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时间:2019-11-27
《聚合物水泥砂浆的力学性能与微观机理研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第42卷第6期2010年12月南京航空航天大学JournalofNanjingUniversityofAeronautics憨△芗R口学报&Astronautics物水泥砂浆的力学性能与微观机理研究刘大智1沈化荣2储洪强1蒋林华1(1.河海大学力学与材料学院,南京,210098;2.淮阴工学院土木工程系,淮阴,223003)V01.42No.6Dec.2010摘要:对比了聚合物水泥砂浆和普通砂浆的抗折强度、抗压强度、弹性模量和粘结性能,并采用BET,XRD,SEM对其微观机理进行了分析,结果表明:聚合物砂浆的抗折
2、、抗压强度均高于基准砂浆,抗折强度的提高程度更明显,且随着聚灰比的增加,抗折强度逐渐增大,聚灰比为10%砂浆的抗折强度提高70.5%,抗压强度提高21.1%;聚合物砂菜的弹性模量低于基准砂浆.且随着聚灰比的增加呈逐渐降低的趋势,聚灰比为10%的砂浆比普通砂浆降低26.o%;随着聚合物掺量的增加,粘结强度有所增加.聚灰比为10%的砂浆比普通砂菜提高8.9%,但聚灰比超过lO%以后增幅较小。微现分析表明,聚合物的掺入明显改善水泥砂浆的孔结构,形成的柔性网状胶膜结构有效地改善了水泥石结构与集料的结合形态,使内部结构趋于
3、完善。关键词:聚合物;改性水泥砂浆;力学性能中图分类号:TQ528.4文献标识码:A文章编号:1005—2615(2010)06—0802—04MechanicalPropertiesandMicroscopicMechanismofPolymerModifiedMortarLiuDazhil,ShenHuaron92,ChuHongqian91,JiangLinhual(1.CollegeofMechanicsandMaterials,HohaiUniversity,Nanjing,210098,China;2
4、.DepartmentofCivilEngineering,HuaiyinInstituteofTechnology,Huaiyin,223003,China)Abstract:Themechanicalpropertiesofcementmortarwithdifferentpolymer—cements,includingflexuralandcompressivestrength,elasticmodulusandbondingstrengtharestudied.Besides,BET,XRDandSEM
5、areappliedtocharacterizethemicrostructure.Theresultsdemonstratethattheflexuralstrengthandthecompressivestrengthofpolymer—cementmortararehigherthanthatofthereferenceordinarymortar;theimprovementofflexuralstrengthofmortarisevenlarger,themortarwith10%polymer—ca—
6、mentratiois70.5%higherthantheordinarymortar;thecompressivestrengthofmortarwith10%polymer—cementratiois21.1%higherthanthatofreferenceordinarymortar.Theflexuralstrengthgraduallyincreaseswiththeincreaseofpolymer—cementratio.Theelasticmodulusofpolymer—modifiedmor
7、tarislowerthanthatofunderlyingordinarymortar,theelasticmodulusgraduallydecreasesasthepolymer—cementratioincreasesandthemortarwith10%polymer—cementratiois26.O%lowerthantheordinarymortar.Thebondingstrengthincreasesasthemixingamountofpolymerincreases,themortarwi
8、th10%polymer—cementratiois8.9%higherthanthatoftheordinarymortar,buttheincreaseislim—itedafterthepolymer—cementratioexceeds10%.Moreover,itisfoundthatthepolymerchangesthedistributionofthepo
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