Hydration Kinetics and Microscopic Analysis of Calcium Oxide Expansion Clinker

Abstract:

Hydrating and calcining method combined with the kinetic equation were adopted to describe the hydration kinetics process of the laboratory-calcined CaO expansion clinker, XRD and SEM were used to test and analysis its mineral compo-sition and microstructure as well. The results show that, hydration reaction process in pure water of f-CaO contained in the CaO expansion clinker meets the Avrami isothermal crystallization kinetics model, and the hydration degree increases with temperature, with the relation between reaction rate constant and temperature conforming to Arrhenius law; the CaO expansion clinker powder contains a large number of particles in which f-CaO, CaSO₄, Ca₄Al₆O₁₂SO₄ (partly still containing calcium silicates) phases existing at the same time, by the impact of the presence of impurity phases and the difference of calcining conditions, the hydration activity of f-CaO contained in CaO expansion clinker was different from that of pure CaO and that of f-CaO wrapped in cement clinker or high-calcium fly ash.

• Periodical: Applied Mechanics and Materials (Volumes 477-478)
• Pages: 908-914
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.477-478.908
• Online since: December 2013
• Authors: Hua Li*, Jia Ping Liu, Qian Tian, Shou Zhi Zhang
• Keywords: Calcium Oxide Expansion Clinker, Hydration Kinetics, Microscopic Analysis

References

[1] Shunzeng Zhao, Baokun You, in: Cracking and seepage controlling technology of shrinkage- compensating concrete and its application, China Building Industry Press Publishing, Bejing (2010). (in Chinese).

[2] Baokun You: Expansive Agents and Expansive Concrete. (2012), pp.1-2. (in Chinese).

[3] Krstulovic R, Dabic P: Cem. Concr. Res. Forum Vol. 30(5) (2000), pp.693-698.

[4] Folliard K J: ACI Mater. J. Forum Vol. 102(1) (2005), pp.24-33.

[5] Bentz D P: J. Am. Ceram. Soc. Forum Vol. 80(1) (1997), pp.3-21.

[6] GB175-(2007).

[7] Vojtech Fried Macmillan, in: Physicochemistry, translated by Kuanhong Xue/Higher Education Press Publishing, Bejing (1984).

[8] Hua Li, Wei Sun and Jiaping Liu: Concr. Forum Vol (1) (2013), pp.1-5. (in Chinese).

[9] Young R A: The rietveld method [M]. Oxford University Press, (1993).

[10] Walenta G, Füllmann T and Gimenez M: Int. Cem. Rev. (2001), p.51–54.

[11] Xiancai Fu, Ruihua Chen, in: Physicochemistry, People's Education Press Publishing, Beijing (1981). (in Chinese).

[12] Babushkin B N, Matveyev T M, in: Thermodynamics of silicates, translated by Xincheng Pu, Jianhua Cao/China Building Industry Press Publishing, Beijing (1984).

[13] Rong Chen, Zhiyuan Chen: J. Build. Mater. Forum Vol. 3(2) (2000), pp.147-150. (in Chinese).