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时间:2019-05-15
《超薄膨胀型钢结构防火涂层的耐湿热性能》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l4卷第1期建筑材料学报Vol_14,NO.1学兔兔www.xuetutu.com2011年2月JOURNALOFBUILDINGMATERIALSFeb.,2O11文章编号:1007—9629(2011)O1—0036—05超薄膨胀型钢结构防火涂层的耐湿热性能王玲玲,李国强,Y.C.WANG(1.同济大学土木工程学院,上海200092;2.曼彻斯特大学土木、力学与航空学院,曼彻斯特M139PI)摘要:为考察超薄膨胀型钢结构防火涂层的防火隔热性能在某一特定环境下随使用时间的变化规律,对36个试件进行了人工加速老化试验和隔热性能试验.结果表明:高湿度环境下,涂层阻燃体系中的亲水
2、性物质(如APP)会迁移到涂层表面而被溶解,使阻燃体系的组分和配比发生变化,导致高温下阻燃体系的膨胀受阻,从而影响到膨胀倍率和膨胀层内部结构,最终导致膨胀层等效导热系数变大;1,2mm涂层试件的等效导热系数随老化时间总体上呈现出相同的变化规律,与0次循环试件相比,2,4次循环试件涂层的仅增大了1.0左右,21次循环试件涂层的增大了30.0,与21次循环试件相比,42次循环试件涂层的仅增大了3.0左右,表明经过21次循环以后,涂层已达到一个稳定状态.关键词:超薄膨胀型钢结构防火涂层;老化;隔热性能;人工加速老化试验;等效导热系数中图分类号:TU545文献标志码:Adoi:10.3
3、969/j.issn.1007—9629.2Ol1.01.008EffectsofAgingonInsulativePropertiesofIntumescentCoatingforSteelElementsWANGLing—ling,LIGuo—qiang,Y.C.WANG(1.CollegeofCivilEngineering,TongjiUniversity,Shanghai200092,China;2.SchoolofMechanical,AerospaceandCivilEngineering,UniversityofManchester,ManchesterM139
4、PL,UK)Abstract:Inordertounderstandhowthethermalpropertiesofintumescentcoatingchangewithtimeincertainenvironment,acceleratedageingtestsandfireresistancetestswerecarriedouton36steelspecimenscoatedwithintumescentcoating,ofwhich18specimenswereappliedwithintumescentcoatingof1mmthickandtheother18w
5、iththatof2mmthick.Theexperimentalresultsispresentedwithparticularfocusontheeffectsofthevariouscyclesofacceleratedagingontheeffectivethermalinsulationofthecoating.Itisconcludedthatundertheacceleratedagingregimeinthisstudy,thehydrophiliccomponentsAPPandPERmovetothesurfaceofthecoatingandcanbedi
6、ssolvedbymoisture,SOthattheintendedchemicalre—actionsofthesecomponentstoformaneffectiveintumescentchararehindered.Intumescentcoatingthick—nesshaslittleinfluenceontheacceleratedagingtestresults.Comparedtothespecimenswithoutacceler—atedaging,thespecimensthatwentthrough2and4cyclesofaccelerateda
7、gingshowlittledegradationofthermalprotectionperformance.However,thespecimensafter21cyclesand42cyclesofacceleratedagingshowconsiderabledegradationintheirfireprotectionperformancewithmuchhighereffectivethermalcon—ductivity.Theeffectivethermalconducti
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