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    蘇州混凝土水泥制品研究院有限公司

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    第三期

    凍融循環作用下鹽分對混凝土耐久性影響的試驗研究
    凍融循環作用下鹽分對混凝土耐久性影響的試驗研究
    • 田俊壯,夏慧蕓,牛昌昌,張 雷,陳華鑫
    2016年第3期
    摘要
    引用本文
    摘??要:以青海德香高速公路大橋橋墩混凝土為依托,對其沿線主要易溶鹽含量進行分析,通過室內模擬實驗,配制了7種腐蝕溶液,并設計四種配合比混凝土,通過外觀形貌、質量損失率和相對動彈模量三方面研究凍融循環作用下,鹽分對混凝土耐久性的影響。結果表明:鹽蝕-凍融循環作用下,單一鹽類如Na2SO4、MgSO4、NaCl溶液對混凝土破壞形式和程度均不相同;上述幾種鹽的復合溶液對混凝土的破壞同時存在促進和抑制作用,即在低濃度鹽溶液中,鹽分加劇混凝土的凍融損傷,在高濃度鹽溶液中,溶液冰點很低,緩解了混凝土凍融損傷。Abstract:BasedonbridgepierconcreteofDexianghighwaybridgeinQinghaiProvince,theconcentrationandthemaintypesofthedissolvedsaltsalongDexianghighwaywereanalyzed,andsevensolutionsofdifferentconcentrationofsaltwerepreparedandfourkindsofconcreteweredesignedbylaboratoryexperiments.Surfacemorphologies,weightlossrateandrelativedynamicelasticitymoduluswereusedtostudytheeffectsofsaltonconcretedurabilityunderfreeze-thawcycle.Theresultsshowthatundersaltcorrosion-freeze-thawcycletests,thecorrosiondamageformsandextentsofconcretearedifferentwhendifferentsinglesaltsolutionwasadopted,suchasNa2SO4,MgSO4andNaCl.However,promotionandinhibitionexistatthesametime,whensaltfreezedamagewasconductedincompositesaltsolution.Lowconcentrationsaltaggravatesfreeze-thawdamageofconcrete,whentheconcentrationofsaltsolutionishigh,freezingpointisverylow,whichcanreducefreeze-thawdamageofconcrete.
    碳納米管水泥基復合材料機敏性能研究
    碳納米管水泥基復合材料機敏性能研究
    • 李云峰1,孫章平1,孫 靜1,張 弛1,張 濤2
    2016年第3期
    摘要
    引用本文
    摘 要:為了研究碳納米管水泥基復合材料在循環荷載下的機敏性能,將多壁碳納米管作為增強相,采用非共價表面活性劑吸附分散技術,使多壁碳納米管盡可能均勻地分散在水泥凈漿中制備碳納米管水泥基復合材料,分析了碳納米管摻量、試件尺寸、循環荷載等因素對其機敏性能的影響。試驗結果表明:在循環荷載作用下,納米管水泥基復合材料的電阻率ρ隨著加卸載出現可逆性循環變化,表現出了良好的機敏性能,多壁碳納米管的較佳摻量為0.2%,且尺寸較小的試件表現出的機敏性更優。因此,碳納米管復合材料可發展成為一種新型的傳感器用于結構的健康監測。 Abstract: The sensing properties of carbon nanotubes reinforced cement-based composites under cyclic loading are studied in this paper. The multi-walled carbon nanotubes was used as strengthening phase in Portland cement composites, it was dispersed using the non-covalent surfactant adsorption dispersion technology. The influence of the multi-walled carbon nanotubes content, the specimen size and the cyclic load on the carbon nanotubes reinforced cement-based composites sensing properties was measured. The experimental results show that carbon nanotubes reinforced cement-based composites resistivity show reversible cycle changes with loading and unloading, they exhibit a strong sensing properties, the better multi-walled carbon nanotubes content is 0.2% in the tests, and the smaller size specimens are better than the bigger ones. Therefore, carbon nanotubes composite materials can be developed into a new type of sensor used for structural health monitoring.
    以硅鉻渣為細骨料的混凝土性能研究
    以硅鉻渣為細骨料的混凝土性能研究
    • 張 瀟1,水中和1,汪發紅2
    2016年第3期
    摘要
    引用本文
    摘 要:對硅鉻渣作為細骨料全部或部分取代天然河砂制備的混凝土性能進行了研究,包括混凝土的力學性能、耐久性能,并通過掃描電子顯微鏡(SEM)和顯微硬度測試技術初步探討了硅鉻渣對混凝土界面過渡區的影響。試驗結果表明,硅鉻渣具有一定火山灰活性,作為混凝土細骨料能提高混凝土強度,改善混凝土過渡區結構,使混凝土耐久性能得到顯著提高,其中摻80%硅鉻渣作為細骨料制備的混凝土效果更好。 Abstract: The basic properties of the concrete in which silicon chromium slag(SCS) substituted natural river sand are studied, including the mechanical properties and the durability of hardened concrete. Based on the testing technology of SEM and microhardness, the influence of SCS on the interfacial transition zone (ITZ) was also studied. The results indicate that the SCS has a certain pozzolanic activity, SCS that was used as fine aggregates can effectively raise concrete compressive strength and improve structure of interfacial transition zone, which significantly make the good durability performance of concrete. The concrete which was mixed with 20% fine sand and 80% SCS has better performances than that of concrete with 100% SCS.
    基于多孔粉煤灰的水泥基相似材料自養護技術研究
    基于多孔粉煤灰的水泥基相似材料自養護技術研究
    • 戴銀所,王明洋,范鵬賢,嚴澤臣,吳蘭冬
    2016年第3期
    摘要
    引用本文
    摘??要:為了提高水泥基相似材料在自然環境下的養護效果,采用多孔粉煤灰作為填料研究其對相似材料性能的影響規律。結果表明:水泥基相似材料中,水泥作為凝膠材料提供相似材料的強度;在空氣中進行自然養護的條件下,通過摻入多孔粉煤灰,能夠提高相似材料的力學性能。粗粉煤灰摻量5%時相對于沒有摻時的強度增加值超過50%~100%,粗粉煤灰替代10%時又比替代5%的強度增加值超過20%~80%。由于粗粉煤灰具有不同尺寸的開口孔,在水泥漿體攪拌過程中這些孔可以吸收并儲存適量的水,在水泥硬化過程中,這些儲存在孔中的水就會逐漸釋放出來,表現為對水泥基相似材料一定的自養護功能。Abstract:Inordertoimprovethecuringeffectofcement-basedequivalentmaterialforgeo-mechanicalmodeltest,porousflyashwasusedasfiller,underthedrycondition.Thedeformationparametersofmortararestudied.Theresultsshowthatcementisthebaseofstrengthforequivalentmaterial,thecompressivestrengthcanbeimprovedbyadjustingfillergrade.Whenthegravelwere5%replacedbyflyash,thestrengthofmortarwasimproved50%~100%,andthestrengthofmortarreplacedby10%wasimproved20%~80%thanthatofmortarby5%,whichindicatedthatindryconditions,porousflyashhadself-curingeffectoncement-basedequivalentmaterial.
    基于灰關聯熵法的氯氧鎂水泥混凝土強度影響因素分析
    基于灰關聯熵法的氯氧鎂水泥混凝土強度影響因素分析
    • 張紀陽1,關博文1,沙 炯1,陳華鑫1,馬 慧1,楊 濤2
    2016年第3期
    摘要
    引用本文
    摘??要:根據已有試驗數據,借助灰關聯熵分析的手段,定量分析了輕燒粉用量、MgO/MgCl2摩爾比、MgCl2濃度、減水劑用量、砂率和粗骨料最大粒徑等對氯氧鎂水泥混凝土7d抗壓強度性能影響的主次關系和影響程度。經分析計算得出:對氯氧鎂水泥混凝土抗壓強度影響最大的是MgO/MgCl2摩爾比和輕燒粉用量,其次為砂率、MgCl2濃度和粗骨料最大粒徑。結果表明,在氯氧鎂水泥混凝土多因素的分析中,灰關聯熵法是一種實用、簡潔且較準確的方法,其結論可為氯氧鎂水泥混凝土配合比設計提供有效的計算依據。Abstract:Accordingtotheexperimentaldata,withthegreyrelationentropymethod,thelevelsofeffectofmixdesignparametersonthestrengthofmagnesiumoxychloridecementconcretearequantitativelyanalyzed.Thesemixdesignparametersareamountofmagnesiumoxide,themolarratioofMgO/MgCl2,theconcentrationofMgCl2,dosageofwaterreducer,sandratio,themaximumsizeofcoarseaggregate.Accordingtotheanalysisresult,itcanbeconcludedthatthemolarratioofMgO/MgCl2andamountofmagnesiumoxidehavethelargestimpactonthestrengthofmagnesiumoxychloridecementconcrete.Theothers,whicharearrangefrombigtosmall,aresandratio,theconcentrationofMgCl2andthemaximumsizeofcoarseaggregate.Theresultsshowthatgreyrelationentropyisasimpleandfeasiblemethodwithmoreaccurateresultstoanalyzemultipleinfluencingfactorsofmagnesiumoxychloridecementconcrete.Theresultcanprovideaneffectivecalculationbasisformagnesiumoxychloridecementconcretemixdesign.
    石墨烯和碳納米管水泥基復合材料研究進展
    石墨烯和碳納米管水泥基復合材料研究進展
    • 劉 瓊1,2,許清風1,2,李向民1,2
    2016年第3期
    摘要
    引用本文
    要:石墨烯和碳納米管均為納米材料,具有高強度、高導電性、高導熱性等優點。石墨烯和碳納米管應用到水泥基復合材料中能提高其強度、改善其耐久性、并使水泥基復合材料具有導電性和壓敏性能。本文總結了石墨烯和碳納米管的打散和氧化方法,歸納了石墨烯和碳納米管對水泥基復合材料的增強增韌效果和機理,分析比較了其對水泥基復合材料耐久性、導電性和壓敏性的影響,并總結了幾種常用的細微觀研究手段,為開展進一步研究提供參考。 Abstract: Graphene and carbon nano tube are both nano materials, and they both have high strength, high electricity and heat conductivity. Graphene and carbon nano tube can be used in cementitious composite material to enhance its strength, improve its durability and make it have electricity conductivity and pressure sensitive. The dispersion and oxidation methods, the effect and mechanism of strengthening, the influence on durability, conductivity and pressure sensitive are all analysed and discussed. And the common micro- and meso- research methods are listed for providing experiences for further study.
    頂進施工法用鋼筋混凝土拱涵的研制
    頂進施工法用鋼筋混凝土拱涵的研制
    • 朱 麗1,王慶喜1,趙寶閣1,楊海榮2,金作先2,王先進2
    2016年第3期
    摘要
    引用本文
    摘 要:探討了城市綜合管廊用的幾種頂進施工法鋼筋混凝土拱涵的斷面形式,分析了方形、圓形等混凝土拱涵的優勢,設計了組合型鋼筋混凝土圓拱涵。該涵體制作采用芯模振動工藝,局部采取加固措施,具有耐久性優良、勞動生產率高、現場安裝方便、頂進力較小等優點。 Abstract: Several kinds of the cross section forms of reinforced concrete arch culvert for urban comprehensive utility tunnel using jacking construction method are discussed. Based on the advantages of square and circular concrete arch culvert, a combination type concrete circular arch culvert is designed. The concrete circular arch culvert are produced by using core mould vibration technology and local reinforcement measures and have the advantages of excellent durability, high productivity, easy installation, and the small jacking force.
    新型快速運模地鐵管片自動化生產線
    新型快速運模地鐵管片自動化生產線
    • 王 曙,路正東
    2016年第3期
    摘要
    引用本文
    摘 要:介紹了一種新型快速運模地鐵管片自動化生產線,該生產線將管片脫模區和澆筑作業區分離,實現了成品管片脫模及轉運物流、鋼筋骨架物流和混凝土物流三大物流的分離,進一步提升了各物流流轉效率,從而大幅提升管片的生產能力。通過對比分析快速運模管片生產線與2+4管片生產線,闡述了快速運模管片生產線的優勢和特點。 Abstract:A new type of automatic production line capable of transporting segment moulds rapidly is introduced. This kind of production line separates the demoulding area from the concreting area. It also implements the separation of three material flows consisting of the transport of finished segments after demoulding, the flow of steel reinforcement cages and the flow of concrete. The efficiency of logistic flows can then be enhanced so that the production capacity of segments can be greatly improved, too. Here, the contrastive analysis between the segment production line transporting segment moulds rapidly and the segment production line producing 2+4 type segments is done, and the merits and traits of the segment production line transporting segment moulds rapidly are expounded.
    圍巖彈性反力系數對盾構管片力學性能的影響分析
    圍巖彈性反力系數對盾構管片力學性能的影響分析
    • 劉云花1,賈文達2,張曉靜1,秦玉嬌1
    2016年第3期
    摘要
    引用本文
    摘 要:運用荷載-結構法建立盾構隧道管片的三維模型,設置合力的管片接頭接觸模型,研究了不同圍巖彈性反力系數下盾構管片的力學性能。結果表明:隨著圍巖彈性反力的增大,管片的內力值、位移值及接頭內力值、接頭相對滑動都有減小的趨勢;同樣,在圍巖彈性反力的減小時,管片的內力值、位移值及接頭內力值、接頭相對滑動都有增大的趨勢。在圍巖彈性反力系數大于400MPa/m時對管片內力、變形的影響不明顯,而在圍巖彈性反力系數小于400MPa/m時對管片內力、變形的影響比較大。 Abstract: The 3D model of shield tunnel segments was established by load-structure method, and a rational contact model of joints was set up. Based on this, the mechanical properties of tunnel segments under the different elastic resistant coefficient are analyzed. The results show that with the increase of the elastic resistant coefficient, segments internal force, displacement, joints internal force and joints sliding have a tendency to decrease; with the decrease of the elastic resistant coefficient, segments internal force, displacement, joints internal force and joints sliding have a tendency to increase. When the elastic resistant coefficient is greater than 400MPa/m, the influence of internal forces, deformation for segment are not obvious, but when the elastic resistant coefficient is less than 400MPa/m, the influence of internal forces, deformation for segment are relatively large.
    新型連續端鉤鋼纖維增韌混凝土殘余彎拉強度分析
    新型連續端鉤鋼纖維增韌混凝土殘余彎拉強度分析
    • 丁 聰1,郭麗萍1,陳 波2,孫 斌3,徐文曉4
    2016年第3期
    摘要
    引用本文
    摘??要:為了研究不同鋼纖維摻量、不同膠凝材料組成對混凝土殘余彎拉強度的影響,根據金屬纖維混凝土測試方法測試了鋼纖維摻量為30kg/m3與40kg/m3的新型連續端鉤型鋼纖維增韌混凝土的載荷和切口張開位移值(CMOD)或撓度曲線圖。試驗結果表明,隨著鋼纖維摻量的增加,鋼纖維混凝土殘余彎拉強度及極限抗折強度均隨之增加;硅酸鹽水泥復摻硫鋁酸鹽水泥的鋼纖維混凝土殘余彎拉強度及極限抗折強度較普通鋼纖維混凝土有所降低。鋼纖維摻量的提高有助于提高混凝土的增強阻裂能力。Abstract:Inordertostudytheinfluenceofdifferentsteelfibercontentandthecompositionofdifferentcementitiousmaterialsontheresidualflexuralstrengthofconcrete,accordingtotestmethodofmetalfiberconcrete,theloadandtheCMODordeflectioncurveofthenewtypeofcontinuoussteelfiberreinforcedwhichsteelfibercontentis40kg/m3and30kg/m3weretested.Theexperimentalresultsshowthat,theresidualflexuralstrengthandultimateflexuralstrengthofsteelfiberreinforcedconcreteareincreasedwiththeincreasingofsteelfibercontent.TheresidualflexuralstrengthandultimateflexuralstrengthofthesteelfiberreinforcedconcretemixedPortlandcementwithsulphoaluminatecementarelowerthanthatofordinarysteelfiberreinforcedconcrete.Theincreaseofsteelfibercontentishelpfultoimprovethecapacityofresistcracking.
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