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时间:2019-02-04
《萘系高效减水剂的吸附特性及吸附模型》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、·652·硅酸盐学报2010年硅酸盐学报第38卷第4期Vol.38,No.42010年4月JOURNALOFTHECHINESECERAMICSOCIETYApril,2010萘系高效减水剂的吸附特性及吸附模型1,22122伍勇华,何廷树,梁国正,李国新,杨守磊(1.西北工业大学理学院,西安710072;2.西安建筑科技大学材料科学与工程学院,西安710055)摘要:采用水泥水化体系和粉煤灰非水化体系2种浆体,研究萘系高效减水剂(polynaphthalenesulphonate,PNS)的吸附
2、特性及对净浆流动性的影响,更有助于深刻认识PNS的作用机理。结果表明:掺PNS的2种净浆初始扩展度及扩展度经时损失规律相同,但吸附量均随时间延长而增大,说明水泥水化并非流动度经时损失的唯一原因。高掺量的PNS在水泥颗粒表面吸附量明显大于低掺量的,但X射线光电子能谱测试表明水泥颗粒表面的C原子所占比例相差不大,说明PNS在水泥颗粒表面存在不同的吸附形态。提出了PNS动态吸附模型,即:PNS存在尾式、环式和卧式等多种吸附形态,而且3种吸附形态会随时间和吸附量的变化而变化,吸附形态的转变是导致PNS塑
3、化浆体流动性损失的重要原因之一。关键词:萘系高效减水剂;吸附模型;流动性;吸附特性;空间位阻效应中图分类号:TU528.042.2文献标志码:A文章编号:0454–5648(2010)04–0652–07ABSORPTIONCHARACTERISTICANDMODELOFPOLYNAPHTHALENESULPHONATEONPARTICLES1,22122WUYonghua,HETingshu,LIANGGuozheng,LIGuoxin,YANGShoulei(1.SchoolofScienc
4、e,NorthwesternPolytechnicalUniversity,Xi′an710072;2.SchoolofMaterialsScienceandEngineering,Xi’anUniversityofArchitecture&Technology,Xi′an710055,China)Abstract:Byusingtwopastesofcement-watersystemandflyash-watersystem,theabsorptioncharacteristicsofpol
5、ynaphthalenesulphonate(PNS)andtheireffectsonthefluidityofthepasteswerestudied.TheexperimentalresultsshowthatthechangetrendsinfluidityandflowlossofthetwopastessystemcontainingPNSaresimilar.TheadsorptionamountofPNSforbothtwopastesystemsincreaseswithtim
6、e,whichindicatesthatthecementhydrationisnotthesolereasontoexplaintheflowlossofthecement-waterpastescontainingPNS.ThoughtheadsorptionamountforthecementpastewithmorePNSishigherthanthatwithlessPNS,theamountofcarbonatommeasuredbyX-photoelectronspectrumon
7、theparticlessurfaceisnotchangedwithdifferentdosagesofPNS.ThisindicatesthatthereexistdifferentadsorptionmodelsofPNSonthecementparticle.AnewdynamicmodelofPNSadsorbedonparticlesisproposedtoexplaintheresults,i.e.thedifferentmorphologiesoftail-type,ring-t
8、ypeandhorizontal-type.Threemorpholo-gieschangeswithtimeandadsorptionamountofPNS,thetransformationoftheadsorptionmorphologyisoneoftheimportantrea-sonscausingflowlossofcementpastewithPNS.Keywords:polynaphthalenesulphonate;adsorptionmodel;fluidity;adsor
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