Hydration Mechanism of Magnesium Phosphate Cement Based on Thermokinetics

doi:10.11901/1005.3093.2017.236

Chinese Journal of Materials Research

2018, Vol. 32

Issue (4): 247-254 DOI: 10.11901/1005.3093.2017.236

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Hydration Mechanism of Magnesium Phosphate Cement Based on Thermokinetics

Fengle DAI^1,², Hongtao WANG¹(

), Zichao JIANG¹, Sixie ZHAO¹

1 Department of Chemistry and Engineering, Logistical Engineering University, Chongqing 401311, China
2 The 96726 Unit of PLA, Qingyuan 511500, China

Cite this article:

Fengle DAI, Hongtao WANG, Zichao JIANG, Sixie ZHAO. Hydration Mechanism of Magnesium Phosphate Cement Based on Thermokinetics. Chinese Journal of Materials Research, 2018, 32(4): 247-254.

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Abstract

The hydration heat release behavior of magnesium phosphate cement (MPC) was investigated by isothermal calorimeter. Results show that according to the feature of reaction processes, the hydration of MPC could be divided into five periods, such as the initiation, dissolution of MgO, growth of Mg(H₂O)₆²⁺, accelerating growth of MgKPO₄·6H₂O (MKP), as well as decelerating growth and stable period of MKP. Meanwhile, the activation energy of each stage was acquired by Arrhenius formula. The hydration of MPC needed to be excited by the acidic environment. With the extend of hydration time, H⁺ was consumed in the hydration system, and then the hydration system became alkaline gradually because of the slightly soluble nature and hydrolysis of MgO in water. In the early hydration stage of MPC the hydration product MKP crystallites grew and interconnected rapidly, which formed the frame of the whole structure of MPC and the compressive strength of MPC increased rapidly. After 8h of hydration, the growth rate of MKP decreased significantly, whilst the increase of compressive strength of MPC mainly depended on the integrity of interconnection of MKP crystallites.

Key words: inorganic non-metallic materials magnesium phosphate cement hydration kinetics hydration mechanism

Received: 07 April 2017

Fund: Supported by National Natural Science Foundation of China (No. 51272283) and Natural Science Foundation of Chongqing (No. cstc2012jjB50009)

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	Fengle DAI
	Hongtao WANG
	Zichao JIANG
	Sixie ZHAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.236 OR https://www.cjmr.org/EN/Y2018/V32/I4/247

Table 1 Chemical composition of the dead-burned magnesia (%, mass fraction)

Fig.1 Characteristic hydration heat release curve of MPC

Fig.2 Cumulative heat and fitting diagram of Knudsen model at 293 K (a) cumulative heat (b) fitting diagram of Knudsen model

Table 2 Kinetic parameters of stage B-F at 293 K

Fig.3 Fitting diagram of stage B-stage F at 293 K (a) stage B, (b) stage C, (c) stage D, (d) stage E, (e) stage F

Table 3 Kinetic parameters of stage B-F at 303 K and the activation energy

Fig.4 Relationship between lnK and 1/T

Fig.5 Relationship between compressive strength and curing time

Fig.6 XRD patterns at different hydration curing age

Fig.7 TG-DSC and the mass loss at different hydration curing age (a) TG curves, (b) mass loss

Fig.8 Microstructures and EDS spectra at different hydration curing age (a1) 0.5 h, (a2) EDS of 0.5 h, (b) 1 h, (c) 8 h, (d1) 3 d, (d2) EDS of 3 d, (e) 7 d, (f) 28 d

Fig.9 Varying curve of pH value

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