第五期_2018_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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第五期

粉煤灰对再生砖砌体骨料混凝土干燥收缩性能的影响

李显1,2，李飞2，陆加越1，王福晋2，周理安2

2018年第5期

摘要

引用本文

摘 Abstract:Recycledbrickmasonryaggregateconcrete(RBMAC)ofrecycledbrickmasonryhastheproblemoflargeshrinkageandshrinkagedeformation.Takingthesubstitutionrateofflyash(0,25%,50%)andthevolumereplacementrateofrecycledbrickmasonryaggregate(0,50%,100%)asvariables,theinfluenceofflyashontheshrinkageperformanceofRBMACisstudied,andtheruleispredicted.TheresultsshowthattheadditionofflyashisakindofRBMACtechniquethatcaneffectivelysolvetheshrinkage,mixedwith50%flyashcanmakethedryingshrinkageofRBMACdecreasedbyabout40%,evenlessthanthe8%ofthenaturalaggregateconcretewithoutflyash.Thenitrogenadsorptiontestfurthershowedthatcaneffectivelyrefinetheinnerholestructureofthespecimenandreducetheproportionofthepores,thusinhibitthedryingshrinkageofRBMAC.CombinedwiththeshrinkagemechanismofhighvolumeflyashRBMAC,themodifiedpredictionformulaofthedryingshrinkageoftheRBMACconcretewithflyashisobtained.要：再生砖砌体骨料混凝土（recycledbrickmasonryaggregateconcrete,RBMAC）存在干燥收缩变形大的问题。本文以粉煤灰质量取代率（0、25%、50%）和再生砖砌体骨料体积取代率（0、50%、100%）为变量，研究粉煤灰对RBMAC收缩性能的影响并预测其规律。结果表明，粉煤灰的掺加是一种可以有效解决RBMAC收缩较大问题的技术途径，掺加50%粉煤灰可使RBMAC干燥收缩降低约40%，甚至比未掺加粉煤灰的天然骨料混凝土相比还减小约8%；氮吸附试验进一步说明，粉煤灰的掺加有效细化了试样的内部孔结构，减小了毛细孔的比例，从而一定程度上抑制了RBMAC的干燥收缩；结合大掺量粉煤灰RBMAC的收缩机理，得出了考虑粉煤灰掺量的RBMAC干燥收缩修正预测公式。

李显,李飞,陆加越,等.粉煤灰对再生砖砌体骨料混凝土干燥收缩性能的影响[J].混凝土与水泥制品,2018(5):96-100. LI X,LI F,LU J Y,et al.Influence of Fly Ash on the Drying Shrinkage Performance of Recyled Brick Masonry Aggregate Concrete[J].China Concrete and Cement Products,2018(5):96-100.

废弃黏土砖轻骨料混凝土的力学性能研究

赵亚松1,2，高建明1,2

2018年第5期

摘要

引用本文

摘要：使用废弃黏土砖作为粗、细骨料制备轻骨料混凝土，探究了水胶比、体积砂率与粉煤灰掺量对力学性能的影响，并建立了各力学性能之间的换算关系。结果表明，黏土砖轻骨料混凝土的干表观密度在1700～1840kg/m3之间，抗压强度高达40MPa。水胶比的降低能够提升黏土砖轻骨料混凝土的力学性能，粉煤灰的掺加对前28d力学性能存在不利影响，而体积砂率对力学性能的影响较小；建立了抗折强度、轴心抗压强度、静弹性模量与抗压强度之间的换算关系，分析了黏土砖轻骨料混凝应力应变曲线，并采用分段三次函数对曲线进行了拟合。Abstract:Thelightweightaggregateconcreteispreparedbyusingwasteclaybricksascoarseandfineaggregates.Theeffectsofwater-binderratio,volumesandratioandflyashcontentonmechanicalpropertiesoftheconcreteisstudied,andtheconversionrelationshipsbetweenvariousmechanicalpropertiesareestablished.Theresultsshowthatthedryapparentdensityoflightweightaggregateconcretewithwasteclaybricksasaggregatesis1700～1840kg/m3,andthecompressivestrengthcanreachto40MPa.Themechanicalpropertiescouldbeimprovedbyreducingwater-binderratio,andtheadditionofflyashhasthenegativeeffectonmechanicalpropertiesbefore28d.Theimpactofthevolumesandratioonmechanicalpropertiesislittle.Theconversionrelationshipsbetweenflexuralstrength,axialcompressivestrength,staticmodulusofelasticityandcompressivestrengthareestablished.Meanwhile,thestress-straincurveisanalyzedandfittedbysegmentedcubicfunction.

赵亚松,高建明.废弃黏土砖轻骨料混凝土的力学性能研究[J].混凝土与水泥制品,2018(5):91-95. ZHAO Y S,GAO J M.Study on the Mechanical Properties of Light-weight concrete with Waste Clay Bricks as Aggregates[J].China Concrete and Cement Products,2018(5):91-95.

双向搅拌粉喷桩技术在铁路软基加固中的应用

魏洪山

2018年第5期

摘要

引用本文

摘要：在给出双向搅拌粉喷技术原理及施工工艺的基础上，依托连盐铁路试验段工程，对双向搅拌粉喷桩成桩质量进行了评价，研究表明，选用水泥掺入量为17%、搅拌转速为40r/min的双向搅拌粉喷桩施工工艺可以满足工程需要。双向搅拌粉喷技术能明显改善成桩偏差质量，成桩均匀性和质量均好于常规粉喷桩，无侧限抗压强度提高且离散性降低。现场双向搅拌粉喷桩水泥土强度约为相应室内水泥土配合比强度的0.4～0.5倍Abstract:Basedontheprincipleandconstructiontechnologyofthebidirectionalmixingpowderspraying,combinedwiththeLianyungang-YanchengRailway,thequalityofthebidirectionalmixingDJMpileisevaluated.Theresultsshowthat17%cementmixing,40r/minstirringspeedofBidirectionalmixingDJMpilecanmeettheengineeringneed;Thebidirectionalmixingpowdersprayingtechnologycanobviouslyimprovethepiledeviationquality,thepileuniformityandthequalityarebetterthantheconventionalpowderinjectionpile,theunconfinedcompressivestrengthcanbeimprovedandthedispersioncanbereduced.Thesoilstrengthofthebidirectionalmixingpowdersinthefieldis0.4~0.5timesofthestrengthoftheindoorcement.

魏洪山.双向搅拌粉喷桩技术在铁路软基加固中的应用[J].混凝土与水泥制品,2018(5):87-90. WEI H S.Application of Bidirectional Mixing DJM Piles in the Reinforcement of Railway Soft Foundation[J].China Concrete and Cement Products,2018(5):87-90.

无机轻集料砂浆保温系统中抗裂砂浆检测方法的正交试验研究

梁晓晖，龚燕华，崔建生

2018年第5期

摘要

引用本文

摘要：针对JGJ253—2011《无机轻集料砂浆保温系统技术规程》中涉及抗裂砂浆检测方法存在的一些不明确之处，通过正交试验分析研究检测过程中搅拌方式、涂抹厚度、拆型框时机和覆膜方式等因素对抗裂砂浆性能的影响程度，优化原有检测方法，并提出相应的建议，以确保无机轻集料保温系统中抗裂砂浆检测工作正常、有序、高效的开展。Abstract:AccordingtoJGJ253—2011Technicalspecificationforthermalinsulatingsystemsofinorganiclightweightaggregatemortar,theanti-crackmortardetectionmethodhassomenotclearplace.Throughtheorthogonalexperimentanalysis,thevariousfactorsthatinfluencingtheanti-crackmortarperformancetestingprocess,suchasmixingway,daubthickness,opentimeandthewayofaddingplasticfilmarestudied.Then,theoriginaldetectionmethodisoptimizedandthecorrespondingsuggestionisputforwardtoensurethattheorderlyandefficientoftheanti-crackmortarinthermalinsulatingsystemsofinorganiclightweightaggregatemortartest.

梁晓晖,龚燕华,崔建生.无机轻集料砂浆保温系统中抗裂砂浆检测方法的正交试验研究[J].混凝土与水泥制品,2018(5):82-86. LIANG X H,GONG Y H,CUI J S.Orthogonal Test Study on the Detection Methods of Grack Resistant Mortar in Inorganic Light-weight Mortar Insulation System[J].China Concrete and Cement Products,2018(5):82-86.

利用入模温差检测钢管混凝土密实性试验研究

杨鸿玉1，刘卫东1，危鼎2，王桂玲2，沈健2

2018年第5期

摘要

引用本文

摘要：基于红外热成像技术，利用混凝土入模温差，对检测钢管混凝土密实性进行试验研究。利用水代替混凝土作为入模材料，分别在入模温差为15℃、8℃、5℃情况下对不同大小缺陷进行检测。利用ANSYS有限元分析软件，对水和混凝土不同入模温差下钢管横截面温差进行对比分析。结果表明，利用混凝土入模温差可以清晰的辨别出10cm×10cm，厚1cm的大缺陷，而对于5cm×5cm，厚1cm的小缺陷可在最初时刻观测到，但边界相对模糊。Abstract:Basedonthermalimagingtechnologyandthetemperaturedifferencebetweentheconcreteandthemold,theexperimentalstudyonthecompactnessofthesteeltubeconcreteiscarriedout.Byusingwaterinsteadofconcreteasthemoldingmaterial,differentsizedefectsofconcretearedetectedundertheconditionofthemoldtemperaturedifferenceof15℃,8℃,5℃.ByusingthefiniteelementanalysissoftwareANSYS,thetemperaturedifferenceofthecrosssectionofthesteelpipeundermoldtemperaturedifferencebetweenwaterandconcreteisanalyzed,theresultsshowthatusingthemoldtemperaturedifferenceoftheconcretecanclearlyidentifythe10cm×10cm,thick1cmoflargedefects,andfor5cm×5cm,smalldefectsinthick1cmcanbeobservedatthebeginning,buttheborderisrelativelyvague.

杨鸿玉,刘卫东,危鼎,等.利用入模温差检测钢管混凝土密实性试验研究[J].混凝土与水泥制品,2018(5):78-81. YANG H Y,LIU W D,WEI D,et al.Study on the Detection of the Compactness of Concrete Filled Steel Tube with Model Temperature Difference[J].China Concrete and Cement Products,2018(5):78-81.

核电工程混凝土原材料中美标准对比研究

勾鸿量1，管玉峰2，程书剑1

2018年第5期

摘要

引用本文

摘要：混凝土的质量与核电厂结构的安全关系重大，因此，各国对混凝土原材料都有着严格要求并制定了相应的标准。随着我国核电的高速发展，在核电技术引进来和走出去的过程中，标准规范方面的差异是工程技术人员必须面对的重要问题之一。本文对国标和美国标准ASTM关于混凝土原材料的指标进行了较为全面详细的对比，包括水泥、骨料、粉煤灰等主要技术参数。通过对比分析，可以为混凝土工程的设计施工人员提供参考，也可以为核电工程用混凝土原材料的选择和确定提供一定的依据。Abstract: Intheconstructionofnuclearpowerstation,thequalityofconcreteisrelatedtothestructuralsafetysignificantly.Asaresult,therequirementsofrawmaterialofconcreteintheregulationspublishedbymanycountriesareverystrict.Astherapiddevelopmentofnuclearengineering,civilengineersmustfacetheproblemsrelatedtothedifferencesofconcretespecifications.TherequirementsofconcreterawmaterialsarecomparedcomprehensivelybasedontheGBCodeandASTMregulations,includingthecomparisonsofcement,aggregate,flyashandsooninordertoprovidesomesuggestionstothecivilengineers.Theresultofthispapercouldalsobereferencedindeterminationofconcretematerialusedinnuclearengineering.

勾鸿量,管玉峰,程书剑.核电工程混凝土原材料中美标准对比研究[J].混凝土与水泥制品,2018(5):73-77. GUO H L,GUAN Y F,CHENG S J.Comparison of Concrete Raw Materiale in Nuclear Engineering Based on China National Standards (GB) and ASTM[J].China Concrete and Cement Products,2018(5):73-77.

石膏矿渣水泥基厚型钢结构防火保温一体化涂料的研究

郭李琴，邓跃全，田晗旭，汪彬彬，李光华，李霞，胡豪，王姚

2018年第5期

摘要

引用本文

摘要：以石膏矿渣水泥作为胶凝材料、膨胀蛭石作为防火保温填料、配以助剂制得厚型钢结构防火保温涂料，测定其耐火温度、干密度、抗开裂性及抗压强度。试验结果表明，当水泥含量为5.0%，石膏矿渣含量为6.5%，胶粉含量为1.35%，膨胀蛭石含量为15%，羟丙基甲基纤维素醚含量为0.2%，硅酸铝纤维含量为1%，平衡温度为380℃，导热系数为0.070W/（m·K），干密度为385kg/m3，抗压强度为0.65MPa时，获得了一种石膏矿渣水泥基厚型钢结构防火保温一体化涂料，工艺简单、成本低，有较好的应用前景。Abstract:Thethicksteelstructurefireproofingandheatinsulationcoatingispreparedbycementingmaterial(oulopholite,mineralwasteresidueandcement),filler(expandedvermiculite)andassistant,andtherefractorytemperature,drydensity,crackresistanceandcompressivestrengtharetested.Theresultshowthatwhentheconditionsis5.0%cement,6.5%oulopholiteandmineralwasteresidue,1.35%rubberpowder,15%expandedvermiculite,0.2%HPMC,1%aluminasilicatefibre,equilibriumtemperatureof380℃,thermalconductivityof0.070W/(m·K),drydensityof385kg/m3,andthecompressivestrengthof0.65MPa,athicksteelstructurefireproofingandheatinsulationcoating,withsimpleprocess,lowcostandgoodapplicationprospectcanbeprepared.

郭李琴,邓跃全,田晗旭,等.石膏矿渣水泥基厚型钢结构防火保温一体化涂料的研究[J].混凝土与水泥制品,2018(5):68-72. GUO L Q,DENG Y Q,TIAN H X,et al.Study on the Thick Steel Structure Fireproofing and Heat Insulation Coating Based on Oulopholist, Mineral Waster Residue and Cement[J].China Concrete and Cement Products,2018(5):68-72.

隔震技术在框架结构轻钢加层工程中的应用

孙慎1，邓敦敦2，李鹏2，陈道政1

2018年第5期

摘要

引用本文

摘要：在城市土地资源日趋紧张的背景下，既有建筑的加层改造成为扩大使用面积的良好手段，利用隔震技术对加层后建筑进行加固是行之有效的先进技术。本文以某框架结构医院门诊楼轻钢加层工程为例，利用SAP2000，建立了隔震前后的有限元分析模型。通过模态分析与动力时程分析得到结构在设防地震、罕遇地震作用下的地震响应。通过比较和分析，采用隔震方案后，结构的地震响应明显降低，提高了结构的抗震性能。Abstract:Underthebackgroundoftheincreasinglytightlandresourcesinurbanarea,theaddedlayerstransformationofexistingbuildingsisagoodwaytoexpandtheareaofuse,andtheuseofseismicisolationtechnologytoreinforcethebuildingsaftertheadditionisaneffectiveandadvancedtechnology.Basedontheexampleoftheframehospitalclinicbuildinglightsteeladdinglayersproject,usingSAP2000,theisolationfiniteelementanalysismodelisestablished.Throughthemodalanalysisanddynamictimehistoryanalysis,theseismicresponseofstructuresisobtainedunderfortifiedearthquakesandrareearthquakes.Bycomparisonandanalysis,theseismicresponseofthestructureisobviouslyreducedafteradoptingtheisolationscheme,sotheseismicperformanceofthestructureisimproved.

孙慎,邓敦敦,李鹏,等.隔震技术在框架结构轻钢加层工程中的应用[J].混凝土与水泥制品,2018(5):63-67. SUN S,GUO D D,LI P,et al.Application of Seismic Isolation Technology in Light Steel Adding Layers with Frame Structure[J].China Concrete and Cement Products,2018(5):63-67.

高钛矿渣膨珠制备轻集料砂浆空心砌块研究

罗凯1,2，李军1，卢忠远1，蒋俊1,2，白媛1,2，赵杰3

2018年第5期

摘要

引用本文

摘要：以水淬高钛矿渣膨珠为轻骨料，普通硅酸盐水泥为胶凝材料，脱硫石膏为激发剂，采用压制成型工艺制备了轻集料砂浆，研究了高钛矿渣膨珠、水泥、脱硫石膏掺量和对轻集料砂浆力学性能和干密度的影响，利用X射线衍射（XRD）、扫描电镜（SEM）手段对轻质砂浆矿物结构和微观形貌进行了表征。此外，以优选的轻质砂浆为基体，工厂试制了轻质砂浆小型空心砌块。结果表明：轻质砂浆力学性能和干密度随水泥用量增加而升高；随脱硫石膏用量增加，轻集料砂浆抗压强度先增加后降低，干密度变化不大。固定胶凝材料用量18%、脱硫石膏替代水泥20%条件下，所制备轻集料砂浆抗压强度16.0MPa，干密度1789kg/m3，以该轻骨料砂浆为基体材料进行轻集料砂浆小型空心砌块试制，可制备出抗压强度9.6MPa，干密度1223kg/m3，MU7.5的空心砌块。Abstract:Thelight-weightmortarismadebyusinggranulatedblasttitaniumslagasaggregate,ordinaryportlandcementascementingmaterial,desulfurizedgypsumasactivator,frompressmouldingandcombinedwithXRDandSEM,theeffectofcementcontentandactivatorcontentonthecopressivestrengthanddrydensityoflight-weightmortarareinvestigated.Onthebasisofthis,theactualproductionofconcretehollowblockiscarriedout.Theresultsshowthatthecompressivestrengthanddrydensitybecomestrongerasthecementcontentincreases.ThechangeofW/Chadalittleeffectonthedrydensityoflight-weightmortar,thecompressivestrengthincreasesatfirstandthendecreaseswhenactivatorincreasedfrom0.5to0.8.Andthematrixmaterial’scompressivestrengthis16.0MPa,drydensityis1789kg/m3,thelight-weightmortarsmallhollowblocks’compressivestrengthis9.6MPa,drydensityis1223kg/m3anditisfeasibletomeettherequirementsofMU7.5.

罗凯,李军,卢忠远,等.高钛矿渣膨珠制备轻集料砂浆空心砌块研究[J].混凝土与水泥制品,2018(5):58-62. LUO K,LI J,LU Z Y,et al.Study on the Preparation of Light-weight Mortar Hollow Blocks with Granulated Blast Titanium Slag[J].China Concrete and Cement Products,2018(5):58-62.

基于磁探针电感检测法检测UHPFRC中纤维的空间分布

李路帆1，夏骏1，濮琦2

2018年第5期

摘要

引用本文

摘要：研究了超高性能纤维混凝土（UHPFRC）中纤维不均匀分布对材料性质的影响，基于使用的钢纤维的磁感效应，无损的磁探针电感检测法可以检测超高性能混凝土构件中钢纤维的二维平面以及三维空间分布。将这种无损检测方法应用于超高性能混凝土棱柱体试样，通过放置磁性探针在棱镜的侧表面，也即抗弯测试中的顶部和底部表面来测量电感，从而得到纤维分布的定量参数。通过无损检测得到纤维分布，并由四点抗弯试验和基于截面的图像分析得到了验证。试验还表明，是否采用振动成型将影响棱柱体试样中的纤维分布。添加3%体积率钢纤维的超高性能混凝土棱柱体，在振动成型条件下，有着更高的电感数据、单位面积纤维数和更高的抗弯强度。Abstract：Theinfluenceoftheun-uniformdistributionoffibersinultra-highperformancefiberreinforcedconcreteonthepropertieswasstudied.Basedonthemagneticeffectofsteelfiber,thenon-destructivemagneticprobeinductancedetectionmethodcanbeappliedtodetectthetwo-dimensionalplaneandthree-dimensionalspatialdistributionofsteelfiberinultra-highperformanceconcrete.Thisnon-destructivetestingmethodisappliedtoultra-highperformanceconcreteprismsamples.Themeasurementinductanceisobtainedbyplacingamagneticprobeonthesidesurfaceoftheprism,i.e.,thetopandbottomsurfacesofthebendingtest,toobtainaquantitativeparameterforthefiberdistribution.Thefiberdistributionobtainedbynon-destructivetestingwasverifiedbythefour-pointbendingtestandcross-sectionalimageanalysisofthespecimen.Theresultsalsoshowthattheuseofvibrationshapingwouldaffectthefiberdistributionoftheprismaticsample.Additionof3%volumerateofsteelfiberultra-highperformanceconcreteprism,inthevibrationmoldingconditions,haveahigherinductancedata,thenumberoffibersperunitareaandhigherbendingstrength.

李路帆,夏骏,濮琦.基于磁探针电感检测法检测UHPFRC中纤维的空间分布[J].混凝土与水泥制品,2018(5):53-57. LI L F,XIA J,PU Q.Detection of Spatial Distribution of Fibers in UHPFRC Based on Magnetic Probe Inductance Detection[J].China Concrete and Cement Products,2018(5):53-57.

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