纤维水泥及制品_2020_《混凝土与水泥制品》杂志社

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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

硫酸盐环境下CFRP加固顺序对混凝土梁界面黏结性能影响

王占银1，傅鸣春2

2020年1期 No.285 P41-46+58

摘要

引用本文

摘要：提出了先粘贴CFRP后硫酸盐腐蚀以及先硫酸盐腐蚀后粘贴CFRP两种加固顺序，开展了64块CFRP-混凝土试件的双剪试验，分析了CFRP粘贴顺序、粘贴长度、粘贴宽度对混凝土界面破坏模态、抗压强度、剥离荷载、黏结强度、界面能、黏结应力-滑移曲线的影响，并基于硫酸盐环境影响系数建立了CFRP-混凝土界面黏结强度模型。试验结果表明，硫酸盐环境下，环氧树脂胶体能较好的保护混凝土黏结区域；随着硫酸盐腐蚀时间的延长，界面的剥离荷载、黏结强度均呈下降趋势，腐蚀至123 d时，下降最为严重，而对于界面断裂能，腐蚀至123 d时，下降幅度反而降低；CFRP黏结长度为65 mm下的界面黏结强度最大，随着黏结长度的增加，CFRP-混凝土界面的黏结性能逐渐降低；硫酸盐环境影响系数的提出可为恶劣环境的分类提供科学依据。
Abstract: Two kinds of reinforcement sequence, CFRP first, then sulfate corrosion, and sulfate first, then CFRP, were put forward, and the double shear tests of 64 CFRP-concrete specimens were carried out, and the effects of CFRP paste sequence, bond length and width of bond on the failure mode, compressive strength, failure load, bond strength, fracture energy, bond stress- slip curve were analyzed, the bond strength model of CFRP-concrete interface was established based on the environmental impact coefficient of sulfate. The results show that the sulfate environment, epoxide resin can better protect concrete bond area. With the prolongation of sulfate corrosion time, failure load and compressive strength of the interface decrease, and when corrosion time is 123 days, the decline is the most serious, but for the interfacial fracture energy, when corrosion time is 123 days, the decrease range is reduced. Interfacial bond strength is maximum when CFRP bond length is 65 mm, with the bond length increases, the bond performance of interface between CFRP and concrete gradually reduces. The sulfate environment influential coefficient can provide scientific basis for the classification of harsh environment.

王占银,傅鸣春.硫酸盐环境下CFRP加固顺序对混凝土梁界面黏结性能影响[J].混凝土与水泥制品,2020(1):41-46+58.
WANG Z Y,FU M C.Influence of CFRP Paste Sequence Bond Performance of Concrete Beam Interface under Sulfate Environment [J].China Concrete and Cement Products,2020(1):41-46+58.

BFRC中玄武岩纤维分散性与弯曲韧性试验研究

邓宗才，丁建明

2020年1期 No.285 P47-50

摘要

引用本文

摘要：提出了一种有助于纤维分散的搅拌工序，给出了一种测量纤维分散性的简易方法，分析了不同纤维掺量（5kg/m3、10kg/m3、15kg/m3）对玄武岩纤维混凝土（BFRC）的纤维分散性、基本力学性能及弯曲韧性的影响。结果表明，搅拌工序可使纤维在基体中均匀分散，亦可降低纤维在搅拌过程中的损伤；随纤维掺量的增加，BFRC力学性能先提高后降低，其对BFRC弯曲韧性试验中的峰值强度、残余强度及弯曲韧性值的影响规律亦是如此；BFRC的力学性能及弯曲韧性在纤维掺量为10kg/m3时最佳。 Abstract: Astirringprocesswhichhelpsthefiberdisperseandasimplemeasurementmethodoffiberdispersionwereproposed,andtheinfluenceofdifferentfibercontent(5kg/m3,10kg/m3,15kg/m3)onthefiberdispersibility,basicmechanicalpropertiesandflexuraltoughnessofbasaltfiberreinforcedconcrete(BFRC)wereanalysed.Theresultsshowthatthestirringprocesscanevenlydispersethefibersinthematrix,andreducethedamageofthefibersduringthestirringprocess.Withtheincreaseoffibercontent,themechanicalpropertiesofBFRCincreasefirstandthendecrease,whichistrueforitsinfluenceonthepeakstrength,residualstrengthandflexuraltoughnessvalueinBFRCflexuraltoughnesstest.ThemechanicalpropertiesandflexuraltoughnessofBFRCarebestwhenthefibercontentis10kg/m3.

邓宗才,丁建明.BFRC中玄武岩纤维分散性与弯曲韧性试验研究[J].混凝土与水泥制品,2020(1):47-50.
DENG Z C,DING J M.Experimental Study on the Dispersibility and Flexural Toughness of Basalt Fibers in BFRC [J].China Concrete and Cement Products,2020(1):47-50.

纳米碳纤维改性混凝土的力学性能及微观机理

王丽霖1，林雪2,3

2020年1期 No.285 P51-54

摘要

引用本文

摘要：采用不同掺量的纳米碳纤维制备混凝土，测试了纳米碳纤维改性混凝土的抗压强度、抗折强度和劈拉强度，并对其改性机理进行了探究。结果表明，适量的纳米碳纤维能够提高混凝土的力学性能。当掺量为0.3%时，纳米碳纤维改性混凝土的力学性能最优，其抗压强度、抗折强度和劈拉强度相较于素混凝土分别提高了9.2%、13.2%和17.5%。SEM测试结果表明，纳米碳纤维能够在混凝土内部形成立体网状结构，改善混凝土的微观形貌特征，增强混凝土的韧性和整体性，填充混凝土内部的孔隙缺陷，细化孔径分布，消耗混凝土破坏时的部分断裂破坏能。
Abstract: Carbon nanofibers modified concrete was prepared with different dosage of carbon nanofibers. The compressive strength, flexural strength and splitting strength of the concrete were tested, and the modification mechanism was explored. The results show that the appropriate amount of carbon nanofibers can improve the mechanical properties of concrete. When the content of carbon nanofibers is 0.3%, the carbon nanofibers modified concrete has the best mechanical properties, among which the compressive strength, flexural strength and splitting strength are increased by 9.2%, 13.2% and 17.5% respectively compared with those of plain concrete. The SEM results show that carbon nanofibers can form a three-dimensional network structure inside concrete, thereby improving the micro-morphology of concrete, enhancing the toughness and integrity of concrete, filling the internal pore defects inside concrete, refining the pore diameter distribution, and consuming part of the fracture energy of concrete when it is destroyed.

王丽霖,林雪.纳米碳纤维改性混凝土的力学性能及微观机理[J].混凝土与水泥制品,2020(1):51-54.
WANG L L, LIN X.Mechanical Properties and Micromechanism of Concrete Modified by Carbon Nanofibers [J].China Concrete and Cement Products,2020(1):51-54.

多尺寸纤维透水混凝土性能试验研究

尤志国1,2，王璐1,2，刘佳星1,2

2020年1期 No.285 P55-58

摘要

引用本文

摘要：采用尺寸分别为6mm、12mm、20mm的玄武岩纤维和聚丙烯纤维对粗骨料粒径为5～10mm和10～20mm的透水混凝土的透水系数、孔隙率、抗压强度、抗折强度以及冻融耐久性变化规律进行了分析，并与普通透水混凝土进行了对比。结果表明，纤维的掺入以及纤维尺寸的递增能够提升透水混凝土的力学性能和冻融耐久性；透水混凝土的透水性能、力学性能和冻融耐久性均随着骨料粒径的增大而增加；玄武岩纤维在增强透水混凝土性能方面优于聚丙烯纤维；尺寸为12mm的玄武岩纤维和粒径为10～20mm的骨料更适用于改善透水混凝土的性能。 Abstract: Basaltfiberandpolypropylenefiberwithdimensionsof6mm,12mmand20mmwereusedtoanalyzethepermeabilitycoefficient,porosity,compressivestrength,bendingstrengthandfreeze-thawdurabilityofperviousconcretewithcoarseaggregatesizeof5～10mmand10～20mm,andcomparedwithordinaryperviousconcrete.Theresultsshowthattheadditionoffibersandtheincreaseoffibersizecanimprovethemechanicalpropertiesandfreeze-thawdurabilityofperviousconcrete.Withtheincreaseofaggregatesize,thewaterpermeability,mechanicalpropertiesandfreeze-thawdurabilityoftheconcreteareincreased.Basaltfiberissuperiortopolypropylenefiberinenhancingtheperformanceofperviousconcrete.Basaltfiberwiththesizeof12mmandcoarseaggregatewithparticlesizeof10～20mmaremoresuitableforimprovingtheperformanceofperviousconcrete.

尤志国,王璐,刘佳星.多尺寸纤维透水混凝土性能试验研究[J].混凝土与水泥制品,2020(1):55-58.
YOU Z G,WANG L,LIU J X.Experimental Study on the Performance of Multi Size Fiber Permeable Concrete [J].China Concrete and Cement Products,2020(1):55-58.

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