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1、2016年第10期(總第324期)Number10in2016(TotalNoJ324)混凝土Concrete理論研究THEORETICALRESEARCHdoi:10.3969/j.issn.1002-3550.2016.10.005礦物摻合料對(duì)再生混凝土干燥收縮性能的影響陳欣∞,鄭建嵐卸。王國(guó)杰舶(1.福州大學(xué)土木工程學(xué)院,福建福州350116;2.福建江夏學(xué)院,福建福州350108;3.福建省環(huán)保節(jié)能型高性能混凝土協(xié)同創(chuàng)新中心,福建福州350108)摘要:基于70%再生粗骨料取代率和凈漿裹石法拌制再
2、生混凝土,研究不同再生細(xì)骨料取代率及礦物摻合料品種與摻量對(duì)再生混凝土干燥收縮性能的影響規(guī)律。試驗(yàn)結(jié)果表明:再生混凝土的干縮應(yīng)變比同條件下普通混凝土大40%左右,隨著礦物摻合料摻量的增加,再生混凝土的干縮應(yīng)變先減小后增大,單摻粉煤灰效果比復(fù)摻粉煤灰與礦渣效果更好,其最優(yōu)摻量為40%,此時(shí)可使再生混凝土干縮應(yīng)變低于普通混凝土。隨著再生細(xì)骨料摻量的增加,再生混凝土的干縮應(yīng)變?cè)龃?,在單摻粉煤?蝴晴況下,再生細(xì)骨料取代率在70%以?xún)?nèi)時(shí),其干燥收縮可低于普通混凝土。在分析試驗(yàn)結(jié)果基礎(chǔ)上,擬合出適用于再生混凝土干燥收
3、縮的計(jì)算模型。關(guān)鍵詞:再生混凝土;干燥收縮;礦物摻合料;再生細(xì)骨料;計(jì)算模型中圖分類(lèi)號(hào):TU528-0l文獻(xiàn)標(biāo)志碼:A文章編號(hào):1002—3550(2016)10一0016—05InfIuenceofmineraIadmi)‘tureonthedryingshrinkageperfomlanceofrecycIed∞ncr吼eCHENxin”,zHENGJi砌a小。,wANGGuoji—j(1.collegeofCivilEn垂neering,F(xiàn)uZhouUniVers毋,F(xiàn)uzhou350116,Chi
4、na;2.FujiaIlJiaIl野iaUniVers崎,F(xiàn)u曲ou350108,China;3.CoordinativeIrulovationCenterforEnvimIlITlentallyFriendlya11dEnergySavingHPC,F(xiàn)uzllou350108,China)Abstract:Theaggregatesenvelopedwimcementmethodwasusedtopmducetherecycledconcretewith70%recycledcoarseagFegate
5、replacementrate.Thefactorsthatafrectthed聊ngshIinkageofrecycledconcretewerestudied,includingrecycledfineag舒egatereplacementratesanddi仃eremkindsandcontentofmineml池ixtIlre.Theresultsshowthatmedryings塒nkagestrainofrecycledconcreteisabout40%greaterthanthatofno
6、哪a1concreteinthesarnecondition.withtheincreaSeofcontentofmineraladmiXture,thed聊ngsllrinkagesn.a(chǎn)inofre-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鵲eofrecycledfine
8、aggregater印lacementrates.B船edontheoptimalcontentofflyash,thedryingshrinkagestrainofrecycledconcretewitllnomorethaIl70%recycledfineag釅egatereplacementratecanbelowerthanthatofnomalconcrete.Basedonthetestresults,thefor