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密封和饱水条件下养护的水泥硬化体纳米结构

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Abstract:

采用毛细吸水的方法可重复制备压实水泥水化硬化体;测量了用以表征水泥水化程度的化学收缩;利用小角X射线散射技术获得了水化硅酸钙纳米凝胶颗粒的堆积结构分形维数;研究了不同养护条件下制备的水泥硬化体分形结构。结果表明密封养护的水泥硬化体10d龄期水化程度与饱水养护的水泥硬化体相同;而饱水养护的水泥硬化体10d龄期时其纳米凝胶结构的分形维数明显低于密封养护的水泥硬化体。同步辐射小角X射线散射技术可探测到密封养护的水泥硬化体由于水化产生的自干燥现象,以及由此引起的纳米凝胶颗粒紧密堆积,该技术为水泥基材料自收缩性能的微观机制研究提供了技术手段。

References

[1]  References:
[2]  ? POWERS T C. Structure and physical properties of hardened Portland cement paste [J]. J Am Ceram Soc, 1958, 41(1): 1–6.
[3]  ? POWERS T C, BROWNYARD T L. Studies of the physical properties of hardened Portland cement paste [J]. ACI J Proc, 1946, 43(9): 101–132.
[4]  ? FELDMAN R F, SEREDA P J. Sorption of water on compacts of bottle hydrated cement, I. Sorption and length change isotherms [J]. J Appl Chem, 1964, 14: 87–94.
[5]  ? FELDMAN R F, SEREDA P J. Sorption of water on compacts of bottle hydrated cement II. Thermodynamic considerations and theory of volume change [J]. J Appl Chem, 1964, 14: 95–104.
[6]  ? FELDMAN R F, SEREDA P J. A model for hydrated Portland cement paste as deduced from sorption–length change and mechanical properties [J]. Mater Struct, 1968, 1: 509–520.
[7]  ? LI Yongxin, CHEN Yimin, HE Xingyang, et al. Pore volume fractal dimension of fly ash–cement paste and its relationship between the pore structure and strength [J]. J Chin Ceram Soc, 2003, 31(8): 774–779.
[8]  ? GUO Wei, QIN Honggen, CHEN Huisu. Fractal theory and its applications in the study of concrete materials [J]. J Chin Ceram Soc, 2010, 38(7): 1362–1368.
[9]  ? HE Rongan, CHU Zengyong, LI Xiaodong, et al. Effect of pyrolysis temperature on micropore size distribution in silicon carbide fibers by the small angel X-ray scattering [J]. J Chin Ceram Soc, 2006, 34(12): 1470–1474.
[10]  ? YAO Wu, SHE Anming, YANG Peiqiang. 1H–NMR relaxation and state evolvement of evaporable water in cement pastes [J]. J Chin Ceram Soc, 2009, 37(10): 1602–1606.
[11]  ? JENNINGS H M. Refinements to colloid model of C–S–H in cement: CM–II [J]. Cem Concr Res, 2008, 38: 275–289.
[12]  ? ALIZADEH R, BEAUDOIN J J, RAKI L. C–S–H (I)–A nonstructural model for the removal of water from hydrated cement paste? [J]. J Am Ceram Soc, 2007, 90: 670–672.
[13]  ? JENNINGS H M, BULLARD J W, et al. Characterization and modeling of pores and surfaces in cement paste: Correlations to processing and properties [J]. J Adv Concr Technol, 2008, 6(1): 5–29.
[14]  ? JENNINGS H M. Colloid model of C–S–H and implications to the problem of creep and shrinkage [J]. Mater Struct/Concr Sci Eng, 2004, 37(1): 59–70.
[15]  ? SHEN Yeqing, DENG Min, LU Anqun. Structural evolution of hydrated cement compacts [J]. Mater Struct, 2011, 44: 1735–1743.
[16]  ? SHEN Yeqing, DENG Min. Capillary absorption of liquid by powder compact and its application on preparation of repeatable cement compacts [J]. Adv Mater Res, 2011, 163–167: 2916–2919.
[17]  ? SHEN Yeqing, DENG Min, LU Anqun. Early age microstructure of hydrating cement with ultra-low water to cement ratio investigated by synchrotron SAXS [J]. J Chin Ceram Soc, 2012, 40(5): 691–695.

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