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时间:2020-06-05
《电石渣改良路基过湿土的微观机制研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第33卷第6期岩石力学与工程学报、,o1-33No.62014年6月ChineseJournalofRockMechanicsandEngineeringJune,20l4电石渣改良路基过湿土的微观机制研究杜延军,刘松玉,魏明俐,朱晶晶(东南大学岩土工程研究所,江苏南京210096)摘要:为揭示电石渣改良路基过湿土的强度增长机制,通过无侧限抗压强度、酸碱度、压汞和热重分析试验,从微观角度出发,探讨改良土强度与pH值、孔径分布、火山灰反应产物含量的内在联系,并与石灰改良土进行比较。结果表明,电石渣改良路基过湿土早期强度与生石灰改良土接近,而后期
2、强度为生石灰改良土的1.05~1.16倍:电石渣细粒含量约为生石灰的1.72倍,比表面积大5倍,可保障电石渣与土颗粒接触更充分;电石渣活性A1,si成分含量约为生石灰的1.7l倍,且电石渣改良土pH值可维持在l2.4~12.6(而生石灰改良土pH值低于12.4),为火山灰反应提供较好的碱性环境,水化反应更持久;28和120d龄期时,电石渣改良土的火山灰反应产物含量约为生石灰改良土的1.06和1.10倍,且微孔隙(<0.007m)和小孔隙(0.007~0.900m)的体积百分比之和分别约为生石灰改良土的1.05和1.23倍,结构更致密。关键词:
3、土力学:电石渣;路基过湿土;pH值;压汞:热重分析中圈分类号:Tu411文献标识码:A文章编号:1000—6915(2014)06—1278—08MICRoMECHANISMoFoVER.WETCLAYEYSoILSSTABILIZEDBYCALCIUMCARBIDERESIDUESDUVanjun,LIUSongyu,WEIMingli,ZHUJingjing(InstituteofGeotechnicalEngineering,SoutheastUniversity,Nanjing,Jiangsu210096,China1Abstract
4、:Toillustratethefactorscontrollingthestrengthdevelopmentofcalciumcarbideresidue(CCR)andquicklimestabilizedover-wetclaysoils,aseriesoflaboratorytestsincludingunconfinedcompression,soilpHmeasuring,mercuryintrusionporosimetry(MIP)andthermogravimetricanalysis(TGA)wereconductedt
5、oquantifytherelationshipsbetweentheunconfinedcompressivestrengthwiththesoilpH,theporesizedistributionandthecontentofpozzolanicreactionproduct.TheexperimentalresultsshowthatthestrengthsofCCRaresimilartoonesofquicklimestabilizedsoilsatearlystageandare1.05to1.16timeshigheratla
6、testage.Thefractionsofclayparticles,thespecificsurfacearea(SSA),andthecontentsofreactivesilica(Si)andalumina(A1)ofCCRreboundare1.72,5and1.71timesthoseofquicklimerespectively.ThepHvaluesoftheCCRstabilizedsoilareapproximately12.4to12.6withthecuringtimesof28to120days,whichisin
7、favorofthepozzolanicreactionsbetweentheCCRandsoilparticles.Inaddition,thepozzolanicreactionproductsinCCRstabilizedsoilare1.06and1.10timesthatofthequicklimestabilizedsoil.Thesumofvolumesofmicro(<0.007um)andsmall(0.007—0.900rtm)poresoftheCCRstabilizedsoilare1.05and1.23timesth
8、atofthequicklimestabilizedsoilwhenthecuringtimesare28and120days.Keywords:soilmecha
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