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1、第31卷第3期土木工程與管理學(xué)報(bào)Vo1.31No.32014年9月JournalofCivilEngineeringandManagementSep.2014再生混凝土工作性與抗壓強(qiáng)度試驗(yàn)研究索倫,彭鵬,田波。(1.交通運(yùn)輸部公路科學(xué)研究所,北京100088;2.內(nèi)蒙古工業(yè)大學(xué)土木工程學(xué)院,內(nèi)蒙古呼和浩特010051;3.道路結(jié)構(gòu)與材料交通行業(yè)重點(diǎn)實(shí)驗(yàn)室,北京100088)摘要:通過(guò)表面粗糙度試驗(yàn)證實(shí)了與同粒徑的天然碎石相比,再生粗骨料棱角多,表面粗糙度大。針對(duì)再生粗骨料上述缺陷,設(shè)計(jì)正交試驗(yàn)對(duì)再生骨料混凝土工作性進(jìn)行了優(yōu)化,分別討論了再生骨料取代率、附加水選取、減水劑摻量、粉煤灰摻量4
2、個(gè)因素對(duì)再生混凝土和易性和抗壓強(qiáng)度的影響,采用極差分析并優(yōu)選出合理配合比。試驗(yàn)結(jié)果表明:再生粗集料表面粗糙度大于天然碎石,減水劑摻量和再生粗骨料取代率對(duì)再生混凝土和易性影響顯著,粉煤灰是影響再生混凝土早期抗壓強(qiáng)度的主要因素,附加水選取以再生骨料30min吸水率計(jì)算為宜,滿足再生混凝土良好和易性和抗壓強(qiáng)度的最佳再生混凝土組分為:再生骨料取代率50%,附加水選擇再生骨料30min吸水量,減水劑摻量選擇0.2%,不摻加粉煤灰。關(guān)鍵詞:再生混凝土;表面粗糙度;正交試驗(yàn);和易性;抗壓強(qiáng)度中圖分類號(hào):TU528.041文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):2095-0985(2014)03-0039-04Rese
3、archonWorkabilityandCompressiveStrengthofRecycledConcreteSUOLun,PENGPeng,TIANBo,。(1.ResearchInstituteofHighwayMinistryofTransport,Beijing100088,China;2.SchoolofCivilEngineering,InnerMongoliaUniversityofTechnology,Hohhot010051,China;3.KeyLaboratoryofRoadStructureandMaterialTransportationIndustry,B
4、eijing100088,China)Abstract:Recycledcoarseaggregatehasmultipleedgesandhighsurfaceroughnessconfirmedbythesurfaceroughnesstestcomparedwiththesamesizeofnaturalcoarsegrave1.Tosolvetheaboveproblems,orthogonaltesthasbeendesignedforrecycledaggregateconcreteworkabilityoptimized,andthispaperalsodiscussedt
5、heinfluenceofrecycledaggregatereplacementratio,selectedadditionalwater,dosagesuperplasticizerandflyashonthecompressivestrengthandworkabilityofrecycledconcrete.Methodofrangeanalysiswasusedtochooseareasonablemixture.Thetestresultsshowedthat:recycledcoarseaggregatesurfaceroughnessishigherthannatural
6、gravel,waterreducingdosageandrecycledcoarseaggregatereplacementrateofrecycledconcretehasasignificantimpactonworkabilityofrecycledconcrete.Themainfactorofaffectingearlycompressivestrengthofrecycledconcreteisflyash,theappropriatechooseofselectedadditionalwateris30minuteswaterabsorptionofrecycledagg
7、regate.Theoptimalworkabilityofrecycledconcretetomeetthebestcombinationoforthogonalandcompressivestrengthis50%recycledaggregatereplacementratio.30minutesselectedadditionalwaterofrecycledcoarseaggregate.dosageof0.2%super