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1、第19卷第2期建筑材料學(xué)報(bào)Vo1.19。No.22016年4月JOURNALOFBUILDINGMATERIALSApr.,2016文章編號(hào):1007—9629(2016)02—0242—06再生粗骨料預(yù)處理及再生混凝土徐變試驗(yàn)研究羅素蓉,鄭欣,黃海生(1.福州大學(xué)土木工程學(xué)院,福建福州350116;2.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350116)摘要:采用預(yù)濕法、凈漿裹石法和摻硅灰凈漿裹石法對(duì)再生粗骨料進(jìn)行預(yù)處理,然后制備再生混凝土.研究不同再生粗骨料取代率(質(zhì)量分?jǐn)?shù))和不同再生粗骨料預(yù)處理法對(duì)再生混凝土徐變性能的影響.以普
2、通混凝土徐變預(yù)測模型(ACI209模型)為基礎(chǔ),考慮再生粗骨料取代率、預(yù)處理法的影響,提出了再生混凝土徐變預(yù)測模型(修正ACI209模型).結(jié)果表明:加荷1SOd時(shí),再生粗骨料取代率5O,i00的再生混凝土總徐變度較普通混凝土分別增加19和53%;3種預(yù)處理方法對(duì)減小再生混凝土的徐變變形均有明顯效果,能使加荷150d的再生混凝土徐變度降低l1%到24%.修正ACI209模型對(duì)再生混凝土徐變的預(yù)測效果良好.關(guān)鍵詞:再生粗骨料;再生混凝土;預(yù)處理;徐變;預(yù)測模型中圖分類號(hào):TU528.0文獻(xiàn)標(biāo)志碼:Adoi:10.3969/j.issn.1007—9
3、629.2016.02.006ExperimentalStudyonPretreatmentofRecycledCoarseAggregateandCreepBehaviorofRecycledAggregateConcreteLUOSurong,ZHENGXin,HUANGHaisheng(1.SchoolofCivilEngineering,F(xiàn)uzhouUniversity,F(xiàn)uzhou350116,China;2.FujianProvinceCollaborativeInnovationCenterforEnvironment—Friend
4、lyandEnergy-SavingHighPerformanceConcrete,F(xiàn)uzhou350116,China)Abstract:Threekindsofdifferentpretreatmentmethodsi.e.pre-wet,steepliquorwrappedstonecraftandincorporationofsilicafumesteepliquorwrappedstonecraftwereadoptedtotreattherecycledcoarseaggregate(RCA)fortherecycledaggrega
5、teconcrete.Theinfluencesofreplacementrates(bymass)andpretreatmentmethodsofRCAonthecreepbehaviorofrecycledaggregateconcretewerestudied.Basedonthecreeppredic—tionmodel(ACI209mode1)ofnormalconcrete(NC),theinfluencesofreplacementratesandpretreatmentmethodsofRCAwereconsideredbythe
6、creeppredictionmodelofRAC(modifiedACI209mode1).Thetestresultsindicatethatthespecifictotalcreepsofrecycledaggregateconcreteswith50and100%replacementrateofRCAincreaseby19and539/6respectivelyafterloading150d,comparedtothatofNC.Thethreepretreatmentmethodshaveobviouseffectsonthede
7、creaseofthecreepofrecycledaggregateconcrete,whichcanreducethespecificcreepofrecycledaggregateconcreteby11%to24.ThecreeppredictionsofmodifiedACI209modelhavegoodforecastsfortherecycledaggregateconcrete.Keywords:recycledcoarseaggregate(RCA);recycledaggregateconcrete;pretreatment
8、;creep;predictionmnde1再生混凝土技術(shù)的應(yīng)用一方面節(jié)省了大量的建自然資源,保護(hù)生態(tài)環(huán)境Ⅲ.再生混凝土的主要特點(diǎn)筑垃圾