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纤维增强泡沫混凝土的研制与性能DevelopmentandPropertiesofFoamedConcretewithFiberReinforcement作者姓名林兴胜学位类型学历硕士学科、专业结构工程研究方向高性能混凝土导师及职称詹炳根副教授2007年5月合肥工业大学本论文经答辩委员会全体委员审查，确认符合合肥工业大学硕士学位论文质量要求。答辩委员会签名：（工作单位、职称）主席：完海鹰，合肥工业大学土建学院，教授委员：孙道胜，安徽建筑工业学院，教授方诗圣，合肥工业大学土建学院，教授导师：詹炳根，合肥工业大学土建学院，副教授独创性声明本人声明所呈交的学位论文是本人在导师指导下进行的研究工作及取得的研究成果。据我所知，除了文中特别加以标志和致谢的地方外，论文中不包含其他人已经发表或撰写过的研究成果，也不包含为获得合肥工业大学或其他教育机构的学位或证书而使用过的材料。与我一同工作的同志对本研究所做的任何贡献均已在论文中作了明确的说明并表示谢意。学位论文作者签字：林兴胜签字日期：07年6月9日学位论文版权使用授权书本学位论文作者完全了解合肥工业大学有关保留、使用学位论文的规定，有权保留并向国家有关部门或机构送交论文的复印件和磁盘，允许论文被查阅或借阅。本人授权合肥工业大学可以将学位论文的全部或部分论文内容编入有关数据库进行检索，可以采用影印、缩印或扫描等复制手段保存、汇编学位论文。（保密的学位论文在解密后适用本授权书）学位论文者签名：林兴胜导师签名：詹炳根签字日期：07年6月9日签字日期：07年6月9日学位论文作者毕业后去向：工作单位：电话：通讯地址：邮编：纤维增强泡沫混凝土的研制与性能摘要本文采用聚丙烯纤维、耐碱玻璃纤维和高强高弹模聚乙烯醇纤维（简称PVA纤维）研制了纤维增强泡沫混凝土，测试了纤维泡沫混凝土密度、强度、韧性、变形、热工等性能，研究并分析了纤维种类、纤维体积率以及水灰比、砂子细度等对各种性能的影响。采用图像分析方法测定了泡沫混凝土孔隙率、孔面积、孔径分布、孔形貌、孔空间排列状况等孔结构参数，分析了孔结构与各性能之间的关系。水灰比从0.5增大到0.75时，泡沫混凝土密度减小，孔隙率和孔径增大，孔形貌得到改善，导热系数和强度降低。磨细砂可以使泡沫混凝土孔径减小，改善孔形貌。三种纤维均可以提高泡沫混凝土料浆稳定性，减少泡沫破裂，从而减小纤维泡沫混凝土的密度和孔径，增大孔隙率，改善孔形貌。当泡沫用量不变时，随着纤维掺量增大，孔隙率增大，纤维泡沫混凝土的导热系数和强度相应降低。但是当纤维泡沫混凝土的密度相同时，玻璃纤维和PVA纤维可以增大泡沫混凝土抗折强度，而聚丙烯纤维则没有这种效果。掺入体积率为1.6%的玻璃纤维使抗折强度提高143%，同时使其韧性指数提高8.1倍，而导热系数变化不大。同时，三种纤维对泡沫混凝土干燥收缩有较好的抑制作用。研究结果表明，掺加一定种类和数量的纤维可以优化泡沫混凝土结构，克服泡沫混凝土的缺点和不足，得到综合性能优异的墙体材料。关键词：聚丙烯纤维；玻璃纤维；聚乙烯醇纤维；泡沫混凝土；性能；孔结构DevelopmentandPropertiesofFoamedConcretewithFiberReinforcementAbstractAfiberreinforcedfoamedconcretewasdevelopedthatcontainspolypropylenefibers,alkali-resistantglassfibersorhighstrengthandhighmodulusofelasticityPolyvinylAlcohol(PVA)fibers.Theinfluenceofmaterialfactors,suchasfibervolumefractions,water-cementratioandsandfineness,onthepropertiesoffoamedconcretewhichincludesdensity,strength,deformationandthermalconductivity,wereinvestigated.Theparametersofporestructure,suchasporeporosity,porearea,porediameter,poremorphologyandporeposition,weremeasuredwithimageprocessingsystems,andtherelationsbetweenporestructureandthepropertieswereanalyzed.Whenthewater-cementratioincreasesfrom0.5to0.75,thedensityoffoamedconcreteisdecreased;theporosityandporediameterareincreased;theporemorphologyisimproved;thestrengthandthermalconductivityaredecreasedaccordingly.Grindedsandcanbeusedtoreducetheporediameter,andimproveporemorphology.Thethreefiberscanreducefoambreakageandenhancethestabilityoffreshfoamedconcrete.Sothedensityandporediameteroffiberfoamedconcretedecrease,andporosityincreases.Andthethreefibersalsocanimproveporemorphology.Whenthefoamvolumeremainthesame,thestrengthandthermalconductivitydecreasewiththefibervolumefractionincreasesasaresultoftheincreaseinporosity.Butwhenthedensityoffiberfoamedconcretearethesame,thefiberscanenhancetheflexural-tensilestrengthoffoamedconcreteexceptpolypropylenefibers.Whentheglassfibervolumefractionis1.6%,theflexural-tensilestrengthincreasesby143%,anditsflexuraltoughnessindexisenhancedby8.1times,whilethethermalconductivitykeepslittlechange.Moreover,thethreefibersdecreasethedryshrinkageoffoamedconcrete.Theresultsshowthatincorporatingcertaintypesandquantitiesoffibercanoptimizethestructureandovercomethedeficienciesoffoamedconcretetogetawallmaterialwithintegratedhigh-performance.Keywords:Polypropylenefiber;Glassfiber;PVAfiber;Foamedconcrete;Properties；Porestructure;致谢本文是在导师詹炳根副教授的悉心指导下完成的。在学习和撰写论文期间，詹老师为我提供了良好的学习环境和许多宝贵的资料，对本论文的撰写倾注了大量的心血。詹老师不仅使我学到扎实的专业知识，导师博学、严谨的治学态度和诲人不倦的无私精神都给我留下深刻印象并产生巨大影响，使我在今后的学习、工作和生活中受益终身。我会不断进取、刻苦学习，不辜负导师的期望和教诲。衷心祝愿詹老师身体健康！特别感谢建材实验室李鹤老师对实验工作的全力支持！感谢师兄张青峰、师弟郭建雷、王锐、师妹姚春梅提供的无私帮助！感谢实验室的黄静、王纪娟助理在整个实验制备过程中的热心帮助！感谢其他所有给予我帮助的老师和同学们!感谢我的家人多年来的辛勤养育与默默支持，培养我走上成才之路。衷心祝愿父母和所有家人身体健康、生活愉快！再次感谢所有的老师、同学和朋友！没有他们的帮助，试验无法顺利完成。祝愿大家身体健康、工作顺利！作者：林兴胜二零零七年五月于合肥目录第一章前言··························································································11.1课题研究的意义··········································································11.1.1保温隔热材料在建筑中的作用及其在国民经济中的地位··········11.1.2保温隔热材料的种类及存在的问题········································21.1.3泡沫混凝土作为保温隔热材料的优缺点·································31.1.4纤维泡沫混凝土的研究意义及可行性····································41.2课题在国内外的研究现状·····························································51.2.1泡沫混凝土研究应用现状·····················································51.2.2纤维影响墙体材料性能的研究现状········································71.2.3纤维泡沫混凝土的研究应用现状···········································81.3本文的研究目的及主要内容·························································8第二章纤维对水泥基材料的复合改性作用··············································102.1概述··························································································102.2影响纤维与水泥基材复合增强作用的要素····································112.3纤维增强水泥基复合材料限制收缩时纤维的阻裂作用····················122.4纤维增强水泥基复合材料的韧性··················································14第三章原材料及试验方案设计······························································153.1原材料······················································································153.2试验方案设计············································································163.2.1试验方案设计···························································