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纤维水泥及制品
何晓雁,张智鑫，张淑艳，包媛媛，张改芬
摘 要：通过循环加载压缩及电通量试验，研究了玄武岩纤维长度、养护龄期和循环加载压缩试验应力比对玄武岩纤维水泥基复合材料（BFCC）抗氯离子渗透性的影响。结果表明，随着养护龄期的增加，BFCC的6h电通量值逐渐减小；随着玄武岩纤维长度的增加，BFCC的6h电通量呈降低趋势，但是，当纤维长度从12mm增加到20mm时，BFCC的6h电通量降低速率减小；随着应力比的增加，BFCC的6h电通量呈先降低后增加的趋势，且应力比为0.2，BFCC的6h电通量值最小。Abstract:Basedonthecyclicloadingcompressionandelectricalfluxtests,theeffectsofthelengthofbasaltfiber,curingageandthestressratioofcyclicloadingcompressiontestontheresistancetochlorideionpermeabilityofbasaltfibercementcomposites(BFCC)werestudied.Theresultsshowthatwiththeincreaseofcuringage,the6helectricfluxvalueofBFCCgraduallydecreases.Whenthelengthofbasaltfiberincreases,the6helectricfluxofBFCCdecreases,however,whenthelengthofbasaltfiberincreasesfrom12mmto20mm,thedecreaserateof6helectricfluxofBFCCdecreases.Whenthestressratioincreases,the6helectricfluxofBFCCdecreasesfirstandthenincreases,andwhenthestressratiois0.2,the6helectricfluxofBFCCisthesmallest.
何晓雁,张智鑫,张淑艳,等.不同应力比下玄武岩纤维水泥基复合材料抗氯离子渗透性研究[J].混凝土与水泥制品,2020(4):46-48,53.
HE X Y,ZHANG Z X,ZHANG S Y,et al.Study on the Resistance to Chloride Ion Permeability of Basalt Fiber Cement Composites under Different Stress Ratios[J].China Concrete and Cement Products,2020(4):46-48,53.
周兴宇1，杨鼎宜1，李玉寿2，朱从香3，王彤章1，吕锦飞1，杨 俊1
摘 要：对基准混凝土（JZ）、聚丙烯细纤维混凝土（PPF）、粗纤维混凝土（PPM）以及混掺纤维混凝土（PPC）进行了抗压试验，并结合其内部损伤发展情况，研究了多尺度聚丙烯纤维混凝土的力学性能、破坏后的外貌形态以及损伤演化过程的差异。根据混凝土受力状态、声发射参数与损伤程度之间的关系，得出了纤维混凝土应力-时间-振铃计数率曲线与损伤变量D-时间曲线，探究了纤维在混凝土受压状态下的工作原理。结果表明，聚丙烯纤维的掺入可以改善混凝土破坏后的完整度，提高混凝土的抗压强度、残余强度及延性等力学性能，有效抑制了混凝土裂缝的产生与发展。Abstract:Compressivetestswerecarriedoutonreferenceconcrete(JZ),polypropylenefinefiberconcrete(PPF),coarsefiberconcrete(PPM)andblendedfiberconcrete(PPC),andthedifferencesofmechanicalproperties,damagemorphologyanddamageevolutionprocessofmulti-dimensionalpolypropylenefiberconcretewerestudiedaccordingtoitsinternaldamagedevelopment.Accordingtotherelationshipbetweenstressstate,acousticemissionparametersanddamagedegreeofconcrete,thestress-time-ringcountingratecurveanddamagevariableD-timecurveoffiberreinforcedconcretewereobtained,andtheworkingprincipleoffiberreinforcedconcreteundercompressionwasexplored.Theresultsshowthattheincorporationofpolypropylenefibercanimprovetheintegrityofdamagedconcrete,improvethemechanicalpropertiesofconcrete,suchascompressivestrength,residualstrengthandductility,andeffectivelyrestrainthegenerationanddevelopmentofconcretecracks.
周兴宇,杨鼎宜,李玉寿,等.多尺度聚丙烯纤维混凝土力学性能及损伤演化研究[J].混凝土与水泥制品,2020(4):49-53.
ZHOU X Y,YANG D Y,LI Y S,et al.Study on Mechanical Properties and Damage Evolution of Multi-size Polypropylene Fiber Reinforced Concrete[J].China Concrete and Cement Products,2020(4):49-53.
陈疏桐1,陈建东2,薛 旭3
摘 要：通过掺入5%～30%的橡胶颗粒、1～5kg/m3的玄武岩纤维，开展了玄武岩纤维橡胶混凝土力学性能及抗冻耐久性能试验研究，分析了不同配比下试件的抗压强度变化规律，探讨了玄武岩纤维、橡胶颗粒掺量对混凝土试件质量损失率、相对动弹性模量的影响。结果表明，掺入橡胶颗粒会导致混凝土抗压强度下降，但玄武岩纤维能保持试件破坏时的整体性；当橡胶颗粒用量较少时，玄武岩纤维的掺入能有效提高试件的抗压强度；橡胶颗粒及玄武岩纤维均能在不同程度上提高混凝土试件的抗冻性能，10%的橡胶颗粒掺量对冻融过程中的质量损失有较好的控制作用，但掺量过多时效果不明显；玄武岩纤维掺量对试件冻融过程中的质量损失、相对动弹模量变化相对不敏感，试件的冻融性质受橡胶颗粒的影响更加显著。Abstract:Themechanicalpropertiesandfrostresistancedurabilityofbasaltfiberreinforcedrubberconcretespecimenswerestudiedbymixing5%～30%rubberparticlesand1～5kg/m3basaltfibers,andthevariationofcompressivestrengthofspecimenswithdifferentmaterialratioswasanalyzed,andthemasslossrateandrelativedynamicmodulusofelasticityofconcretespecimenswithbasaltfibersandrubberparticleswerediscussed.Theresultsshowthatthecompressivestrengthofconcretedecreaseswiththeadditionofrubberparticles,however,thebasaltfiberscanmaintaintheintegrityofthespecimenswhentheyaredamaged.Astheamountofrubberparticlesissmall,theadditionofbasaltfiberscaneffectivelyimprovethecompressivestrengthofspecimens.Bothrubberparticlesandbasaltfiberscanimprovethefrostresistanceofconcretespecimensinvaryingdegrees,themasslossinfreeze-thawprocesscanbewellcontrolledwith10%rubberparticlecontent,buttheeffectisnotobviouswhenthecontentistoomuch.Thecontentofbasaltfibersisrelativelyinsensitivetothemasslossandrelativedynamicmodulusofelasticityduringthefreeze-thawprocessandthefreeze-thawpropertiesofthespecimensaremoresignificantlyaffectedbyrubberparticles.
陈疏桐,陈建东,薛旭.玄武岩纤维橡胶混凝土力学及冻融性能试验研究[J].混凝土与水泥制品,2020(4):54-58.
CHEN S T,CHEN J D,XUE X.Experimental Research on Mechanics and Freeze-thaw Properties of Basalt Fiber Rubber Concrete[J].China Concrete and Cement Products,2020(4):54-58.