全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

硬化水泥浆体体积电阻和孔结构的关系

DOI: 10.7521/j.issn.0454-5648.2014.08.09

Full-Text   Cite this paper   Add to My Lib

Abstract:

用交流阻抗技术研究了硬化硅酸盐水泥浆体体积电阻和孔结构的变化特征。结果表明硬化水泥浆体的体积电阻在前7d增长迅速,7d龄期时,体积电阻已经达到了总电阻的60%~70%,水灰比对体积电阻增长率的影响也主要体现在前7d。根据硬化水泥浆体中连通孔隙和闭合孔隙的特点,提出了硬化水泥浆体固、液相的串并连模型,建立了体积电阻与水泥硬化浆体中连通孔隙和非连通孔隙的关系。基于该模型和压汞法测试的总孔隙率的计算表明当孔隙率接近20%时,闭合孔隙在总孔隙中所占的比例急速提高;当孔隙率大于25%时,连通孔隙所占的比例明显增大。

References

[1]   YOON S S, KIM H C, HILL R M. Dielectric response of hydrating porous cement paste [J]. Appl Phys, 1996, 29(3): 869-875.
[2]   HADDAD R H, AL-QADI I L. Characterization of Portland cement concrete using electromagnetic waves over the microwave frequencies [J]. Cem Concr Res,1998, 28: 1379-1391.
[3]   VAN BEEK A, HILHORST M A. Dielectric measurements to characterize the microstructural changes of young concrete [J]. Heron, 1999, 44(1): 3-17.
[4]   SCUDERI C A, MASON T O, JENNINGS H M. Impedance spectra of hydrating cement pastes [J]. J Mater Sci, 1991, 26(2): 349-353.
[5]   安晓鹏,史才军,何富强,等.三组份胶凝体系的交流阻抗特性[J].硅酸盐学报,2012.40(7): 1059-1066.
[6]  AN Xiaopeng, SHI Caijun, HE Fuqiang, et al. J Chin Ceram Soc, 2012, 40 (7): 1059-1066.
[7]   SUN Wei, ZUO Xiaobao. Numerical simulation of sulfate diffusivity in concrete under combination of mechanical loading and sulfate environments [J]. J Sustainable Cementbased Mater, 2012, 1(1): 46-55.
[8]   BAROGHEL-BOUNY V, DIERKENS M, WANG X, et al. Ageing and durability of concrete in lab and in field conditions: investigation of chloride penetration [J]. J Sustainable Cement-based Mater, 2013, 2(2): 13-19.
[9]   SIDDIQUE R, AGGARWAL P, AGGARWAL Y. Mechanical and durability properties of self-compacting concrete containing fly ash and bottom ash[J]. J Sustainable Cement-based Mater, 2012, 1(3): 67-82.
[10]   MCCARTER W J, STARRS G, CHRISP T M. Electrical conductivity diffusion and permeability of Portland cement-based mortars[J]. Cem Concr Res, 2000, 30(9): 1395-1400.
[11]   DIAZ B, FREIRE L, MERINO P,et al. Impedance spectroscopy study of saturated mortar samples[J]. Electrochim Acta, 2008, 53(25):? 7549-7555.
[12]   LIU Zheng, BEAUDOIN J J. An assessment of the relative permeability of cement systems using AC impedance techniques [J]. Cem Concr Rese, 1999, 29(7): 1085-1090.
[13]   CABEZA M, KEDDAM M, N′OVOA X R. Impedance spectroscopy to characterize the pore structure during the hardening process of Portland cement paste [J]. Electrochim Acta, 2006, 51(8-9): 1831-1841.
[14]   PRINCIGALLO A, LURAB P, VAN BREUGELB K,et al. Early development of properties in a cement paste: A numerical and experimental study [J]. Cem Concr Res, 2003, 33(7): 1013-1020.
[15]   BOUMIZ A, VERNET C, COHEN F. Mechanical properties of cement pastes and mortars at early ages: Evolution with time and degree of hydration [J]. Adv Cem Based Mater, 1996,3(3-4): 94-106.
[16]   COVERDALE R T, CHRISTENSEN B J, JENNINGS H M, et al. Interpretation of impedance spectroscopy of cement paste via computer modeling Part I: bulk conductivity and offset resistance [J]. J Mater Sci, 1995, 30(3): 712-719.
[17]   CHRISTENSEN B J. Microstructure Studies of Hydrating Portland Cement-Based Materials using Impedance Spectroscopy[D]. Chicago: Northwestern University, 1993.
[18]   PEREZ-PENA M, ROY D M BHALLA A S, et al. Dielectric properties of dandified hardened cementitious materials [J]. Cem Concr Res, 1986, 16(6): 951-965.
[19]   SNYDER K A, MARCHAN J. Effect of speciation on the apparent diffusion coefficient in nonreactive porous systems [J]. Cem Concr Res,? 2001,31 (12): 1837-1845.
[20]   HUGHES B P, SOLEIT A K O, BRIERLY R W. New technique for determining the electrical resistivity of concrete[J]. Mag Concr Res, 1985, 37 (133): 243-248.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133