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1、Seediscussions,stats,andauthorprofilesforthispublicationat:https://www.researchgate.net/publication/293244498ShrinkageofhighstrengthlightweightaggregateconcreteandfactorsinfluencingitArticle·June2004CITATIONSREADS3173authors,including:Jian-TongDingSinohydroBureau7Co.Ltd,Chengdu,Chi
2、na24PUBLICATIONS164CITATIONSSEEPROFILESomeoftheauthorsofthispublicationarealsoworkingontheserelatedprojects:ShotcreteforhighlystressedundergroundconstructionViewprojectcrackresistanceViewprojectAllcontentfollowingthispagewasuploadedbyJian-TongDingon10August2018.Theuserhasrequested
3、enhancementofthedownloadedfile.第7卷第2期建 筑 材 料 学 报Vol.7,No.22004年6月JOURNALOFBUILDINGMATERIALSJun.,2004 文章编号:100729629(2004)0220138207高强轻骨料混凝土的收缩及其影响因素的研究3宋培晶, 丁建彤, 郭玉顺(清华大学土木工程系,北京100084)摘要:高强轻骨料混凝土(HSLWC)的收缩性能是预应力HSLWC结构设计的重要参数.采用低吸水率(2.5%)轻骨料、28d抗压强度为55～65MPa的HSLWC,其180d龄期时-4-4的收
4、缩率值范围是5.2×10～7.7×10,且180d龄期之内的收缩率统计值比JGJ-4-451—2002规程的限值大0.7×10～2.8×10,这当中主要的差异发生在早期.HSLWC的收缩随轻骨料含水率和绝干密度的增大、胶凝材料用量的减少而减小.采用混合骨料(高、低吸水率轻骨料混合或轻骨料与普通密度粗骨料混合)、添加减缩剂,将有助于减小HSLWC的收缩.关键词:高强轻骨料混凝土;收缩;含水率;混合骨料;减缩剂中图分类号:TU528文献标识码:AShrinkageofHighStrengthLightweightAggregateConcreteandFact
5、orsInfluencingItSONGPei2jing,DINGJian2tong,GUOYu2shun(DepartmentofCivilEngineering,TsinghuaUniversity,Beijing100084,China)Abstract:Shrinkageofhighstrengthlightweightaggregateconcrete(HSLWC)isanimportantpa2rameterforthedesignofprestressedHSLWCstructures.HSLWCwitha28dcompressivestre
6、ngthof55～65MPa,whichwaspreparedwithlightweightaggregatewithalowwater2absorption,hada180-4-4-4dshrinkageof5.2×10～7.7×10.TheshrinkageofsuchHSLWCwithin180dwas0.7×10-4～2.8×10largerthantherecommendedvaluesofJGJ51—2002,theChinesenationaltechnicalspecificationsforlightweightaggregateconc
7、rete(LWC).Mostofthedifferencehappenedatearlyages.ShrinkageofHSLWCincreaseswiththereductionofthedensityandmoisturecontentoflightweightaggregate,andtheincreaseofbindercontent.ItishelpfultoreduceshrinkageofHSLWCbyusingmixedcoarselightweightaggregateswithhighandlowmoisturecontentorlig
8、htweightaggre2gatemixedwithnormal
