Effect of CuO on the formation of clinker minerals and the hydration properties

The purposes of this study are to explore the mechanisms of Cu element in clinker burning and hydration processes and to make effective use of waste containing copper in cement production. The effect of CuO on clinker mineral composition, C 3S polymorph and size, Cu element distribution and state, c...

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Bibliographic Details
Published in:Cement and concrete research 2010-12, Vol.40 (12), p.1681-1687
Main Authors: Ma, Xian-Wei, Chen, Hu-Xing, Wang, Pei-Ming
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
C 3S
Calcium aluminum ferrite
Cement clinker
Cement concrete constituents
Cements
Clinker
COMBUSTION
Copper
COPPER OXIDE
CuO
CUPROUS OXIDE
Exact sciences and technology
FERRITE
Hydration
Materials
MINERALS
Properties of anhydrous and hydrated cement, test methods
Tricalcium silicate
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Summary:The purposes of this study are to explore the mechanisms of Cu element in clinker burning and hydration processes and to make effective use of waste containing copper in cement production. The effect of CuO on clinker mineral composition, C 3S polymorph and size, Cu element distribution and state, compressive strengths, hydration products, non-evaporable water quantity and hydration heat release rate was analyzed by XRD, SEM, DTA, isothermal heat-conduction calorimetry, etc. Results show that as the amount of CuO increases the formation and growth of C 3S grain are accelerated, R C 3S is gradually transformed into M 3 and the content of C 4AF increases; a small quantity of CuO increases the 3-day and 28-day strengths and the hydration degree of clinker, but excessive CuO has adverse effects. Those effects of CuO on clinker burning process are attributed to the formation of low-melting Cu 2O and the dissolution of CuO in C 4AF which decrease the formation temperature of liquid phase and increase its quantity. The effects on hydration process result from the combined action of the following factors: the induction period is prolonged; the hydration reactions in the initial and acceleration periods are accelerated.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2010.08.009