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.

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.

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.

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.

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.

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.