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INFLUENCE OF LIMESTONE POWDER ON THE SETTING AND HYDRATION OF CEMENT PASTE IN THE FRESH STATE



Author(s): Villagrán-Zaccardi, Y. A., Falcone, D. D. and Benito, D. E.
Paper category: Conference
Book title: XIII International Conference on Durability of Building Materials and Components - XIII DBMC
Editor(s): Marco Quattrone, Vanderley M. John
Print ISBN: none
e-ISBN: 978-2-35158-149-0
Publication year: 2015
Pages: 359-366
Total Pages: 8
Language: English


Abstract: Limestone powder influences the hydration of Portland cement. Limestone particles act mainly as nucleation sites for the precipitation of hydration products, and they thus contribute to the development of the process.

In practical terms, the progress of cement hydration during the fresh state is evaluated by the setting times. Initial and final setting times are commonly associated with specific stages of the hydration process. In this sense, it may be important to note that the process of hydration can differ from static to dynamic conditions. A continuous removal of hydration products from the surface of the hydrating particles contributes to the acceleration of the process by increasing the exposure of anhydrous surfaces. Then, hydration during continuous agitation in a concrete mixer may differ from hydration during the setting test.

In this paper, influences of the limestone powder content in fresh cement paste are evaluated. Mixes were tested for setting times and hydration degree at the first hours of hydration. Results from static and dynamic conditions are presented. From the results, the effect of limestone powder on the hydration process is analyzed, with particular consideration of the differences between static and dynamic conditions in which hydration is allowed.


Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00