纖維水泥及制品_2020_《混凝土與水泥制品》雜志社

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纖維水泥及制品

硫酸鹽環境下CFRP加固順序對混凝土梁界面黏結性能影響

王占銀1，傅鳴春2

2020年1期 ? No.285 ? P41-46+58

摘要

引用本文

摘要：提出了先粘貼CFRP后硫酸鹽腐蝕以及先硫酸鹽腐蝕后粘貼CFRP兩種加固順序，開展了64塊CFRP-混凝土試件的雙剪試驗，分析了CFRP粘貼順序、粘貼長度、粘貼寬度對混凝土界面破壞模態、抗壓強度、剝離荷載、黏結強度、界面能、黏結應力-滑移曲線的影響，并基于硫酸鹽環境影響系數建立了CFRP-混凝土界面黏結強度模型。試驗結果表明，硫酸鹽環境下，環氧樹脂膠體能較好的保護混凝土黏結區域；隨著硫酸鹽腐蝕時間的延長，界面的剝離荷載、黏結強度均呈下降趨勢，腐蝕至123 d時，下降最為嚴重，而對于界面斷裂能，腐蝕至123 d時，下降幅度反而降低；CFRP黏結長度為65 mm下的界面黏結強度最大，隨著黏結長度的增加，CFRP-混凝土界面的黏結性能逐漸降低；硫酸鹽環境影響系數的提出可為惡劣環境的分類提供科學依據。
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.

王占銀,傅鳴春.硫酸鹽環境下CFRP加固順序對混凝土梁界面黏結性能影響[J].混凝土與水泥制品,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中玄武巖纖維分散性與彎曲韌性試驗研究

鄧宗才，丁建明

2020年1期 ? No.285 ? P47-50

摘要

引用本文

摘要：提出了一種有助于纖維分散的攪拌工序，給出了一種測量纖維分散性的簡易方法，分析了不同纖維摻量（5kg/m3、10kg/m3、15kg/m3）對玄武巖纖維混凝土（BFRC）的纖維分散性、基本力學性能及彎曲韌性的影響。結果表明，攪拌工序可使纖維在基體中均勻分散，亦可降低纖維在攪拌過程中的損傷；隨纖維摻量的增加，BFRC力學性能先提高后降低，其對BFRC彎曲韌性試驗中的峰值強度、殘余強度及彎曲韌性值的影響規律亦是如此；BFRC的力學性能及彎曲韌性在纖維摻量為10kg/m3時最佳。?Abstract:?Astirringprocesswhichhelpsthefiberdisperseandasimplemeasurementmethodoffiberdispersionwereproposed,andtheinfluenceofdifferentfibercontent(5kg/m3,10kg/m3,15kg/m3)onthefiberdispersibility,basicmechanicalpropertiesandflexuraltoughnessofbasaltfiberreinforcedconcrete(BFRC)wereanalysed.Theresultsshowthatthestirringprocesscanevenlydispersethefibersinthematrix,andreducethedamageofthefibersduringthestirringprocess.Withtheincreaseoffibercontent,themechanicalpropertiesofBFRCincreasefirstandthendecrease,whichistrueforitsinfluenceonthepeakstrength,residualstrengthandflexuraltoughnessvalueinBFRCflexuraltoughnesstest.ThemechanicalpropertiesandflexuraltoughnessofBFRCarebestwhenthefibercontentis10kg/m3.

鄧宗才,丁建明.BFRC中玄武巖纖維分散性與彎曲韌性試驗研究[J].混凝土與水泥制品,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.

納米碳纖維改性混凝土的力學性能及微觀機理

王麗霖1，林雪2,3

2020年1期 ? No.285 ? P51-54

摘要

引用本文

摘要：采用不同摻量的納米碳纖維制備混凝土，測試了納米碳纖維改性混凝土的抗壓強度、抗折強度和劈拉強度，并對其改性機理進行了探究。結果表明，適量的納米碳纖維能夠提高混凝土的力學性能。當摻量為0.3%時，納米碳纖維改性混凝土的力學性能最優，其抗壓強度、抗折強度和劈拉強度相較于素混凝土分別提高了9.2%、13.2%和17.5%。SEM測試結果表明，納米碳纖維能夠在混凝土內部形成立體網狀結構，改善混凝土的微觀形貌特征，增強混凝土的韌性和整體性，填充混凝土內部的孔隙缺陷，細化孔徑分布，消耗混凝土破壞時的部分斷裂破壞能。
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.

王麗霖,林雪.納米碳纖維改性混凝土的力學性能及微觀機理[J].混凝土與水泥制品,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.

多尺寸纖維透水混凝土性能試驗研究

尤志國1,2，王璐1,2，劉佳星1,2

2020年1期 ? No.285 ? P55-58

摘要

引用本文

摘要：采用尺寸分別為6mm、12mm、20mm的玄武巖纖維和聚丙烯纖維對粗骨料粒徑為5～10mm和10～20mm的透水混凝土的透水系數、孔隙率、抗壓強度、抗折強度以及凍融耐久性變化規律進行了分析，并與普通透水混凝土進行了對比。結果表明，纖維的摻入以及纖維尺寸的遞增能夠提升透水混凝土的力學性能和凍融耐久性；透水混凝土的透水性能、力學性能和凍融耐久性均隨著骨料粒徑的增大而增加；玄武巖纖維在增強透水混凝土性能方面優于聚丙烯纖維；尺寸為12mm的玄武巖纖維和粒徑為10～20mm的骨料更適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.

尤志國,王璐,劉佳星.多尺寸纖維透水混凝土性能試驗研究[J].混凝土與水泥制品,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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