyId=1240702074074223140, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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2021. (in Chinese), articleTitle=Research and numerical analysis on impact resistance of basalt fiber and polypropylene fiber reinforced concrete, refAbstract=null)], funds=[Fund(id=1240702081548473188, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, awardId=2022CFB662, language=EN, fundingSource=Natural Science Foundation of Hubei Province funding project(2022CFB662), fundOrder=null, country=null), Fund(id=1240702081636553582, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, awardId=2022CFB662, language=CN, fundingSource=湖北省自然科学基金资助项目(2022CFB662), fundOrder=null, country=null), Fund(id=1240702081733022580, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, awardId=2023020201020403, language=EN, fundingSource=Wuhan Knowledge Innovation Special Project Dawn Plan Project(2023020201020403), fundOrder=null, country=null), Fund(id=1240702081829491583, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, awardId=2023020201020403, language=CN, fundingSource=武汉市知识创新专项项目曙光计划项目(2023020201020403), fundOrder=null, country=null), Fund(id=1240702081917571975, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, awardId=PBSKL2022D05, language=EN, fundingSource=Open Fund of State Key Laboratory of Precision Blasting, Jianghan University(PBSKL2022D05), fundOrder=null, country=null), Fund(id=1240702081997263759, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, awardId=PBSKL2022D05, language=CN, fundingSource=江汉大学精细爆破全国重点实验室开放基金(PBSKL2022D05), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1240702073948394012, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, xref=1a., ext=[AuthorCompanyExt(id=1240702073952588316, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, companyId=1240702073948394012, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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2.江汉大学 精细爆破全国重点实验室,武汉 430056)])], figs=[ArticleFig(id=1240702078323053249, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=EN, label=Fig. 1, caption=
Static compression testing machine, figureFileSmall=eLDl0t/4UmkUyJeXPXigXA==, figureFileBig=dMGKICmZPeNdRPvUE0YFSg==, tableContent=null), ArticleFig(id=1240702078436299466, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=CN, label=图1, caption=
静态压缩试验机, figureFileSmall=eLDl0t/4UmkUyJeXPXigXA==, figureFileBig=dMGKICmZPeNdRPvUE0YFSg==, tableContent=null), ArticleFig(id=1240702078604071644, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=EN, label=Fig. 2, caption=
Test setup of Split Hopkinson Pressure Bar(unit:mm), figureFileSmall=6PZ9fPwqRLqMVgCW2cT/jA==, figureFileBig=CXAWHIzjmAU9QuThjmZlLw==, tableContent=null), ArticleFig(id=1240702078687957728, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=CN, label=图2, caption=
分离式霍普金森压杆试验装置(单位:mm), figureFileSmall=6PZ9fPwqRLqMVgCW2cT/jA==, figureFileBig=CXAWHIzjmAU9QuThjmZlLw==, tableContent=null), ArticleFig(id=1240702078763455209, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=EN, label=Fig. 3, caption=
Failure modes of the test specimens under different impact pressures, figureFileSmall=vBHpFHCTtk2te9lOdVEz+g==, figureFileBig=6bBNG8OXPQA3mtKtor9ndw==, tableContent=null), ArticleFig(id=1240702078838952691, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=CN, label=图3, caption=
不同冲击气压下试样的破坏形态, figureFileSmall=vBHpFHCTtk2te9lOdVEz+g==, figureFileBig=6bBNG8OXPQA3mtKtor9ndw==, tableContent=null), ArticleFig(id=1240702078960587513, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=EN, label=Fig. 4, caption=
The stress-strain curves of RCA with different replacement ratios, figureFileSmall=oqaeZ/26/BsXdQRC4d+S9w==, figureFileBig=/pb1tkv3+ZLZNQd+IOATgw==, tableContent=null), ArticleFig(id=1240702079027696383, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=CN, label=图4, caption=
不同再生粗骨料取代率的应力应变曲线, figureFileSmall=oqaeZ/26/BsXdQRC4d+S9w==, figureFileBig=/pb1tkv3+ZLZNQd+IOATgw==, tableContent=null), ArticleFig(id=1240702080512480014, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=EN, label=Fig. 5, caption=
Effect of RCA replacement ratio on peak stress-strain rate curves of specimens, figureFileSmall=t7+wJtJLwBVzsVFI24L2sg==, figureFileBig=8KiAeXmT1lVcy9u0A/Kxcg==, tableContent=null), ArticleFig(id=1240702080596366099, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=CN, label=图5, caption=
再生粗骨料取代率对试样峰值应力-应变率曲线的影响, figureFileSmall=t7+wJtJLwBVzsVFI24L2sg==, figureFileBig=8KiAeXmT1lVcy9u0A/Kxcg==, tableContent=null), ArticleFig(id=1240702080676057880, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=EN, label=Fig. 6, caption=
Effect of PVA fiber volume ratio on peak stress-strain rate curves of specimens, figureFileSmall=RzZo4TYTlXB8m33TmI+ztQ==, figureFileBig=3yDSoAPAqIjHnXyIitF7gg==, tableContent=null), ArticleFig(id=1240702080768332578, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=CN, label=图6, caption=
PVA纤维体积比对试样峰值应力-应变率曲线的影响, figureFileSmall=RzZo4TYTlXB8m33TmI+ztQ==, figureFileBig=3yDSoAPAqIjHnXyIitF7gg==, tableContent=null), ArticleFig(id=1240702080885773099, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1240702072383918566, language=EN, label=Table 1, caption=
Characteristic of polyvinyl alcohol fiber material
, 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 |
|---|
| 12 | 15.3 | 1.29 | 7 | 1830 |
), 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 |
|---|
| 12 | 15.3 | 1.29 | 7 | 1830 |
), 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 |
|---|
| R30 | 173 | 411 | 702 | 768.6 | 329.4 | 4.11 | - |
| R40 | 173 | 411 | 702 | 658.8 | 439.2 | 4.11 | - |
| R50 | 173 | 411 | 702 | 549.0 | 549.0 | 4.11 | - |
| R30-P0.1 | 173 | 411 | 702 | 768.6 | 329.4 | 4.11 | 0.1 |
| R30-P0.3 | 173 | 411 | 702 | 658.8 | 439.2 | 4.11 | 0.3 |
| R40-P0.1 | 173 | 411 | 702 | 549.0 | 549.0 | 4.11 | 0.1 |
| R40-P0.3 | 173 | 411 | 702 | 768.6 | 329.4 | 4.11 | 0.3 |
| R50-P0.1 | 173 | 411 | 702 | 658.8 | 439.2 | 4.11 | 0.1 |
| R50-P0.3 | 173 | 411 | 702 | 549.0 | 549.0 | 4.11 | 0.3 |
), 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 |
|---|
| R30 | 173 | 411 | 702 | 768.6 | 329.4 | 4.11 | - |
| R40 | 173 | 411 | 702 | 658.8 | 439.2 | 4.11 | - |
| R50 | 173 | 411 | 702 | 549.0 | 549.0 | 4.11 | - |
| R30-P0.1 | 173 | 411 | 702 | 768.6 | 329.4 | 4.11 | 0.1 |
| R30-P0.3 | 173 | 411 | 702 | 658.8 | 439.2 | 4.11 | 0.3 |
| R40-P0.1 | 173 | 411 | 702 | 549.0 | 549.0 | 4.11 | 0.1 |
| R40-P0.3 | 173 | 411 | 702 | 768.6 | 329.4 | 4.11 | 0.3 |
| R50-P0.1 | 173 | 411 | 702 | 658.8 | 439.2 | 4.11 | 0.1 |
| R50-P0.3 | 173 | 411 | 702 | 549.0 | 549.0 | 4.11 | 0.3 |
), 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 cc,s/MPa | f cc,D/MPa | ε cc | DIF | 破坏形态Failure pattern |
|---|
| | 0.10 | 2.56 | 37 | 42.15 | 45.82 | 0.0083 | 1.09 | 破裂cracked |
| R30 | 0.15 | 4.22 | — | | — | — | — | 破碎broken |
| | 0.20 | 5.15 | 90 | | 75.36 | 0.0092 | 1.79 | 粉碎crushed |
| | 0.10 | 2.42 | 33 | 39.74 | 41.83 | 0.0078 | 1.05 | 破裂cracked |
| R40 | 0.15 | 3.69 | 51 | | 57.47 | 0.0084 | 1.45 | 破碎broken |
| | 0.20 | 4.40 | 71 | | 74.89 | 0.0100 | 1.88 | 粉碎crushed |
| | 0.10 | 2.87 | — | 37.81 | — | — | — | 破裂cracked |
| R50 | 0.15 | 3.76 | 65 | | 55.43 | 0.0072 | 1.47 | 破碎broken |
| | 0.20 | 4.39 | — | | — | — | — | 粉碎crushed |
| | 0.10 | 2.93 | 46 | 44.31 | 54.87 | 0.0076 | 1.24 | 破裂cracked |
| R30-P0.1 | 0.15 | 4.27 | 64 | | 68.38 | 0.0082 | 1.54 | 破碎broken |
| | 0.20 | 4.41 | 85 | | 77.93 | 0.0012 | 1.76 | 破碎broken |
| | 0.10 | 2.88 | 53 | 44.55 | 61.50 | 0.0084 | 1.38 | 轻微龟裂slightly cracked |
| R30-P0.3 | 0.15 | 3.55 | — | | — | — | — | 破裂cracked |
| | 0.20 | 4.45 | 80 | | 86.60 | 0.0112 | 1.94 | 破裂cracked |
| | 0.10 | 2.87 | 55 | 40.72 | 53.95 | 0.0082 | 1.32 | 破裂cracked |
| R40-P0.1 | 0.15 | 4.30 | 70 | | 58.98 | 0.0087 | 1.45 | 破碎broken |
| | 0.20 | 4.40 | 88 | | 72.26 | 0.0098 | 1.77 | 破碎broken |
| | 0.10 | 2.95 | 48 | 42.20 | 52.69 | 0.0077 | 1.25 | 轻微龟裂slightly cracked |
| R40-P0.3 | 0.15 | 4.27 | 75 | | 77.20 | 0.0110 | 1.83 | 破裂cracked |
| | 0.20 | 4.40 | 85 | | 81.80 | 0.0110 | 1.94 | 破裂cracked |
| | 0.10 | 3.14 | 48 | 39.89 | 45.93 | 0.0062 | 1.15 | 破裂cracked |
| R50-P0.1 | 0.15 | 4.32 | 67 | | 56.89 | 0.0093 | 1.43 | 破碎broken |
| | 0.20 | 4.40 | 83 | | 66.89 | 0.0122 | 1.68 | 破碎broken |
| | 0.10 | 2.97 | 46 | 40.79 | 49.88 | 0.0080 | 1.22 | 轻微龟裂slightly cracked |
| R50-P0.3 | 0.15 | 3.76 | 74 | | 72.96 | 0.0108 | 1.79 | 破裂cracked |
| | 0.20 | 4.44 | 82 | | 76.25 | 0.0111 | 1.87 | 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 cc,s/MPa | f cc,D/MPa | ε cc | DIF | 破坏形态Failure pattern |
|---|
| | 0.10 | 2.56 | 37 | 42.15 | 45.82 | 0.0083 | 1.09 | 破裂cracked |
| R30 | 0.15 | 4.22 | — | | — | — | — | 破碎broken |
| | 0.20 | 5.15 | 90 | | 75.36 | 0.0092 | 1.79 | 粉碎crushed |
| | 0.10 | 2.42 | 33 | 39.74 | 41.83 | 0.0078 | 1.05 | 破裂cracked |
| R40 | 0.15 | 3.69 | 51 | | 57.47 | 0.0084 | 1.45 | 破碎broken |
| | 0.20 | 4.40 | 71 | | 74.89 | 0.0100 | 1.88 | 粉碎crushed |
| | 0.10 | 2.87 | — | 37.81 | — | — | — | 破裂cracked |
| R50 | 0.15 | 3.76 | 65 | | 55.43 | 0.0072 | 1.47 | 破碎broken |
| | 0.20 | 4.39 | — | | — | — | — | 粉碎crushed |
| | 0.10 | 2.93 | 46 | 44.31 | 54.87 | 0.0076 | 1.24 | 破裂cracked |
| R30-P0.1 | 0.15 | 4.27 | 64 | | 68.38 | 0.0082 | 1.54 | 破碎broken |
| | 0.20 | 4.41 | 85 | | 77.93 | 0.0012 | 1.76 | 破碎broken |
| | 0.10 | 2.88 | 53 | 44.55 | 61.50 | 0.0084 | 1.38 | 轻微龟裂slightly cracked |
| R30-P0.3 | 0.15 | 3.55 | — | | — | — | — | 破裂cracked |
| | 0.20 | 4.45 | 80 | | 86.60 | 0.0112 | 1.94 | 破裂cracked |
| | 0.10 | 2.87 | 55 | 40.72 | 53.95 | 0.0082 | 1.32 | 破裂cracked |
| R40-P0.1 | 0.15 | 4.30 | 70 | | 58.98 | 0.0087 | 1.45 | 破碎broken |
| | 0.20 | 4.40 | 88 | | 72.26 | 0.0098 | 1.77 | 破碎broken |
| | 0.10 | 2.95 | 48 | 42.20 | 52.69 | 0.0077 | 1.25 | 轻微龟裂slightly cracked |
| R40-P0.3 | 0.15 | 4.27 | 75 | | 77.20 | 0.0110 | 1.83 | 破裂cracked |
| | 0.20 | 4.40 | 85 | | 81.80 | 0.0110 | 1.94 | 破裂cracked |
| | 0.10 | 3.14 | 48 | 39.89 | 45.93 | 0.0062 | 1.15 | 破裂cracked |
| R50-P0.1 | 0.15 | 4.32 | 67 | | 56.89 | 0.0093 | 1.43 | 破碎broken |
| | 0.20 | 4.40 | 83 | | 66.89 | 0.0122 | 1.68 | 破碎broken |
| | 0.10 | 2.97 | 46 | 40.79 | 49.88 | 0.0080 | 1.22 | 轻微龟裂slightly cracked |
| R50-P0.3 | 0.15 | 3.76 | 74 | | 72.96 | 0.0108 | 1.79 | 破裂cracked |
| | 0.20 | 4.44 | 82 | | 76.25 | 0.0111 | 1.87 | 破裂cracked |
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