苏州混凝土水泥制品研究院有限公司

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发布时间:2020-01-06 00:00:00
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纤 维 水 泥 及 制 品

海水海砂钢纤维混凝土的基本力学性能
海水海砂钢纤维混凝土的基本力学性能
  • 苏红艳1,宋平新2
2020年3期
摘要
引用本文
摘  要:制备了强度等级为C30、C50和C70的海水海砂钢纤维混凝土试件,通过180个标准立方体和72个棱柱体试件,完成了工作性、立方体抗压强度、轴心抗压强度、劈裂抗拉强度以及弹性模量试验,得到了基于两种规范模式下海水海砂钢纤维混凝土的弹性模量与立方体抗压强度的关系公式。结果表明,海水海砂能够配置成工作性良好的高强混凝土,钢纤维有利于提升混凝土拌合物的流动性。对于混凝土抗压强度、轴心抗压强度、劈裂抗拉强度和弹性模量四个指标,海水海砂混凝土均略低于普通混凝土,且随着混凝土强度等级的提高,差距逐渐减小,此外,随着钢纤维体积掺量的增加,上述指标值均逐渐增大。海水海砂混凝土的弹性模量与抗压强度关系模型与试验数据吻合较好,且具有一定安全储备,可供沿海、海岛土木加固工程借鉴。 Abstract:Theseawatersea-sandsteelfiberconcretespecimenswithexpectedstrengthofC30,C50andC70wereprepared,andthetestsofworkingperformance,cubiccompressivestrength,axialcompressivestrength,splittingtensilestrengthandelasticmoduluswerecompletedthrough180piecesofstandardcubesand72prismspecimens,andtherelationshipbetweenelasticmodulusandcubecompressivestrengthofseawatersea-sandsteelfiberconcretebasedontwostandardmodeswasobtained.Theresultsshowthatseawatersea-sandcanbeconfiguredintohigh-strengthconcretewithgoodworkability,andthesteelfiberisbeneficialtoimprovethefluidityofconcretemixture.Thefourindexesofconcretecompressivestrength,axialcompressivestrength,splittingtensilestrengthandelasticmodulusofseawatersea-sandconcreteisslightlylowerthanthoseofordinaryconcrete,andthegapgraduallydecreaseswiththeincreaseofconcretestrengthgrade,andwiththeincreaseofthevolumefractionofsteelfiber,theaboveindexvaluesgraduallyincrease.Themodeloftherelationshipbetweentheelasticmodulusandcompressivestrengthofseawaterconcretehasahighdegreeofagreementwiththeexperimentaldata,andhasacertainsafetyreserve,whichcanbeusedforreferencetothecoastalislandcivilengineeringreinforcementproject.
苏红艳,宋平新.海水海砂钢纤维混凝土的基本力学性能[J].混凝土与水泥制品,2020(3):55-59.
SU H Y,SONG P X.Basic Mechanical Properties of Seawater Sea-sand Steel Fiber Concrete[J].China Concrete and Cement Products,2020(3):55-59.
聚丙烯纤维改善透水混凝土抗拉性能机理研究
聚丙烯纤维改善透水混凝土抗拉性能机理研究
  • 林海威1,谢建斌2,吕 龙2,郝志云1
2020年3期
摘要
引用本文
摘  要:采用体积掺量分别为0.1%、0.2%、0.3%、0.4%、0.5%的聚丙烯束状纤维和0.5%、1.0%、1.5%的聚丙烯塑钢纤维制备的透水混凝土,以孔隙率、透水系数、抗拉强度和临界体积率为评价指标,结合扫描电镜(SEM)法,探究了聚丙烯纤维类型对透水混凝土抗拉性能的改善作用。结果表明,透水混凝土的孔隙率和透水系数随纤维掺量的增加而减小;当聚丙烯束状纤维掺量超过0.3%时,纤维极易发生缠绕和成团现象,而三种掺量下的聚丙烯塑钢纤维仍能较好地分散于骨料间;聚丙烯塑钢纤维对透水混凝土抗拉强度的提升效果优于聚丙烯束状纤维。 Abstract: Thepermeableconcretewaspreparedbyusingpolypropylenebundlefiberwithvolumefractionof0.1%,0.2%,0.3%,0.4%,0.5%andpolypropyleneplasticsteelfiberof0.5%,1.0%and1.5%,respectively,andbasedontheevaluationindexesofporosity,waterpermeabilitycoefficient,tensilestrengthandcriticalvolumeratio,combinedwithscanningelectronmicroscopy(SEM),themodificationeffectofpolypropylenefibertypeonthetensilepropertiesofpermeableconcretewasinvestigated.Theresultsshowthattheporosityandwaterpermeabilitycoefficientofthepermeableconcretedecreasewiththeincreaseofthefibercontent,andthepolypropyleneplasticsteelfiberismorefavorableforthedecreaseofporosityandpermeabilitycoefficient;Whenthecontentofpolypropylenebundlefiberexceeds0.3%,thefiberiseasytointertwineandclustering,whilethepolypropyleneplasticsteelfiberofthethreedosagescanstillbewelldispersedbetweentheaggregates;Theeffectofpolypropyleneplasticsteelfiberonthetensilestrengthofpermeableconcreteisbetterthanthatofpolypropylenebundlefiber.
林海威,谢建斌,吕龙,等.聚丙烯纤维改善透水混凝土抗拉性能机理研究[J].混凝土与水泥制品,2020(3):50-54.
LIN H W,XIE J B,LYU L,et al.Study on the Tensile Performance Mechanism of Permeable Concrete Modified by Polypropylene Fiber[J].China Concrete and Cement Products,2020(3):50-54.
不同短切纤维对珊瑚混凝土力学性能的影响
不同短切纤维对珊瑚混凝土力学性能的影响
  • 吴 庆,史文浩,邹 彦,许 耀,游艺林,王 刚,王石林,李薛忠
2020年3期
摘要
引用本文
摘  要:研究了不同短切纤维(改性聚丙烯纤维MPPF、仿钢纤维ISF、玄武岩纤维BF)及掺量对珊瑚混凝土力学性能的影响,并对其破坏形态进行了分析。结果表明,纤维珊瑚混凝土早期抗压强度增长速率快而后期强度增长速率缓慢;当珊瑚混凝土中分别掺入1kg/m3、2kg/m3和3kg/m3的MPPF与ISF时,珊瑚混凝土的抗压强度、劈裂抗拉强度与抗折强度较空白组均有所增加;相比于ISF,MPPF对珊瑚混凝土力学性能的改善效果更为显著,且最佳MPPF掺量为2kg/m3;当珊瑚混凝土中掺入BF时,珊瑚混凝土的力学性能有所降低;掺加纤维可以改善混凝土的脆性,使其破坏时表现出良好的延性。 Abstract: Theinfluenceofthecontentofdifferentshortcutfibers(MPPF,ISF,BF)onthemechanicalpropertiesofcoralconcreteswerestudied,andcombinedwithitsfailurepatternwasanalyzed.Theresultsshowthatthecompressivestrengthgrowthrateoffibercoralconcreteisfastintheearlystageandslowinthelaterstage.WhencoralconcreteisblendedwithMPPFandISFof1kg/m3,2kg/m3,and3kg/m3,respectively,thecompressivestrength,splittingtensilestrengthandflexuralstrengthofcoralconcreteareincreasedcomparedwiththoseofblankgroup.ComparedwithISF,MPPFcanimprovethemechanicalpropertiesofcoralconcretemoresignificantlyandtheoptimalMPPFcontentis2kg/m3.WhenBFisaddedintocoralconcrete,themechanicalpropertiesofcoralconcretearereduced.Addingfibercanimprovethebrittlenessofconcreteandmakeitshowgoodductilitywhenitisbroken.
吴庆,史文浩,邹彦,等.不同短切纤维对珊瑚混凝土力学性能的影响[J].混凝土与水泥制品,2020(3):46-49.
WU Q,SHI W H,ZOU Y,et al.Effect of Different Chopped Fibers on Mechanical Properties of Coral Concrete[J].China Concrete and Cement Products,2020(3):46-49.
纳米 CaCO<sub>3</sub>和PVA纤维增强混凝土工作性及力学性能的研究
纳米 CaCO3和PVA纤维增强混凝土工作性及力学性能的研究
  • 张 鹏,王 磊,王 娟,焦美菊
2020年3期
摘要
引用本文
摘要:基于坍落度、坍落扩展度、抗压强度和抗压弹性模量试验,研究了体积掺量分别为0.05%、0.1%、0.15%、0.2%的PVA纤维和质量掺量分别为1%、2%、3%、4%的纳米CaCO3颗粒对掺粉煤灰混凝土工作性和力学性能的影响。结果表明,在一定的掺量范围内,随着纳米CaCO3掺量的增加,混凝土的抗压强度和抗压弹性模量先增大后减小,当纳米CaCO3掺量为3% 时,抗压强度和抗压弹性模量达到最大值;随着PVA纤维体积掺量的增加,混凝土抗压强度先增大后减小,而抗压弹性模量整体上呈逐渐减小的趋势,当纤维体积掺量为0.15%和0.05%时,抗压强度和抗压弹性模量分别达到最大值;新拌混凝土的工作性随着纳米CaCO3和PVA纤维掺量的增加而逐渐降低。
Abstract:The slump, slump spread, compressive strength and compressive elastic modulus tests were carried out, and the effects of PVA fiber with volume content of 0.05%, 0.1%, 0.15%, and 0.2% and nano-CaCO3 particles with mass content of 1%, 2%, 3%, and 4% on the workability and mechanical properties of fly ash concrete were studied. The results show that the compressive strength and compressive elastic modulus of concrete increase first and then decrease with the increase of nano-CaCO3 content within a certain range, and when the nano-CaCO3 content is 3%, the compressive strength and compressive elastic modulus can reach the maximum. The compressive strength increases first and then decreases with the increase of PVA fiber content, while the compressive elastic modulus decreases gradually as a whole, and when the content of PVA fiber are 0.15% and 0.05%, the compressive strength and compressive elastic modulus reach the maximum. The workability of fresh concrete gradually decreases with the increase of nano-CaCO3 and PVA fiber content.
张鹏,王磊,王娟,等.纳米CaCO3和PVA纤维增强混凝土工作性及力学性能的研究[J].混凝土与水泥制品,2020(3):42-45,54. ZHANG P,WANG L,WANG J,et al.Study on the Workability and Mechanical Properties of Nano-CaCO3 and PVA Fiber Reinforced Concrete[J].China Concrete and Cement Products,2020(3):42-45,54.
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