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混 凝 土 研 究

再生微粉混凝土抗冻性及抗硫酸盐侵蚀性能研究
再生微粉混凝土抗冻性及抗硫酸盐侵蚀性能研究
  • 张 平,古龙龙,李 凯,王子萌,卢 霄
2020年3期   No.287   P27-30
摘要
引用本文
摘  要:以28d活性指数为85%的再生微粉按胶凝材料10%、20%、30%加入混凝土中,进行了再生微粉混凝土冻融循环试验及抗硫酸盐侵蚀性能研究。试验结果表明,再生微粉掺量低于20%时,掺量越高,混凝土的抗冻性能越好;通过SEM结果发现,混凝土冻融损坏是因水分子受冻膨胀导致钙矾石结晶裂缝和骨料与晶体间裂缝;再生微粉掺量越高混凝土抗硫酸盐侵蚀性能越低,且随着侵蚀时间的增加,该效果更加显著;EDS结果表明,干湿循环破坏的混凝土内部S元素急剧增加,形成的碳硫硅钙石膨胀导致混凝土内部产生结构裂缝是混凝土损伤的主要原因。 Abstract: InsteadofregularclassⅡflyash,therecycledfinepowderswithanactivityindexof85%for28dweremixedinconcrete,andthesubstitutionrateswere10%、20%、30%ofcementitiousmaterials.Thefreeze-thawcycletestsandmicroperformanceofrecycledfinepowderconcretewerecarriedout.Theresultsshowthatwhentherecycledpowdercontentislowerthan20%,thehigherdosage,thebettertheFreeze-thawresistanceofconcrete.TheresultsofSEMindicatethattheprincipleoffreezing-thawingdamageofconcreteisthatthewatermoleculesexpandedduringfreezingcausedthecrystalcracksofettringiteandthecracksbetweenaggregatesandcrystals.Thehigherthecontentofrecycledfinepowder,thelowertheresistanceto sulfateerosionofconcrete.Throughenergyspectrumanalysis,itisfoundthattheSelementintheconcretedestroyedbythewetanddrycycleincreasessharply,andtheexpansionofthaumasitecausescracksintheinternalstructureoftheconcrete.
张平,古龙龙,李凯,等.再生微粉混凝土抗冻性及抗硫酸盐侵蚀性能研究[J].混凝土与水泥制品,2020(3):27-30.
ZHANG P,GU L L,LI K,et al.Study on Frost Resistance and Sulfate Resistance of Concrete with Recycled Fine Powder[J].China Concrete and Cement Products,2020(3):27-30.
基于牺牲阳极法的LiBr改性砂浆性能研究
基于牺牲阳极法的LiBr改性砂浆性能研究
  • 张东方1,2,3;方 翔1,2;范志宏1,2;陈 龙1,2;王 毅3
2020年3期   No.287   P24-26+30
摘要
引用本文
摘要:通过掺入LiBr制备了高活性导电砂浆,研究了LiBr掺量与砂浆电阻率及阳极活性之间的关系。结果表明:LiBr能显著降低砂浆的电阻率,并随掺量增加电阻率降低。当掺量为160 g时,砂浆的电阻率小于100 Ω·cm。LiBr的掺入能够活化阳极及促进溶解产物扩散,使阳极具备可持续发出保护电流的能力。
Abstract:High active conductive mortar was prepared by adding LiBr, and the relationship between the content of lithium bromide and the resistivity of mortar and anodic activity was systematically studied. The results show that the resistivity decreases with increasing the content of lithium bromide, and the resistivity is less than 100 Ω·cm when the content is 160 g. Moreover, the addition of lithium bromide helps to activate the anode and promote the diffusion of dissolved products, thus enable anode to generate a continuous protective current.
张东方,方翔,范志宏,等.基于牺牲阳极法的LiBr改性砂浆性能研究[J].混凝土与水泥制品,2020(3):24-26+30.
ZHANG D F,FANG X,FAN Z H,et al.Study on the Performance of LiBr Modified Mortar Based on Sacrificial Anode Method[J].China Concrete and Cement Products,2020(3):24-26+30.
HCSA膨胀剂掺量对水泥砂浆性能的影响研究
HCSA膨胀剂掺量对水泥砂浆性能的影响研究
  • 杨 宁1,2 ;韩圣铭2
2020年3期   No.287   P19-23
摘要
引用本文
摘  要:为探究HCSA膨胀剂掺量对水泥砂浆的影响,试验设计制作了6种HCSA膨胀剂掺量的水泥砂浆试块。对水泥砂浆的工作性、力学性能和收缩性能进行了测试,并通过扫描电子显微镜(SEM)观察其微观结构。研究结果表明:掺入膨胀剂能够减少水泥砂浆的初凝时间和流动度;掺入8%~10%的膨胀剂可以有效补偿水泥砂浆的自收缩;随膨胀剂掺量的增加,其抗压强度和抗折强度均呈先增加后减小的趋势;SEM结果表明,掺量4%的HCSA膨胀剂可以使水泥砂浆的微观结构得到优化。 Abstract: InordertoexploretheinfluenceofHCSAexpansionagentcontentoncementmortarperformance,sixkindsofcementmortartestblockswithHCSAexpansionagentweredesignedandmade.Theworkability,mechanicalpropertiesandshrinkagepropertiesofcementmortarweretested,anditsmicrostructurewasobservedbySEM.Theresultsshowthataddingexpansionagentcanshortentheinitialsettingtimeandfluidityofcementmortar.Inaddition,theadditionof8%~10%expansionagentcaneffectivelycompensatetheself-shrinkageofcementmortar.Thecompressivestrengthandbendingstrengthofcementmortarincreasefirstandthendecreasewiththeincreaseofexpansionagent.HCSAexpansionagentwithacontentofabout4%canoptimizethemicrostructureofcementmortar.
杨宁,韩圣铭.HCSA膨胀剂掺量对水泥砂浆性能的影响研究[J].混凝土与水泥制品,2020(3):19-23.
YANG N,HAN S M.Study on the Influence of the Dosage of HCSA Expansion Agent on Cement Mortar Performance[J].China Concrete and Cement Products,2020(3):19-23.
高温入模条件下侧墙结构混凝土早期收缩裂缝控制技术研究
高温入模条件下侧墙结构混凝土早期收缩裂缝控制技术研究
  • 张 勇1,李 明1,刘永胜2,徐 文3,田 倩1
2020年3期   No.287   P15-18+23
摘要
引用本文
摘  要:温度收缩和自收缩是导致侧墙结构混凝土在约束条件下早期收缩开裂的主要原因,考虑夏季施工混凝土高温入模时会极大提高侧墙开裂风险的现状,评估了入温度为35℃时功能材料对混凝土温度与变形的影响。结果表明,通过掺加具有温升抑制及微膨胀效果的功能材料可显著降低混凝土早期绝热温升发展速率来降低实体结构温峰,同时能够在温升和温降阶段发挥全过程补偿收缩作用,从驱动力层面上降低了侧墙结构混凝土早期收缩开裂风险。 Abstract: Temperatureshrinkageandautogenousshrinkagearethekeyfactorsthatleadtoearlyagecrackingofsidewallconcrete,andthecrackingriskwillberemarkablyincreasedwiththeincreasingofmoldtemperatureinsummerconstruction.Giventhis,theeffectoffunctionalmaterialsontemperatureanddeformationofconcretewiththemoldtemperatureof35°Cwasinvestigated.Resultsindicatethatbyusingatemperatureriseinhibitedandslightexpansionmixture,theearlyagerateofadiabatictemperaturerisecanbedecreasedsoastorealizeareductionofpeaktemperatureinentitystructure,meanwhile,shrinkagedeformationbothintemperatureriseanddropstagecanbecompensated.Inthiscase,theearlyageshrinkagecrackingriskofsidewallconcretecanbeeffectivelyreducedfromtheperspectiveofessentialdrivingforce.
张勇,李明,刘永胜,等.高温入模条件下侧墙结构混凝土早期收缩裂缝控制技术研究[J].混凝土与水泥制品,2020(3):15-18+23.
ZHANG Y,LI M,LIU Y S,et al.Study on Shrinkage Cracking Control of Sidewall Concrete under High Mold Temperature at Early Age[J].China Concrete and Cement Products,2020(3):15-18+23.
提升水泥砂浆耐酸性能的防护技术研究
提升水泥砂浆耐酸性能的防护技术研究
  • 钱文勋1,2;贺传卿3,何 旸1,2; 韦 华1,2
2020年3期   No.287   P10-14
摘要
引用本文
摘要:采用普通硅酸盐水泥、磨细矿渣和粉煤灰等原材料配制了水胶比和矿物掺合料掺量不同的4种砂浆试件,并使用环氧防护涂层对其中1种砂浆进行表面防腐涂刷。将成型的砂浆试件分别浸泡于不同pH值的硫酸溶液中。对比研究了各龄期砂浆的质量变化率和强度变化率以及不同砂浆在侵蚀试验后的表面微观形貌。结果表明,硫酸溶液对水泥砂浆有严重的腐蚀作用,在pH值较低的强酸溶液中,通过降低水胶比的方式并不能显著提升砂浆的抗酸侵蚀能力;含大掺量矿物掺合料的砂浆,其耐酸腐蚀性能有明显提升;pH≥3的中强酸和弱酸环境对水泥基材料的侵蚀作用会有明显减弱;采用环氧涂层可较大幅度提升水泥砂浆的耐酸腐蚀性。
Abstract:Based on the internal and external protection of hydraulic concrete - large amount of mineral admixture strategy and coating protection skills, the research and evaluation of different protections on the improvement of acid corrosion resistance were carried out to provide a support for acid corrosion resistance of relevant hydraulic structures. Four kinds of cement mortar with different W/C and mineral content were made by cement, slag and fly ash. The epoxy protective coating was used on one kind of the mortar, and the mortar specimens were soaked in sulfuric acid solution of different pH values. The quality change rate and intensity change rate of mortar at different ages and the microcosmic appearances of the surface sampled from different mortars after the erosion tests were compared and analyzed. The results show that sulfuric acid solution makes serious corrosive effect on cement mortar, and the ways to reduce the W/C can not significantly enhance the ability to resist acid attack for cementitious materials. The corrosion resistance of mortar can be obviously improved with large amount of mineral admixture and the erosion effect on cementitious materials can be significantly reduced while soaking in the medium-strong or weak acid environment. The epoxy resin can greatly improve the acid corrosion resistance of mortar.
钱文勋,贺传卿,何旸,等.提升水泥砂浆耐酸性能的防护技术研究[J].混凝土与水泥制品,2020(3):10-14.
QIAN W X,HE C Q,HE Y,et al.The Protection Technology for Improving Acid Resistance of Cement Mortar[J].China Concrete and Cement Products,2020(3):10-14.
石粉含量对超高性能混凝土性能影响研究
石粉含量对超高性能混凝土性能影响研究
  • 赵学涛1,杨鼎宜1,2;杜保聪1,朱从香3,杨 俊1,刘 淼1
2020年3期   No.287   P6-9
摘要
引用本文
摘  要:研究了不同石粉含量对超高性能混凝土工作性、力学性能以及抗冻性能的影响。结果表明,随着石粉含量的增加,超高性能混凝土的流动性、抗压、抗折强度均呈现出先上升后下降的趋势;石粉含量对超声波速和动弹性模量变化趋势与强度变化趋势一致;随着石粉含量的增加,抗冻性能先增加后减小;UHPC的最优石粉含量为3%~5%。 Abstract: Theinfluenceofdifferentstonepowdercontentontheworkingperformance,mechanicalpropertiesandfrostresistanceofUHPCwasstudied.Theresultsshowthatwiththeincreaseofstonepowdercontent,thefluidity,compressivestrengthandflexuralstrengthofUHPCallshowatrendoffirstrisingandthenfalling;thechangetrendofstonepowdercontenttoultrasonicvelocityanddynamicelasticmodulusisconsistentwiththechangetrendofstrength;withtheincreaseofstonepowdercontent,thefrostresistancefirstincreasesandthendecreases;theoptimalcontentofUHPCstonepowderis3%~5%.
赵学涛,杨鼎宜,杜保聪,等.石粉含量对超高性能混凝土性能影响研究[J].混凝土与水泥制品,2020(3):6-9.
ZHAO X T,YANG D Y,DU B C,et al.Study on the Effect of Stone Powder Content on Performance of Ultra-high Performance Concrete(UHPC)[J].China Concrete and Cement Products,2020(3):6-9.
超高强水泥基复合材料力学及收缩性能研究
超高强水泥基复合材料力学及收缩性能研究
  • 秦永鉴1,黄凯健1,王元纲1,王爱国2,吴建生3
2020年3期   No.287   P1-5
摘要
引用本文
摘  要:选取钢纤维和玄武岩纤维进行试验,研究了两种纤维掺量以及硅灰掺量对超高强水泥基复合材料抗压抗折强度、疲劳性能以及体积收缩率的影响。结果表明,纤维和硅灰的加入能有效改善水泥基材料的力学及收缩性能,钢纤维对水泥基材料强度提升较大,但玄武岩纤维表现出与材料更好的相容性,1.5%钢纤维、0.1%玄武岩纤维改善效果最明显,抗折、抗压强度分别提高了12.6%、3.0%和21.2%、2.7%,体积收缩率降低了12.2%、5.4%,且1.5%钢纤维的疲劳寿命是不掺纤维的近4倍,最大跨中挠度曲线呈现明显的阶段性特征;8%硅灰改善效果最大,抗折、抗压强度分别提高了13.3%、10.4%,体积收缩率降低了28.8%。 Abstract: Steelfiberandbasaltfiberwereselectedforexperiment,andtheeffectsoftheamountoftwofibers,theamountofsilicafumeonthecompressiveandflexuralstrengthandvolumeshrinkageofultra-highstrengthcementitiouscompositeswereexplored.Theresultsshowthattheadditionoffiberandsilicafumecaneffectivelyimprovethemechanicalandshrinkagepropertiesofcementitiouscomposites.Steelfiberhasgreatimprovementinstrengthforcementitiouscomposites,butbasaltfiberexhibitsbettercompatibilitywithmaterials.1.5%steelfiberor0.1%basaltfiberhasthegreatestimprovementforthecementitiousproperty,andtheflexuralandcompressivestrengthsareincreasedrespectivelyby12.6%,3.0%and21.2%,2.7%,respectively.Thevolumeshrinkagerateisreducedrespectivelyby12.2%and5.4%.Thefatiguelifeofthespecimenswith1.5%steelfiberisnearly4timesthatofthespecimenwithoutfiber,andthemaximummid-spandeflectioncurveshowsobviouslycharacteristicsofstages.8%silicaashhasthegreatestimprovementeffect.Theflexuralandcompressivestrengthincreasedrespectivelyby13.3%and10.4%,andthevolumeshrinkagerateisdecreasedby28.8%.
秦永鉴,黄凯健,王元纲,等.超高强水泥基复合材料力学及收缩性能研究[J].混凝土与水泥制品,2020(3):1-5.
QIN Y J,HUANG K J,WANG Y G,et al.Mechanical and Shrinkage Properties of Ultra-high Strength Cement Composites[J].China Concrete and Cement Products,2020(3):1-5.
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