水玻璃模数对矿渣基胶凝材料水化特性及动力学的影响

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Abstract To improve the action mechanism of water glass on the hydration of slag-based cementitious materials (SCM), the influence of water glass modulus on the compressive strength and the hydration products of SCM was investigated by means of mechanical test, X-ray diffraction and thermogravimetric analyses. Meanwhile, the correlations between the kinetic parameters of crystallization nucleation and crystal growth (NG), phase boundary reaction (I) and diffusion (D) process of SCM and the water glass modulus were discussed using isothermal calorimetry and the Krstulovic-Dabic kinetic model. The results showed that the main hydration products of SCM were calcium (aluminum) silicate hydrate gels. The amount of hydration products decreased with the increase of water glass modulus in the range of 0.7—2.5. Under the condition of low water glass modulus (Ms=0.7), the formation of a large amounts of calcium (aluminum) silicate hydrate gels with low polymerization degree resulted in the reduction in compressive strength. Kinetic studies indicated that the hydration process of SCM conformed to the Krstulovic-Dabic kinetic model that the control process was shown as NG→I→D. The action mechanism of water glass modulus on the hydration of SCM lies in its effect on the reaction rate constants of NG, I and D processes, which decreased with the increase of water glass modulus, leading to the reduction in hydration reaction rate of SCM.

Key words： blast furnace slag water glass modulus hydration properties kinetics hydration mechanism

Published: 01 July 2020

CLC number:

X75

Fund:This work was financially supported by the National Natural Science Foundation of China (51674161), the Natural Science Foundation of Shandong Province (ZR2019BEE075) and the Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents (2019RCJJ007).

About author:: Yuewei Su is studying for a master's degree in mineral processing at Shandong University of Science and Technology after obtained his bachelor's degree in the same major and university at 2018. His major research directions are the preparation and study on properties of sea sand concrete based on alkali-activated binders and the comprehensive utilization of mineral resources ; Junxiang Wang obtained his Ph.D. degree in mineral processing from Shandong University of Science and Technology at 2017. He is currently a lecturer and postgraduate supervisor in the university. His main research directions include: study on the preparation and hydration mechanism of alkali-activated binders, the concentration and cementation backfilling of fine tailings, the preparation and mechanism research on environment-friendly agent for metal surface treatment, as well as the comprehensive utilization of mineral resources, etc. He has published more than ten journal papers that three of them were set as the first author, and applied three national invention patents and one of them were authorized. At present, he is undertaking one Natural Science Foundation of Shandong Pro-vince (ZR2019BEE075, 2019/06-2021/06) and one Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents (2019RCJJ007, 2019/06-2021/06). Meanwhile, he is participating in one National Natural Science Foundation of China (51674161, 2017/01-2020/12) and five applied scientific research projects as the key person. He won the first prize of Metallurgical Science and Technology Award of China Iron and Steel Industry Association/China Metal Society (position six, 2019).

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	SU Yuewei
	ZHANG Ning
	LYU Xianjun
	WANG Junxiang

Cite this article:

SU Yuewei,ZHANG Ning,LYU Xianjun, et al. Effects of Water Glass Modulus on the Hydration Properties and Kinetics ofSlag-based Cementitious Materials[J]. Materials Reports, 2020, 34(Z1): 271-276.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2020/V34/IZ1/271

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