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时间:2019-02-04
《轻细骨料内养护混凝土抗压强度与模拟》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、2013年第3期(总第281期)混凝土理论研究Number3in2013(TotalNo.281)ConcreteTHEORETICALRESEARCHdoi:10.3969~.issn.1002—3550.2013.03.012轻细骨料内养护混凝土抗压强度与模拟向亚平1,2,魏亚。张倩倩z,王栋民(1.中国矿业大学(北京),北京100083;2.清华大学土木工程系,北京100084)摘要:研究了2种饱水轻细骨料(粉煤灰陶砂和页岩陶砂)各自等体积取代不同普通砂时对水灰比O_3和0.4混凝土28d抗压强度影响。试验表明:取代砂体积为0~60%时,随着轻细骨料掺量
2、增加,水灰比0.3两种轻细骨料混凝土28d抗压强度都高于普通混凝土,且都在40%时达到最高;取代砂体积0~40%时,水灰比0.4两种轻细骨料混凝土28d抗压强度随轻骨料掺量增加而减小。当水灰比和取代砂体积相同时,掺粉煤灰陶砂混凝土28d抗压强度都要高于掺页岩陶砂混凝土。对含有轻细骨料混凝土的抗压强度进行理论模拟,为此提出了混凝土中轻骨料体积一孔隙率转换系数-y(o.1),结合强度孔隙率模型、Power模型和内养护浆体模型计算了轻细骨料内养护混凝土28d抗压强度,模拟结果与试验值较为吻合。关键词:轻细骨料;混凝土;内养护;抗压强度模拟中图分类号:TU528.O1
3、文献标志码:A文章编号:1002—3550(2013)03—0044—04Compressivestrengthofinternalcuringconcretewithlightweightfineaggregate-experimentandmodelingXIANGYa-ping,WEIYa2,ZHANGQian—qian。,WANGDong-min(1.ChinaUniversityofMiningandTechnology,Beijing100083,China;2.DepartmentofCivilEngineering,TsinghuaUniver
4、sity,Beijing100084,China)Abstract:Twotypesofsaturatedlightweightfineaggregates(blastfurnaceslagandshalesand)wereusedtosubstitutetheequivalentvolumeofregularfineaggregatesintheconcretespecimens(withW/Cratioof0.3and0.4).Theinfluenceon28dcompressivestrengthduetothereplacementofregularf
5、ineaggregatesbytheselightweightfineaggregateswasinvestigated.Experimentalevidenceshowedthatwhentherewas0~60%volumeoffineaggregatereplaced,at0.3W/Cratio,theconcretesampleswithlightweightfineaggregateswouldexhibithigher28dcompressivestrengththannormalconcrete.When0~40%offineaggregatew
6、assubstitutedbylightweightfineaggre—gates,forW/C=0.4,thespecimenS’28dcompressivestrengthdecreasesastheproportionoffineaggregateincreases.WhenthevolumefractionofthereplacementfineaggregateandtheW/Cwereequal,theblast-f1.nTlace-slag-blendconcretespecimenswerestrongerincom—pressivethant
7、heirshalecounterparts.Itattemptedtomodelthecompressivestrengthoflightweight—fine-aggregateconcrete.Aparameter-lightweightfineaggregatevolume—to-porosityconversioncoeficient(0-1)wasintroduced.TheStrength·porosityrelationship,Powersmodel,internalcuringpastevolumemodelwereincorporatedi
8、nthismodelpredictio
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