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时间:2020-05-23
《硫酸钠对水泥土的强度及微观孔隙影响研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第35卷第9期岩土力学Vbl_35No.92014年9月RockandSollMechanicsSep.2014文章编号l1000—7598一f2Ol4)09-2555-07硫酸钠对水泥土的强度及微观孔隙影响研究韩鹏举,刘新,白晓红(太原理工大学建筑与土木工程学院,太原030024)摘要:通过不同含量的硫酸钠水泥土抗压强度测试,分析硫酸钠对水泥土x射线衍射(XRD)物相成分改变的化学反应过程,对比分析经Image.ProPlus6.0(IPP)软件处理前、后的微观扫描电镜试验(SEM)图像,计算放大200倍下SEM图像的孔隙平均直径
2、分布规律,探讨硫酸钠对水泥土宏观强度与微观孔隙的影响规律。结果表明,硫酸钠充分参与了水泥土的固化过程,促进了Ca(OH)2、CaSO、CaCO3与C—A—S—H等水化产物的生成;水泥土强度随硫酸钠含量增加而增大,在含量等于9g/kg时达到最大值;硫酸钠使水泥土的孔径分布发生改变,放大200倍下水泥土微观图像孔隙率随着硫酸钠含量的增大呈减小趋势;当硫酸钠含量小于9g/kg时,生成的水化产物使水泥土的结构呈现较强的粒状一镶嵌一胶结结构,对强度有利,当硫酸钠含量较大时,水化产物产生的膨胀力大于胶结力,使其强度下降。关键词:微观结构;孔隙;
3、水泥土;硫酸钠;平均直径中图分类号:TU411文献标识码:AEffectofsodiumsulfateonstrengthandmicroporesofcementedsoilHANPeng-ju,LIUXin,BAIXiao—hong(ColegeofArchitectureandCivilEngineering,TaiyuanUniversityofTechnology,Taiyuan030024,China)Abstract:Inordertosimulateandstudytheefectprocessandmechanis
4、mofcementedsol1bydiferentsodiumsulfatecontents.aseriesoftestsareconductedonthecementedsoilsamples,suchascompressionstrengthtest,X—raydiffraction(XRD)phasetestandscanningelectronmicroscope(SEM)test,SEMpicturesprocessedbyImage-ProPlus6.0(IPP)software;thedistributionofpor
5、eaveragediameterofSEMpicturesat200magnifiedtimesiScalculated.Thetestresultsshowthatthecompressivestrengthofcementedsoilincreaseswiththeincreaseofsodiumsulfatecontent;andthevaluereachesitspeakwhenthecontentis9g/kg.111edistributionofcementedsollporechangesowetosodiumsulf
6、ate,andtheporosityofSEMphotoat200timesdecreases.FromtheSEMphotosanalysesshowthatthemicroscopicstructureofcementedsoilbysodiumsulfateexhibitsthegranularity-inlay—cement.ChemicalproductsareanalyzedbymeansofXRDtest.Thetestingresultsshowthatthechemicalproductsbecomemoresuc
7、hasCa(OH)2,CaSO4,CaCO3andC⋯ASH,afterthesodiumsulfateparticipatedinchemicalreactions.Thosechemicalproductsmainlyplaytheroleofcrystallizationactioninthechemicalreactionprocess,whichisgoodforcementedsoilstrengthwhenthechemicalproductsinthesamplewithsodiumsulfatecontentlow
8、erthan9g&g.Withthesodiumsulfatecontentincreasing,thegelaroundsoilparticlesisbrokendown,whichmakethestrengthofcementso
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