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    蘇州混凝土水泥制品研究院有限公司

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    纖 維 水 泥 及 制 品

    納米 CaCO<sub>3</sub>和PVA纖維增強混凝土工作性及力學性能的研究
    納米 CaCO3和PVA纖維增強混凝土工作性及力學性能的研究
    • 張 鵬,王 磊,王 娟,焦美菊
    2020年3期
    摘要
    引用本文
    摘要:基于坍落度、坍落擴展度、抗壓強度和抗壓彈性模量試驗,研究了體積摻量分別為0.05%、0.1%、0.15%、0.2%的PVA纖維和質量摻量分別為1%、2%、3%、4%的納米CaCO3顆粒對摻粉煤灰混凝土工作性和力學性能的影響。結果表明,在一定的摻量范圍內,隨著納米CaCO3摻量的增加,混凝土的抗壓強度和抗壓彈性模量先增大后減小,當納米CaCO3摻量為3% 時,抗壓強度和抗壓彈性模量達到最大值;隨著PVA纖維體積摻量的增加,混凝土抗壓強度先增大后減小,而抗壓彈性模量整體上呈逐漸減小的趨勢,當纖維體積摻量為0.15%和0.05%時,抗壓強度和抗壓彈性模量分別達到最大值;新拌混凝土的工作性隨著納米CaCO3和PVA纖維摻量的增加而逐漸降低。
    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.
    張鵬,王磊,王娟,等.納米CaCO3和PVA纖維增強混凝土工作性及力學性能的研究[J].混凝土與水泥制品,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.
    不同短切纖維對珊瑚混凝土力學性能的影響
    不同短切纖維對珊瑚混凝土力學性能的影響
    • 吳 慶,史文浩,鄒 彥,許 耀,游藝林,王 剛,王石林,李薛忠
    2020年3期
    摘要
    引用本文
    摘??要:研究了不同短切纖維(改性聚丙烯纖維MPPF、仿鋼纖維ISF、玄武巖纖維BF)及摻量對珊瑚混凝土力學性能的影響,并對其破壞形態進行了分析。結果表明,纖維珊瑚混凝土早期抗壓強度增長速率快而后期強度增長速率緩慢;當珊瑚混凝土中分別摻入1kg/m3、2kg/m3和3kg/m3的MPPF與ISF時,珊瑚混凝土的抗壓強度、劈裂抗拉強度與抗折強度較空白組均有所增加;相比于ISF,MPPF對珊瑚混凝土力學性能的改善效果更為顯著,且最佳MPPF摻量為2kg/m3;當珊瑚混凝土中摻入BF時,珊瑚混凝土的力學性能有所降低;摻加纖維可以改善混凝土的脆性,使其破壞時表現出良好的延性。?Abstract:?Theinfluenceofthecontentofdifferentshortcutfibers(MPPF,ISF,BF)onthemechanicalpropertiesofcoralconcreteswerestudied,andcombinedwithitsfailurepatternwasanalyzed.Theresultsshowthatthecompressivestrengthgrowthrateoffibercoralconcreteisfastintheearlystageandslowinthelaterstage.WhencoralconcreteisblendedwithMPPFandISFof1kg/m3,2kg/m3,and3kg/m3,respectively,thecompressivestrength,splittingtensilestrengthandflexuralstrengthofcoralconcreteareincreasedcomparedwiththoseofblankgroup.ComparedwithISF,MPPFcanimprovethemechanicalpropertiesofcoralconcretemoresignificantlyandtheoptimalMPPFcontentis2kg/m3.WhenBFisaddedintocoralconcrete,themechanicalpropertiesofcoralconcretearereduced.Addingfibercanimprovethebrittlenessofconcreteandmakeitshowgoodductilitywhenitisbroken.
    吳慶,史文浩,鄒彥,等.不同短切纖維對珊瑚混凝土力學性能的影響[J].混凝土與水泥制品,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.
    聚丙烯纖維改善透水混凝土抗拉性能機理研究
    聚丙烯纖維改善透水混凝土抗拉性能機理研究
    • 林海威1,謝建斌2,呂 龍2,郝志云1
    2020年3期
    摘要
    引用本文
    摘??要:采用體積摻量分別為0.1%、0.2%、0.3%、0.4%、0.5%的聚丙烯束狀纖維和0.5%、1.0%、1.5%的聚丙烯塑鋼纖維制備的透水混凝土,以孔隙率、透水系數、抗拉強度和臨界體積率為評價指標,結合掃描電鏡(SEM)法,探究了聚丙烯纖維類型對透水混凝土抗拉性能的改善作用。結果表明,透水混凝土的孔隙率和透水系數隨纖維摻量的增加而減??;當聚丙烯束狀纖維摻量超過0.3%時,纖維極易發生纏繞和成團現象,而三種摻量下的聚丙烯塑鋼纖維仍能較好地分散于骨料間;聚丙烯塑鋼纖維對透水混凝土抗拉強度的提升效果優于聚丙烯束狀纖維。?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,謝建斌,呂龍,等.聚丙烯纖維改善透水混凝土抗拉性能機理研究[J].混凝土與水泥制品,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.
    海水海砂鋼纖維混凝土的基本力學性能
    海水海砂鋼纖維混凝土的基本力學性能
    • 蘇紅艷1,宋平新2
    2020年3期
    摘要
    引用本文
    摘??要:制備了強度等級為C30、C50和C70的海水海砂鋼纖維混凝土試件,通過180個標準立方體和72個棱柱體試件,完成了工作性、立方體抗壓強度、軸心抗壓強度、劈裂抗拉強度以及彈性模量試驗,得到了基于兩種規范模式下海水海砂鋼纖維混凝土的彈性模量與立方體抗壓強度的關系公式。結果表明,海水海砂能夠配置成工作性良好的高強混凝土,鋼纖維有利于提升混凝土拌合物的流動性。對于混凝土抗壓強度、軸心抗壓強度、劈裂抗拉強度和彈性模量四個指標,海水海砂混凝土均略低于普通混凝土,且隨著混凝土強度等級的提高,差距逐漸減小,此外,隨著鋼纖維體積摻量的增加,上述指標值均逐漸增大。海水海砂混凝土的彈性模量與抗壓強度關系模型與試驗數據吻合較好,且具有一定安全儲備,可供沿海、海島土木加固工程借鑒。?Abstract:Theseawatersea-sandsteelfiberconcretespecimenswithexpectedstrengthofC30,C50andC70wereprepared,andthetestsofworkingperformance,cubiccompressivestrength,axialcompressivestrength,splittingtensilestrengthandelasticmoduluswerecompletedthrough180piecesofstandardcubesand72prismspecimens,andtherelationshipbetweenelasticmodulusandcubecompressivestrengthofseawatersea-sandsteelfiberconcretebasedontwostandardmodeswasobtained.Theresultsshowthatseawatersea-sandcanbeconfiguredintohigh-strengthconcretewithgoodworkability,andthesteelfiberisbeneficialtoimprovethefluidityofconcretemixture.Thefourindexesofconcretecompressivestrength,axialcompressivestrength,splittingtensilestrengthandelasticmodulusofseawatersea-sandconcreteisslightlylowerthanthoseofordinaryconcrete,andthegapgraduallydecreaseswiththeincreaseofconcretestrengthgrade,andwiththeincreaseofthevolumefractionofsteelfiber,theaboveindexvaluesgraduallyincrease.Themodeloftherelationshipbetweentheelasticmodulusandcompressivestrengthofseawaterconcretehasahighdegreeofagreementwiththeexperimentaldata,andhasacertainsafetyreserve,whichcanbeusedforreferencetothecoastalislandcivilengineeringreinforcementproject.
    蘇紅艷,宋平新.海水海砂鋼纖維混凝土的基本力學性能[J].混凝土與水泥制品,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.
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