Early Age Property Study of Phosphate Cement by Electrical Conductivity Measurement

Abstract:

The properties and electrical conductivity at early age of magnesium phosphate cement (MPC) was studied. Electrical resistivity or conductivity had been used for explaining the microstructure development of cement materials. In the current study, an electrodeless resistivity meter (ERM) was used to study the early property of MPC, which was mixed with and without fly ash respectively. The hardening process was investigated by the conductivity variation, incorporating with strength development and temperature rise during the initial reaction. The products and microstructure morphology of MPC paste were analysed by XRD and SEM. Results showed the mechanical property of MPC can be improved by fly ash. Fly ash lowers the maximum temperature rise during initial reaction of MPC with water. The electrical conductivity results divids the hardening process of MPC into three stages: acceleration, deceleration and stabilization. Conductivity measurement is an excellent method to explain the hardening process of MPC.

• Periodical: Key Engineering Materials (Volume 544)
• Pages: 409-414
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.544.409
• Online since: March 2013
• Authors: Zhu Ding, Xiao Dong Wang, Bi Qin Dong, Zongjin Li, Feng Xing
• Keywords: Early Reaction, Electrical Conductivity, Hardening, Magnesium Phosphate Cement

References

[1] S.S. Seehra, S. Gupta, S. Kumar, Rapid setting magnesium phosphate cement for quick repair of concrete pavements – characterization and durability aspects. Cem. Conc. Res. 23 (1993) 254-266.

DOI: 10.1016/0008-8846(93)90090-v

[2] Q.B. Yang, B.R. Zhu, S.Q. Zhang, X.L. Wu, Properties and applications of magnesia-phosphate cement mortar for raped repair of concrete. Cem. Conc. Res. 30 (2000) 1807-1813.

DOI: 10.1016/s0008-8846(00)00419-1

[3] A. Wagh, R. Strain, S.Y. Jeong, D. Reed, T. Krouse, D. Singh, Stabilization of Rocky Flats Pu-Contaminated Ash Within Chemically Bonded Phosphate Ceramics, J. Nucl. Mater. 265 (1999) 295-307.

DOI: 10.1016/s0022-3115(98)00650-3

[4] D. Singh, A.S. Perry, S.Y. Jeong, U. S patent 6, 204, 214. (2001).

[5] K.D. Patrick, D.A. Matthew, Durable phosphate-bonded natural fiber composite products. Cons. Buil. Mater. 24 (2010) 215-219.

[6] S.A. Abo El-Enein, M.F. Kotkata, G. B Hanna, Electrical conductivity of concrete containing silica fume. Cem. Conc. Res. 25 (1995) 1615-20.

DOI: 10.1016/0008-8846(95)00156-5

[7] B. P Hughes, A.K.O. Soleit, R.W. Brierly, New technique for determining the electrical resistivity of concrete. Magaz. Conc. Res. 37 (1985) 243-48.

[8] Z.J. Li, X.S. Wei, W.L. Li, Preliminary interpretation of Portland cement hydration process using resistivity measurements. ACI Mater. J. 100 (2003) 253-57.

DOI: 10.14359/12627

[9] Z.J. Li, L.Z. Xiao, X.S. Wei, Interpretation of microstructure development of cementitious materials in early ages with electrical resistivity measurement. Microstructure Related Durability of Cementitious Composites, 1-2. RILEM proceedings. P. 61, 253-262. (2008).

[10] L.Z. Xiao, Z.J. Li, New Understanding of cement hydration mechanism through electrical Resistivity Measurement and Microstructure Investigations. J. Mater. Civ. Eng. 21 (2009) 368-373.

DOI: 10.1061/(asce)0899-1561(2009)21:8(368)

[11] Z.J. Li, L.Z. Xiao, X.S. Wei, Determination of concrete setting time using electrical resistivity measurement. J. Mater. Civ. Eng. 19 (2007) 423-427.

DOI: 10.1061/(asce)0899-1561(2007)19:5(423)

[12] L.Z. Xiao, Z.J. Li, Early-age hydration of fresh concrete monitored by non-contact electrical resistivity measurement. Cem. Conc. Res. 38 (2008) 312-319.

DOI: 10.1016/j.cemconres.2007.09.027

[13] Z. Ding, Z.J. Li, High-Early-Strength Magnesium Phosphate Cement with Fly Ash, ACI Mater. J. 102 (2005) 375-381.

DOI: 10.14359/14799