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碳纤维水泥基材料的机敏特性研究

, PP. 49-53

Keywords: 碳纤维,水泥基材料,电阻率,损伤

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Abstract:

水泥基材料是一种高电阻率的惰性材料,通过掺入一定体积含量(0.2vol%~1.2vol%)的短切碳纤维,可显著提高其电导率。本文作者研究了碳纤维水泥基材料表观电导特性与其内部微观结构的关系,探讨了电阻率的变化与材料所受外部荷载的关联性。结果表明碳纤维水泥基材料具有实时诊断内部损伤的机敏性:当水泥基材料内部裂纹产生或扩展时,表现为材料电阻率上升;而当水泥基材料内部裂纹闭合时,其电阻率下降。碳纤维水泥基材料的电阻变化与所受荷载呈良好的线形关系;而不含碳纤维的普通水泥基材料在整个受荷过程中,其电导特性则无明显变化。碳纤维水泥基材料电导特性的变化反映了水泥基材料内部损伤状况丰富的信息,根据这一特性可以及时预报水泥基材料内部潜在的损伤状况,有效地防止灾难性的破坏。

References

[1]  Chen P W, Chung D D L. Carbon fiber reinforced concrete for smart structures capable of nondestructive flaw detection[J]. Smart Materials and Structures, 1993, 2(1): 22-30.
[2]  Fu X, Chung D D L. Effect of curing age on the self-monitoring behavior of carbon fiber reinforced mortar[J]. Cement and Concrete Research, 1997, 27(9): 1313-1318.
[3]  Xie P, Gu P, Beaudoin J J. Electrical percolation phenomena in cement composites containing conductive fibers[J]. Journal of Material Science, 1996, 31(5): 4093-4097.
[4]  Zallen R. The physics of amorphous solids[M]. New York: A Wiley-Interscience Publication, 1983. 135-204.
[5]  McLachlan D S, Blaszkiewicz M, Newnham R E. Electrical resistivity of composites[J]. J Amer Ceram Soc, 1990, 73(8): 2187-2203.
[6]  王秀峰,王永兰,金志浩. 碳纤维增强水泥基复合材料的电导性能及其应用[J]. 复合材料学报,1998,15(3):75-80.
[7]  McCarter W J. A parametric study of the impedance characteristics of cement-aggregate systems during early hydration[J]. Cem Concr Res, 1994, 24(6): 1097-1110.
[8]  Gu P, Xu Z, Xie P. Application of AC impedance technique in studies of porous cementatious materials[J]. Cem Concr Res, 1993, 23(3): 531-540.
[9]  Ford S J, Shane J D, Mason T O. Assignment of features in impedance spectra of the cement-paste/steel system[J]. Cem Concr Res, 1998, 28(12): 1737-1751.
[10]  史美伦,陈志源. 硬化水泥浆体孔结构的交流阻抗研究[J]. 建筑材料学报,1998,1(1): 30-35.
[11]  Ford S J, Mason T O. Monitoring the corrosion of reinforcing steel in cement-based systems using impedance spectroscopy . In: Scrivener K L, Young J F, eds. Proc Mechanisms of Chemical Degradation of Cement-Based Materials . London: E & FN Spon, 1997. 125.

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