基于聲發(fā)射技術(shù)的納米混凝土粗集料粒徑和尺寸效應(yīng)試驗(yàn)研究.pdf

1、學(xué)位論文獨(dú)創(chuàng)性聲明學(xué)位論文獨(dú)創(chuàng)性聲明本人聲明所呈交的學(xué)位論文是本人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作及取得的研究成果。據(jù)我所知，除了文中特別加以標(biāo)注和致謝的地方外，論文中不包含其他人已經(jīng)發(fā)表或撰寫過的研究成果，也不包含為獲得直昌態(tài)堂或其他教育機(jī)構(gòu)的學(xué)位或證書而使用過的材料。與我一同工作的同志對(duì)本研究所做的任何貢獻(xiàn)均已在論文中作了明確的說明并表示謝意。學(xué)位論文作者簽名c手寫笏緣弘簽字吼扣哆年多月8日學(xué)位論文版權(quán)使用授權(quán)書本學(xué)位論文作者完全了解直昌

2、大學(xué)有關(guān)保留、使用學(xué)位論文的規(guī)定，有權(quán)保留并向國(guó)家有關(guān)部門或機(jī)構(gòu)送交論文的復(fù)印件和磁盤，允許論文被查閱和借閱。本人授權(quán)直昌太堂可以將學(xué)位論文的全部或部分內(nèi)容編入有關(guān)數(shù)據(jù)庫進(jìn)行檢索，可以采用影印、縮印或掃描等復(fù)制手段保存、匯編本學(xué)位論文。同時(shí)授權(quán)中國(guó)科學(xué)技術(shù)信息研究所和中國(guó)學(xué)術(shù)期刊(光盤版)電子雜志社將本學(xué)位論文收錄到《中國(guó)學(xué)位論文全文數(shù)據(jù)庫》和《中國(guó)優(yōu)秀博碩士學(xué)位論文全文數(shù)據(jù)庫》中全文發(fā)表，并通過網(wǎng)絡(luò)向社會(huì)公眾提供信息服務(wù)。(保密的學(xué)位

3、論文在解密后適用本授權(quán)書)學(xué)位論文作者簽名(手寫)易薄執(zhí)簽字日期：≯J多年多月鏟日新簽名(手瓢出鋤簽字日期：知哆年／月亨日ABSTRACTABSTRACTComparedWithotherNDTmethods，acousticemissiondetectiontechniquehastheadvantagesofrealtime，dynamicandeasythesefeaturesmaketheacousticemissiontech

4、niquehasbeenwidelyappliedintheevaluationofmaterialsperformanceandstructureorcomponentdamagedetectionAcousticemissiontechniqueisappliedtOstudyplaincementconcretehasahistoryofdecadesandhasgottensomeencouragingresearchresul

5、ts，buttheacousticemissiontechniqueiSappliedtostudynano—concreteisrarelyreportedThiSpaperbasedonacousticemissiondetectiontechnique，studiedthecompressionstrengthandacousticemissioncharacteristicsofconcretespecimenswith15％c

6、ontentofnanoSi02underuniaxialcompression，andverifiedtheOhtsumodelandDaimodelThemaincontentsareasfellows：(1)Basedonacousticemissiondetectiontechnique，theuniaxialcompressiontestoffivegroupsnano。concretecubicspecimenswithma

7、ximumcoarseaggregatesizeare95mrn132mm，16mrn195mmand265mm，studiedthecompressivestrengthandacousticemissioncharacteristicsofnanoconcretespecimenswithdifferentmaximumcoarseaggregatesizeTheresultsshownthattheincorporationofn

8、ano‘Si02canimprovethecompressivestrengthoftheconcrete，andthecompressivestrengthincreasedwiththeincreaseofthemaximumcoarseaggregatesizewhenthemaximumcoarseaggregatesizeis16mmthecompressivestrengthisthehighest，thenthecompr

9、essivestrengthtendstoastablevaluewiththeincreaseofthemaximumcoarseaggregatesize；theacousticemissionactivityofnano—concretedecreasedwiththeincreaseofthemaximumcoarseaggregatesize；acousticemissionsourcecanbedividedIntothre

10、etypes，whicharecausedbythedestructionofinterfacialtransitionzone，hardenedcementpasteandcoarseaggregate(2)Basedonacousticemissiondetectiontechnique，theuniaxialcompressiontestofthreegroupsnano。concretecubicspecimenswithsiz

11、eare100mm，150mmand200mmstudiedthecompressivestrengthandacousticemissioncharacteristicsofnano。concretespecimenswithdifferentsizeTheresultsshownthatthecompressivestrengthofnano。concretedecreasedwiththeincreaseinthesize，and