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时间:2020-06-03
《纳米高岭土改性砂浆抗酸雨侵蚀试验研究.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44卷第3期东南大学学报(自然科学版)Vo1.44No.32014年5月JOURNALOFSOUTHEASTUNIVERSITY(NaturalScienceEdition)Mav2014doi:10.3969/j.issn.1001—0505.2014.03.038纳米高岭土改性砂浆抗酸雨侵蚀试验研究张世义范颖芳李宁宁(大连海事大学道路与桥梁工程研究所,大连116026)摘要:为了研究纳米高岭土对砂浆抗酸雨腐蚀性能的影响,配置pH值为1.5的硫酸硝酸混合溶液以模拟酸雨环境,研究了模拟酸雨环境下包含不同纳米高岭土掺量(0,1%,3%
2、,5%)的砂浆试件的物理力学性质.利用场发射扫描电镜分析了酸性介质侵蚀过程中砂浆材料微观结构的变化规律,探讨了纳米高岭土对砂浆抗酸雨腐蚀性能的改善机理.试验结果表明:纳米高岭土能够改善砂浆的微观结构,提高砂浆基体密实性,掺入水泥质量1%的纳米高岭土砂浆试件抗压强度提高了21%;同时,还能有效阻碍H和SO一进入砂浆基体内部,减弱了H引起的溶蚀破坏以及SO一引起的膨胀破坏,显著提高砂浆抗酸雨腐蚀能力.酸雨腐蚀60d后,掺入水泥质量1%的纳米高岭土砂浆试件表面溶蚀现象减弱,强度损失率较普通砂浆试件降低27.23%.关键词:纳米高岭土;砂浆;
3、酸雨;腐蚀;微观结构中图分类号:TQ177.62文献标志码:A文章编号:1001—0505(2014)03-0668-05Experimentalstudyonacidresistanceofnano.kaolinitemodifiedcementmortarZhangShiyiFanYingfangLiNingning(InstituteofRoadandBridgeEngineering,DalianMaritimeUniversity,Dalian116026,China)Abstract:Theeffectsofnano—ka
4、oliniteclayontheacidresistanceoftheordinarycementmortarareinvestigated.Tosimulatetheaciddepositcondition.theacidsolutionswithapHlevelof1.5arepreparedbythemixtureofsulfateandnitricacidinthelaboratory.Thephysica1andmechanicalpropertiesofthecementmortarwithfourdifferentamo
5、untsofnano—kaoliniteclayadditives(0,1%.3%and5%)arestudied.Thescanningelectronmicroscopy(SEM)isusedtoanalyzethemicro—structureevolutionofcementmortarduringtheacidcorrosion.andtheimprovementmechanismofthenano.kaoliniteclayfortheacidresistanceofthecementmortarisdiscussed.T
6、heexperimentalre—suitsshowthatnano—kaoliniteclayleadstoadensermicrostmctureinthemortarmatrix.Thecom—pressivestrengthofthemodifiedcementmortarwith1%nano—kaoliniteclayisincreasedbv21%.Andtheadditionofnano—kaoliniteclaycaneffectivelyimpedethepenetrationofHandS0一intotheceme
7、ntmortarmatrix.weakenthecorosiondamagecausedbyHandtheexpandingerosionbySO一,andthereforeimprovetheacidresistanceofthecementmortarsignificantly.After60dexpo—sure,thesurfaceerosionofthemodifiedcementmortarwim1%nano—kaoliniteclayweakens.andcomparedwiththeordinarycementmorta
8、r.thestrengthdegradationratiodecreasesbv27.23%.Keywords:nano—kaolinite;cementmortar;acidrain;corosion;microstr
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