房建材料及制品_2020_《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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房建材料及制品

玻化微珠对秸秆灰/水泥复合材料导热性能的影响

王春红1,2，鲍鑫1,2，支中祥1，KO Frank3，ZAKARIA Sarani4，左恒峰2，贾立霞5，高晓平6

2020年第7期

摘要

引用本文

摘要：通过响应面Box-Behnken实验设计，对玻化微珠增强秸秆灰/水泥复合材料的性能进行了优化研究。研究结果表明，所选模型具有显著性（P＜0.05），模型优化得出的复合材料最优工艺参数为：掺入量为10%，粒径为600μm。在最优工艺下，玻化微珠增强秸秆灰/水泥基复合材料的导热系数为0.2919W/（m·K），相比未优化处理的，导热系数降低了36%。Abstract:Throughresponsesurfacemethods,thepropertiesofglazedhollowbeadreinforcedstrawash/cementcompositesareoptimized.Theresultsshowthattheselectedmodelsaresignificant（P<0.05）,andtheoptimaltechnologicalparametersare10%oftheblendingamountand600μmtheparticlesize.Undertheconditionabove,thethermalconductivityoftheglazedhollowbeadstoenhancethestrawash/cement-basedcompositesis0.2919W/（m·K）,whichis36%lowerthanthatoftheunoptimizedtreatment.

王春红,鲍鑫,支中祥,等.玻化微珠对秸秆灰/水泥复合材料导热性能的影响[J].混凝土与水泥制品,2020(7):72-76. WANG Chun-hong,BAO Xin,ZHI Zhong-xiang,et al.Effect of Glazed Hollow Beads on Thermal Conductivity of Straw Ash/cement Composites[J].China Concrete and Cement Products,2020(7):72-76.

框支密肋复合板结构恢复力模型研究

丁巍，贾穗子

2020年第7期

摘要

引用本文

摘要：基于4榀不同构造形式的框支密肋复合板结构抗震性能试验结果，运用试验拟合法，得出了无量纲骨架曲线可采用四折线模型表示。同时模拟了结构无量纲标准滞回环，采用三折线理论给出了近屈服点和近极限点标准滞回环中各段刚度退化经验公式，定量分析了结构刚度退化规律，并提出了适于该结构的恢复力模型。Abstract:Basedontheseismicperformancetestoffourframe-supportedmulti-ribbedcompositeslabstructurespecimenswithdifferentforms,usingtheexperimentalfittingmethod,thedimensionlessskeletoncurvewasrepresentedbyfour-foldline.Besides,thedimensionlessstandardhysteresisloopsweresimulated,andstiffness-degradationempiricalexpressionofeachlineinstandardhysteresisloopatnearlyyieldandlimitpointwasgivenbythethree-linetheory,andstiffness-degradationrulewasobtainedquantitatively,furthermore,arestoringforcemodelsuitableforthestructurewasputforward.

丁巍,贾穗子.框支密肋复合板结构恢复力模型研究[J].混凝土与水泥制品,2020(7):68-71. DING Wei,JIA Sui-zi.Research on Restoring Force Model of Frame-supported Multi-ribbed Composite Slab Structure[J].China Concrete and Cement Products,2020(7):68-71.

泡沫混凝土改性试验与分析

李十泉1, 陆正华2, 张亮1, 陈亚兰3, 刘剑3

2020年第7期

摘要

引用本文

摘要：为分析发泡剂掺量、粉煤灰掺量对试件抗压强度、吸水率、导热系数、干密度的影响，开展了泡沫混凝土的配制和粉煤灰改性试验。结果表明，随发泡剂掺量增加，泡沫混凝土试件的强度、吸水率、干密度呈下降趋势，发泡剂掺量为1.25%时，泡沫混凝土试件的导热系数为0.2105W/（m·K）、吸水率为18.3%，均达到最低值；随粉煤灰掺量增加，改性试件的强度下降、吸水率提高，导热系数和干密度均先升后降；粉煤灰掺量低于30%时，微集料效应明显；若提高粉煤灰掺量，会形成更多水化物，使导热系数下降。复合改性时，掺加碳纤维可提高试件强度，但若掺量过多，则会导致强度逐步下降；导热系数随碳纤维掺量的增加逐步下降。改性前后，各组试件的性能均满足规范要求。Abstract:Inordertoanalyzetheeffectoftheamountoffoamingagentandflyashonthecompressivestrength,waterabsorption,thermalconductivityanddrydensityoffoamedconcrete,thepreparationandtestingoffoamedconcreteandflyashmodifiedfoamedconcretewerecarriedout.Theresultsshowthatthestrength,waterabsorptionanddrydensityoffoamedconcretespecimensdecreasewiththeincreaseoffoamingagent.Whentheamountoffoamingagentis1.25%,thethermalconductivityoffoamedconcretespecimenis0.2105W/（m·K）,andthewaterabsorptionis18.3%,bothofwhichreachthelowestvalue.Withtheincreaseofflyashcontent,thestrengthofflyashmodifiedfoamedconcretespecimensdecreases,thewaterabsorptionrateincreases,andthethermalconductivityanddrydensityincreasefirstandthendecrease.Whentheflyashcontentislessthan30%,themicro-aggregateeffectisobvious.Iftheamountofflyashisincreased,morehydratewillbeformedtoreducethethermalconductivity.Whencompounding,thecarbonfibercanincreasethestrengthofthetestspecimens,butifthecuttingparametersaretoomuch,thestrengthwillgraduallydecrease.Thethermalconductivityofthecompositemodifiedtestspecimenswillgraduallydecreasewiththeincreaseofthecarbonfiberamount.Beforeandafterthemodification,theperformanceofallthetestspecimensmeetstherequirementsofthespecification.

李十泉,陆正华,张亮,等.泡沫混凝土改性试验与分析[J].混凝土与水泥制品,2020(7):64-67+82. LI Shi-quan,LU Zheng-hua,ZHANG Liang,et al.Testing and Analysis of Foamed Concrete Modification[J].China Concrete and Cement Products,2020(7):64-67+82.

PC结构混凝土柱抗震性能试验研究

陈伟宏1，吴胜豪1，王晨阳1，崔双双2，梁业强1

2020年第7期

摘要

引用本文

摘要：针对PC框架结构节点区施工复杂、震后柱叠合面处混凝土易开裂的问题，提出了一种梁柱节点预制的PC结构，该结构将薄弱区由节点转移到框架柱的中部。为了研究此类PC柱的抗震性能，设计并完成了一个足尺PC柱与现浇混凝土对比柱的拟静力试验，得到了2个试件的破坏形态、滞回曲线、骨架曲线、位移延性、耗能能力以及极限承载力。结果表明，PC柱和现浇柱均为弯曲破坏；PC柱极限承载力比现浇柱高6.1%；刚度退化规律大致相同，PC柱的初始刚度和极限刚度分别为现浇柱的1.30倍和0.93倍；PC柱的延性系数为现浇柱的1.47倍；2个试件耗能能力基本相同。综上可知，此类PC柱和现浇注的抗震性能相近，且施工方便、节能环保，是一种值得推广的装配式结构连接形式。Abstract:Inviewofthecomplicatedconstructionofthejointregionoftheprecastconcretestructures(PCstructures)andtheseriouscracksofthepost-earthquakecombinedinterfaceofthecolumns,anewprecastconcretebeam-columnjointisdeveloped,whichtransferstheweakregionfromthejointregiontothemiddleofthecolumn.Tostudytheseismicperformanceofthestructure,twofull-scalecolumnswerepreparedandtestedundercycliclateralload.Onecolumnwascast-in-situandservedasacontrolspecimen,theotherwasprecast.Basedonthefailuremodes,thehystereticcurves,theenvelopcurves,theductilitycoefficient,theenergydissipationcapacityandtheultimatebearingcapacityofthetwospecimenswerediscussedindetail.Theresultsshowthatthefailuremodeofthetwospecimensisbendingfailure.TheultimatebearingcapacityofPCcolumnis6.1%higherthanthatofcast-in-situcolumn.Thestiffnessdegradationisroughlyinthesamelaw.TheinitialstiffnessandtheultimatestiffnessofPCcolumnare1.30and0.93timesthatofcast-in-situcolumn,respectively.TheductilitycoefficientofPCcolumnis1.47timesthatofcast-in-situcolumn.Thetwospecimenshavethesameenergydissipationcapacity.Insummary,PCcolumnandcast-in-situcolumnhavethesimilarseismicperformance,andtheconstructionisconvenient,energysavingandenvironmentalprotection.Theassembledstructureconnectionformisworthtobepromoted.

陈伟宏,吴胜豪,王晨阳,等.PC结构混凝土柱抗震性能试验研究[J].混凝土与水泥制品,2020(7):59-63. CHEN Wei-hong,WU Sheng-hao,WANG Chen-yang,et al.Experimental Study on Seismic Performance of Precast Concrete Column[J].China Concrete and Cement Products,2020(7):59-63.

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