第6章第2节中国的可持续发展实践

35320099湖南交通科技HUNANCOMMUNICATIONSCIENCEANDTECHNOLOGYVo.l35No.3Sep.2009:2009-06-11:(1963-),,,:1008-844X(2009)03-0058-061,2,1(1.,518026;2.,410076):结合清连一级公路高速化改造项目,通过新拌混凝土工作性的理论分析,结合实体工程探讨了路面滑模混凝土工作性尤其是坍落度对路面混凝土硬化后性能的影响,阐述了材料配合比设备施工工艺与混凝土坍落度的关系,提出了相应控制要求:路面混凝土;坍落度;硬化后性能:U416.216:B0引言3,,2,,,,,,,,,,,2,,;,,,,,,,,,,,,,,,,,,,,,,,,1新拌混凝土工作性与坍落度分析1.1T.C.Powers:,,[1-2]Glanville,Collins,andMatthews1947:,P.Hallstrom1955()=,,K.Newman1960:=,,O.J.Uzomaka1970:=,;3,:;1981[3]TassiosandNevill1973[4],,,,,,,,,,3:(Hooke),;(S.tVe-nant),,;(Newton),3,MaxwellKelvin(Voigt),[5],(Bingham),:=f+plddt(1):;f,Pa;d/dt,1/s;pl,Pas,11Bingham1,f,,0,f,T.P.Tassios1973,1,,,[4]1(Mobility)f(C,)(Fluidity)f(C,)pl,uCCC,pl(f(C,))E,u(Finishiability)u,C:f();pl;u;C;;E;u1.2,,,,,,,,,[6]59湖南交通科技35卷,3,,,1923(D.A.Abrams)(C.M.Chapman,1913),,,,300mm,200mm,100mm1.2.1坍落度试验,,,3,1/3,25,,,,20~30mm,,,,,,,,,,5~10s,,,,mm,5mm,,,,,d/dt,:ddt=f()=0ff-fplf(2):,,,=f,,,()max=f,,:max=h/2(3):,g/cm3;h:S=30-h=30-2f/(4),maxh/2,maxh/2,max=Kh,K,:S=30-fK(5),,pl,1.2.2路面混凝土坍落度要求(10mm);(10~50mm);(50~100mm);(100~120mm);(150mm);(240mm)(10~50mm),2322SL/mm/(Nsm-2)25~50200~50010~65100~600:;,250~600Ns/m2,10~30mm,33mm30~5010~3010~400~202工作性对硬化混凝土性能的影响,,603,:,,,,DBI,,,;,2~3mm,,,,,,,,,,,,,,,,22WilliamLerch[7],,[8]2.5~7.6cm,2.5~5.1cmRavina[9],,,1~2m,23cm,0.1~3.0mm,[10],,,,,,,,,,,,,,,,,3滑模混凝土坍落度与材料设备工艺的关系与控制3.1,,,,()();(),,,,,,(),,,,():W0=104.97+0.309SL+11.27CW+0.61SP(6):W0,kg/m3;SL,mm;SP,%3.2,Wirtgen1.5~2.5cm,CMIGOMA-CO2~4cm,(7),61湖南交通科技35卷M=60bhVt(7):M,m3/h;b,m;Vt,m/min,Vt1m/min;h,m;,1.2~1.5,:,;,;,3.3,,,10mm10~50mm,1.08~1.15,,,0.8~1.0m/min9000r/min,,,,,,,,,,,,,,,,,,,,,,,,,,,2~3,,,,,,,,3~8mm,;,,,,,,10~20mm4结语,,,,,;,,,,,,:[1]T.C.Powers.Studiesofworkabilityofconcrete[J].JourACI,1932(3):419.[2]T.C.Powers,E.M.Wilers.Adeviceforstudyingtheworkabilityofconcrete[Z].Proc.ASTM,1941(41):1003.[3].[Z].,1981.[4]T.P.Tassios,A.M.Neville.Reologyoffreshconcrete[C].//SomeconclusionsfromtheRILEMSeminaronFreshconcrete,Leeds,MatetConstr,1973,9(50):141-144.[5],.[M].:,1981.[6]JTGF302003,[S].[7],,.[J].,2004(3):33-37.[8]P.(),,,,.623,:[M].:,1991.[9]DanRavina,RachelShalom.PlasticShrinkageCracking[J].ACIJourna,l1968(2):282-291.[10].[J].,2002(9):63-66.(上接第48页)4100mRQIRQI4/%/%1.5725.995.033.963.51(JTJ073.22001):,,5结语,,G321(),,,,:[1]JTJ01497,[S].[2].[M].:,1998.[3]JTJ073.12001,[S].[4]JTJ073.22001,[S].[5],.[J].,2005(3).63