- 邱繼生,邢 敏,楊占魯,張程華,關 虓
2020年第6期
摘要
引用本文
摘?要:基于低場核磁共振技術,研究了聚丙烯纖維摻量分別為0、0.6kg/m3、0.9kg/m3和1.2kg/m3以及粗骨料取代率為40%的煤矸石混凝土在凍融作用下T2譜面積的分布與變化特征、內部微觀孔結構分布特性以及孔隙凍融損傷規律。結果表明,隨著凍融循環次數的增加,T2譜整體呈右移趨勢,即向大孔隙方向偏移,且T2譜面積逐漸增大的同時第一峰面積所占百分比在減小,第二峰和第三峰面積所占百分比在增加,表明凍融循環使煤矸石混凝土內部的大孔隙大幅增加,內部出現了明顯的凍融損傷;0.6kg/m3的聚丙烯纖維對煤矸石混凝土內部孔隙的細化作用最好。Abstract:Basedonlow-fieldnuclearmagneticresonance(NMR),theT2spectrumdistribution,T2spectrumareavariation,internalmicro-porestructuredistributionandporefreeze-thawdamagelawofcoalgangueconcretewith40%replacementrateofcoarseaggregateandwith0,0.6kg/m3,0.9kg/m3and1.2kg/m3polypropylenefibrecontentunderfreeze-thawcycleswerestudied.Theresultsshowthatwiththeincreaseoffreeze-thawcycles,thewholeT2spectrumshiftstotherightdirection,thatistothedirectionofmacro-pore,andwiththeareaofT2spectrumincreasesgradually,thepercentageofthefirstpeakareadecreases,whilethepercentagesofthesecondandthirdpeakareaincrease,whichindicatesthatthefreeze-thawcyclegreatlyincreasesthemacro-poreincoalgangueconcreteandcausesobviousfreeze-thawdamage.Whenthecontentofpolypropylenefibreis0.6kg/m3,thefiningeffectontheinternalporeofgangueconcreteisthebest.
邱繼生,邢敏,楊占魯,等.凍融作用下聚丙烯纖維煤矸石混凝土孔結構研究[J]混凝土與水泥制品,2020(6):41-44,48.
QIU J S,XING M,YANG Z L,et al.Pore Structure Characteristics of Polypropylene Fibre Coal Gangue Concrete under Freeze-thaw[J].China Concrete and Cement Products,2020(6):41-44,48.