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1、2015年第8期(總第310期)混凝土原材料及輔助物料Number8in2015(TotalNo.310)ConcreteMATERIALANDADMINICLEdoi:10.3969~.issn1002—3550.2015.08.015再生粗骨料對混凝土收縮性能影響的試驗研究王新杰,徐巍。封金財,朱平華(常州大學(xué)土木工程系,江蘇常州213164)摘要:為了探討混凝土抗壓強度和收縮與再生粗骨料取代率之問的關(guān)系,研究了再生粗骨料取代率為30%、40%、50%和70%混凝土的28d立方體抗壓強度和自收縮、干燥收縮的變化趨勢,并建立了自收縮和干燥收縮與取代率和齡期之問的函數(shù)關(guān)系。結(jié)果表
2、明:改變再生粗骨料的取代率,混凝土抗壓強度呈三次拋物線變化,在取代率為50%時混凝土抗壓強度取得最大值;再生混凝土的自收縮、總收縮和干燥收縮與普通混凝土變化趨勢相同,在齡期3d前發(fā)展較快,齡期7d后相對趨于平緩;再生混凝土的收縮變形隨再生粗骨料取代率的增加而逐漸增大,且在齡期28d時再生混凝土各個取代率的干燥收縮增長幅度都大于自收縮。關(guān)鍵詞:再生混凝土;再生粗骨料;取代率;混凝土的收縮;立方體抗壓強度中圖分類號:TU528.04l文獻(xiàn)標(biāo)志碼:A文章編號:1002—3550(2015)08—0059—04Experimentalresearchontheinfluenceofrec
3、ycledcoarseaggregateontheshrinkageofconcreteWANGxinjie,XUWei,F(xiàn)ENG]incai,ZHUPinghua(DepartmentofCivilEngineering,ChangzhouUniversity,Changzhou213164,China)Abstract:Forthepurposeofexploringtheinfluenceofrecycledcoarseaggregatereplacementrationoncompressives~engthandshrinkageofconcrete,thecubeco
4、mpressivestrengthattheageof28days,autogenousshrinkageanddryingshrinkageofconcretewiththerecycledCOarseaggregatereplacementrateof30%,40%,50%and70%wereresearched.Andthefunctionalrelationshipbetweentheautogenousshrinkage,dryingshrinkageandtherecycledcoarseaggregatereplacementrate,ageofconcretewa
5、sestablished.Theresultsshowthatthecompressivestrengthreachedtothelargestwhenthereplacementratioofrecycledcoarseaggregateis50%,andtherela—tionshipbetweencubiccompressives~engthandreplacementratioisfoundtobecubicalparabola.Thevariationtrendofautogenousshrinkageandtotalshrinkageanddryingshrinkag
6、eofrecycledconcreteweresimilartothenaturalconcrete.Theshrinkagedevelopedrapidlybeforetheageof3d.a(chǎn)nditgrowthflattensrelativelyaftertheageof7d.Theshrinkageofrecycleconcretewasincreasingwiththecontentofrecycledcoarseaggregateincreased.Andattheageof28d,theincreaseamountofdryingshrinkageforeachsub
7、stitutionratewaslargerthanautogenOUSshrinkage.Keywords:recycledconcrete;recycledcoarseaggregate;replacementratio;concreteshrinkage;cubiccompressives~ength的負(fù)面影響。再生混凝土技術(shù)可實現(xiàn)對廢棄混凝土的再0引言利用,既能使其成為循環(huán)型可利用再生資源,又有利于減輕對環(huán)境的破壞,走上可持續(xù)發(fā)展的道路。隨著現(xiàn)代混凝土向高強、高性能方向發(fā)