Article(id=1241756511672791478, tenantId=1146029695717560320, journalId=1240670690148397066, issueId=1241699613942543237, articleNumber=null, orderNo=null, doi=10.3963/j.issn.1001-487X.2024.03.018, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1689523200000, receivedDateStr=2023-07-17, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1773987423103, onlineDateStr=2026-03-20, pubDate=1725120000000, pubDateStr=2024-09-01, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773987423103, onlineIssueDateStr=2026-03-20, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773987423103, creator=13701087609, updateTime=1773987423103, updator=13701087609, issue=Issue{id=1241699613942543237, tenantId=1146029695717560320, journalId=1240670690148397066, year='2024', volume='41', issue='3', pageStart='1', pageEnd='260', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1773973857626, creator=13701087609, updateTime=1773992982583, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1241779829880721843, tenantId=1146029695717560320, journalId=1240670690148397066, issueId=1241699613942543237, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1241779829880721844, tenantId=1146029695717560320, journalId=1240670690148397066, issueId=1241699613942543237, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=149, endPage=155, ext={EN=ArticleExt(id=1241756511962198471, articleId=1241756511672791478, tenantId=1146029695717560320, journalId=1240670690148397066, language=EN, title=Impact Resistance of EPS Concrete at Early Ages, columnId=1240702072073548400, journalTitle=Blasting, columnName=EXPLOSIVE DEMOLITION, runingTitle=null, highlight=null, articleAbstract=

Dynamic mechanical tests were carried out on EPS concrete at early ages (12 h、24 h and 36 h). Whereafter, the influences of impact velocity (4.5~6.5 m/s) and age (12 h、24 h and 36 h) on impact resistance of EPS concrete were analyzed in terms of dynamic compressive strength, peak strain, ultimate strain and energy dissipation density. Additionally, the properties of EPS concrete at early ages were compared with that at the age of 28 d. The results show that the dynamic compressive strength, peak strain, ultimate strain, and energy dissipation density of EPS concrete have an impact on the velocity-strengthening effect. With the increase of age, the dynamic mechanical property indicators of EPS concrete and its sensitivity to impact velocity increase. At the age of 28 d, the dynamic compressive strength, peak strain, ultimate strain and dissipation density of EPS concrete are the maximum, and its sensitivity to impact velocity is the strongest. EPS concrete has good deformation and energy absorption characteristics at the early age. At the age of 36 h, the peak strain, ultimate strain and energy dissipation density of EPS concrete can reach 66%~82%, 91%~93% and 72%~78% of that at the age of 28 d, respectively.

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对早龄期(12 h、24 h、36 h)的EPS混凝土进行了动态力学试验,从动态抗压强度、峰值应变、极限应变和能耗密度等方面分析了冲击速度(4.5~6.5 m/s)和龄期(12 h、24 h、36 h)对EPS混凝土抗冲击性能的影响,并与28 d龄期时EPS混凝土的性能进行了对比。结果表明:EPS混凝土的动态抗压强度、峰值应变、极限应变和能耗密度均具有冲击速度强化效应。随着龄期的增大,EPS混凝土的动态力学性能指标及其对冲击速度的敏感性不断增大。28 d龄期时,EPS混凝土的动态抗压强度、峰值应变、极限应变和能耗密度最大,其对冲击速度的敏感性最强。EPS混凝土早龄期具有良好的变形和吸能特性。36 h龄期时,EPS混凝土的峰值应变、极限应变和能耗密度分别可达到28 d龄期时的66%~82%、91%~93%和72%~78%。

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周静(1979-),女,硕士、讲师,主要从事道路桥梁工程方面的研究,(E-mail)

ZHOU Jing (1979-), female, master degree, mainly engaged in road and bridge engineering research, (E-mail) .

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周静(1979-),女,硕士、讲师,主要从事道路桥梁工程方面的研究,(E-mail)

ZHOU Jing (1979-), female, master degree, mainly engaged in road and bridge engineering research, (E-mail) .

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周静(1979-),女,硕士、讲师,主要从事道路桥梁工程方面的研究,(E-mail)

ZHOU Jing (1979-), female, master degree, mainly engaged in road and bridge engineering research, (E-mail) .

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Mix ratio of EPS concrete (unit: kg/m3)

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水泥粉煤灰硅灰EPS颗粒减水剂早强剂速凝剂
386213.529.68215386101845.939.6511.58
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EPS混凝土的配合比(单位:kg/m3

, figureFileSmall=null, figureFileBig=null, tableContent=
水泥粉煤灰硅灰EPS颗粒减水剂早强剂速凝剂
386213.529.68215386101845.939.6511.58
), ArticleFig(id=1241756529007849763, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241756511672791478, language=EN, label=Table 2, caption=

Dynamic mechanical tests results

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龄期冲击速度/(m·s-1动态抗压强度/MPa峰值应变/10-3极限应变/10-3能耗密度/(J·cm-3
12 h4.514.55.3012.4415.7
5.015.75.7015.1916.7
5.516.75.9618.2617.4
6.017.26.1419.9918.0
6.518.96.3022.3419.0
24 h4.520.75.6013.0722.7
5.023.36.1016.5424.7
5.525.76.4520.0626.0
6.027.86.6522.3928.8
6.529.87.4124.1930.3
36 h4.524.25.9914.1227.2
5.030.36.4417.9033.3
5.534.57.2021.0936.4
6.036.57.8923.6539.5
6.538.78.2825.7041.4
28 d4.537.77.3415.2037.7
5.043.67.9519.4142.6
5.550.98.8323.1048.9
6.054.610.4725.6151.6
6.559.012.5127.9755.0
), ArticleFig(id=1241756529142067500, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241756511672791478, language=CN, label=表2, caption=

动态力学试验结果

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龄期冲击速度/(m·s-1动态抗压强度/MPa峰值应变/10-3极限应变/10-3能耗密度/(J·cm-3
12 h4.514.55.3012.4415.7
5.015.75.7015.1916.7
5.516.75.9618.2617.4
6.017.26.1419.9918.0
6.518.96.3022.3419.0
24 h4.520.75.6013.0722.7
5.023.36.1016.5424.7
5.525.76.4520.0626.0
6.027.86.6522.3928.8
6.529.87.4124.1930.3
36 h4.524.25.9914.1227.2
5.030.36.4417.9033.3
5.534.57.2021.0936.4
6.036.57.8923.6539.5
6.538.78.2825.7041.4
28 d4.537.77.3415.2037.7
5.043.67.9519.4142.6
5.550.98.8323.1048.9
6.054.610.4725.6151.6
6.559.012.5127.9755.0
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EPS混凝土的早龄期抗冲击性能
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周静 1 , 王文飞 2 , 胡南 3
爆破 | 拆除爆破 2024,41(3): 149-155
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爆破 | 拆除爆破 2024, 41(3): 149-155
EPS混凝土的早龄期抗冲击性能
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周静1 , 王文飞2, 胡南3
作者信息
  • 1.太原城市职业技术学院 城建系,太原 030027
  • 2.中交第一公路勘察设计研究院有限公司,西安 710075
  • 3.郑州大学 土木工程学院,郑州 450001
  • 周静(1979-),女,硕士、讲师,主要从事道路桥梁工程方面的研究,(E-mail)

    ZHOU Jing (1979-), female, master degree, mainly engaged in road and bridge engineering research, (E-mail) .

Impact Resistance of EPS Concrete at Early Ages
Jing ZHOU1 , Wen-fei WANG2, Nan HU3
Affiliations
  • 1.Department of Urban Construction, Taiyuan City Vocational College, Taiyuan 030027, China
  • 2.CCCC First Highway Consultants Co., Ltd., Xi'an 710075, China
  • 3.School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
出版时间: 2024-09-01 doi: 10.3963/j.issn.1001-487X.2024.03.018
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对早龄期(12 h、24 h、36 h)的EPS混凝土进行了动态力学试验,从动态抗压强度、峰值应变、极限应变和能耗密度等方面分析了冲击速度(4.5~6.5 m/s)和龄期(12 h、24 h、36 h)对EPS混凝土抗冲击性能的影响,并与28 d龄期时EPS混凝土的性能进行了对比。结果表明:EPS混凝土的动态抗压强度、峰值应变、极限应变和能耗密度均具有冲击速度强化效应。随着龄期的增大,EPS混凝土的动态力学性能指标及其对冲击速度的敏感性不断增大。28 d龄期时,EPS混凝土的动态抗压强度、峰值应变、极限应变和能耗密度最大,其对冲击速度的敏感性最强。EPS混凝土早龄期具有良好的变形和吸能特性。36 h龄期时,EPS混凝土的峰值应变、极限应变和能耗密度分别可达到28 d龄期时的66%~82%、91%~93%和72%~78%。

EPS混凝土  /  抗冲击性能  /  龄期  /  变形特性  /  吸能特性

Dynamic mechanical tests were carried out on EPS concrete at early ages (12 h、24 h and 36 h). Whereafter, the influences of impact velocity (4.5~6.5 m/s) and age (12 h、24 h and 36 h) on impact resistance of EPS concrete were analyzed in terms of dynamic compressive strength, peak strain, ultimate strain and energy dissipation density. Additionally, the properties of EPS concrete at early ages were compared with that at the age of 28 d. The results show that the dynamic compressive strength, peak strain, ultimate strain, and energy dissipation density of EPS concrete have an impact on the velocity-strengthening effect. With the increase of age, the dynamic mechanical property indicators of EPS concrete and its sensitivity to impact velocity increase. At the age of 28 d, the dynamic compressive strength, peak strain, ultimate strain and dissipation density of EPS concrete are the maximum, and its sensitivity to impact velocity is the strongest. EPS concrete has good deformation and energy absorption characteristics at the early age. At the age of 36 h, the peak strain, ultimate strain and energy dissipation density of EPS concrete can reach 66%~82%, 91%~93% and 72%~78% of that at the age of 28 d, respectively.

EPS concrete  /  impact resistance  /  age  /  deformation characteristic  /  energy absorption characteristic
周静, 王文飞, 胡南. EPS混凝土的早龄期抗冲击性能. 爆破, 2024 , 41 (3) : 149 -155 . DOI: 10.3963/j.issn.1001-487X.2024.03.018
Jing ZHOU, Wen-fei WANG, Nan HU. Impact Resistance of EPS Concrete at Early Ages[J]. Blasting, 2024 , 41 (3) : 149 -155 . DOI: 10.3963/j.issn.1001-487X.2024.03.018
地下工程常在经受施工扰动、地震、爆炸等冲击荷载后变形破坏,支护结构通过吸收冲击波能量可降低其破坏程度[1]。因此采用变形吸能特性良好的材料作为支护结构可对地下工程起到很好的保护作用[2]。已有很多学者对于支护结构吸能材料进行了研究,主要集中在泡沫混凝土[3,4]、轻骨料混凝土材料等方面[5,6],具有代表性的如EPS(聚苯乙烯)混凝土[7,8]。EPS混凝土具有较好的能量耗散与吸收性能,该材料在冲击荷载下能够充分变形以减轻冲击波对建筑物的破坏,现广泛应用于军用防护工程、民用支护工程中。
国内外学者对冲击荷载下EPS混凝土的力学性能进行了大量研究。Hu等研究了高应变率下EPS混凝土的力学性能[9],发现随着EPS掺量的增大,混凝土的强度降低但韧性增强。Bai等研究了冲击荷载下EPS混凝土的变形特性[10],发现EPS可以提高混凝土的变形能力,且EPS掺量为40%时,提高效果最佳。Zhao等研究了冲击荷载下EPS混凝土的吸能特性[11],发现随着EPS掺量的增大,混凝土的比能量吸收先增大后减小。胡俊等研究了EPS混凝土细观动态损伤[12],发现随着EPS掺量和EPS-水泥浆体界面的增加,混凝土的变形能力不断增强。
上述研究多集中于28 d龄期时冲击荷载下EPS混凝土的力学性能方面,而对于早龄期EPS混凝土抗冲击性能方面的研究还略有不足。国内外地下工程一般采用钻爆法开挖,实际施工过程中,支护结构混凝土常在未达到标准养护龄期时受到爆破施工的扰动[13,14]。鉴于此,本文对12 h、24 h、36 h和28 d龄期的EPS混凝土进行了动态力学试验,研究了EPS混凝土的早龄期抗冲击性能。
试验材料包括水泥、粉煤灰、硅灰、砂、石、EPS颗粒、水、减水剂、早强剂和速凝剂。水泥:秦岭牌42.5R P·O水泥。粉煤灰:韩城电厂F类(级粉煤灰。硅灰:成都布氏机械工程有限公司生产的硅灰,比表面积为18 m2/g。砂:灞河中砂,细度模数为2.78,堆积密度为2630 kg/m3。石:泾阳县石灰岩碎石,堆积密度为2700 kg/m3。EPS颗粒:高陵县泡沫厂生产的再生EPS颗粒,粒径为2~8 mm,堆积密度为25 kg/m3。减水剂:广州建宝新型建材有限公司生产的FDN高效复合减水剂。早强剂与速凝剂:陕西骏仁新型建材有限公司生产的JR-7型早强剂和JR型速凝剂。制备尺寸为ϕ 100 mm×50 mm的混凝土试件,混凝土的配合比如表1所示。试件制备时,EPS颗粒体积掺量为40%。试件的制备流程如图1所示。
采用ϕ 100 mm SHPB设备(如图2所示)对12 h、24 h、36 h和28 d龄期时的EPS混凝土进行了不同冲击速度(4.5 m/s、5.0 m/s、5.5 m/s、6.0 m/s、7.0 m/s)的动态力学试验。
对于混凝土类脆性材料的动态力学试验,试件在达到峰值应变前,满足应力均匀性是保证试验结果可靠性的关键。波形整形技术可以延长入射波的上升沿,让试件有足够的时间达到应力均匀。试验时,采用H62黄铜片作为波形整形器对入射波进行整形。整形前后入射波的对比如图3所示。由图可知,未使用波形整形器时,入射波上升沿时间很短,仅有88.75 μs,且存在高频振荡。试件还没达到应力均匀就已经破坏或接近破坏,试验结果很难反映混凝土真实的动态力学性能。使用波形整形器后,入射波呈现半正弦状,上升沿的时间可达200 μs~250 μs,为试件达到应力均匀提供了充足的时间。此外,波形整形器还可以平滑波形,消除高频振荡,从而减少应力波在长距离传播中的弥散失真。
根据应力均匀假设(入射波+反射波=透射波)可直观地判断试件的应力均匀情况。整形后的波形图对比如图4所示。由图可知,使用波形整形器后,入射波和反射波的叠加与透射波非常吻合,试件基本达到应力均匀状态。由此可见,动态力学试验能够较好地满足应力均匀性要求,进而保证了试验的有效性与结果的可靠性。试验数据采用“三波法”处理,动态力学试验结果如表2所示。
动态抗压强度(fcd)为EPS混凝土动态应力-应变曲线上的峰值应力,表征EPS混凝土的强度特性。冲击荷载下EPS混凝土的动态抗压强度如图5所示。由图可知,不同龄期下EPS混凝土的动态抗压强度均具有冲击速度强化效应。相同龄期时,随着冲击速度的增大,EPS混凝土的动态抗压强度不断增大。冲击速度相同时,随着龄期的增大,EPS混凝土的动态抗压强度不断增大。且随着龄期的增大,EPS混凝土动态抗压强度的冲击速度强化效应越显著,即冲击速度增大幅度相同时,随着龄期的增大,EPS混凝土动态抗压强度的增大幅度逐渐增大。采用函数fcd=A1+B1V对数据拟合,拟合结果如式(1)所示。相关系数R2均大于0.92,表明拟合效果良好。拟合直线的斜率B1为动态抗压强度的冲击速度效应系数,反映了EPS混凝土动态抗压强度对冲击速度的敏感性。B1越大,动态抗压强度对冲击速度的敏感性越强,则动态抗压强度的冲击速度强化效应越显著。随着龄期的增大,EPS混凝土的B1不断增大,动态抗压强度对冲击速度的敏感性不断增强。12 h龄期时,EPS混凝土的B1为2.06,24 h、36 h龄期时,EPS混凝土的B1较12 h龄期时分别增大了120.39%、241.75%。36 h龄期时,EPS混凝土的B1可达到28 d龄期时的65.67%。为了表征EPS混凝土早龄期时强度特性的发展程度,定义fcdt/28 d)为早龄期时EPS混凝土的动态抗压强度与28 d龄期时动态抗压强度的比值。EPS混凝土的fcdt/28 d)如图6所示。由图可知,随着龄期的增大,EPS的fcdt/28 d)不断增大。EPS混凝土的fcd(12 h/28 d)为31%~38%,fcd(24 h/28 d)、fcd(36 h/28 d)分别为50%~55%、64%~70%。24 h和36 h龄期时EPS混凝土的动态抗压强度均超过了28 d龄期时的一半。
冲击荷载和准静态荷载下混凝土内部裂缝的演化方式有所不同。在准静态荷载下,宏观裂缝的萌生来源于过渡区,而后主要沿着骨料和水泥浆体的界面扩展,最终产生一条和多条主裂缝导致混凝土破坏。而冲击荷载下,荷载作用时间很短,混凝土变形的速度非常快,裂缝没有足够的时间沿着最薄弱的界面扩展,而是沿着最短路径扩展。因此,冲击荷载下混凝土内部骨料会发生破坏,且冲击速度越大,混凝土的动态抗压强度越大。随着龄期的增大,混凝土内部结构逐渐密实,水泥浆体的强度增大,水泥浆体与骨料、EPS颗粒的粘结增强。因此随着龄期的增大,EPS混凝土的动态抗压强度不断增大。混凝土发生破坏吸收的能量大小与其内部结构密切相关。混凝土内部结构越密实,破坏时所吸收的能量越多。当冲击速度增加量相同时,龄期越大的混凝土其吸收能量的增加量越大,故其动态抗压强度增加量越大。所以EPS混凝土动态抗压强度对冲击速度的敏感性随龄期的增大而增强。见图6
峰值应变(εp)为EPS混凝土动态应力-应变曲线上峰值应力所对应的应变,表征EPS混凝土失去承载能力时的变形。冲击荷载下EPS混凝土的峰值应变如图7所示。由图可知,不同龄期时EPS混凝土的峰值应变均具有冲击速度效应,即随着冲击速度(V)的增大,EPS混凝土的峰值应变不断增大。冲击速度相同时,随着龄期的增大,EPS混凝土的峰值应变也不断增大。采用函数εp=A2+B2V对数据拟合,拟合结果如式(2)所示,拟合效果良好。拟合直线的斜率B2为峰值应变的冲击速度效应系数。由式(2)可知,随着龄期的增大,EPS混凝土峰值应变的冲击速度效应系数不断增大,峰值应变对冲击速度的敏感性逐渐增强。28 d龄期时,EPS混凝土峰值应变的冲击速度效应系数分别较12 h、24 h、36 h龄期时增大了4.27倍、2.08倍、1.13倍。为了表征EPS混凝土早龄期时峰值应变的发展程度,定义εpt/28 d)为早龄期时聚苯乙烯混凝土的峰值应变与28 d龄期时的比值。EPS混凝土的εpt/28 d)如图8所示。由图可知,随着龄期的增大,EPS混凝土的εpt/28 d)不断增大。EPS混凝土的εp(12 h/28 d)、εp(24 h/28 d)、εp(36 h/28 d)分别为50%~72%、59%~76%、66%~82%。由此可见,EPS混凝土早龄期的峰值应变均超过28 d龄期时的一半。
极限应变(εu)为EPS混凝土动态应力-应变曲线上的最大应变,是分析混凝土动态压缩变形特性的重要参数。冲击荷载下EPS混凝土的极限应变如图9所示。由图可知,龄期相同时,随着冲击速度(V)的增大,EPS混凝土的极限应变不断增大。冲击速度相同时,随着龄期的增大,EPS混凝土的极限应变也不断增大。采用函数εu=A3+B3V对数据拟合,拟合结果如式(3)所示,拟合效果良好。拟合直线的斜率B3为极限应变的冲击速度效应系数。由式(3)可知。随着龄期的增大,EPS混凝土极限应变的冲击速度效应系数不断增大,极限应变对冲击速度的敏感性不断增强。12 h、24 h、36 h龄期时,EPS混凝土极限应变的冲击速度效应系数分别为28 d龄期时的77.50%、88.50%、91.08%。为了表征EPS混凝土早龄期时极限应变的发展程度,定义εut/28 d),其计算方法与εpt/28 d)一致。EPS混凝土的εut/28 d)如图10所示。由图可知,随着龄期的增大,EPS混凝土的εut/28 d)不断增大。EPS混凝土的εu(12 h/28 d)、εu(24 h/28 d)、εu(36 h/28 d)分别为78%~82%、85%~87%、91%~93%。由此可见,EPS混凝土早龄期的极限应变发展程度较高,36 h龄期时的极限应变已接近28 d龄期时的极限应变。
在冲击荷载下,混凝土裂缝沿最短路径扩展[15]。且冲击速度越大,混凝土的裂缝数量越多(如图11所示)。所以随着冲击速度的增大,混凝土的变形不断增大。随着龄期的增大,混凝土内部结构逐渐密实,因而其变形能力和变形性能指标对冲击速度的敏感性逐渐增强。随着龄期的增大,EPS颗粒与水泥浆体的粘结增强,EPS颗粒的“吸能缓冲”作用逐渐发挥[16]。所以EPS混凝土的εpt/28 d)、εut/28 d)随龄期的增大而增大。尤其是对于极限应变,即使EPS混凝土已经破坏,但EPS颗粒未完全破碎,故其作用可继续发挥。因此εut/28 d)均大于78%,甚至εu(36 h/28 d)大于90%。
能耗密度(Edd)指单位体积EPS混凝土吸收能量的大小,由式(4)计算得到,反映了EPS混凝土的吸能特性。
式中:AeCeEe分别表示杆的横截面积、波速和弹性模量;εIεTεR分别表示入射、透射、反射的应变;Vs表示试件的体积。冲击荷载下EPS混凝土的能耗密度如图12所示。由图可知,EPS混凝土的能耗密度具有冲击速度强化效应。且冲击速度(V)相同时,随着龄期的增大,EPS混凝土的能耗密度不断增大。采用函数Edd=A4+B4V对数据拟合,拟合结果如式(5)所示,拟合效果良好。拟合直线的斜率B4为能耗密度的冲击速度效应系数。由式(5)可知,随着龄期的增大,EPS混凝土能耗密度的冲击速度效应系数不断增大,能耗密度对冲击速度的敏感性不断增强。12 h、24 h、36 h龄期时,EPS混凝土能耗密度的冲击速度效应系数分别为28 d龄期时的18.12%、44.27%、79.36%。为了表征EPS混凝土早龄期时能耗密度的发展程度,定义Edd(t/28 d)为早龄期时EPS混凝土的能耗密度与28 d龄期时能耗密度的比值。EPS混凝土的Eddt/28 d)如图13所示。由图可知,随着龄期的增大,EPS混凝土的Eddt/28 d)不断增大。EPS混凝土的Edd(12 h/28 d)、Edd(24 h/28 d)、Edd(36 h/28 d)分别为34%~42%、53%~60%、72%~78%。由此可见,EPS混凝土36 h龄期时的能耗密度发展程度较高。
混凝土的破坏是由于裂缝的产生和扩展导致,而裂缝的扩展需要一定的时间。冲击荷载下无法提供足够的时间进行裂缝扩展,因而裂缝扩展速度加快、数量增多。随着裂缝数量的增多,混凝土吸收的能量就增大。因此EPS混凝土的能耗密度随着冲击速度的增大而增大。EPS颗粒的空腔结构决定了其具有良好的能量吸收特性。当EPS混凝土受到冲击荷载时,EPS颗粒通过空腔结构的变形、坍塌、破裂、胞壁摩擦等各种形式耗散大量能量,从而有效提高EPS混凝土的吸能特性[17]。随着龄期的增大,水泥持续水化,EPS颗粒和水泥浆体的黏结强度增大,EPS颗粒的“吸能缓冲”作用逐渐发挥。因此,随着龄期的增大,EPS混凝土的吸能特性及能耗密度对冲击速度的敏感性逐渐增大。
研究了EPS混凝土的早龄期抗冲击性能,发现了早龄期的EPS混凝土具有良好的变形和吸能特性,研究结论有利于促进EPS混凝土在地下工程支护结构中的应用。主要结论如下:
(1)EPS混凝土的动态抗压强度、峰值应变、极限应变和能耗密度均具有冲击速度强化效应。随着冲击速度的增大,EPS混凝土的动态抗压强度、峰值应变、极限应变和能耗密度均不断增大。
(2)随着龄期的增大,EPS混凝土的动态抗压强度、峰值应变、极限应变和能耗密度均不断增大,动态抗压强度、峰值应变、极限应变和能耗密度对冲击速度的敏感性不断增强。
(3)EPS混凝土早龄期具有良好的变形特性和吸能特性。36 h龄期时,EPS混凝土的峰值应变、极限应变和能耗密度分别可达到28 d龄期时的66%~82%、91%~93%和72%~78%。
  • 山东省自然科学基金面上项目(ZR2021ME004)
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2024年第41卷第3期
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doi: 10.3963/j.issn.1001-487X.2024.03.018
  • 接收时间:2023-07-17
  • 首发时间:2026-03-20
  • 出版时间:2024-09-01
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  • 收稿日期:2023-07-17
基金
Natural science Foundation of Shandong Province(ZR2021ME004)
山东省自然科学基金面上项目(ZR2021ME004)
作者信息
    1.太原城市职业技术学院 城建系,太原 030027
    2.中交第一公路勘察设计研究院有限公司,西安 710075
    3.郑州大学 土木工程学院,郑州 450001
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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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