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时间:2020-03-23
《矿物掺合料对再生混凝土干燥收缩性能的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2016年第10期(总第324期)Number10in2016(TotalNoJ324)混凝土Concrete理论研究THEORETICALRESEARCHdoi:10.3969/j.issn.1002-3550.2016.10.005矿物掺合料对再生混凝土干燥收缩性能的影响陈欣∞,郑建岚卸。王国杰舶(1.福州大学土木工程学院,福建福州350116;2.福建江夏学院,福建福州350108;3.福建省环保节能型高性能混凝土协同创新中心,福建福州350108)摘要:基于70%再生粗骨料取代率和净浆裹石法拌制再
2、生混凝土,研究不同再生细骨料取代率及矿物掺合料品种与掺量对再生混凝土干燥收缩性能的影响规律。试验结果表明:再生混凝土的干缩应变比同条件下普通混凝土大40%左右,随着矿物掺合料掺量的增加,再生混凝土的干缩应变先减小后增大,单掺粉煤灰效果比复掺粉煤灰与矿渣效果更好,其最优掺量为40%,此时可使再生混凝土干缩应变低于普通混凝土。随着再生细骨料掺量的增加,再生混凝土的干缩应变增大,在单掺粉煤灰4蝴晴况下,再生细骨料取代率在70%以内时,其干燥收缩可低于普通混凝土。在分析试验结果基础上,拟合出适用于再生混凝土干燥收
3、缩的计算模型。关键词:再生混凝土;干燥收缩;矿物掺合料;再生细骨料;计算模型中图分类号:TU528-0l文献标志码:A文章编号:1002—3550(2016)10一0016—05InfIuenceofmineraIadmi)‘tureonthedryingshrinkageperfomlanceofrecycIed∞ncr吼eCHENxin”,zHENGJi砌a小。,wANGGuoji—j(1.collegeofCivilEn垂neering,FuZhouUniVers毋,Fuzhou350116,Chi
4、na;2.FujiaIlJiaIl野iaUniVers崎,Fu曲ou350108,China;3.CoordinativeIrulovationCenterforEnvimIlITlentallyFriendlya11dEnergySavingHPC,Fuzllou350108,China)Abstract:Theaggregatesenvelopedwimcementmethodwasusedtopmducetherecycledconcretewith70%recycledcoarseagFegate
5、replacementrate.Thefactorsthatafrectthed聊ngshIinkageofrecycledconcretewerestudied,includingrecycledfineag舒egatereplacementratesanddi仃eremkindsandcontentofmineml池ixtIlre.Theresultsshowthatmedryings埘nkagestrainofrecycledconcreteisabout40%greaterthanthatofno
6、哪a1concreteinthesarnecondition.withtheincreaSeofcontentofmineraladmiXture,thed聊ngsllrinkagesn.ainofre-c”ledconcretedecreasesatfirstandthenincreases.ComparedwithequiValentreplacementofcementwithflyaJldslaga出11ixture,tbece—mentsinglemixedwithnyashismoreefre
7、ctivetoreducethed咖ngs城nkagesnainofrecycledconcrete.Theoptimalcontentofnyashis40%.Thed聊ngshrinkagestrainofrecycledconcretewith40%contentofnyashcallbenomorethanthatofno加alconcrete.Thedryings嘣nkages仃ainofrecycledconcreteincreaseswithtlleincre鹊eofrecycledfine
8、aggregater印lacementrates.B船edontheoptimalcontentofflyash,thedryingshrinkagestrainofrecycledconcretewitllnomorethaIl70%recycledfineag酽egatereplacementratecanbelowerthanthatofnomalconcrete.Basedonthetestresults,thefor
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