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1、Seediscussions,stats,andauthorprofilesforthispublicationat:https://www.researchgate.net/publication/293244498Shrinkageofhighstrengthlightweightaggregateconcreteandfactorsin?uencingitArticle·June2004CITATIONSREADS3173authors,including:Jian-TongDingSinohydroBureau7Co.Ltd,Chengdu,Chi
2、na24PUBLICATIONS164CITATIONSSEEPROFILESomeoftheauthorsofthispublicationarealsoworkingontheserelatedprojects:ShotcreteforhighlystressedundergroundconstructionViewprojectcrackresistanceViewprojectAllcontentfollowingthispagewasuploadedbyJian-TongDingon10August2018.Theuserhasrequested
3、enhancementofthedownloadedfile.第7卷第2期建 筑 材 料 學(xué) 報(bào)Vol.7,No.22004年6月JOURNALOFBUILDINGMATERIALSJun.,2004 文章編號:100729629(2004)0220138207高強(qiáng)輕骨料混凝土的收縮及其影響因素的研究3宋培晶, 丁建彤, 郭玉順(清華大學(xué)土木工程系,北京100084)摘要:高強(qiáng)輕骨料混凝土(HSLWC)的收縮性能是預(yù)應(yīng)力HSLWC結(jié)構(gòu)設(shè)計(jì)的重要參數(shù).采用低吸水率(2.5%)輕骨料、28d抗壓強(qiáng)度為55～65MPa的HSLWC,其180d齡期時(shí)-4-4的收
4、縮率值范圍是5.2×10～7.7×10,且180d齡期之內(nèi)的收縮率統(tǒng)計(jì)值比JGJ-4-451—2002規(guī)程的限值大0.7×10～2.8×10,這當(dāng)中主要的差異發(fā)生在早期.HSLWC的收縮隨輕骨料含水率和絕干密度的增大、膠凝材料用量的減少而減小.采用混合骨料(高、低吸水率輕骨料混合或輕骨料與普通密度粗骨料混合)、添加減縮劑,將有助于減小HSLWC的收縮.關(guān)鍵詞:高強(qiáng)輕骨料混凝土;收縮;含水率;混合骨料;減縮劑中圖分類號:TU528文獻(xiàn)標(biāo)識碼: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
