混凝土研究_2020_《混凝土與水泥制品》雜志社

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混凝土研究

3D打印混凝土技術在新冠肺炎防疫方艙中的應用

王香港,王申,賈魯濤,等.3D打印混凝土技術在新冠肺炎防疫方艙中的應用[J].混凝土與水泥制品,2020(4):1-4,13. WANG X G,WANG S,JIA L T,et al.Application of 3D Printing Technology in Epidemic Prevention Cabins during the Outbreak of COVID-19[J].China Concrete and Cement Products,2020(4):1-4,13.

2020年第4期

摘要

引用本文

摘?要：以南京市江北新區防疫測控方艙為工程案例，展示了建筑3D打印技術在應對新冠肺炎疫情及類似緊急公共事件中的應用方式，探討了3D打印技術的優勢和未來的發展趨勢。實踐表明，建筑3D打印技術在防疫階段具有較大的優勢。利用3D打印技術進行防疫測控方艙的建造，其建造工藝簡潔，生產周期短，安裝便捷。構件打印過程由計算機自動控制，人工干預少，且構件以單元模塊進行打印，安裝用工少。目前，該類型的防疫方艙已經在南京、雄安、海門、濮州等地投入使用。Abstract:TakingtheepidemicpreventioncabinsatJiangbeiNewAreaofNanjingasanengineeringcase,theapplicationof3DprintingconstructionduringtheoutbreakofCOVID-19andotherpublichealthemergencyareintroduced.Theadvantagesandfuturedevelopmentof3Dprintingconstructionarediscussedaswell.Thepracticeshowsthat3Dprintingconstructionhassomeobviousadvantagesforpublicapplication.Specifically,3Dprintingtechnologyenablestheconstructionprocessestobesimplified,withshortenedproductionperiodandconvenientinstallation.Theprintingprocessisautomaticallycontrolledbythecomputer,withlessmanualintervention.Thecomponentsareprintedasunitmodulesthatcanbeinstalledbyafewlabors.Sofar,thistypeofcabinshascomeintoserviceinNanjing,Xiongan,Haimen,Puzhouandothercities.

王香港,王申,賈魯濤,等.3D打印混凝土技術在新冠肺炎防疫方艙中的應用[J].混凝土與水泥制品,2020(4):1-4+13. WANG X G,WANG S,JIA L T,et al.Application of 3D Printing Technology in Epidemic Prevention Cabins during the Outbreak of COVID-19[J].China Concrete and Cement Products,2020(4):1-4+13.

碳納米管水泥基復合材料溫敏及濕敏性能研究

袁嬌，劉小艷，陳玉泉，馬文莉，李田雨，江波，揭漢鐸

2020年第4期

摘要

引用本文

摘?要：將碳納米管（CNTs）作為導電填料制備了碳納米管水泥基復合材料（CNT/CC），分別研究了CNT/CC在不同溫度、濕度下的電阻率變化規律，探討其作為本征型溫、濕度傳感器的可行性。結果表明，試件在25～55℃區間內具有較好的溫敏性，CNTs摻量為0.5%的CNT/CC試件單位溫度內電阻率變化率在1.5%以上，且在升溫和降溫條件下，電阻率變化率隨溫度線性變化的相關系數分別為-0.950和-0.984；試件內部含水率在0.6%～6.0%時的濕敏性能最佳，且CNTs摻量為0.5%的試件電阻率變化率最大，達到91.2%。Abstract:Carbonnanotubes(CNTs)wereusedasconductivefillerstofabricatecarbonnanotube/cementcomposite(CNT/CC).Bystudyingthechangerateofresistivityunderdifferenttemperatureandhumidity,whetherCNT/CCcouldbeabletomakeanintrinsictemperatureandhumiditysensorwasdiscussed.Theresultsshowthatspecimenshavegoodtemperaturesensitivitybetween25℃and55℃,thechangerateofresistivitycomesupto1.5%/℃.WhenCNT/CCcontaining0.5%CNTsisheatedupandcooleddown,thelinearcoefficientis-0.950and-0.984respectively.Specimenshavethebesthumiditysensitivitywhenwatercontentisbetween0.6%and6.0%.Whileadding0.5%CNTs,thechangerateofresistivityis91.2%,whichreachesthemaximumvalue.

袁嬌,劉小艷,陳玉泉,等.碳納米管水泥基復合材料溫敏及濕敏性能研究[J].混凝土與水泥制品,2020(4):5-8. YUAN J,LIU X Y,CHEN Y Q,et al.Study on Temperature and Humidity Sensitivity of Carbon Nanotube/Cement Composite(CNT/CC)[J].China Concrete and Cement Products,2020(4):5-8.

堿式硫酸鎂水泥基樹脂透光混凝土界面特性的研究

陳思佳1,2，徐迅1,3，王宗浩2，曾佳莉2，李瑩江2，陳海倫2，潘英杰2，陳婉瑩2

2020年第4期

摘要

引用本文

摘?要：采用界面破壞模型分析法和斜剪黏結強度法對比研究了堿式硫酸鎂水泥基與硅酸鹽水泥的樹脂透光混凝土的強度損失率。研究結果表明，堿式硫酸鎂水泥基樹脂透光混凝土的28d抗壓強度損失率為19.9%，水泥砂漿與樹脂界面7d斜剪試驗強度為6.8MPa；硅酸鹽水泥基透光混凝土的28d抗壓強度損失率為41.3%，水泥砂漿與樹脂界面7d斜剪試驗強度為6.1MPa。堿式硫酸鎂水泥在界面結合方面表現更優。Abstract:Theinterfacefailuremodelanalysisandobliqueshearbondstrengthmethodwereusedtocomparethecompressivestrengthlossrateofresintransparentconcretewithbasicmagnesiumsulfatecementandportlandcement.Theresultsshowthatthe28dcompressivestrengthlossrateofbasicmagnesiumsulfatecement-basedresintransparentconcreteis19.9%,the7dobliqueshearstrengthoftheinterfaceofcementmatrixandresinis6.8MPa,andthe28dcompressivestrengthlossrateofportlandcement-basedtransparentconcreteis41.3%,the7dobliqueshearstrengthoftheinterfaceofcementmatrixandresinis6.1MPa.Thus,basicmagnesiumsulfatecementhasbetterperformanceininterfacebonding.

陳思佳,徐迅,王宗浩,等.堿式硫酸鎂水泥基樹脂透光混凝土界面特性的研究[J].混凝土與水泥制品,2020(4):9-13. CHEN S J,XU X,WANG Z H,et al.Study on Interface Characteristics of Basic Magnesium Sulfate Cement-based Resin Transparent Concrete[J].China Concrete and Cement Products,2020(4):9-13.

多因素作用下地下粉煤灰混凝土抗壓強度灰熵分析及微觀結構

杜輝，紀榮健，胡杰

2020年第4期

摘要

引用本文

摘?要：通過強度試驗，運用灰關聯熵分析方法，以水壓力、荷載、硫酸鹽、氯鹽與侵蝕時間作為影響因素，研究地下粉煤灰混凝土抗壓強度變化情況及其關聯程度，結合SEM、XRD分析了不同工況下混凝土內部結構的微觀變化。結果表明：灰關聯熵分析方法可以有效區分多種因素的主次關系，在選取的五種因素中，硫酸鹽與混凝土強度退化灰關聯熵值最大；無水壓力時，Cl-會先進入混凝土內部與水泥水化產物生成Friedel’s鹽。有水壓力時，水壓力加速硫酸根離子侵蝕混凝土試塊，Cl-結合能力減弱并且多以自由離子形式存在于粉煤灰混凝土中；隨著侵蝕時間增加，多因素作用下粉煤灰混凝土生成產物石膏越來越多，內部結構越來越稀疏，使得抗壓強度下降速率大于單因素與雙因素作用下粉煤灰混凝土抗壓強度下降速率。Abstract:Throughstrengthtestandgreyrelationentropyanalysismethod,takingwaterpressure,load,sulfate,chlorideanderosiontimeasinfluencingfactors,thevariationofcompressivestrengthofundergroundflyashconcreteanditscorrelationdegreewerestudied.MicroscopicchangesofsoilinternalstructureunderdifferentconditionswasanalyzedbySEMandXRD.Theresultsshowthatthegreyrelationalentropyanalysismethodcaneffectivelydistinguishtheprimaryandsecondaryrelationshipsofvariousfactors.Amongthefiveselectedfactors,thegreyrelationalentropyofstrengthdegradationofsulfateandundergroundflyashconcreteisthelargest.Underanhydrouspressure,chlorideionsfirstentertheconcreteandcementhydrationproductstoformFriedel′ssalt.Whenthereiswaterpressure,thewaterpressureacceleratessulfateiontoerodeconcreteblocks,andchlorideionbindingabilitydecreases,andmostofthemexistinflyashconcreteintheformoffreeions.Withtheincreaseoferosiontime,moreandmoregypsumisproducedinconcreteofflyashconcreteundertheactionofmultiplefactors.Asthestructurebecomesmoreandmoresparse,thedeclinerateofcompressivestrengthofflyashconcreteisgreaterthanthatofflyashconcreteundertheactionoftwofactors.

杜輝,紀榮健,胡杰.多因素作用下地下粉煤灰混凝土抗壓強度灰熵分析及微觀結構[J].混凝土與水泥制品,2020(4):14-18,23. DU H,JI R J,HU J.Grey Entropy Analysis and Microstructure of Compressive Strength of Underground Fly Ash Concrete under Multi-factor Action[J].China Concrete and Cement Products,2020(4):14-18,23.

未淡化海砂超高性能混凝土的性能研究

王晶1，王祖琦1，倪博文2，周永祥1，宋普濤1，冷發光1

2020年第4期

摘要

引用本文

摘?要：對利用未經淡化處理海砂配制的超高性能混凝土（UHPC）的抗壓強度、抗折強度、劈裂抗拉強度、彈性模量、抗凍性能、抗氯離子滲透性能和護筋性能進行了系統的試驗研究。結果表明：抗壓強度、抗折強度和劈裂抗拉強度分別大于120MPa、20MPa和12MPa，彈性模量大于40GPa，其抗凍等級超過F500，電通量值不超過50C，力學性能和耐久性指標均滿足GB/T31387—2015《活性粉末混凝土》的要求。此外，本試驗顯示，經過40次的鹽水浸烘循環試驗后，未淡化海砂UHPC中的鋼筋銹蝕風險較低。Abstract:Thecompressivestrength,flexuralstrength,splittingtensilestrength,elasticmodulus,frostresistance,chloride-permeationresistanceandprotectionforsteelofultra-highperformanceconcrete(UHPC)madewithuntreatedseasandwerestudied.Theresultsofresearchshowthat:compressivestrength,flexuralstrength,splittingtensilestrengthandelasticmodulusarehigherthan120MPa、20MPa、12MPaand40GParespectively,andthefrostresistancedegreefarexceedesF500andelectricfluxislessthan50C.Accordingtotheaboveresults,themechanicalpropertyanddurabilitycanmeettherequirementsofcurrentnationalstandardGB/T31387—2015ReactivePowderConcrete.Inaddition，through40timesofsaltwaterimmersiondryingcycletest,thesteelinUHPCmadewithuntreatedseasandshowslowriskofcorrosion.

王晶,王祖琦,倪博文,等.未淡化海砂超高性能混凝土的性能研究[J].混凝土與水泥制品,2020(4):19-23. WANG J,WANG Z Q,NI B W,et al.Study on the Properties of Ultra-high Performance Concrete with Untreated Sea Sand[J].China Concrete and Cement Products,2020(4):19-23.

關于混凝土保護層厚度合理性的相關研究

王鵬剛1,2，焦茂鵬2，范宏2，田礫1,2，王緣2，尹暖暖2，張鑫2

2020年第4期

摘要

引用本文

摘?要：對歐美及我國規范中保護層厚度相關要求作了對比，并分別按照碳化壽命準則、銹脹開裂壽命準則對保護層厚度合理值進行了計算。結果表明，我國規范中保護層厚度取值與銹脹開裂準則計算值接近，與歐美規范值相比偏小，在惡劣環境下尤其明顯，最大差值達到30%以上，并且規范中未考慮施工允許偏差的影響；按碳化準則計算時，現行規范要求的保護層厚度值遠達不到相應耐久年限的可靠指標要求。在設計和施工階段，關于保護層厚度的要求應進一步加強。這將使結構更安全耐久，并減少使用期內的維護及大修次數，降低能耗。Abstract:ThecomparisonofconcretecoverthicknessrequirementsinEuropeanandAmericanandChinesecodeswascarriedout,andthethicknessoftheconcretecoverwascalculatedaccordingtothecarbonizationlifecriterionandthecorrosioncrackinglifecriterion,respectively.TheresultsshowthatthethicknessoftheconcretecoverinChinesespecificationsisclosetothecalculatedvalueoftherustexpansioncriterion,andit’ssmallcomparedwiththeEuropeanandAmericannormativevalues,especiallyinharshenvironments,themaximumdifferenceismorethan30%,andtheinfluenceofconstructiontoleranceisnotconsideredinthespecification.Whencalculatedaccordingtothecarbonizationcriteria,thethicknessoftheconcretecoverrequiredbythecurrentspecificationisfarfromthereliableindexrequirementforthecorrespondingenduranceperiod.Therequirementsforthethicknessoftheconcretecovershouldbefurtherstrengthenedduringthedesignandconstructionphases.Thiswillmakethestructuresaferandmoredurable,andreducethenumberofmaintenanceandoverhaulsduringtheuseperiod,reducingenergyconsumption.

王鵬剛,焦茂鵬,范宏,等.關于混凝土保護層厚度合理性的相關研究[J].混凝土與水泥制品,2020(4):24-28. WANG P G,JIAO M P,FAN H,et al.Sesearch on the Rationality of Concrete Cover Values[J].China Concrete and Cement Products,2020(4):24-28.

清水及氯鹽環境下陶?；炷羶鋈趽p傷規律試驗研究

李秀1，徐文康2，朱紅兵2，許成祥2，向杰2，袁強松2,3

2020年第4期

摘要

引用本文

摘? ?要：對摻加1%聚丙烯纖維及未摻纖維的兩組陶?；炷猎嚰?，分別進行了清水凍融和3% NaCl溶液凍融試驗，觀察了凍融循環后試件的外觀變化形態，測試研究了試驗過程中試件的相對動彈性模量、質量損失率、剩余抗壓強度等損傷量的變化規律。研究結果表明：相同凍融次數時，與清水凍融環境比，氯鹽凍融環境下試件的剝蝕和骨料外露現象更明顯，相對動彈性模量、質量損失率、剩余抗壓強度等指標退化更為嚴重；摻入聚丙烯纖維可明顯改善陶?；炷恋目箖鲂阅?。分別以相對動彈性模量和剩余抗壓強度作為損傷變量，建立了能反映凍融損傷進程的陶?；炷羶鋈趽p傷模型，參數擬合精度較高。 Abstract: Using two groups of ceramsite concrete specimens with 1% polypropylene fiber and without fiber, freeze-thaw tests in clear water and 3% NaCl solution were carried out respectively to observe the appearance changes of the specimens after freeze-thaw cycles and test the changes of relative dynamic elastic modulus, mass loss rate and residual compressive strength of the specimens during the test process. The results show that the denudation and aggregate exposure are more obvious in chloride salt freeze-thaw environment than in clear water freeze-thaw environment at the same freeze-thaw times, and the degradation of relative dynamic elastic modulus, mass loss rate and residual compressive strength is more serious. The frost resistance of ceramsite concrete can be obviously improved by adding polypropylene fiber. Taking relative dynamic modulus of elasticity and residual compressive strength as damage variables, a freeze-thaw damage model of ceramsite concrete was established, which could reflect the damage process of freeze-thaw, and the parameter fitting accuracy is high.

李秀,徐文康,朱紅兵,等.清水及氯鹽環境下陶?；炷羶鋈趽p傷規律試驗研究[J].混凝土與水泥制品,2020(4):29-32. LI X,XU W K,ZHU H B,et al.Experimental Study on the Damage Rule of Ceramsite Concrete under the Environment of Clear Water or Chloride solution[J].China Concrete and Cement Products,2020(4):29-32.

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