苏州混凝土水泥制品研究院有限公司

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发布时间:2020-01-06 00:00:00
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混凝土研究

石膏对铝酸钙水泥混凝土力学与耐久性能的影响
石膏对铝酸钙水泥混凝土力学与耐久性能的影响
  • 李亚丽1,赵兰英1,张舜泉2
2020年2期
摘要
引用本文
摘  要:用二水石膏(CaSO4·2H2O)和α型半水石膏(α-CaSO4·0.5H2O)粉末分别部分取代铝酸钙水泥(CAC)制备了CAC混凝土,研究了其在不同掺量下对CAC混凝土力学与耐久性能的影响。试验研究了CAC混凝土试样的抗压强度、劈裂抗拉强度、氯离子渗透性以及抗硫酸盐的侵蚀性能,探究了CaSO4类型和掺量对各项指标的影响。结果表明,掺入CaSO4会降低CAC混凝土的早期强度,但可显著抑制其后期强度衰减,当CaSO4·2H2O和α-CaSO4·0.5H2O掺量分别为6%和4%时,CAC混凝土的后期强度衰减量最低,Cl-扩散系数最小,且在Na2SO4侵蚀溶液中劣化程度最低。因此,CaSO4·2H2O和α-CaSO4·0.5H2O均可有效改善CAC混凝土的力学性能与耐久性能,两者的最优掺量分别为6%和4%。 Abstract: Theeffectof CaSO4 withvariouscontentsonmechanicalpropertiesanddurabilityofcalciumaluminatecement(CAC)concretewasinvestigatedbypartiallysubstitutingCACpowderwithdihydrate(CaSO4·2H2O)andα-hemihydrate(α-CaSO4·0.5H2O).TheperformancesoftheCACconcretesampleswithdifferentmixingproportionsweretested,includingthecompressivestrength,splittingtensilestrength,chlorideionspenetrability,andsulfatecorrosionresistance.Also,theinfluenceofthetypeandamountof CaSO4 onsuchpropertieswasdiscussed.TheresultsshowthattheearlystrengthofCACconcretecanbereducedduetotheincorporationof CaSO4,whereastheattenuationoftheirlaterstrengthmaybeevidentlyinhibited.Whenthecontentsof CaSO4·2H2Oandα-CaSO4·0.5H2O are6%and4%,respectively,thestrengthattenuationofCACconcretereachestheminimum,andtheminimumchlorideionspermeabilitycoefficientisobserved.ThesulfatecorrosionresistanceofCACconcretecanbeobviouslyenhancedbyincorporating CaSO4.Specifically,whentheamountsof CaSO4·2H2O andα-CaSO4·0.5H2O areequalto6%and4%,respectively,thedeteriorationdegreeofCACconcreteexposedtoNa2SO4solutionisthelowest.Therefore,theincorporationof CaSO4·2H2O andα-CaSO4·0.5H2O canimprovegreatlythemechanicalpropertiesanddurabilityofCACconcrete,andtheoptimumcontentsofthetwotypeof CaSO4 are6%and4%,respectively.
李亚丽,赵兰英,张舜泉.石膏对铝酸钙水泥混凝土力学与耐久性能的影响[J].混凝土与水泥制品,2020(2):24-27,41. LI Y L,ZHAO L Y,ZHANG S Q.Effect of CaSO4 on Mechanical Properties and Durability of Calcium Aluminate Cement Concrete[J].China Concrete and Cement Products,2020(2):24-27,41.
不同组成材料对混凝土韧性和抗冲击性能的影响研究
不同组成材料对混凝土韧性和抗冲击性能的影响研究
  • 瞿 竹1,张 力1,王德辉2
2020年2期
摘要
引用本文
摘  要:为了解决高速公路桥梁伸缩缝槽口裂缝问题,研究了不同组成材料对混凝土韧性和抗冲击性能的影响。研究结果表明,掺入辅助性胶凝材料和复合纤维提高了混凝土的韧性指数和冲击能,掺入辅助性胶凝材料混凝土的韧性指数增大了13%~113%,冲击能增大了-19%~84%。扫描电镜、X射线衍射仪和能谱分析仪的测试结果表明,辅助性胶凝材料的掺入降低了纤维-水泥石界面过渡区Ca(OH)2和钙矾石的含量,可改善混凝土的性能。 Abstract: Inordertosolvethecrackingoftheexpansionjointslotofthehighwaybridge,theeffectsofdifferentcompositionsonthetoughnessandimpactresistanceofconcretewereinvestigated.Testresultsshowthat theincorporationofsupplementarycementitiousmaterialsimprovethetoughnessindexandimpactenergyofconcrete.Thetoughnessindexofconcreteincreasesby11%~113%,andtheimpactenergyofconcreteincreasesby-19~84%.Concretecontainingfibershasalowriskofcracking.Accordingtothetestresultofscanningelectronmicroscope(SEM),X-raydiffraction(XRD)andenergydispersivespectroscopy(EDS),theincorporationofsupplementarycementitiousmaterialsreducesthecontentofcalciumhydroxide(CH)andettringite(AFt)intheinterfacialtransitionzoneoffiberandmatrix,andimprovesthepropertiesofconcrete.
瞿竹,张力,王德辉.不同组成材料对混凝土韧性和抗冲击性能的影响研究[J].混凝土与水泥制品,2020(2):28-31.
QU Z,ZHANG L,WANG D H.Effects of Different Composition on the Toughness and Impact Resistance of Concrete[J].China Concrete and Cement Products,2020(2):28-31.
干湿循环下透水型生态混凝土硫酸盐侵蚀试验研究
干湿循环下透水型生态混凝土硫酸盐侵蚀试验研究
  • 惠 洋1,刘荣桂1,徐荣进1,石 炜2,刘尚志3,郭彦领3
2020年2期
摘要
引用本文
摘  要:对透水型生态混凝土在不同浓度硫酸盐干湿循环条件下进行了侵蚀试验,测定了透水型生态混凝土的抗压强度耐蚀系数、相对动弹性模量和质量变化率。并辅以SEM电镜和EDS成分分析,探究了不同浓度硫酸盐侵蚀下试件微观损伤过程和侵蚀破坏规律。试验结果表明:在硫酸盐干湿环境下,透水型生态混凝土的抗压强度耐蚀系数、质量变化率均呈现出先上升再下降的变化趋势。浓度越高,侵蚀破坏的周期越短。通过微观分析发现,试件侵蚀产物多为硫酸钠结晶、钙矾石和石膏以及少量碳化碳硫硅钙石结晶。此外,实验室烘干会加速试件本身和侵蚀结晶碳化,生成碳硫硅钙石结晶。 Abstract: Theeffectofperviousconcreteonsulfateattackunderdry-wetcycleswasstudiedwithtestingthecompressivestrengthcorrosion,resistancecoefficientandmass-changerateofperviousconcrete.ThroughSEMandEDScomponentanalysis,thedamageprocessandregularpatternunderdifferentconcentrationsofsulfateattackwereexplored.Thetestresultsshowthatunderthedry-wetenvironmentofsulfate,thecompressivestrength,corrosionresistancecoefficientandmasschangerateofperviousconcreteshowatrendoffirstincreasingandthendecreasing.Thehighertheconcentration,theshortertheperiodoferosiondamage.Throughmicro-analysis,it’sfoundthattheerosionproductsofthespecimensaremostlysodiumsulfatecrystal,ettringiteandgypsum.Atthesametime,it’sfoundthatlaboratorydryingcanacceleratethecarbonizationofthetestpieceandtheetchedcrystal.Astheconcentrationofthesulfatesolutionincreases,theamountoferodedcrystallizationincreasessignificantly,causingexpansiontocausecracking.
惠洋,刘荣桂,徐荣进,等.干湿循环下透水型生态混凝土硫酸盐侵蚀试验研究[J].混凝土与水泥制品,2020(2):19-23.
HUI Y,LIU R G,XU R J,et al.Research on Sulfate Erosion of Pervious Concrete under Dry-wet Circulation[J].China Concrete and Cement Products,2020(2):19-23.
基于温度-应力试验的掺膨胀剂混凝土抗裂性能研究
基于温度-应力试验的掺膨胀剂混凝土抗裂性能研究
  • 纪宪坤,刘 猛,向 飞,饶蔚兰,王海龙,刘 勇
2020年2期
摘要
引用本文
摘  要:通过温度-应力试验研究了钙质和镁质膨胀剂(Type-CaO,Type-MgO)对混凝土早期抗开裂性能的影响。结果表明,掺10%Type-MgO和Type-CaO膨胀剂混凝土的绝热温升较基准混凝土分别提高了3.6%和14.0%,断裂温度相对基准混凝土分别降低了9.7℃和1.7℃;约束条件下,掺10%Type-MgO膨胀剂混凝土的极限拉伸值和断裂应力相对基准混凝土均提高约27%,而掺10%Type-CaO膨胀剂混凝土的极限拉伸值和断裂应力与基准混凝土无明显区别;数据表明,镁质膨胀剂相比钙质膨胀剂可以明显提高混凝土的早期抗开裂性能,钙质膨胀剂不宜用于大体积混凝土的裂缝控制。 Abstract: Theearly-agecrackingresistanceofconcretewithCaOandMgOexpansiveagentwereinvestigatedbasedonthetemperature-stresstesting.Theresultsshowthatcomparedwithreferenceconcrete,theadiabatictemperatureriseofconcretewith10%MgOandCaOexpansiveagenttestedinadiabaticmodelincreasesby3.6%and14.0%,andthecrackingtemperaturedecreasesby9.7℃and1.7℃.Inrestrainedcondition,theultimateextensionvalueandcrackingstressofconcretewith10%MgOexpansiveagentincreaseby27%,whileconcretewith10%CaOexpansiveagenthasnosignificantdifferencewithreferenceconcrete.MgOexpansiveagentcouldevidentlyimprovetheearly-ageCrackingresistanceofconcrete,andCaOexpansiveagentcannotbeappliedtocrackcontrolofmassconcrete.
纪宪坤,刘猛,向飞,等.基于温度-应力试验的掺膨胀剂混凝土抗裂性能研究[J].混凝土与水泥制品,2020(2):14-18.
JI X K,LIU M,XIANG F,Study on the Early-age Cracking Resistance of Concrete with Expansive Agent Using Temperature-stress Testing Machine[J].China Concrete and Cement Products,2020(2):14-18.
海洋环境下珊瑚混凝土中钢筋表面蚀坑发展的研究
海洋环境下珊瑚混凝土中钢筋表面蚀坑发展的研究
  • 吴 庆,王 刚,顾鹏远,史文浩,李薛忠,许 耀,王石林
2020年2期
摘要
引用本文
摘  要:为了研究不同海洋环境下珊瑚混凝土中钢筋表面蚀坑的发展情况,通过浸泡和干湿循环两种养护方式来模拟水下区和潮汐区两种环境,对比分析了两种环境下珊瑚混凝土中HPB300钢筋的锈积率、失重率以及其与蚀坑数目之间的关系;建立了表面蚀坑的尺寸分布模型并阐述了蚀坑的生长演变机理。研究表明,对比浸泡条件,在干湿循环条件下的混凝土中钢筋失重率及锈积率更高,且在60d时蚀坑数量出现小规模的集中增长;不同时期钢筋表面蚀坑尺寸分布函数均可表示为P=α+βeS,且其中大部分都属于亚稳态的微观蚀坑;在干湿循环养护方式下首先发育出尺寸较大的宏观蚀坑;90d内随着混凝土龄期的增长,干湿循环下蚀坑尺寸分布不均,而浸泡条件下蚀坑尺寸渐趋接近。 Abstract:Inordertostudythedevelopmentofcorrosionpitsonthesurfaceofsteelbarsincoralconcreteunderdifferentmarineenvironments,thecorrosionrateandweightlossrateofHPB300steelbarincoralconcreteandtherelationshipbetweenthemandthenumberofcorrosionpitswereobtainedandanalyzedbyimmersionanddry-wetcyclingcuringmethodstosimulatetheunderwaterandtidalenvironments.Thesizedistributionmodelofsurfacepitswasestablishedandthegrowthandevolutionmechanismofpitswasexpounded.Theresultsshowthatcomparedwithsoakingconditions,theweightlossrateandrustaccumulationrateofsteelbarsinconcreteunderdry-wetcyclingconditionsarehigher,andthenumberofcorrosionpitsincreasescentrallyinasmallscalein60d.ThesizedistributionfunctionofpitsonsteelbarsindifferentperiodscanbeexpressedasP=α+βeS,andmostofthembelongtometastablemicro-pits.Inthedry-wetcycliccuringmode,themacroscopicalcorrosionpitswithlargersizearefirstdeveloped.Within90d,withtheincreaseofconcreteage,thesizedistributionofpitsisunevenunderdry-wetcycling,whilethesizeofpitstendstoapproximateunderimmersionconditions.
吴庆,王刚,顾鹏远,等.海洋环境下珊瑚混凝土中钢筋表面蚀坑发展的研究[J].混凝土与水泥制品,2020(2):5-9. WU Q,WANG G,GU P Y,et al.Development of Corrosion Pits on Reinforcement Surface in Coral Concrete under Ocean Environment[J].China Concrete and Cement Products,2020(2):5-9.
玻璃微珠对OPC-SAC体系复合胶凝材料性能的影响及在3D打印中应用
玻璃微珠对OPC-SAC体系复合胶凝材料性能的影响及在3D打印中应用
  • 吴 庆,王 刚,顾鹏远,史文浩,李薛忠,许 耀,王石林
2020年2期
摘要
引用本文
摘  要:通过在OPC-SAC体系和矿物掺合料组成的复合胶凝材料中掺入中空玻璃微珠,制备出了符合挤出式建筑3D打印要求的材料。实验结果表明,复合胶凝材料体系初凝时间为11~19min,终凝时间为20~45min;3d抗压强度为50~70MPa,3d抗折强度为5~7MPa,28d抗压强度为60~90MPa,28d抗折强度为7~12MPa;可满足建筑3D打印的可挤出性、可建造性和可连续性的要求。Abstract:ThecompositecementitiousmaterialcomposedofrawmaterialasOPC-SACsystemandmineraladmixtureisusedtomeettherequirementsof3Dprintingofextrusionbuildingbyaddingthehollowglassbeads(HGB).Theresultsshowthattheinitialsettingtimeofthecompositecementitiousmaterialis11~19min,thefinalsettingtimeis20~45min,thecompressivestrengthof3dis50~70MPa,theflexuralintensityof3dis5~7MPa,thecompressivestrengthof28dis60~90MPa,andtheflexuralstrengthof28dis7~12MPa,whichcanmeettherequirementsoftheextrusion,constructionandcontinuityof3Dprintingofbuildings.
曹香鹏,黄明洋.玻璃微珠对OPC-SAC体系复合胶凝材料性能的影响及在3D打印中应用[J].混凝土与水泥制品,2020(2):1-4. CAO X P,HUANG M Y.Effect of Hollow Glass Beads(HGB) on the Performance of OPC-SAC Composite Cementitious Materials and Its Application in 3D Printing [J].China Concrete and Cement Products,2020(2):1-4.
触发型微胶囊钢筋阻锈剂的制备及性能研究综述
触发型微胶囊钢筋阻锈剂的制备及性能研究综述
  • 宋子健,蔡焕春,刘永琦,葛云云,蒋林华,储洪强,王婉怡
2020年2期
摘要
引用本文
摘要:从钢筋混凝土的钢筋锈蚀理论出发,结合混凝土材料科学,概述了微胶囊的制备方法与触发机理,列举了不同触发型微胶囊阻锈剂的触发方式及触发过程;介绍了适用于研究微胶囊基本性能与表征的测试体系;总结了国内外关于微胶囊阻锈剂对混凝土性能影响的试验成果,指出了研究现状中的一些不足,并在此基础上提出有待深入研究的问题。
Abstract:Based on the theory of reinforcement corrosion of reinforced concrete, the preparation and triggering methods of microcapsules are summarized in combination with the material science of concrete. The trigger mechanisms and the triggering processes of different contact concrete microcapsules corrosion inhibitors are listed in detail. Some test systems, which are applicable to study basic properties and characterization of microcapsules, are introduced. The influences of microcapsules corrosion inhibitors on concrete properties are also reviewed. The disadvantages of the existed test methods are put forward. On the current basis, several key problems are proposed.
宋子健,蔡焕春,刘永琦,等.触发型微胶囊钢筋阻锈剂的制备及性能研究综述[J].混凝土与水泥制品,2020(2):10-13.
SONG Z J,CAI H C,LIU Y Q,et al.A Review on Preparation and Properties of Trigger-type Microcapsule Corrosion Inhibitors[J].China Concrete and Cement Products,2020(2):10-13.
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