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偏高岭土对高性能水泥砂浆性能的影响-东南大学学报.pdf

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第45卷第1期 东南大学学报(自然科 学版 ) Vol.45 No.1   2015年1月 JOURNALOFSOUTHEASTUNIVERSITY(NaturalScienceEdition)   Jan.2015 doi:10.3969/j.issn.1001-0505.2015.01.022 偏高岭土对高性能水泥砂浆性能的影响 姜 广  戎志丹  孙 伟 (东南大学江苏省土木工程材料重点试验室,南京211189) 摘要:研究了偏高岭土的火山灰活性,考察了不同偏高岭土掺量对高性能水泥砂浆的流动度、抗 折强度、抗压强度和氯离子渗透性的影响.试验结果表明:偏高岭土的火山灰活性高于硅灰;偏高 岭土颗粒形貌的不规则性会降低新拌砂浆的流动度;偏高岭土的掺入使砂浆的抗折强度降低,90 d养护龄期时偏高岭土掺量为10%的砂浆抗折强度高于偏高岭土掺量为6%,14%的砂浆抗折 强度.偏高岭土掺量为10%的砂浆的后期抗压强度最高,90d养护龄期时可达96.3MPa;56d 龄期时偏高岭土掺量为0%,6%,10%,14%的砂浆的氯离子渗透性都较低,电通量分别为165, 221,191,158C. 关键词:偏高岭土;火山灰活性;力学性能;氯离子渗透性 中图分类号:TU528  文献标志码:A  文章编号:1001-0505(2015)01012105 Effectsofmetakaolinonpropertiesofhighperformancemortar JiangGuang  RongZhidan  SunWei (JiangsuKeyLaboratoryofConstructionMaterials,SoutheastUniversity,Nanjing211189,China) Abstract:Thepozzolanicreactivityofmetakaolinandtheeffectsofdifferentmetakaolincontentson fluidity,flexuralstrength,compressivestrengthandchlorideionpenetrabilityofhighperformance mortararestudied.Theexperimentalresultsshowthatthepozzolanicreactivityofmetakaolinis higherthanthatofsilicafume.Theirregularmorphologyofmetakaolindecreasesthefluidityof freshmortars.Theflexuralstrengthofthemortarsdecreasesduetotheadditionofmetakaolin,and atthecuringageof90dtheflexuralstrengthofthemortarswiththemetakaolincontentof10% is higherthanthosewiththemetakaolincontentsof6% and14%.Inaddition,thecompressive strengthofthemortarswiththemetakaolincontentof10%isthehighest,whichreaches96.3MPa whenthecuringageis90d.Thechlorideionpenetrabilitiesofthemortarswiththemetakaolincon tentsof0%,6%,10% and14% arelowwhenthecuringageis56d,andthetotalchargesare 165,221,191,158C,respectively. Keywords:metakaolin;pozzolanicreactivity;mechanicalproperties;chlorideionpenetrabilit
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