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ID:33353957
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页数:4页
时间:2019-02-25
《再生混凝土磨耗性能改善技术研究》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、2012年第2期(总第268期)混凝土实用技术Number2in2012(To协lNo.268)ConcretePRACTICALTECHNOL0GYdoi:10.3969~.issn.1002-3550.2012.02.043再生混凝土磨耗性能改善技术研究梅迎军,郑建华(重庆交通大学土木建筑学院,重庆400074)摘要:基于磨耗试验,并以单位面积磨损量为评价指标,研究了再生粗集料取代率、掺加粉煤灰和聚合物乳液、对再生粗集料界面进行改性等4种方法对再生}昆凝土耐磨性能的影响。研究结果表明:对于再生混凝土宜采用磨损量作为其耐磨性能的评价指标。为改
2、善再生混凝土的磨耗性能,可采取的技术措施有:掺入适量粉煤灰(等量取代水泥10%,超量取代系数不超过1.4)、掺入聚合物乳液及对再生集料进行界面改性。再生混凝土磨耗性能随再生粗集料取代率的增加而降低,且与集料的洛杉矶磨耗损失密切相关;聚合物乳液的掺人显著改善再生混凝土的耐磨性能,且随着聚合物乳液掺量增加抗磨耗性能越好;采用水泥浆包裹法进行再生集料界面改性处理有利于改善再生混凝土的磨耗性能。关键词:再生混凝土;粉煤灰;聚合物乳液;界面改性;磨耗性能中图分类号:TU528.01文献标志码:A文章编号:1002—3550(2012)02—0134—04
3、Technicalapproachtoimproveabrasionpropertiesofrecycledaggregateconcrete2~IEIYing-Jun,ZI-IENGJian-Hua(SchoolofCivilEngineeringandArchitecture,ChongqinJiaotongUniversity,Chongqin400074,China)Abstract:Theweightlossperunitareaisadoptedasindextoevaluatetheabrasionpropertiesofrecy
4、cledaggregateconcrete(RAC).Fourtech—nicalmethodswhichinfluencetheabrasionpropeaiesofRACareconsidered,meyarenamedreplaceratioofrecycledcoarseaggregatetonaturalaggregate,theadditionofflyashandpolymeremulsionandinterfacemodificationofrecycledcoarseaggregate.Theresultsshowthatwe
5、ightlossperunitareaisanappropriateevaluationindextoassessthewear-resistingperformanceofRAC.Toimprovethewear-resistingperformanceofRAC,thefollowingtechnicalapproachesCallbetaken:theadditionofmoderateamountofflyash(equivalentreplaceratiois10%,andsuper-sub—stituteratioisnotmore
6、than1.4)、theadditionofpolymeremulsionandtheinterfacemodificationofrecycledcoarseaggregate.Thewear-resistingperformanceofRACiscloselyrelatedtotheLosAngelesabrasionresistancelossesofaggregateusedinRAC,andtheweightlossisincreasedastheincreasedreplaceofrecycledaggregatetonatural
7、aggregate.TheadditionofpolymeremulsioncanimprovedtheabrasionpropertiesofRACnoticeably,andthegreaterdosageofpolymeremulsion,thebetterwear-resistingperformanceofRAC.Slurrypackagemethodforinterfacemodifi—cationofrecycleaggregateishelptoimprovethewear-resistingperformanceofrecyc
8、ledconcrete.Keywords:recycledconcrete;flyash;polymeremulsion;interfacemodif
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