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    蘇州混凝土水泥制品研究院有限公司

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    混 凝 土 研 究

    超高強水泥基復合材料力學及收縮性能研究
    超高強水泥基復合材料力學及收縮性能研究
    • 秦永鑒1,黃凱健1,王元綱1,王愛國2,吳建生3
    2020年3期 ? No.287 ? P1-5
    摘要
    引用本文
    摘??要:選取鋼纖維和玄武巖纖維進行試驗,研究了兩種纖維摻量以及硅灰摻量對超高強水泥基復合材料抗壓抗折強度、疲勞性能以及體積收縮率的影響。結果表明,纖維和硅灰的加入能有效改善水泥基材料的力學及收縮性能,鋼纖維對水泥基材料強度提升較大,但玄武巖纖維表現出與材料更好的相容性,1.5%鋼纖維、0.1%玄武巖纖維改善效果最明顯,抗折、抗壓強度分別提高了12.6%、3.0%和21.2%、2.7%,體積收縮率降低了12.2%、5.4%,且1.5%鋼纖維的疲勞壽命是不摻纖維的近4倍,最大跨中撓度曲線呈現明顯的階段性特征;8%硅灰改善效果最大,抗折、抗壓強度分別提高了13.3%、10.4%,體積收縮率降低了28.8%。?Abstract:?Steelfiberandbasaltfiberwereselectedforexperiment,andtheeffectsoftheamountoftwofibers,theamountofsilicafumeonthecompressiveandflexuralstrengthandvolumeshrinkageofultra-highstrengthcementitiouscompositeswereexplored.Theresultsshowthattheadditionoffiberandsilicafumecaneffectivelyimprovethemechanicalandshrinkagepropertiesofcementitiouscomposites.Steelfiberhasgreatimprovementinstrengthforcementitiouscomposites,butbasaltfiberexhibitsbettercompatibilitywithmaterials.1.5%steelfiberor0.1%basaltfiberhasthegreatestimprovementforthecementitiousproperty,andtheflexuralandcompressivestrengthsareincreasedrespectivelyby12.6%,3.0%and21.2%,2.7%,respectively.Thevolumeshrinkagerateisreducedrespectivelyby12.2%and5.4%.Thefatiguelifeofthespecimenswith1.5%steelfiberisnearly4timesthatofthespecimenwithoutfiber,andthemaximummid-spandeflectioncurveshowsobviouslycharacteristicsofstages.8%silicaashhasthegreatestimprovementeffect.Theflexuralandcompressivestrengthincreasedrespectivelyby13.3%and10.4%,andthevolumeshrinkagerateisdecreasedby28.8%.
    秦永鑒,黃凱健,王元綱,等.超高強水泥基復合材料力學及收縮性能研究[J].混凝土與水泥制品,2020(3):1-5.
    QIN Y J,HUANG K J,WANG Y G,et al.Mechanical and Shrinkage Properties of Ultra-high Strength Cement Composites[J].China Concrete and Cement Products,2020(3):1-5.
    石粉含量對超高性能混凝土性能影響研究
    石粉含量對超高性能混凝土性能影響研究
    • 趙學濤1,楊鼎宜1,2;杜保聰1,朱從香3,楊 俊1,劉 淼1
    2020年3期 ? No.287 ? P6-9
    摘要
    引用本文
    摘??要:研究了不同石粉含量對超高性能混凝土工作性、力學性能以及抗凍性能的影響。結果表明,隨著石粉含量的增加,超高性能混凝土的流動性、抗壓、抗折強度均呈現出先上升后下降的趨勢;石粉含量對超聲波速和動彈性模量變化趨勢與強度變化趨勢一致;隨著石粉含量的增加,抗凍性能先增加后減??;UHPC的最優石粉含量為3%~5%。?Abstract:?Theinfluenceofdifferentstonepowdercontentontheworkingperformance,mechanicalpropertiesandfrostresistanceofUHPCwasstudied.Theresultsshowthatwiththeincreaseofstonepowdercontent,thefluidity,compressivestrengthandflexuralstrengthofUHPCallshowatrendoffirstrisingandthenfalling;thechangetrendofstonepowdercontenttoultrasonicvelocityanddynamicelasticmodulusisconsistentwiththechangetrendofstrength;withtheincreaseofstonepowdercontent,thefrostresistancefirstincreasesandthendecreases;theoptimalcontentofUHPCstonepowderis3%~5%.
    趙學濤,楊鼎宜,杜保聰,等.石粉含量對超高性能混凝土性能影響研究[J].混凝土與水泥制品,2020(3):6-9.
    ZHAO X T,YANG D Y,DU B C,et al.Study on the Effect of Stone Powder Content on Performance of Ultra-high Performance Concrete(UHPC)[J].China Concrete and Cement Products,2020(3):6-9.
    提升水泥砂漿耐酸性能的防護技術研究
    提升水泥砂漿耐酸性能的防護技術研究
    • 錢文勛1,2;賀傳卿3,何 旸1,2; 韋 華1,2
    2020年3期 ? No.287 ? P10-14
    摘要
    引用本文
    摘要:采用普通硅酸鹽水泥、磨細礦渣和粉煤灰等原材料配制了水膠比和礦物摻合料摻量不同的4種砂漿試件,并使用環氧防護涂層對其中1種砂漿進行表面防腐涂刷。將成型的砂漿試件分別浸泡于不同pH值的硫酸溶液中。對比研究了各齡期砂漿的質量變化率和強度變化率以及不同砂漿在侵蝕試驗后的表面微觀形貌。結果表明,硫酸溶液對水泥砂漿有嚴重的腐蝕作用,在pH值較低的強酸溶液中,通過降低水膠比的方式并不能顯著提升砂漿的抗酸侵蝕能力;含大摻量礦物摻合料的砂漿,其耐酸腐蝕性能有明顯提升;pH≥3的中強酸和弱酸環境對水泥基材料的侵蝕作用會有明顯減弱;采用環氧涂層可較大幅度提升水泥砂漿的耐酸腐蝕性。
    Abstract:Based on the internal and external protection of hydraulic concrete - large amount of mineral admixture strategy and coating protection skills, the research and evaluation of different protections on the improvement of acid corrosion resistance were carried out to provide a support for acid corrosion resistance of relevant hydraulic structures. Four kinds of cement mortar with different W/C and mineral content were made by cement, slag and fly ash. The epoxy protective coating was used on one kind of the mortar, and the mortar specimens were soaked in sulfuric acid solution of different pH values. The quality change rate and intensity change rate of mortar at different ages and the microcosmic appearances of the surface sampled from different mortars after the erosion tests were compared and analyzed. The results show that sulfuric acid solution makes serious corrosive effect on cement mortar, and the ways to reduce the W/C can not significantly enhance the ability to resist acid attack for cementitious materials. The corrosion resistance of mortar can be obviously improved with large amount of mineral admixture and the erosion effect on cementitious materials can be significantly reduced while soaking in the medium-strong or weak acid environment. The epoxy resin can greatly improve the acid corrosion resistance of mortar.
    錢文勛,賀傳卿,何旸,等.提升水泥砂漿耐酸性能的防護技術研究[J].混凝土與水泥制品,2020(3):10-14.
    QIAN W X,HE C Q,HE Y,et al.The Protection Technology for Improving Acid Resistance of Cement Mortar[J].China Concrete and Cement Products,2020(3):10-14.
    高溫入模條件下側墻結構混凝土早期收縮裂縫控制技術研究
    高溫入模條件下側墻結構混凝土早期收縮裂縫控制技術研究
    • 張 勇1,李 明1,劉永勝2,徐 文3,田 倩1
    2020年3期 ? No.287 ? P15-18+23
    摘要
    引用本文
    摘??要:溫度收縮和自收縮是導致側墻結構混凝土在約束條件下早期收縮開裂的主要原因,考慮夏季施工混凝土高溫入模時會極大提高側墻開裂風險的現狀,評估了入溫度為35℃時功能材料對混凝土溫度與變形的影響。結果表明,通過摻加具有溫升抑制及微膨脹效果的功能材料可顯著降低混凝土早期絕熱溫升發展速率來降低實體結構溫峰,同時能夠在溫升和溫降階段發揮全過程補償收縮作用,從驅動力層面上降低了側墻結構混凝土早期收縮開裂風險。?Abstract:?Temperatureshrinkageandautogenousshrinkagearethekeyfactorsthatleadtoearlyagecrackingofsidewallconcrete,andthecrackingriskwillberemarkablyincreasedwiththeincreasingofmoldtemperatureinsummerconstruction.Giventhis,theeffectoffunctionalmaterialsontemperatureanddeformationofconcretewiththemoldtemperatureof35°Cwasinvestigated.Resultsindicatethatbyusingatemperatureriseinhibitedandslightexpansionmixture,theearlyagerateofadiabatictemperaturerisecanbedecreasedsoastorealizeareductionofpeaktemperatureinentitystructure,meanwhile,shrinkagedeformationbothintemperatureriseanddropstagecanbecompensated.Inthiscase,theearlyageshrinkagecrackingriskofsidewallconcretecanbeeffectivelyreducedfromtheperspectiveofessentialdrivingforce.
    張勇,李明,劉永勝,等.高溫入模條件下側墻結構混凝土早期收縮裂縫控制技術研究[J].混凝土與水泥制品,2020(3):15-18+23.
    ZHANG Y,LI M,LIU Y S,et al.Study on Shrinkage Cracking Control of Sidewall Concrete under High Mold Temperature at Early Age[J].China Concrete and Cement Products,2020(3):15-18+23.
    HCSA膨脹劑摻量對水泥砂漿性能的影響研究
    HCSA膨脹劑摻量對水泥砂漿性能的影響研究
    • 楊 寧1,2 ;韓圣銘2
    2020年3期 ? No.287 ? P19-23
    摘要
    引用本文
    摘??要:為探究HCSA膨脹劑摻量對水泥砂漿的影響,試驗設計制作了6種HCSA膨脹劑摻量的水泥砂漿試塊。對水泥砂漿的工作性、力學性能和收縮性能進行了測試,并通過掃描電子顯微鏡(SEM)觀察其微觀結構。研究結果表明:摻入膨脹劑能夠減少水泥砂漿的初凝時間和流動度;摻入8%~10%的膨脹劑可以有效補償水泥砂漿的自收縮;隨膨脹劑摻量的增加,其抗壓強度和抗折強度均呈先增加后減小的趨勢;SEM結果表明,摻量4%的HCSA膨脹劑可以使水泥砂漿的微觀結構得到優化。?Abstract:?InordertoexploretheinfluenceofHCSAexpansionagentcontentoncementmortarperformance,sixkindsofcementmortartestblockswithHCSAexpansionagentweredesignedandmade.Theworkability,mechanicalpropertiesandshrinkagepropertiesofcementmortarweretested,anditsmicrostructurewasobservedbySEM.Theresultsshowthataddingexpansionagentcanshortentheinitialsettingtimeandfluidityofcementmortar.Inaddition,theadditionof8%~10%expansionagentcaneffectivelycompensatetheself-shrinkageofcementmortar.Thecompressivestrengthandbendingstrengthofcementmortarincreasefirstandthendecreasewiththeincreaseofexpansionagent.HCSAexpansionagentwithacontentofabout4%canoptimizethemicrostructureofcementmortar.
    楊寧,韓圣銘.HCSA膨脹劑摻量對水泥砂漿性能的影響研究[J].混凝土與水泥制品,2020(3):19-23.
    YANG N,HAN S M.Study on the Influence of the Dosage of HCSA Expansion Agent on Cement Mortar Performance[J].China Concrete and Cement Products,2020(3):19-23.
    基于犧牲陽極法的LiBr改性砂漿性能研究
    基于犧牲陽極法的LiBr改性砂漿性能研究
    • 張東方1,2,3;方 翔1,2;范志宏1,2;陳 龍1,2;王 毅3
    2020年3期 ? No.287 ? P24-26+30
    摘要
    引用本文
    摘要:通過摻入LiBr制備了高活性導電砂漿,研究了LiBr摻量與砂漿電阻率及陽極活性之間的關系。結果表明:LiBr能顯著降低砂漿的電阻率,并隨摻量增加電阻率降低。當摻量為160 g時,砂漿的電阻率小于100 Ω·cm。LiBr的摻入能夠活化陽極及促進溶解產物擴散,使陽極具備可持續發出保護電流的能力。
    Abstract:High active conductive mortar was prepared by adding LiBr, and the relationship between the content of lithium bromide and the resistivity of mortar and anodic activity was systematically studied. The results show that the resistivity decreases with increasing the content of lithium bromide, and the resistivity is less than 100 Ω·cm when the content is 160 g. Moreover, the addition of lithium bromide helps to activate the anode and promote the diffusion of dissolved products, thus enable anode to generate a continuous protective current.
    張東方,方翔,范志宏,等.基于犧牲陽極法的LiBr改性砂漿性能研究[J].混凝土與水泥制品,2020(3):24-26+30.
    ZHANG D F,FANG X,FAN Z H,et al.Study on the Performance of LiBr Modified Mortar Based on Sacrificial Anode Method[J].China Concrete and Cement Products,2020(3):24-26+30.
    再生微粉混凝土抗凍性及抗硫酸鹽侵蝕性能研究
    再生微粉混凝土抗凍性及抗硫酸鹽侵蝕性能研究
    • 張 平,古龍龍,李 凱,王子萌,盧 霄
    2020年3期 ? No.287 ? P27-30
    摘要
    引用本文
    摘??要:以28d活性指數為85%的再生微粉按膠凝材料10%、20%、30%加入混凝土中,進行了再生微粉混凝土凍融循環試驗及抗硫酸鹽侵蝕性能研究。試驗結果表明,再生微粉摻量低于20%時,摻量越高,混凝土的抗凍性能越好;通過SEM結果發現,混凝土凍融損壞是因水分子受凍膨脹導致鈣礬石結晶裂縫和骨料與晶體間裂縫;再生微粉摻量越高混凝土抗硫酸鹽侵蝕性能越低,且隨著侵蝕時間的增加,該效果更加顯著;EDS結果表明,干濕循環破壞的混凝土內部S元素急劇增加,形成的碳硫硅鈣石膨脹導致混凝土內部產生結構裂縫是混凝土損傷的主要原因。?Abstract:?InsteadofregularclassⅡflyash,therecycledfinepowderswithanactivityindexof85%for28dweremixedinconcrete,andthesubstitutionrateswere10%、20%、30%ofcementitiousmaterials.Thefreeze-thawcycletestsandmicroperformanceofrecycledfinepowderconcretewerecarriedout.Theresultsshowthatwhentherecycledpowdercontentislowerthan20%,thehigherdosage,thebettertheFreeze-thawresistanceofconcrete.TheresultsofSEMindicatethattheprincipleoffreezing-thawingdamageofconcreteisthatthewatermoleculesexpandedduringfreezingcausedthecrystalcracksofettringiteandthecracksbetweenaggregatesandcrystals.Thehigherthecontentofrecycledfinepowder,thelowertheresistanceto?sulfateerosionofconcrete.Throughenergyspectrumanalysis,itisfoundthattheSelementintheconcretedestroyedbythewetanddrycycleincreasessharply,andtheexpansionofthaumasitecausescracksintheinternalstructureoftheconcrete.
    張平,古龍龍,李凱,等.再生微粉混凝土抗凍性及抗硫酸鹽侵蝕性能研究[J].混凝土與水泥制品,2020(3):27-30.
    ZHANG P,GU L L,LI K,et al.Study on Frost Resistance and Sulfate Resistance of Concrete with Recycled Fine Powder[J].China Concrete and Cement Products,2020(3):27-30.
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