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水泥浆体中可蒸发水的~1H核磁共振弛豫特征及状态演变

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Abstract:

利用低场质子核磁共振方法研究了硬化水泥浆体中可蒸发水的横向弛豫特征及其状态演变。结果表明随着龄期的增长,可蒸发水的弛豫时间分布逐渐趋向于短弛豫时间,主峰平均弛豫时间降低,凝胶水相对含量不断增大,毛细水含量降低。由于浆体内部水化产物的填充使得孔结构细化,可蒸发水集中在小孔隙中,并主要以凝胶水的形式存在。

References

[1]  TAMTSIA B T,BEAUDOIN J J.Basic creep of hardened cement paste:A re-examination of the role of water[J].Cem Concr Res,2000,30:1467-1475. [2]BENTUR A,BERGER Jr R L,LAWRENCE F V,et al.Creep and drying shrinkage of calcium silicates pastes:Ⅲ,A hypothesis of irre-versible stains[J].Cem Concr Res,1982,9(1):35-48. [3]GALLE C.Effect of drying on cement-based materials pore structure as identified by mercury intrusion porosimetry:A comparative study between oven-,vacuum-,and freeze-drying[J].Cem Concr Res,2001,31:1467-1477. [4]COLLIER N C,SHARP J H,MILESTONE N B,et al.The influence of water removal techniques on the composition and microstructure of hardened cement pastes[J].Cem Concr Res,2008,38:737-744. [5]STRANGE J H,RAHMAN M.Characterization of porous solids by NMR[J].Phys Rev Lett,1993,71:3589-3591. [6]KORB J P.NMR and nuclear spin relaxation of cement and concrete materials[J].Curr Opin Colloid Interface Sci,2009,14:192-202. [7]SHARMA S,CASANOVA F,WACHE W,et al.Analysis of historical porous building materials by the NMR-MOUSE[J].Magn Reson Im-aging,2003,21:249-255. [8]KAREN Friedemann,FRANK Stallmach,JORG Karger.NMR diffu-sion and relaxation studies during cement hydration—A non-destructive approach for clarification of the mechanism of internal post curing of cementitious materials[J].Cem Concr Res,2006,36:817-826. [9]BROWNSTEIN K R,TARR C E.Importance of classical diffusion in NMR studies of water in biological cells[J].Phys Rev A,1979,19:2446-2453. [10]MEIBOOM S,GILL D.Modified spin-echo method for measurement of relaxation times[J].Rev Sci Instrum,1958,29:688-691. [11]BOHRIS A J,GOERKE U,MCDONALD P J.A broad line NMR and MRI study of water and water transport in portland cement pastes[J].Magn Reson Imaging,1998,16:455-461. [12]GORCE J P,MILESTONE N B.Probing the microstructure and water phases in composite cement blends[J].Cem Concr Res,2007,37:310-318.

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