Study of Alternating Current Impedance of Basic Magnesium Sulfate Cement

Wen Hai Chen; Cheng You Wu; Hui Fang Zhang; Wu Yu Zhang; Bo Kun Chen; Ning Shan Jiang

doi:10.4028/www.scientific.net/MSF.896.97

Paper Titles

Influence of PCBM on the Glass Transition Temperature (T_g) of Poly(N-Vinylcarbazole)-Based Photorefractive Composite
p.62

The Effect of the Fe²⁺_B/Fe³⁺_B Ratio on Electric Conductivity and Corrosion Resistance of Anodes
p.72

The Influence of Hydrostatic Pressure and Electric Field to the Remanent Polarization of PbLa(Zr,Sn,Ti)O₃ Ceramic
p.78

Effects of MoS₂ on Tribological Properties and Mechanically Mixed Layer of Al Matrix Composites
p.83

Study of Alternating Current Impedance of Basic Magnesium Sulfate Cement
p.97

Study of Plasma Spraying Radar Absorbing Coating
p.104

Surface Micromorphology and Growth Rate Related to Supersaturation of KDP Crystals Grown at Different Temperature
p.111

First-Principle Calculation of Al₂O₃(012)/SiC(310) Interface Model
p.120

An Experimental Study for Low-Cycle Fatigue Crack Propagation of Glidcop Al-15
p.128

HomeMaterials Science ForumMaterials Science Forum Vol. 896Study of Alternating Current Impedance of Basic...

Study of Alternating Current Impedance of Basic Magnesium Sulfate Cement

Abstract:

Alternating current impedance has been used to study effects of hydration stages and molar ratio on the pore structure and hydration characters of basic magnesium sulfate cement. The alternating current impedance spectra of at early hydration almost appears as a straight line because none crystal hydration phases form. And it appears high frequency semicircle at late hydration stage because of decreasing of porosity and amount of 5Mg (OH)² ·MgSO₄·7H₂O gradually form with ages. Besides, alternating current impedance spectra differences among basic magnesium sulfate, magnesium oxysulfate and magnesium oxychloride cement have been studied. These differences indicate that additives such as citric acid may change the structure and charge characteristics of MgO hydration layer which make tends to form more 5Mg (OH)₂ ·MgSO₄·7H₂O phase in basic magnesium sulfate cement than that in magnesium oxysulfate cement. The higher pore solution resistance of BMS cement is the main factor of better steel-protection.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Materials Science Forum (Volume 896)

Pages:

97-103

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.896.97

Citation:

Cite this paper

Online since:

March 2017

Authors:

Wen Hai Chen, Cheng You Wu*, Hui Fang Zhang, Wu Yu Zhang, Bo Kun Chen, Ning Shan Jiang

Keywords:

Alternating Current Impedance, Basic Magnesium Sulfate Cement, Resistance

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

* - Corresponding Author

References

[1] C.Y. Wu, H.F. Yu, M. Dong, Effects of phosphoric acid and phosphates on magnesium oxysulfate cement, Mater. Struct., 48 (2015)907-917.

DOI: 10.1617/s11527-013-0202-6

Google Scholar

[2] Demediuk T, Cole WF, Hueber HV. Studies onmagnesium and calcium oxychlorides [J]. Aus. J. Chem. 8(1955)215–233.

DOI: 10.1071/ch9550215

Google Scholar

[3] C.A. Sorrell , L. Urwong, Phase relations in magnesium oxysulfate cements, J. Am. Chem. Soc., 63(1980) 523-526.

Google Scholar

[4] R. Tomce, C.Y. H.F. Yu, B. Yang, E.D. Robert, Structural characterization of new magnesium oxysulfate hydrate cement phase and its surface reactions with atmospheric carbon dioxide. J. Am. Chem. Soc., 96 (2013) 3609-3616.

DOI: 10.1111/jace.12556

Google Scholar

[5] Wu CY, Zhang HF, Yu HF, Preparation and properties of modified magnesium oxysulfate cement derived from waste sulfuric acid [J]. Adv. Cem. Res., 28(2016)178-188.

DOI: 10.1680/jadcr.15.00011

Google Scholar

[6] P. Gu, P. Xie and J.J. Beaudoin A.C. impedance spectroscopy II-micro structural characterization of hydrating cement-silica systems, Cem. Concr. Res. 23(1993): 359-361.

DOI: 10.1016/0008-8846(93)90147-2

Google Scholar

[7] Rietveld HM Line profiles of neutron powder-diffraction peaks for structure refinement', Acta Crystllographica 22(1967)151-151.

DOI: 10.1107/s0365110x67000234

Google Scholar