第六期_2020_《混凝土與水泥制品》雜志社

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第六期

基于分形理論的水泥砂漿強度預測模型

金珊珊1,2，楊金龍1,2，索智1,2，楊柯南1,2

2020年第6期

摘要

引用本文

摘?要：測試了多組配合比砂漿不同齡期的強度及孔隙結構，引入基于熱力學關系的分形模型計算得到了砂漿的孔表面積分形維數。利用統計學方法，探討了孔隙量參數和孔徑分布參數與砂漿抗壓強度的定量關系，建立了同時考慮孔隙量和孔徑分布的強度預測模型，采用該模型對多組配合比混凝土的抗壓強度進行預測。結果表明，預測強度接近室內試驗實測強度。Abstract:Thestrengthandporestructureofcementmortarwithdifferentproportionsatdifferentagesweremeasured.Thefractalmodelbasedonthethermodynamicrelationshipwasintroducedtocalculatetheporesurfacefractaldimensionofthecementmortar,whichcouldbeusedasoneofthecharacteristicparametersoftheporesizedistribution.Thequantitativerelationshipsbetweenthecompressivestrengthandtheporevolumeparametersandtheporesizedistributionparameterswerediscussedbystatisticalmethod.Thestrengthpredictionmodelwithconsiderationofbothporevolumeandporesizedistributionwaspresented.Thestrengthofconcretewithdifferentproportionswascalculatedbythestrengthpredictionmodel.Theresultsshowthecalculationstrengthapproachestothetestedstrength.Thestrengthpredictionmodelproposedinthisresearchcanbeappliedintheassessmentofthematerialstrengthofexistingconcretestructure.

金珊珊,楊金龍,索智,等.基于分形理論的水泥砂漿強度預測模型[J].混凝土與水泥制品,2020(6):1-5,12. JIN S S,YANG J L,SUO Z,et al.The Strength Prediction Model of Cement Mortar Based on Fractal Theory[J].China Concrete and Cement Products,2020(6):1-5,12.

仿火山渣裝飾效果的輕質多孔混凝土制備與性能研究

張磊蕾1,2，劉洪彬3，王武祥1,2，王愛軍1，廖禮平1

2020年第6期

摘要

引用本文

摘?要：通過控制調孔劑、粉煤灰摻量來調整相關輕質多孔混凝土的氣孔孔徑大小和孔徑分布，使其具有仿火山渣的裝飾效果?；诳箟簭姸群脱b飾效果的要求，提出了A08級仿火山渣輕質多孔裝飾混凝土的適宜配合比。試驗結果表明，按此配合比制備的輕質多孔裝飾混凝土不但具有良好的仿火山渣裝飾效果，同時具有良好的物理力學性能，多孔混凝土的密度等級為A08級，強度等級達到A5.0級。Abstract:Theporesizeandporedistributionoflightweightporousconcretecanbechangedbyadjustingagentandflyashcontent.Basedonthecompressivestrengthanddecorationeffectrequirements,thesuitablemixingratioofA08gradelightweightporousconcretewithimitationvolcanicslagdecorationwasproposed.Theresultsshowthelightweightporousdecorativeconcrete,accordingtothemixingratio,notonlyhasthegoodimitationvolcanicslagdecoration,butalsohasgoodphysicalandmechanicalproperties.Thedensitygrade,compressivestrengthgradecanreachA08,A5.0respectively.

張磊蕾,劉洪彬,王武祥,等.仿火山渣裝飾效果的輕質多孔混凝土制備與性能研究[J]混凝土與水泥制品,2020(6):6-8. ZHANG L L,LIU H B,WANG W X,et al.Research on the Preparation and Properties of Lightweight Porous Concrete with Volcanic Slag Imitation[J].China Concrete and Cement Products,2020(6):6-8.

納米CaCO3對混凝土抗沖磨性能影響試驗研究

田競1,2，蘇駿1，吳鵬1,2，何真2，蔡新華2

2020年第6期

摘要

引用本文

摘?要：試驗研究了不同摻量納米CaCO3對混凝土力學性能和抗沖磨性能的影響，并通過水化熱測試方法研究了納米CaCO3對混凝土性能影響的機理。試驗結果表明，適量的納米CaCO3可以提升混凝土的力學性能，提高混凝土的抗壓強度、劈裂抗拉強度和抗沖磨性能。當納米CaCO3的摻量為1.5%時，混凝土抗沖磨強度提高約6倍；納米CaCO3促進了水泥的水化反應，改善了水泥漿體微觀結構，提升了整體的密實性。Abstract:TheeffectsofNano-CaCO3withdifferentcontentonthemechanicalpropertiesandabrasionresistanceofconcretewereinvestigatedexperimentally.TheinfluencemechanismofNano-CaCO3onconcretewasstudiedbyhydrationheattest.TheexperimentalresultsshowthatappropriateamountofNano-CaCO3(notexceed1.5%)canimprovethemechanicalpropertiesofconcrete,suchasthecompressivestrength,splittingtensilestrengthandabrasionresistanceofconcrete.Thecompressivestrengthofconcretewith1.5%Nano-CaCO3isabout6timesthantheonewithoutNano-CaCO3.TheresultsrevealthatNano-CaCO3promotehydrationreaction,acceleratehydrationheatreleaserate,refinethemicrostructureofcementpaste,andenhancetheoverallcompactness.

田競,蘇駿,吳鵬,等.納米CaCO3對混凝土抗沖磨性能影響試驗研究[J]混凝土與水泥制品,2020(6):9-12. TIAN J,SU J,WU P,et al.Experimental Research on Abrasion Resistance of Concrete Mixed with Nano-CaCO3[J].China Concrete and Cement Products,2020(6):9-12.

壓剪共同作用下混凝土的動態力學性能研究

孫尚鵬，彭剛，程卓群，劉苗苗，王普

2020年第6期

摘要

引用本文

摘?要：為了研究混凝土在壓剪復合狀態下的動態力學性能，采用大型多功能動靜力三軸儀進行了5種不同應變速率和5種不同法向應力下的壓剪復合受力狀態的剪切試驗。分析其剪切強度變化規律，構建了基于八面體應力空間二次形式破環準則，轉換為正應力與剪應力表示的壓剪破環準則形式。結果表明，隨著應變速率增加，混凝土的抗剪強度呈增大趨勢，而隨法向應力的增加，混凝土抗剪強度則呈現出先增大后減小的趨勢；基于八面體應力空間二次形式破環準則，建立了考慮速率效應的混凝土壓剪破環準則，通過試驗數據對比得出該破環準則與試驗數據吻合較好。Abstract:Inordertostudythedynamicmechanicalpropertiesofconcreteundercompression-shearcombinedstate,fivesheartestsunderfivedifferentstrainratesandfivedifferentnormalstresseswerecarriedoutusingalargemulti-functionaldynamic-statictriaxialapparatus.Thechangeruleofshearstrengthwasanalyzed,andaquadraticcriterionofringbreakingbasedonoctahedralstressspacewasconstructed.Thecriterionwastransformedintoacompression-shearringbreakingcriterionexpressedbynormalstressandshearstress.Theresultsshowthatwiththeincreaseofstrain,theshearstrengthofconcretetendstoincrease,whilewiththeincreaseofnormalpressure,theshearstrengthofconcretetendstoincreasefirstandthendecrease.Basedontheoctahedralstressspacequadraticformcriterion,thecompression-shearcriterionofconcreteconsideringtherateeffectisestablished.Bycomparingthetestdata,thecriterionisingoodagreementwiththetestdata.

孫尚鵬,彭剛,程卓群,等.壓剪共同作用下混凝土的動態力學性能研究[J]混凝土與水泥制品,2020(6):13-16,21. SUN S P,PENG G,CHENG Z Q,et al.Dynamic Mechanical Properties of Concrete under the Combined Action of Compression and Shear[J].China Concrete and Cement Products,2020(6):13-16,21.

風積沙混凝土與鋼筋的黏結性能試驗研究

張澤平1，王堯鴻1,2，楚奇1，馬小彥1

2020年第6期

摘要

引用本文

摘?要：為研究風積沙混凝土與鋼筋之間的黏結性能，制作了28個試塊進行中心拉拔試驗，研究了風積沙摻量、鋼筋形狀、鋼筋直徑和齡期對黏結性能的影響規律，并基于試驗結果擬合出風積沙混凝土與帶肋鋼筋之間的黏結強度-滑移本構關系曲線。研究結果表明，風積沙摻量小于30%時，極限黏結強度隨著風積沙摻量、鋼筋直徑、齡期的提高而提高；風積沙摻量分別為10%、20%和30%時，帶肋鋼筋對應的極限黏結強度分別比光圓鋼筋提高了61.2%、58.5%、56.1%。Abstract:Inordertostudythebondbehaviorbetweenaeoliansandconcreteandsteelbars,28aeoliansandconcretespecimensweremadeforcentralpull-outtests.Theeffectsofaeoliansandcontent,shapeofsteelbars,diameterofsteelbarsandcuringageonthebondbehaviorbetweenaeoliansandconcreteandsteelbarswerestudied.Besides,thebondstrength-slipconstitutiverelationshipcurvebetweenaeoliansandconcreteandribbedbarswasfittedbasedonthetestresults.Theresultsshowthattheultimatebondstrengthincreaseswiththeincreaseoftheaeoliansandcontent,diameterofsteelbarsandcuringagewhentheaeoliansandcontentislessthan30%.Whentheaeoliansandcontentis10%,20%and30%,theultimatebondstrengthofribbedbarsis61.2%,58.5%and56.1%higherthanthoseofplainroundbarsrespectively.

張澤平,王堯鴻,楚奇,等.風積沙混凝土與鋼筋的黏結性能試驗研究[J]混凝土與水泥制品,2020(6):17-21. ZHANG Z P,WANG Y H,CHU Q,et al.Experimental Study on Bond Behavior Between Aeolian Sand Concrete and Reinforcing Bars[J].China Concrete and Cement Products,2020(6):17-21.

基于Torrent法的混凝土滲透性研究

余韜，李天艷，竇妍，葛曉麗

2020年第6期

摘要

引用本文

摘?要：利用Torrent法研究了礦物摻合料、強度等級、含水率等因素對混凝土空氣滲透系數的影響，并結合混凝土氯離子擴散系數和電通量的試驗結果，分析了利用空氣滲透系數來表征混凝土滲透性的可行性。試驗結果表明，混凝土強度等級越高，密實度越好，空氣滲透系數越??；空氣滲透系數隨混凝土含水率的降低而增大，變化呈現指數遞增的關系；空氣滲透系數與氯離子擴散系數和電通量有良好的相關性。Abstract:Theinfluenceofmineraladmixture,strengthgrade,moisturecontentonconcreteairpermeabilitycoefficientwasstudiedbyTorrentmethod.Combinedwiththeexperimentalresultsofconcretechlorideiondiffusioncoefficientandelectricfluxofconcrete,thefeasibilityofusingTorrentmethodcoefficienttocharacterizeconcretepermeabilitywasanalyzed.Theresultsshowthatthehighertheconcretestrengthgrade,thebetterthecompactness,andtheairpermeabilitycoefficientissmaller.Theairpermeabilitycoefficientincreaseswiththedecreaseofwatercontentofconcrete,andthechangeshowsapowerexponentialrelationship.Theairpermeabilitycoefficienthasagoodcorrelationwithchloridediffusioncoefficientandelectricflux.

余韜,李天艷,竇妍,等.基于Torrent法的混凝土滲透性研究[J]混凝土與水泥制品,2020(6):22-25. YU T,LI T Y,DOU Y,et al.Study on Permeability of Concrete Based on Torrent Method[J].China Concrete and Cement Products,2020(6):22-25.

3D打印建筑用材料研究、典型應用及趨勢展望

文俊1，蔣友寶2，胡佳鑫2，肖楊2

2020年第6期

摘要

引用本文

摘?要：敘述了3D打印建筑材料的研究進展，介紹了3D打印技術在建筑領域中的典型應用。提出了需進一步加強打印材料的研發，改進打印設備及打印工藝，建立適合3D打印的結構設計體系和3D打印建筑質量標準體系。Abstract:Theresearchonmaterialsfor3Dprintingbuildingswasreviewed.Thetypicalapplicationsinthebuildingsusing3Dprintingprocesswereintroduced.Andthepointsareputforwardthatit′snecessarytofurtherstudyprintingmaterials,improveprintingequipmentandprintingprocess,establishasuitablestructuraldesignsystemand3Dprintingbuildingqualitystandardsystemfor3Dprinting.

文俊,蔣友寶,胡佳鑫,等.3D打印建筑用材料研究、典型應用及趨勢展望[J]混凝土與水泥制品,2020(6):26-29. WEN J,JIANG Y B,HU J X,et al.Research on Materials, Typical Applications and Development Trends of 3D Printing Buildings[J].China Concrete and Cement Products,2020(6):26-29.

對現階段我國預制混凝土樁行業發展的幾點思考

蔣元海

2020年第6期

摘要

引用本文

摘?要：結合多年從業經驗，闡述了現階段我國預制混凝土樁產品種類、生產企業分布、技術裝備和應用情況，分析了我國預制混凝土樁行業目前存在的主要問題，如機械化水平不高、工業化和信息化融合水平較低、產品多樣性不足、安全生產及綠色環保理念落后、產品應用領域較窄等，并結合我國政策要求、技術水平、行業發展對預制混凝土樁行業的可持續發展進行了展望，為預制混凝土樁行業的可持續發展提供借鑒。Abstract:Basedonmanyyearsofindustryexperience,thetypes,distributionofproductionenterprises,technicalequipmentofprecastconcreteproductsandtheapplicationinChinaatpresentareintroduced,andthecurrentmainproblemsexistingintheprecastpileindustryinChinaareanalyzed,suchaslowlevelofmechanization,lowlevelofintegrationofindustrializationandinformationtechnology,insufficientproductdiversity,laggingideaofsafetyproductionandgreenenvironmentalprotection,andnarrowapplicationfieldofproducts.Inaddition,inaccordancewiththepolicyrequirements,technicallevelandindustrydevelopmentofChina,thecorrespondingoutlookforthesustainabledevelopmentofprecastconcretepileindustryinChinaisputforwardinordertoprovideadviceandguidanceforthesustainabledevelopmentoftheprecastconcretepileindustry.

蔣元海.對現階段我國預制混凝土樁行業發展的幾點思考[J]混凝土與水泥制品,2020(6):30-33,40. JIANG Y H.Thoughts on the Development of Precast Concrete Pile Industry in China[J].China Concrete and Cement Products,2020(6):30-33,40.

鋼筋ECC柱復合抗扭性能試驗研究

傅少華1，邵永健1，凌智1，王國佐2

2020年第6期

摘要

引用本文

摘?要：通過5個鋼筋ECC柱和1個鋼筋混凝土柱在壓-彎-剪-扭復合應力狀態下的單調受扭試驗，研究了構件的破壞形態、延性系數、扭矩-扭率（T-θ）曲線，分析了纖維摻量、縱筋配筋率、箍筋間距對鋼筋ECC柱受扭性能的影響。試驗結果表明，在復合受扭作用下，6個試件均為受扭破壞，其中5個鋼筋ECC柱的裂縫細而密；增加纖維和減少箍筋間距可以提高試件延性，摻入PVA纖維的試件延性明顯優于普通鋼筋混凝土柱；5個鋼筋ECC柱的扭矩-扭率（T-θ）曲線更為飽滿，破壞階段扭矩下降緩慢，受扭承載力高。Abstract:Throughthemonotonoustwistingtestof5reinforcedECCcolumnsand1reinforcedconcretecolumnunderpressure-bend-shear-twistingcompoundstress,thedestructiveform,ductioncoefficient,torqueT-θratioofthecomponentswerestudied,andtheinfluenceoffiberdoping,ribbandingrateandhoopspacingonthetwistingperformanceoftherebarECCcolumnwasanalyzed.Thetestresultsshowthatunderthecompoundtwistingaction,6testpiecesaretwistedanddestroyed,and5ofthemreinforcedECCcolumnshavefineanddensecracks.Increasingfiberandreducingthespacingofthehoopscanimprovetheelongationofthetestpiece,andtheductilityofthePVAfibertestpieceisobviouslybetterthanthatoftheordinaryreinforcedconcretecolumn.ThetorqueT-twistingcurveofthe5rebarECCcolumnsisfullerandhasahighcarryingcapacity,resultinginaslowdropintorqueduringthedestructionphase.

傅少華,邵永健,凌智,等.鋼筋ECC柱復合抗扭性能試驗研究[J]混凝土與水泥制品,2020(6):34-36. FU S H,SHAO Y J,LING Z,et al.Experimental Study on Torsional Properties of Reinforced ECC Columns[J].China Concrete and Cement Products,2020(6):34-36.

白色清水預制混凝土構件制作要點

竹乃杰

2020年第6期

摘要

引用本文

摘?要：介紹了白色清水預制混凝土構件（PC構件）的原材料選用、配合比設計、構件制作要點和脫模制度，研究了成品保護及破損修補方法，實現了對白色清水PC構件制作、儲運、修補全過程外觀質量的有效控制。Abstract:Thekeyproductiontechnologyofthewhiteprefabricatedconcretecomponentsisintroducedastheselectionofrawmaterials,thedeterminationofmixproportion，themethodofmakingcomponentsanddemouldingprocedure,andtheprotectionofthefinishedproductsandthemethodsofrepairingthedamagearestudied.Theapparentqualitycontrolmethodsintheprocessofmaking,storageandtransportationofwhiteprefabricatedconcretecomponentsarerealized.

竹乃杰.白色清水預制混凝土構件制作要點[J]混凝土與水泥制品,2020(6):37-40. ZHU N J.Key Factors of White Precast Concrete Components Production[J].China Concrete and Cement Products,2020(6):37-40.

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