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    蘇州混凝土水泥制品研究院有限公司

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    發布時間:2020-01-06 00:00:00
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    第五期

    機制砂顆粒形狀對砂漿流變性能的影響研究
    機制砂顆粒形狀對砂漿流變性能的影響研究
    • 周新文1,2,劉建忠2,3,劉光嚴3,劉加平1,2
    2020年第5期
    摘要
    引用本文
    摘?要:為研究機制砂顆粒形狀對砂漿流變性能的影響,使用數字圖像處理技術(DIP)對砂顆粒形狀進行了定量表征,設計試驗測量了砂漿流變曲線并計算了砂漿屈服應力與表觀黏度。結果表明,機制砂的長寬比(E)、寬高比(F)比天然河砂分別大14%、18%,說明機制砂棒狀和片狀程度高于天然河砂;砂漿流變曲線反映出砂顆粒形狀不規則會導致砂漿流動阻力增大,在高體積分數下更為顯著;根據Chateau模型擬合40%體積分數機制砂砂漿屈服應力是天然河砂的1.5倍;砂漿表觀黏度分析發現,機制砂砂漿表觀黏度大于天然河砂,在低剪切速率下尤其明顯。Abstract:Tostudytheeffectsofmanufacturedsandshapeonmortarrheologyproperty,thedigitalimageprocessing(DIP)methodwasusedtocharacterizesandparticleshapequantitatively,testsofmortarrheologycurvewereperformedanditsyieldstresswascalculatedbyrheologytest.ResultsshowthatEofmanufacturedsand(MS3)is14%biggerthanthatofriversand(RS),FofMS2is18%biggerthanthatofRS,consequently,soparticleshapeofMSismoreelongateandflatthanthatofRS.Besides,rheologycurveresultsshowthattheirregularshapesandwillincreaseresistancewhenmortarflowing,andtheeffectbecomesmoresignificantwithsandvolumeincreasing.BasedonChateaumodel,it′spredictedthatfor40%sandvolumemortar,yieldstressofMS3is1.5timesasRSduetoitsirregularsandshapeofMS3.
    周新文,劉建忠,劉光嚴,等.機制砂顆粒形狀對砂漿流變性能的影響研究[J].混凝土與水泥制品,2020(5):1-5. ZHOU X W,LIU J Z,LIU G Y,et al.Study of the Effect of Manufactured Sand Particle Shape on Mortar Rheological Property[J].China Concrete and Cement Products,2020(5):1-5.
    3D打印水泥基材料的建造性研究
    3D打印水泥基材料的建造性研究
    • 章蘇陽,蔣亞清,王 玉,潘亭宏
    2020年第5期
    摘要
    引用本文
    摘?要:通過塑性強度、靜態屈服應力和跳桌流動度的經時變化試驗,研究了納米黏土與減水劑協同作用對3D打印水泥基材料(3DPC)建造性的影響,并以流變性能為參考依據,建立了3DPC建造性的評價指標。結果表明,復摻納米黏土和增黏型聚羧酸減水劑的3DPC經時塑性強度和經時靜態屈服應力均隨納米黏土摻量增加而提高,納米黏土的適宜摻量為0.8%;當靜態屈服應力時變速率為2.0~4.2Pa/s時,可實現3DPC的擠出性與建造性的協同;在可打印、可建造窗口時間內,3DPC的跳桌流動度為170~190mm。摻用納米黏土和增黏型聚羧酸減水劑對3DPC的流變參數進行調控是提高3DPC建造性的有效途徑。Abstract:Buildabilityisanimportantperformanceparameterof3Dprintingcementitiousmaterials(3DPC).Effectofnano-clayandviscositymodifyingpolycarboxylatesuperplasticizer(VPCE)onbuildabilityof3DPCwasinvestigatedbytestingtimedependentgreenstrength,staticyieldstressandflowtable.Indexesforevaluationthebuildabilityof3DPCwereestablishedbasedonthereferenceofrheologicalparameter.ExperimentalresultsshowthatbothgreenstrengthandstaticyieldstressofVPCEdispersed3DPCincreasewithincreaseofnano-claydosage,andthesuitabledosageofnano-clayis0.8%.Synergybetweenextruderabilityandbuildabilitycanberealizedwhenthestaticyieldstressretentionrateequals2.0~4.2Pa/s.Duringprintwindowtime,flowtablevalueof3DPCis170~190mm.Itisaneffectivewaytoimprovethebuildabilityof3DPCbyrheologymodifyingtechniquebasedonnano-clayandVPCE.
    章蘇陽,蔣亞清,王玉,等.3D打印水泥基材料的建造性研究[J].混凝土與水泥制品,2020(5):6-9. ZHANG S Y,JIANG Y Q,WANG Y,et al.Research on Buildability of 3D Printing Cementitious Materials[J].China Concrete and Cement Products,2020(5):6-9.
    高抗蝕硅酸鹽水泥提高混凝土抗滲性能機理研究
    高抗蝕硅酸鹽水泥提高混凝土抗滲性能機理研究
    • 任雪梅1,2, 宋家茂1,2 ,郝挺宇1,2
    2020年第5期
    摘要
    引用本文
    摘?要:為探究高抗蝕硅酸鹽水泥提高混凝土的抗滲性能機理,試驗研究了普通硅酸鹽水泥混凝土及特制高抗蝕硅酸鹽水泥混凝土的抗壓強度、氯離子擴散系數和直流階躍電阻率。結果表明,高抗蝕硅酸鹽水泥不是通過提高混凝土強度而主要是通過降低內部空隙率及減少連通性來實現混凝土抗滲性的提升。Abstract:Inordertoexplorethemechanismofhighcorrosionresistanceportlandcementtoimprovetheimpermeabilityofconcrete,thecompressivestrength,rapidchloridediffusioncoefficientanddirectcurrentstepinputresistivityofconcretewithordinarycementandhighcorrosionresistantcement(HCRC)werestudied.TheresultsshowthatHCRCcanimprovetheimpermeabilityofconcretenotbyimprovingthestrengthofconcrete,butmainlybyreducingtheinternalporosityandconnectivity.
    任雪梅,宋家茂,郝挺宇.高抗蝕硅酸鹽水泥提高混凝土抗滲性能機理研究[J].混凝土與水泥制品,2020(5):10-12. REN X M,SONG J M,HAO T Y.Investigation on Mechanism of Permeability of Concrete with High Corrosion Resistant Portland Cement[J].China Concrete and Cement Products,2020(5):10-12.
    鹽漬土環境下混凝土中SO<sub>4</sub><sup>2</sup><sup>-</sup>擴散性試驗研究
    鹽漬土環境下混凝土中SO42-擴散性試驗研究
    • 王巖峰1,景 浩2,閆長旺3,孫 偉2
    2020年第5期
    摘要
    引用本文
    摘?要:為了研究西部鹽漬土環境下混凝土中SO42-的擴散性,測試了在不同溶液、不同干濕循環齡期下,混凝土中不同深度的SO42-含量。采用Fick第二定律為基本模型,考慮SO42-與混凝土結合能力以及混凝土為非均勻介質的特性,對SO42-擴散系數進行了分析討論。此外,基于XRD結果,分析了侵蝕過程中鈣礬石的生長情況以解釋說明鈣礬石的生成對SO42-擴散性的影響。結果表明,Cl-可促進侵蝕前期SO42-的侵蝕速度;西部鹽漬土環境下混凝土中SO42-的擴散系數與結合能力呈負相關關系,與侵蝕深度呈正相關關系;SO42-濃度越高,鈣礬石生長越快,鈣礬石膨脹作用會填充混凝土的既有裂縫,從而抑制SO42-擴散。Abstract:InordertostudythediffusionofsulfateionsinconcreteunderthesalinesoilenvironmentinwesternChina,thecontentofsulfateionsinconcreteatdifferentdepthsindifferentsolutionsandatdifferentwet-drycycleageswasdetermined.Ficksecondlawwasadoptedasthebasicmodel.Consideringtheabilityofsulfateionstobondwithconcreteandthecharacteristicsofconcreteasnon-uniformmedium,thediffusioncoefficientofsulfateionswasanalyzedanddiscussed.Atthesametime,ettringitecrystalstructurewasrefinedaccordingtotheX-raydiffractionresultsofconcretesamplesaftererosion,andthegrowthofettringiteduringerosionwasanalyzed,soastoexplaintheinfluenceofettringitegenerationonthediffusionofsulfateions.Theresultsshowthatchlorideioncanpromotetheerosionrateofsulfateionintheearlystageoferosion.ThereisanegativecorrelationbetweenthediffusioncoefficientandbindingcapacityofsulfateionsinthesalinesoilofwesternChina,andapositivecorrelationbetweenitandthedepthoferosion.Thehighertheconcentrationofsulfateions,thefasterthegrowthofettringite.Theexpansionofettringitewillfilltheexistingcracksofconcretetoinhibitethediffusionofsulfate.
    王巖峰,景浩,閆長旺,等.鹽漬土環境下混凝土中SO42-擴散性試驗研究[J].混凝土與水泥制品,2020(5):13-17,24. WANG Y F,JING H,YAN C W,et al.Study on the Diffusion of Sulfate Ions in Concrete Under the Saline Soil Environment[J].China Concrete and Cement Products,2020(5):13-17,24.
    大面積板梁結構用補償收縮混凝土的配制
    大面積板梁結構用補償收縮混凝土的配制
    • 閻培渝1,陳煒一1,趙海濤2,王海龍3,華東旗2,李習碩2,漆志祥2,康 凱2
    2020年第5期
    摘要
    引用本文
    摘?要:為滿足大型電子工業廠房大面積樓板梁結構施工的抗裂性能要求,對比研究了HCSA膨脹劑及復合膨脹劑(MgO膨脹劑與HCSA膨脹劑復摻)的性能,并配制了高抗裂性的補償收縮混凝土。試驗結果表明,兩種膨脹劑配制的C40補償收縮混凝土都具有補償收縮、防止開裂的效果。摻加復合膨脹劑的補償收縮混凝土早期強度稍低,溫升小,但補償收縮能力較強,有利于改善大體積深梁與薄板同時澆筑的混凝土結構的抗裂性。Abstract:Theperformanceofdifferentkindsofexpansiveagentwasstudiedforthepreparationofshrinkage-compensatingconcretewithexcellentanti-crackingabilitytosatisfytheconstructingrequirementoflarge-scalebeamandslabstructureofelectronicplant.ThecomparingresultsofusingHCSAexpansiveagentaloneandcomplexlyusingHCSAexpansiveagentandMgOexpansiveagenttogethershowthattheshrinkage-compensatingconcretepreparedwithbothtwokindsofexpansiveagentpossessesanti-crackingability.Theconcretepreparedwithcomplexexpansiveagenthasalittlelowearlystrength,lowtemperaturerisingandstrongshrinkage-compensatingability.Itbenefitstheincreaseofanti-crackingabilityfortheconcretestructureinwhichthelargevolumedeepbeamandthinplateiscastsimultaneously.
    閻培渝,陳煒一,趙海濤,等.大面積板梁結構用補償收縮混凝土的配制[J].混凝土與水泥制品,2020(5):18-20,24. YAN P Y,CHEN W Y,ZHAO H T,et al.The Preparation of Shrinkage-Compensating Concrete for the Construction of Largescale Beam and Slab Structure[J].China Concrete and Cement Products,2020(5):18-20,24.
    本體聚合固體聚羧酸系保坍劑的工業化制備及性能研究
    本體聚合固體聚羧酸系保坍劑的工業化制備及性能研究
    • 陳國新1,2,3,4,祝燁然1,2,3,4,杜志芹1,2,3,4,溫金保1,2,3,4
    2020年第5期
    摘要
    引用本文
    摘?要:選用復合引發劑調節反應活化能,以異戊烯醇聚氧乙烯醚(TPEG)、丙烯酸(AA)、馬來酸酐(MAH)為主要原料,通過工藝調整及工業化設備選型制備了本體聚合固體聚羧酸系保坍劑PC-702S2。通過GPC研究了工業化條件下保坍劑的轉化率、分子量及分子多分散性(PDI),并基于紅外光譜測試結果討論了PC-702S2保坍劑的結構特征。研究結果表明,PC-702S2的轉化率為94.43%,PDI為1.283,達到常規水溶液聚合保坍劑的性能,切片后的粒徑范圍≤300μm,適于工業化推廣,具有良好的發展前景。Abstract:Byoptimizingcompositeinitiator,adjustingprocessandselectingindustrializedequipment,thesolidpolycarboxylateslump-retainingagentPC-702S2wasindustrialpreparedusingbulkpolymerizationwithTPEG,acrylicacidandmaleicanhydrideasmainrawmaterials.Thepolymerconversionrate,molecularweightandmolecularpolydispersity(PDI)wereanalyzedbyGPC,andthemolecularstructureofPC-702S2wasanalyzedbyinfraredspectroscopy.TheresultsshowthattheconversionrateofPC-702S2is94.43%,PDIis1.283,whichcanreachtheperformanceofconventionalaqueoussolutionpolymerizedslumpretainingagent.Theparticlesizeofsolidproductsisn’tmorethan300μm,whichissuitableforindustrializationandpromotion,andhasbigdevelopmentprospects.
    陳國新,祝燁然,杜志芹,等.本體聚合固體聚羧酸系保坍劑的工業化制備及性能研究[J].混凝土與水泥制品,2020(5):21-24. CHEN G X,ZHU Y R,DU Z Q,et al.The Industrial Preparation and Properties of Solid Polycarboxylate Slump Retaining Agent Using the Method of Bulk-polymerization[J].China Concrete and Cement Products,2020(5):21-24.
    預拌混凝土行業用水現狀分析
    預拌混凝土行業用水現狀分析
    • 管 辰1,周繼恒1,魏建勛1,胡志穎1,師海霞2,王建華3,顏小波1,賈 嘉2,袁俁鋮1
    2020年第5期
    摘要
    引用本文
    摘? 要:通過數據調研、實地走訪等方式研究了我國預拌混凝土行業用水情況,并基于水平衡測試結果分析了各生產環節的耗水情況,為開展預拌混凝土行業用水研究以及制定相關標準工作提供參考。 Abstract: Based on data investigation, field visit, etc., water used in ready-mixed concrete industry was analyzed. Combining results of water balance testing, water consumption studies were made through each producing process. With such analysis and studies, foundations were built for further researches in water intake, norms of water intake and standards of water saving enterprises in ready-mixed concrete industry.
    管辰,周繼恒,魏建勛,等.預拌混凝土行業用水現狀分析[J].混凝土與水泥制品,2020(5):25-27. GUAN C,ZHOU J H,WEI J X,et al.Status Analysis of Water Intake in Ready-mixed Concrete Industry[J].China Concrete and Cement Products,2020(5):25-27.
    管芯縱向裂縫對BCCP承載能力影響研究
    管芯縱向裂縫對BCCP承載能力影響研究
    • 孫岳陽1,胡少偉1,2,明 攀1,薛 翔2
    2020年第5期
    摘要
    引用本文
    摘? ?要:為了研究管芯縱向裂縫對BCCP(鋼筋纏繞鋼筒混凝土壓力管)承受內、外壓能力的影響,選取合適的材料本構模型,利用ABAQUS軟件建立了DN1 800 BCCP內、外壓計算模型,在內壓管的鋼筒外管芯和外壓管的管頂鋼筒內管芯處分別設置了1 000 mm、2 000 mm、3 000 mm、4 000 mm的縱向裂縫,將計算結果與完好管進行了對比。結果表明,對于內壓管,外管芯縱向裂縫僅對外管芯達到受拉極限所對應的內壓值產生影響,且該值與縱向裂縫長度無關,均在2.95 MPa左右,比完好管小0.25 MPa;對于外壓管,管頂內管芯縱向裂縫僅對裂縫所在位置處達到受拉極限所對應的外壓值產生影響,同樣與縱向裂縫長度無關,均在1 200 kN左右,比完好管小300 kN;無論是內壓管還是外壓管,保護層、鋼筒和鋼筋達到極限強度時所對應的荷載值都與管芯有無裂縫以及裂縫長度無關。 Abstract: In order to study the effect of longitudinal crack on the capacity of BCCP under internal or external pressure, the finite element software ABAQUS was used to establish two calculation models with the same diameter of 1 800 mm and appropriate material constitutions were selected. The longitudinal cracks of 1 000 mm,? 2 000 mm, 3 000 mm and 4 000 mm in length were arranged in the outer core of BCCP under internal pressure and in the top of the inner core under external pressure. The calculated results were compared with those of the intact pipe. The results show that for the pipe under internal pressure, the longitudinal crack of the outer core only affects the pressure corresponding to the tensile limit of the outer core, and this value is independent of the crack length, which is about 2.95 MPa, and is 0.25 MPa smaller than that of the intact pipe. For the pipe under external pressure, the longitudinal crack in the top of the inner core only affects the pressure corresponding to the tensile limit at the location of the crack, which is also independent of the crack length. The calculation results of loads are all around 1 200 kN, which is 300 kN smaller than that of the intact pipe. Whether BCCP is under internal or external pressure, the loads corresponding to the protective cover, cylinder and steel bar when they reach the ultimate strength are independent of the cracks in core and length of cracks.?
    孫岳陽,胡少偉,明攀,等.管芯縱向裂縫對BCCP承載能力影響研究[J].混凝土與水泥制品,2020(5):28-33. SUN Y Y, HU S W,MING P,et al.Study on the Effect of Longitudinal Crack in Core Pipe on the Bearing Capacity of BCCP[J].China Concrete and Cement Products,2020(5):28-33.
    復合應力下PVA-ECC受扭柱的抗震性能試驗研究
    復合應力下PVA-ECC受扭柱的抗震性能試驗研究
    • 梁 肖1,邵永健1,凌 智1,王國佐2
    2020年第5期
    摘要
    引用本文
    摘?要:通過6根鋼筋加強ECC柱和1根普通混凝土柱在壓-彎-剪-扭復合應力狀態下抗震性能試驗,研究了構件的滯回曲線、骨架曲線、強度退化、剛度退化以及破壞形態,分析了配箍率、縱筋配筋率、纖維摻量對ECC受扭柱抗震性能的影響。試驗結果表明,較普通RC柱,ECC柱的滯回曲線更加飽滿,屈服扭矩、極限扭矩以及極限扭率分別提高了64.4%、74.8%、123.3%;試件的纖維摻量從1%提高到2%,延性系數從2.30增至4.04;隨著配箍率增大,試件受扭性能增強,較于未配置箍筋的試件,箍筋間距為75mm的試件延性系數提高了66.2%,極限扭矩提高了34.0%。Abstract:Basedontheseismicperformancetestof6ECCcolumnsstrengthenedwithsteelbarsandoneordinaryconcretecolumnundertheconditionofcompressionbendingsheartorsioncompositestress,thehystereticcurve,skeletoncurve,strengthdegradation,stiffnessdegradationandfailuremodeofthecomponentwerestudied,andtheinfluenceofstirrupratio,longitudinalreinforcementratioandfibercontentontheseismicperformanceofECCcolumnssubjectedtotorsionwasanalyzed.TheresultsshowthatthehystereticcurveofECCcolumnisfullerthanthatofordinaryRCcolumn,andtheyieldtorque,ultimatetorqueandlimittorsionrateareincreasedby64.4%,74.8%and123.3%respectively.Thefibercontentincreasesfrom1%to2%,theductilitycoefficientincreasesfrom2.30to4.04.Withtheincreaseofstirrupratio,thetorsionalperformanceofspecimenisenhanced.Comparedwiththespecimenwithoutstirrup,theductilitycoefficientandultimatetorqueofspecimenwithstirrupspacingof75mmareincreasedby66.2%and34.0%respectively.
    梁肖,邵永健,凌,智,等.復合應力下PVA-ECC受扭柱的抗震性能試驗研究[J].混凝土與水泥制品,2020(5):34-37. LIANG X,SHAO Y J,LING Z,et al.Experimental Study on Seismic Behavior of PVA-ECC Columns under Composite Stress[J].China Concrete and Cement Products,2020(5):34-37.
    海洋腐蝕環境下鋼筋混凝土梁疲勞試驗研究
    海洋腐蝕環境下鋼筋混凝土梁疲勞試驗研究
    • 張秋悅1,王 暉1,韓文臣2
    2020年第5期
    摘要
    引用本文
    摘?要:對8根鋼筋混凝土梁進行了大氣環境、淡水及海水環境下的疲勞試驗,研究了其力學性能及剛度損傷演化規律。進一步分析了三種環境與循環荷載共同作用下試件梁的破壞形態、撓度發展規律和疲勞壽命。試驗結果表明,腐蝕和疲勞存在耦合作用,海水腐蝕環境與5%~70%荷載水平作用下,梁疲勞壽命最短。根據理論分析和試驗結果,對鋼筋混凝土梁在嚴酷海洋環境下的疲勞壽命及其規律進行了進一步研究,參考已有文獻和試驗研究結果給出了基于鋼筋混凝土梁剛度損傷演化規律的疲勞壽命預測模型,經計算,實測結果與該預測模型計算結果之間的誤差不超過13%。Abstract:Thefatiguetestsofeightreinforcedconcretebeamsunderatmospheric,freshwaterandseawaterconditionswerecarriedouttostudythemechanicalpropertiesandstiffnessdamageevolutionofreinforcedconcretebeams.Furtheranalyzethefailuremode,deflectiondevelopmentlawandfatiguelifeofthespecimenbeamundertheinteractionofthreeenvironmentsandcyclicloads.Thetestresultsshowthatthereiscouplingbetweencorrosionandfatigue.Undertheactionofseawatercorrosionenvironmentand5%~70%loadlevel,thefatiguelifeofthebeamistheshortest.Accordingtothetheoreticalanalysisandexperimentalresults,thefatiguelifeanditsregularityofreinforcedconcretebeamsunderseveremarineenvironmentarefurtherstudied.Referringtotheexistingliteratureandexperimentalresearchresults,thefatiguelifepredictionmodelbasedonthestiffnessdamageevolutionlawofreinforcedconcretebeamsisgiven.Aftercalculation,theerrorbetweenthemeasuredresultsandthecalculatedresultsofthepredictivemodeldoesnotexceed13%.
    張秋悅,王暉,韓文臣.海洋腐蝕環境下鋼筋混凝土梁疲勞試驗研究[J].混凝土與水泥制品,2020(5):38-41. ZHANG Q Y,WANG H, HAN W C.Experimental Study on Fatigue Behavior of Reinforced Concrete Beams under Marine Corrosion Environment[J].China Concrete and Cement Products,2020(5):38-41.
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