骨料缺陷对再生混凝土力学性能的影响

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1、弟1b雹弟l删连现何科罕撤Vo1．15。NO．1学兔兔www.xuetutu.com2012年2月JOuRNALOFBUILDINGMATERIALSFeb．，2012文章编号：1007—9629(2012)01—0080—05骨料缺陷对再生混凝土力学性能的影响朋改非，黄艳竹，张九峰(北京交通大学土木建筑工程学院，北京100044)摘要：将2种普通混凝土破碎加工成再生粗骨料(RA)，经620oC高温处理，剔除RA上的附着砂浆，得到再生粗骨料H—RA，然后配制再生骨料混凝土(RAC)，测定其抗压强度、劈裂抗拉强

2、度和断裂能．结果表明：RAC的力学性能显著下降，这归因于RA破碎加_T-导致的石子损伤及其表面的附着砂浆；在低水胶比条件下，RA中的石子损伤是导致RAC力学性能下降的主要因素，而在高水胶比条件下，导致RAC力学性能下降的主要因素则是石子表面的附着砂浆；吸水率与断裂能可敏锐反映RA的缺陷特征．关键词：再生粗骨料(RA)；石子损伤；附着砂浆；吸水率；断裂能中图分类号：TU528．01文献标志码：Adoi：10．3969／i．issn．1007—9629．2012．01．015InfluenceofDefectsi

3、nRecycledAggregateonMechanicalPropertiesofRecycledAggregateConcretePENGGai—fei，HUANGYan—zhu，ZHANGJiu—feng(SchoolofCivilEngineering，BeijingJiaotongUniversity，Beijing100044，China)Abstract：Anexperimentalresearchontheinfluenceofdefectsinrecycledaggregateonmecha

4、nicalproper—tiesofrecycledaggregateconcrete(RAC)wasconducted．Concreteswithtwowater-binderratios(0．59and0．25)werebrokenintorecycledaggregate(RA)，whichmightinducedefectsintheformsofdamageofgravelinRAandmortarattachedtoRA．Atypeofthermaltreatment，i．e．heatingund

5、ertemperature620℃for3h，wasemployedtoremoveattachedmortar．Testswereconductedtodeterminecompressivestrength，tensilesplittingstrengthandfractureenergyoftheconcrete．TheexperimentalresultsrevealthatthemechanicalpropertiesofRACaresignificantlylowerthanthoseofnatu

6、ralaggregateconcrete．AstoRACwithalowwater—binderratio，graveldamageisamainfactorcausingthedecreaseinthemechani—calproperties，whilewithahighwater—binderratio，attachedmortarissuchafactor．Amongtheproper—tiesmeasuredinthisinvestigation，waterabsorptionandfracture

7、energyarethetwofactorsthatcansharplyreflectinfluenceofthedefectsinRAduringthebrokenprocess．Itissuggestedthatpriortomixproportiondesignandpreparationofconcreteusingrecycledaggregate，itisnecessarytoobtainthedetailsofdemolishedconcretesuchasitsstrengthgradeorw

8、ater—binderratio。andofthecharacteristicsofdefectsinrecycledaggregate．Keywords：recycledaggregate(RA)；graveldamage；attachedmortar；waterabsorption；fractureenergy废旧混凝土的再生利用是建筑垃圾处理与资源已进行了大量有关废旧混凝土再生利用的研究引．化