模网钢管滤水混凝土研究

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1、大连理工大学博士学位论文模网-钢管滤水混凝土研究姓名：迟耀辉申请学位级别：博士专业：材料学（土木）指导教师：王立久20061001迟耀辉：模网．钢管滤水混凝土研究实验研究了添加MgO膨胀剂自应力钢管混凝土短柱轴压下的力学性能．研究分析了初始自应力对其强度和变形能力的影响．试验结果表明由于钢管约束膨胀产生的自应力使核心混凝±三向受压，提高了组合柱的轴压极限承载力；自应力的存在延缓了弹塑性阶段核心混凝土裂缝的扩展，提高了核心混凝土的切线模量：同时使核心混凝土内部更为致密，有效地解决了钢管混凝土脱粘的问题，有力地保证了钢管和核心混凝土的协同工作。关键词：钢管混凝土；模网；过程工程学；电渗；自应力大连

2、理工大学博士学位论文AbstractConcrete·fillcdsteeltubecombinesthebencficialqualitiesofbothsteelandconcrete．namely，highstrength，excellentductility，largeenergyabsorptioncapacityandconvenienceofconstruction．Thereforethe璐eofconcrete．filledstceltubehasbecomewidespread．Bnttherearestillsomedefectsinconcrete-fillcdstee

3、ltube．suchaswasteofresourceandenergy,environmentpollution,need8forextrafircproofmgandrustprevention,highmaintenanceexpense,inconvenienceofbeam·columnconnections，insufficiencyofconfinementeffectowingtotheinterfacedisengaging．Thusafurtherprogressofconcrete-filledsteeltubeisneeded．Thepurposeofthispaper

4、istosolveaboveproblemsbyusingtheprincipleofprocessengineeringofmaterials．Byusingtheprincipleofprocessengineeringtooptimizethe如ccorsofconcreteandchangethe托soureeandenergyflowofconstructiontoenhancetheperformanceofworkabilityofconcrete-filledsteeltubeandt0meettherequirementofsavingtheresoureeandenergy

5、,protectingtheenvironmentandtoconformthestratagemofthesustainabledevelopment，Hi曲watercementratioduringconstructionandlowwatercementratioduringsolidificationarerealizedbyusingelectroosmosistechnologyintheprocessofconcreteconstruction；theproblemssuchaspollution，poorvolumestabilityandhighercostcausingb

6、yadmixturewereresolved；realizedthereuseofresourcebyaddedlargeamountofflyash．Maininfluencingfactorsofelectroosmosissuchashydrationtime，currentintensity，watercementratioandquantityofflyashareanalyzed．Relationshipbetweenfilteringcapacityandtimeisdeduced．Designmethodformixproportions，which锄beusedinreale

7、ngineering。isproposed．Theexperimentalresultsindicatethatelectroosmosistechnologycanfurtherthefilteringvelocitymarkedly，increasethecompressivestrengthofconcretesignificantlyandhasfineeconomicalefficien