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Carlos Eduardo Carbone, Roberto Cesar de Oliveira Romano, Maria Alba Cincotto, Rafael Giuliano Pileggi
Hardening stage evaluation of white Portland cements using oscillatory and compressive rheometry, isothermal calorimetry and the Vicat test
Appl. Rheol. 28:1 (2018) 16396 (9 pages)
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White Portland cement can be used such as decorative coatings, masonry regularization as the skin coat, and many other
applications mainly due to the ease of association with pigments to confer coloring to the applied products for aesthetic purposes.
Despite of the evaluation of the hardened stage properties to be more commonly found in literature, just a few published
works monitored the transition from fluid-to-solid stage, but this is an important step because it defines the performance of
products over time. The main purpose of this work was to compare the consolidation of different types of white Portland
cement during the hardening stage, i.e. using a combined evaluation of the chemical and physical phenomena. Isothermal
conduction calorimetry was the method used to monitor the heat release during the hydration reaction and oscillatory and
compressive rheometry were applied to monitor the changes in workability over time. The setting time, measured by Vicat
test represents the open time of each composition and was evaluated because it is affected by the physicochemical changes
of the cement. Despite the obtained results are standardized, they are empirical/arbitrary by nature. Three brands of white
Portland cements (CauêAalborg, and Tolteca) were chosen and their suspensions were prepared to achieve a constant watercement
ratio of 0.5. All suspensions presented shear thinning behavior, but different levels of yield stress and apparent viscosity.
The Tolteca cement presented the fastest heat release, which impacted the gain on consistency as measured by oscillatory
rheometry or the loss of workability as measured by the squeeze flow test. The combined evaluations, i.e. physical and chemical
results indicated that despite the fact that the changes during the hardening process had been affected: Correlations were
only observed in the physical parameters indicating that the hydration reaction promotes random changes in the microstructure
development.
► Cite this publication as follows:
Carbone CE, Romano RCdO, Cincotto MA, Pileggi RG: Hardening stage evaluation of white Portland cements using oscillatory and compressive rheometry, isothermal calorimetry and the Vicat test, Appl. Rheol. 28 (2018) 16396.
Roberto Cesar de Oliveira Romano, Marcel Hark Maciel, Rafael Giuliano Pileggi, Maria Alba Cincotto
Monitoring of hardening of Portland cement suspensions by Vicat test, oscillatory rheometry and isothermal calorimetry
Appl. Rheol. 27:3 (2017) 36006 (10 pages)
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The hardening of cement pastes occurs due to coagulation/flocculation promoted by the hydration reactions. At this way,
depending on the physico-chemical characteristics of the powder, different changes are obtained during the microstructure
formation. Thus, as the use of supplementary cementitious materials is rising worldwide, this stage of construction process
is being more complex. So, this work was conducted to evaluate the hardening phenomenon of pastes formulated with Portland
cements blended with limestone filler (LF) and ground blast furnace slag (BFS). Vicat test, oscillatory rheometry and isothermal
conduction calorimetry were used to monitor this transition. Vicat test results indicate different setting times as a function
of addition, but no information before these times was obtained. Using isothermal calorimetry was possible to monitor the
related changes to the chemical reactions since the first contact with water, and using rheometry, the rate and force of cement
particle agglomeration. During the discussion of results will be not presented in depth the results of the three methods, but
will be shown that they are complementary and provide a better explanation to the transition from fluid-to-solid behavior,
independently of kind of supplementary cementitious materials.
► Cite this publication as follows:
Romano RCdO, Maciel MH, Pileggi RG, Cincotto MA: Monitoring of hardening of Portland cement suspensions by Vicat test, oscillatory rheometry and isothermal calorimetry, Appl. Rheol. 27 (2017) 36006.
Roberto Cesar de Oliveira Romano, Caio Cesar Liberato, Marcelo Montini, Jorge Borges Gallo, Maria Alba Cincotto, Rafael Giuliano Pileggi
Evaluation of transition from fluid to elastic solid of cementitious pastes with bauxite residue using oscillation rheometry and isothermal calorimetry
Appl. Rheol. 23:2 (2013) 23830 (9 pages)
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This work evaluates the impact of using bauxite residue (BR) as filler addition in cementitious compositions, during the early
ages of transformation from the viscous fluid phase to an elastic solid. Chemical reaction and consolidation (physical phenomena
of hardening) were also correlated. The chemical reaction rate was accompanied using isothermal calorimetry and
the consolidation measured using oscillatory rheometry (quantifying the storage modulus - G' and relating with yield stress,
σ0). The results show that BR accelerates the cement hydration reaction, but in pastes with pure cement, consolidation was
faster, showing a distinct effect on the fluid-solid transition.
► Cite this publication as follows:
Romano RCdO, Liberato CC, Montini M, Gallo JB, Cincotto MA, Pileggi RG: Evaluation of transition from fluid to elastic solid of cementitious pastes with bauxite residue using oscillation rheometry and isothermal calorimetry, Appl. Rheol. 23 (2013) 23830.
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