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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.
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