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时间:2020-02-28
《聚乙烯醇纤维增强水泥基复合材料单轴受压强度与变形特性分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、聚乙烯醇纤维增强水泥基复合材料单轴受压强度*与变形特性分析李艳程格格刘泽军(河南理工大学土木工程学院,河南焦作454003)摘要:通过对不同聚乙烯醇(PVA)纤维体积掺量、水胶比、砂胶比的工程纤维增强水泥基复合材料(ECC)进行单轴受压性能试验,测得了其抗压强度及单轴受压应力-应变全曲线,主要分析PVA-ECC的破坏形态、受压性能及试件尺寸、加载速率对PVA-ECC立方体抗压强度的影响。结果表明:随着PVA纤维体积掺量的增加,PVA-ECC的抗压强度、峰值应变及极限应变均明显增大,试件塑性变形能力也越好;水胶比
2、增大,PVA-ECC的抗压强度降低,但试件达到峰值后延性增加;砂胶比为0.36时,PVA-ECC的抗压强度和压缩韧性10070.740最大。PVA-ECC的立方体抗压强度存在尺寸效应:fcu∶fcu∶fcu=0.93∶1∶1.15;加载速率越大,PVA-ECC的立方体抗压强度越高,且对于不同强度的PVA-ECC,加载速率的影响趋势相同。根据试验结果得出立方体抗压强度、峰值应变与纤维体积掺量的关系、轴心抗压强度与立方体抗压强度的关系。关键词:工程纤维增强水泥基复合材料;聚乙烯醇纤维;单轴受压;强度;变形DOI:1
3、0.13204/j.gyjz201704025ANALYSISOFSTRENGTHANDDEFORMATIONPROPERTIESONPVA-ECCUNDERUNIAXIALCOMPRESSIONLiYanChengGegeLiuZejun(SchoolofCivilEngineering,HenanPolytechnicUniversity,Jiaozuo454003,China)Abstract:BasedonunaxialcompressionexperimentsofECCwithdifferentPV
4、Afibercontentbyvolume,water-binderratioandsand-binderratio,thecompressivestrengthandstress-straincurveswereobtained.ThepapermainlyanalyzedthefailuremodeandcompressiveperformanceofPVA-ECCandtheeffectofspecimensizeandloadingrateoncubiccompressivestrength.There
5、sultsshowedthatthecompressivestrength,peakstrainandultimatestrainsignificantlyincreasedwiththeincreaseofvolumecontentofPVAfiber.Thespecimenswerealsoofhigherplasticdeformationcapacity.Astheincreasingofwater-binderratio,thecompressivestrengthreducedwhiletheduc
6、tilityincreased.Whenthesand-binderratiowas0.36,thecompressivestrengthandtoughnessweremaximum.Cubiccompressivestrengthof10070.740PVA-ECChadsizeeffectandfcu∶fcu∶fcuequaledto0.93∶1∶1.15.Astheincreasingofloadingrate,thecompressivestrengthofPVA-ECCincreasedandthe
7、loadingratehadthesameeffecttrendonPVA-ECCwithdifferentstrength.Thepaperestablishedrelationshipsbetweencubiccompressivestrengthorpeakstrainandfibercontentbyvolume,andbetweenaxialcompressivestrengthandcubiccompressivestrengthaccordingtotestresults.Keywords:eng
8、ineeredfiberreinforcedcementitiouscomposites;PVAfiber;unaxialcompression;strength;deformation[5]聚乙烯醇纤维增强水泥基复合材料PVA-ECC寿命。是在水泥砂浆中掺入乱向分布的聚乙烯醇(PVA)作为水泥基范畴内的一种材料,抗压性能指标纤维而制成的一种新型复合材料,它具有较高的延性和裂缝控制能力
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