Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Optimization of cement paste formulation for rheometric experiments.
Submission Author:
Patricia Tristão , RJ
Co-Authors:
Patricia Tristão, Eliana Marin, Paulo Roberto de Souza Mendes, Elias da Conceição Rodrigues
Presenter: Eliana Marin
doi://10.26678/ABCM.COBEM2023.COB2023-2295
Abstract
Cement pastes has a plethora of applications. The most common application is in the building industry but exist other essential applications like oil and gas industry, especially during well completion phase. Failure in cementing operations can cause accidents and production stopping with very high costs. It is one of the reasons for an advance in the study of well cementing. It is well-known that the complexity of cement is due to hydration, which changes its structure and time-dependent rheological behaviour. These conditions made this material challenging for study and advancement. Due to these conditions, there are many difficulties when cement pastes is rheologically characterized, for this reasons number of controlled and rigorous studies is minimal. Some sedimentations are expected along rheological experiments due to the high particle concentration, sliding on the geometry walls, water separation, and plug flow. This work optimizes and controls paste preparation, minimizing sedimentation at maximum as well as water separation. We have used four additives concentration and measured the percentage of free water and apparent yield stress. After testing 25 different formulations, we have decided the best composition of additives to obtain a paste with zero percentage of separated water, minimum sedimentation during 24h.The main component used was deionized water, fluid loss PVOH (49-88 S2), defoamer (Basupur DF 5), a retarder (CemR-10), being 2%, 0.2%, and 0.05%, respectively, and water/cement ratio of 44%. A Turbiscan was applied to measure the sedimentation, a probe test to determine the % free water content, and a spreading test to apparent yield stress. Finally, the paste was micrographics of this hydration process using a Scanning Electron Microscope and cryogenic process (cryo-SEM).
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